Kubota u55 4 excavator service repair manual



KUBOTA EXCAVATOR



KiSC issued 03, 2010 A

 TO THE READER TO THE READER INFORMATION CONTENTS INFORMATION 1. SAFETY FIRST ............................................ I-1 2. SAFETY DECALS ........................................ I-4 GENERAL CONTENTS GENERAL 1. CHECKING EXCAVATOR IDENTIFICATION ........................................G-1 2. ENGINE IDENTIFICATION .........................G-2 3. GENERAL PRECAUTIONS.........................G-4 4. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING...........G-8 5. TIGHTENING TORQUES ..........................G-12 6. NEW PRODUCT FEATURE (EUROPEAN VERSION) ...........................G-17 7. NEW FEATURES OUTLINE......................G-20 8. QUALITY SPECIFICATIONS ....................G-22 9. WATER AND OIL QUANTITY ...................G-33 10. DESCRIPTION OF PARTS .......................G-34 11. MAINTENANCE CHECK LIST ..................G-41 MACHINE BODY CONTENTS SERVICING 1. FRONT OPERATING MACHINE............... 1-S1 2. SWIVEL FRAME........................................ 1-S3 3. TRACK FRAME ....................................... 1-S21 ENGINE CONTENTS GENERAL 1. ENGINE .....................................................2-G1 2. SPECIAL TOOLS ......................................2-G5 MECHANISM 1. FEATURE ................................................. 2-M1 2. ENGINE BODY ......................................... 2-M2 3. LUBRICATING SYSTEM .......................... 2-M7 4. COOLING SYSTEM ................................. 2-M8 5. FUEL SYSTEM....................................... 2-M10 SERVICING 1. TROUBLESHOOTING............................... 2-S1 2. SERVICING SPECIFICATIONS ................ 2-S4 3. TIGHTENING TORQUES ........................ 2-S10 4. CHECKING, DISASSEMBLING AND SERVICING ............................................. 2-S13 HYDRAULIC SYSTEM CONTENTS MECHANISM 1. DIAGRAM OF HYDRAULIC CIRCUIT...... 3-M1 2. HYDRAULIC DEVICE LAYOUT ............... 3-M3 3. FEATURES............................................... 3-M4 4. PUMP ....................................................... 3-M8 5. CONTROL VALVE.................................. 3-M32 6. SWIVEL MOTOR .................................... 3-M54

7. TRAVEL MOTOR.................................... 3-M60 8. HYDRAULIC CYLINDER ........................ 3-M82 9. PILOT VALVE ......................................... 3-M92 10. UNLOAD VALVE .................................. 3-M103 11. HOLDING VALVE ................................. 3-M107 12. SERVICE PORT ................................... 3-M111 SERVICING 1. PUMP......................................................... 3-S1 2. CONTROL VALVE................................... 3-S34 3. SWIVEL MOTOR ..................................... 3-S63 4. SWIVEL JOINT ........................................ 3-S77 5. TRAVEL MOTOR..................................... 3-S81 6. HYDRAULIC CYLINDER ....................... 3-S140 7. PILOT VALVE (CONTROL) ................... 3-S153 8. PILOT VALVE (TRAVEL)....................... 3-S163 9. PILOT VALVE (BLADE, SWING)........... 3-S173 10. UNLOAD VALVE ................................... 3-S184 11. THIRD LINE VALVE ASSEMBLY .......... 3-S189 12. ROUTING OF HYDRAULIC HOSES ..... 3-S191 13. BOOM HOLDING VALVE ...................... 3-S217 14. MEASURING HYDRAULIC DEVICE PERFORMANCE ................................... 3-S223 15. TROUBLESHOOTING........................... 3-S244 ELECTRICAL SYSTEM CONTENTS SERVICING 1. ELECTRONIC DEVICE LAYOUT .............. 4-S1 2. WIRING CIRCUIT ...................................... 4-S2 3. TROUBLESHOOTING (START-UP EQUIPMENT VERSION) ......................... 4-S13 4. INSPECTIONS......................................... 4-S15 5. Instrument Panel Operating Guide .......... 4-S22 6. TROUBLESHOOTING (METER PANEL EDITION) .................................... 4-S77 CABIN CONTENTS MECHANISM 1. AIR CONDITIONING SYSTEM................. 5-M1 2. WIPER .................................................... 5-M20 SERVICING 1. TROUBLESHOOTING............................... 5-S1 2. MAINTENANCE AND SERVICE RELATED SPECIFICATIO NS .............................................................. 5-S4 3. TORQUE.................................................... 5-S5 4. PRECAUTIONS WHEN REPAIRING THE REFRIGERANT SYSTEM ................. 5-S6 5. INSPECTING AND CHARGING THE REFRIGERANT SYSTEM ....................... 5-S12 6. INSPECTION AND DISASSEMBLY ........ 5-S21 7. CABIN REMOVAL AND MOUNTING ...... 5-S38 8. WINDOW WASHER ................................ 5-S40 9. LIGHTING DEVICES (CAB WORK LIGHT, INTERIOR LIGHT) ...................... 5-S43 10. REMOVAL AND INSTALLATION OF GLASS ..................................................... 5-S46 11. FRONT WINDOW.................................... 5-S49

KiSC issued 03, 2010 A

 This Workshop Manual provides service personnel with information about the mechanisms, service and maintenance of the construction machinery. This Workshop Manual is divided into 3 sections, General, Mechanisms and Service.  This section contains information such as engine and equipment ID numbers, general precautions, maintenance schedules, inspections and maintenance items and special tools.  This section describes the structure of mechanisms and explains their functions.Be sure that you fully understand this Mechanisms section prior to performing any service work, such as troubleshooting or when performing any disassembly or assembly work.  This section contains information and procedures for performing maintenance on the backhoe, such as troubleshooting, service specification tables, torque specifications, items to be inspected and adjusted, disassembly and assembly procedures, as well as precautions, maintenance standard values and usage limits.

All of the illustrations, specifications and other information in this manual were created based on the latest model at the time of publication.

Please be aware that changes to the content may be made without prior notice.

   

U48-4 U55-4

For European Union



V2607-DI-E3-BH

 

KiSC issued 03, 2010 A

TO THE READER

U48-4,U55-4, WSM

   















-2 KiSC issued 03, 2010 A

 

KiSC issued 03, 2010 A

  1. SAFETY FIRST .............................................................................................................................. I-1 2. SAFETY DECALS .......................................................................................................................... I-4

KiSC issued 03, 2010 A

INFORMATION

U48-4,U55-4, WSM

                                       RY9212007INI0001US0

 • Read all instructions and safety instructions in this manual and on your engine safety decals.

• Clean the work area and engine.

• Park the machine on a stable and level ground.

• Let the temperature of the engine decrease before you start a job.

• Stop the engine, then remove the key.

• Disconnect the battery negative cable.

• Hang a    tag in the operator station.

RY9212007INI0002US0

 • Do not do the procedures below when you start the engine.

– short across starter terminals – bypass the safety start switch • Do not make unauthorized modifications to the engine. This can cause damage and decrease the engine life.

RY9212007INI0003US0

I-1 KiSC issued 03, 2010 A

INFORMATION

U48-4,U55-4, WSM

 • Do not use the machine after you consume alcohol or medication or when you are tired.

• Put on applicable clothing and safety equipment.

• Use applicable tools only. Do not use alternative tools or parts.

• When 2 or more persons do servicing, make sure that you do it safely.

• Do not touch the hot parts or parts that turn when the engine operates.

• Do not remove the radiator cap when the engine operates, or immediately after it stops. If not, hot water can spout out from the radiator. Only remove the radiator cap when it is at a sufficiently low temperature to touch with bare hands. Slowly loosen the cap to release the pressure before you remove it fully.

• Released fluid (fuel or hydraulic oil) under pressure can cause damage to the skin and cause serious injury. Release the pressure before you disconnect hydraulic or fuel lines. Tighten all connections before you apply the pressure.

• Do not open a fuel system under high pressure.

The fluid under high pressure that stays in fuel lines can cause serious injury. Do not disconnect or repair the fuel lines, sensors, or any other components between the fuel pump and injectors on engines with a common rail fuel system under high pressure.

• Put on an applicable ear protective device (earmuffs or earplugs) to prevent injury against loud noises.

• Be careful about electric shock. The engine generates a high voltage of more than DC100 V in the ECU and is applied to the injector.

RY9212007INI0004US0

 • Fuel is very flammable and explosive under some conditions. Do not smoke or let flames or sparks in your work area.

• To prevent sparks from an accidental short circuit, always disconnect the battery negative cable first and connect it last.

• The battery gas can cause an explosion. Keep the sparks and open flame away from the top of battery, especially when you charge the battery.

• Make sure that you do not spill fuel on the engine.

RY9212007INI0005US0

I-2 KiSC issued 03, 2010 A

INFORMATION

U48-4,U55-4, WSM

 • If the engine is in operation, make sure that the area has good airflow. Do not operate the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.

RY9212007INI0006US0

 • Do not discard fluids on the ground, down the drain, into a stream, pond, or lake. Obey related environmental protection regulations when you discard oil, fuel, coolant, electrolyte and other dangerous waste.

RY9212007INI0007US0

 • Keep electrolyte away from your eyes, hands and clothing. Sulfuric acid in battery electrolyte is poisonous and it can burn your skin and clothing and cause blindness. If you spill electrolyte on yourself, clean yourself with water, and get medical aid immediately.

RY9212007INI0008US0

 • Keep a first aid kit and fire extinguisher ready at all times.

• Keep emergency numbers for doctors, ambulance service, hospital and fire department near your telephone at all times.

RY9212007INI0009US0

I-3 KiSC issued 03, 2010 A

INFORMATION

U48-4,U55-4, WSM

     RY9212007INI0010US0



(1) Part No. TA040-49580 - Do not touch hot parts such as exhaust etc.

(2) Part No. RC418-57370 - Keep away from fan and fan belt.

(3) Part No. RA028-57240 - Attention to the danger of burning.

RY9212007INI0011US0

I-4 KiSC issued 03, 2010 A

INFORMATION

U48-4,U55-4, WSM

(1) Part No. (2) Part No. (3) Part No. (4) Part No. (5) Part No.

RD809-57450 - Do not touch hot parts such as exhaust etc.

RD809-57250 - Do not allow any persons within the working range.

T1060-30090 - Keep sparks, flame, cigarettes away.

TD179-30130 - Battery recycle label RD359-57840 - Battery cut switch label RY9212007INI0012US0

I-5 KiSC issued 03, 2010 A

INFORMATION

U48-4,U55-4, WSM

(1) Part No. RD809-57390 - When using a wider or deeper bucket, take good care when swinging or pulling in the front attachments to make sure that the bucket does not hit the cab.

(2) Part No. RB419-57930 - Label front door lock (3) Part No. RD809-57430 - Fasten the seatbelt.

(4) Part No. 69198-57840 - Label manual (5) Part No. RA228-93380 - Anti-theft system (6) Part No. RD809-57140 - Emergency exit RY9212052INI0001US0

I-6 KiSC issued 03, 2010 A

INFORMATION

U48-4,U55-4, WSM

(1) Part No. RD809-57950 - For information about loosening the crawler, consult the operating instructions.

(2) Part No. RC108-57960 - Attachment point for lifting gear.

(3) Part No. RD809-57250 - Do not enter the manoeuvring area.

(4) Part No. RB419-57960 - Not an attachment point for lifting gear!

(5) Part No. RD451-57480 - Diesel fuel only, no open fire.

(6) Part No. RA809-57330 - Use the attachment point only for clamping the excavator securely to a transport vehicle.

(7) Part No. RD359-57260 - Fuel supply label RY9212052INI0002US0

I-7 KiSC issued 03, 2010 A

INFORMATION

U48-4,U55-4, WSM

 1.

2.

3.

4.

Keep danger, warning and caution labels clean and free from obstructing material.

Clean danger, warning and caution labels with soap and water, dry with a soft cloth.

Replace damaged or missing danger, warning and caution labels with new labels from your KUBOTA dealer.

If a component with danger, warning and caution label(s) affixed is replace with new part, make sure new label(s) is (are) attached in the same locations(s) as the replace component.

5. Mount new danger, warning and caution labels by applying on a clean dry surface and pressure any bubbles to outside edge.

RY9212007INI0015US0

I-8 KiSC issued 03, 2010 A

 

KiSC issued 03, 2010 A

  1. CHECKING EXCAVATOR IDENTIFICATION .............................................................................. G-1 2. ENGINE IDENTIFICATION .......................................................................................................... G-2 [1] MODEL NAME AND SERIAL NUMBER ................................................................................ G-2 [2] E3B ENGINE .......................................................................................................................... G-3 [3] CYLINDER NUMBER ............................................................................................................. G-3 3. GENERAL PRECAUTIONS.......................................................................................................... G-4 4. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING .................................... G-8 [1] WIRING .................................................................................................................................. G-8 [2] FUSES.................................................................................................................................. G-10 [3] CONNECTOR ...................................................................................................................... G-10 [4] WASHING THE EXCAVATOR WITH A HIGH-PRESSURE WASHER................................ G-11 5. TIGHTENING TORQUES........................................................................................................... G-12 [1] GENERAL USE SCREWS, BOLTS AND NUTS .................................................................. G-12 [2] STUD BOLTS ....................................................................................................................... G-12 [3] TORQUE FOR HYDRAULIC HOSE FITTINGS ................................................................... G-13 (1) Torque for Hydraulic Hose Fittings ................................................................................. G-13 (2) Torques of Lock-Nuts for Elbows with Male Seats and Adaptors with O-rings (Straight Threads)........................................................................................................... G-14 (3) Torque for Tapering Adaptors ........................................................................................ G-14 [4] HOSE CLAMP SCREW TORQUE ....................................................................................... G-15 6. NEW PRODUCT FEATURE (EUROPEAN VERSION) .............................................................. G-17 7. NEW FEATURES OUTLINE....................................................................................................... G-20 8. QUALITY SPECIFICATIONS ..................................................................................................... G-22 9. WATER AND OIL QUANTITY .................................................................................................... G-33 10. DESCRIPTION OF PARTS ........................................................................................................ G-34 [1] BUCKET ............................................................................................................................... G-34 (1) Bucket dimensions ......................................................................................................... G-34 (2) Bucket installation relevant dimensions.......................................................................... G-35 [2] RUBBER CRAWLER............................................................................................................ G-36 [3] STEEL CRAWLER ............................................................................................................... G-36 [4] TRUCK ROLLER, IDLER, SPROCKET ............................................................................... G-37 [5] CYLINDER .......................................................................................................................... G-38 [6] PARTS WEIGHT .................................................................................................................. G-39 11. MAINTENANCE CHECK LIST ................................................................................................... G-41

KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  When consulting with your local KUBOTA dealer about this mini-excavator, please provide the model of the mini-excavator, its frame and engine numbers and the number of hours on the hour meter.

(1) Mini-excavator Nameplate (Model, frame number, engine number) (2) Frame Number (3) Engine Number

 

RY9212032GEG0003US0

G-1 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

    Be sure to check the engine nameplate and serial number when you wish to consult about the engine.

The model and serial number of the engine need to be checked prior to servicing the engine or replacing any of its parts.  The engine serial number is the numerical ID of the engine and is printed after the engine's model number.

The year and month of manufacture are indicated as follows   



 



1

2001

F

2015

2

2002

G

2016

3

2003

H

2017

4

2004

J

2018

5

2005

K

2019

6

2006

L

2020

7

2007

M

2021

8

2008

N

2022

9

2009

P

2023

A

2010

R

2024

B

2011

S

2025

C

2012

T

2026

D

2013

V

2027

E

2014

*The letters , , ,  and  are not used.  



January

A0001 to A9999

B0001 to BZ999

February

C0001 to C9999

D0001 to DZ999

March

E0001 to E9999

F0001 to FZ999

April

G0001 to G9999

H0001 to HZ999

May

J0001 to J9999

K0001 to KZ999

June

L0001 to L9999

M0001 to MZ999

July

N0001 to N9999

P0001 to PZ999

August

Q0001 to Q9999

R0001 to RZ999

September

S0001 to S9999

T0001 to TZ999

October

U0001 to U9999

V0001 to VZ999

November

W0001 to W9999

X0001 to XZ999

December

Y0001 to Y9999

Z0001 to ZZ999

*The letter  and  are not used. (a)

(b)(c) (d)

e.g. V2607 - 8 H A001 (a) (b) (c) (d)

Engine Model :  Year Manufactured : The  indicates .

Month : April is indicated by either  or .

Lot Number : (Either  or )

(1) Engine Model and Serial Number RY9212001END0009US0

G-2 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  [Ex. : Engine Model V2607-DI-E3B-XXXX] While the exhaust emissions regulations in each country that have been implemented to date to prevent air pollution are constantly changing, regulations governing off-road exhaust emissions are expected to be implemented more quickly. The date that specific off-road exhaust emissions regulations will take effect depends on the output category of the engine.

For some years now KUBOTA has been supplying regulation-compliant diesel engines in countries where off-road exhaust emission regulations have been introduced. KUBOTA's E3B series of engines meet the next phase of exhaust emission regulations. (See the table below.)

Whenever repairs or service is performed on a ###-E3B series engine, E3B engine replacements parts, which are in the applicable E3B KUBOTA Parts List, must be used and the KUBOTA Operator's Manual and E3B Workshop Manual must be used for maintenance. Use of incorrect replacement parts or replacement parts from other emission level engines (for example : E2B engines), may result in emission levels out of compliance with the original E3B design, EPA and/or other applicable regulations. Check the output category and emissions data on the emissions label on the header cover of the engine. E3B engines have the suffix ET after the model name on the EPA label. E3B is not marked on the engine. 





K

19 to/not including 37 kW

STAGE IIIA

J

37 to/not including 75 kW

STAGE IIIA

I

75 to/not including 130 kW

STAGE IIIA



ET





Less than 19 kW

Tier 4

19 to/not including 56 kW

Interim Tier 4

56 to/not including 75 kW

Tier 3

75 to/not including 130 kW

Tier 3

(1) EU Regulation engine output classification (2) "E3B engines" have the suffix ET after the model name on the EPA label.

"E3B" models meet Tier 3, Interim Tier4 or Tier4 regulations, depending on the engine output category.

RY9212001END0010US0

  KUBOTA diesel engines are numbered as indicated in the figure.

Cylinders are numbered from the front cover (fan side) in the order 1, 2, 3 and 4.

RY9212001END0011US0

G-3 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  Whenever performing maintenance on the mini-excavator, always read the Safety Precautions in this manual and the Operator's Manual carefully, become familiar with them and perform the work safely.

Before performing any maintenance on the mini-excavator, make sure it is sufficiently clean and choose a sufficiently clean location to perform any disassembly.

Before performing maintenance on the mini-excavator, always disconnect the negative battery cable first.

Whenever a special tool is required, use the special tool that KUBOTA recommends. Make any special tools that are not used very frequently according to the diagrams in this manual.

Always use genuine KUBOTA parts to maintain the performance and safety characteristics of the mini-excavator.

RY9212001GEG0011US0

 • Wrap plumber's tape on the threads before tightening taper couplings. After wrapping (2 wraps) the plumber's tape, tighten to the specified torque. Once the coupling is tightened, do not loosen it as this will cause an oil leak.

(1) Plumber's Tape (2) External Thread (3) Internal Thread

(4) Gap (5) Leave 1 to 2 threads RY9212001GEG0012US0

 • Clean the groove the O-ring goes in and remove any burrs.

Apply grease on the O-ring when inserting it in the groove.

(Except floating seals) • When putting the O-ring in the groove, be careful as it is easy at the very end to twist the O-ring against the inside of the groove.

If it gets twisted, roll it gently with your fingertip to untwist it.

(1) O-ring Groove (2) O-ring (3) Check for burrs

(4) If the ring touches this corner, it will twist RY9212001GEG0013US0

 • Do not face the lip of the oil seal in the wrong direction. Face the main lip toward the material to be sealed.

• After oil seals are replaced, apply grease to the moving parts around the lip to prevent the dry surfaces from wearing against each other when the engine is started. If the seal has a dust lip, fill the gap between the lips with grease.

• As a general rule, use a press to insert the oil seal in place. If that is not possible, use an appropriate tool to gently and evenly tap it into place, taking care that it does not go in at a slant.

Press the seal all the way so it seats in the boss.

(1) (2) (3) (4) (5) (6)

Gasket Metal Ring Spring Main Lip Grease Dust Lip

   

RY9212001GEG0014US0

G-4 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

 • Be sure to wipe off any oil from the O-ring or surfaces that touch the O-ring. (For wheel motors, apply a light film) • When putting an O-ring into a floating seal, make sure the O-ring does not twist.

• Apply a light film of oil to surrounding surfaces when working to get the floating seal with O-ring in place; take care that the surrounding surfaces, O-ring and housing are parallel with each other.

• After getting the seal in place, turn the engine over 2 or 3 revolutions, to both create a film of oil on surrounding surfaces and to properly seat the face of the seal.

(1) Surrounding Surfaces

(2) O-ring RY9212001GEG0015US0

 • When installing external or internal snap rings, orient them as shown in the diagram so the angled side faces the direction of force.

(1) Position so the angled part receives   the force   RY9212001GEG0016US0

 • When driving a spring pin, face the split in the direction that receives the force, as shown in the diagram.

(1) With lateral movement

(2) With rotational movement RY9212001GEG0017US0

 • Clean and dry the area where Locktite will be applied with a solvent so it is free of moisture, oil and dirt.

• Apply locktite all around the threads of the bolt except the first set of threads at the tip and fill the grooves between the threads.

If the threads or the grooves are large, adjust the amount of locktite accordingly and apply it all around the bolt hole as well.     

     

RY9212001GEG0018US0

G-5 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

 • Tighten bolts and nuts to their specified torque.

• Tighten nuts and bolts alternately top/bottom , left/right so the torque is distributed evenly.    

 

RY9212001GEG0019US0

 • Tighten to their specified torque.

• Before assembling, wipe the inside of metal fittings clean of any dirt.

• After assembly, put the fitting under normal pressure and check that it does not leak.

RY9212001GEG0020US0

 When assembling an elbow with male seat, adhere to the following procedures to prevent deformation of O-rings and leaks.

1. Connecting to Valves • Clean the blow with male seat and the surface of the seal opposite and mount with the lock-nut on top.

• Finger tighten till it touches the washer.

2. Positioning • Turn the mouth of the elbow back so it faces the right direction. (not back over 1 turn)

3. Fasten • Tighten the lock-nut to the specified torque with a wrench.

(1) Lock-nut (2) Washer (3) Seal (O-ring)

(4) Wrench for holding (5) Hose (6) Torque wrench for tightening RY9212001GEG0021US0

G-6 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

 • To remove a quick hose coupling, push the fitting (2) in the direction of the arrow and pull on the plastic part (1) in the opposite direction.

• To attach a quick coupler, push it in firmly in the direction of the arrow. Then check that it will not pull off.

(1) Plastic part

(2) Fitting RY9212001GEG0022US0

G-7 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

   Follow the precautions below for handling electrical parts and wiring to ensure safety and prevent damage to the mini-excavator and nearby equipment.                        (1) Battery Cable (-) Side

(2) Battery Cable (+) Side RY9212001GEG0023US0

  • Tighten wiring terminals securely.

(1) Correct (Tightened securely)

(2) Incorrect (Poor contact if loose) RY9212001GEG0024US0

• Keep wiring away from hazards.

(1) Hazardous Positioning (2) Wiring Position (wrong)

(3) Wiring Position (right) (4) Hazardous Position RY9212001GEG0025US0

• Immediately repair or replace old or damaged wiring.

(1) Damaged (2) Torn

(3) Electrical Tape RY9212001GEG0026US0

G-8 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

• Insert grommet securely.

(1) Grommet

   

RY9212001GEG0027US0

• Clamp wiring securely but do not damage wires with the clamp.

(1) Clamp (Spiral clamp around wire) (2) Wire

(3) Clamp (4) Welding Mark RY9212001GEG0028US0

• Clamp wiring so it is not twisted, pulled too tight or sag too much. However, moving parts may require play in the wiring.

(1) Wire (2) Clamp

   

RY9212001GEG0029US0

• Do not pinch or bind wiring when installing parts.

(1) Wire

 

RY9212001GEG0030US0

• After wiring, double-check terminal protectors and clamps before connecting battery cables.

(1) Cover (Install covers securely) RY9212001GEG0031US0

G-9 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  • Always use fuses of the specified capacity.

Never use over or undersized fuses.

• Never use copper or steel wire in place of a fuse.

• Do not install accessories such as work lights, radios, etc., if your mini-excavator does not have an auxiliary circuit.

• Do not install accessories as they will exceed the capacity of fuses.

(1) Fuse (2) Fusible Link

(3) Slow-blow Fuse RY9212001GEG0032US0

  • Press the lock to disconnect locking connectors.  

RY9212001GEG0033US0

• Hold the connectors when separating them.

• Do not pull on the wire harness to separate the connectors.  

 

RY9212001GEG0034US0

• Straighten bent prongs and make sure none are sticking out or missing.

• Remove corrosion from terminals with sandpaper.

(1) Missing terminal (2) Bent Prong

(3) Sandpaper (4) Corrosion RY9212001GEG0035US0

• Female connectors must not be spread too far open  

 

RY9212001GEG0036US0

G-10 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

• The plastic covers of connectors must cover them completely.

(1) Cover

   

RY9212001GEG0037US0

   Using a high-pressure washer incorrectly can lead to personal injury and/or damage, break or cause parts of the mini-excavator to fail, so use the power washer properly according to its user's manual and labels.                                    (1) Do not blast with water (2) Never wash from too close

   

   

RY9212001GEG0038US0

G-11 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

      









 









  



7.9 to 9.3

0.80 to 0.95

5.8 to 6.8



18 to 20

1.8 to 2.1

13 to 15



40 to 45

29 to 33

63 to 72 108 to 125 167 to 191

4.0 to 4.6 6.4 to 7.4 11.0 to 12.8 17.0 to 19.5

47 to 53 79.6 to 92.5 123 to 141



246 to 284

25.0 to 29.0



334 to 392

34.0 to 40.0













  

  

  

  

7.9 to 8.8

0.80 to 0.90

5.8 to 6.5

9.81 to 11.2

1.00 to 1.15

7.24 to 8.31

7.9 to 8.8

0.80 to 0.90

5.8 to 6.5

12.3 to 14.2

1.25 to 1.45

9.05 to 10.4

17 to 19 32 to 34

1.7 to 2.0 3.2 to 3.5

13 to 14 24 to 25

24 to 27 48 to 55

2.4 to 2.8

18 to 20

18 to 20

1.8 to 2.1

13 to 15

30 to 34

3.0 to 3.5

22 to 25

4.9 to 5.7

36 to 41

40 to 44

4.0 to 4.5

29 to 32

61 to 70

6.2 to 7.2

45 to 52

–

–

–

47 to 53

–

–

–

–

103 to 117 167 to 196

10.5 to 12.0 17.0 to 20.0

76.0 to 86.7 123 to 144

–

–

–

58 to 66 91.2 to 108 145 to 166

6.4 to 7.4

–

7.9 to 9.2 12.6 to 15.0 20.0 to 23.0

63 to 72

–

78 to 90 124 to 147 197 to 225

–

–

–

260 to 304

26.5 to 31.0

192 to 224

181 to 209

–

–

–

275 to 318

28.0 to 32.5

203 to 235

–

–

–

344 to 402

35.0 to 41.0

254 to 296

246 to 289

–

–

–

368 to 431

37.5 to 44.0

272 to 318

–

–

–

491 to 568

50.0 to 58.0

362 to 419

RY9212032GEG0001US0

  







  

  



12 to 15

1.2 to 1.6

8.7 to 11

8.9 to 11

0.90 to 1.2

6.5 to 8.6



25 to 31

2.5 to 3.2

18 to 23

20 to 25

2.0 to 2.6

15 to 18



30 to 49

3.0 to 5.0

22 to 36

31

3.2

23



62 to 73

6.3 to 7.5

46 to 54

–

–

–



98.1 to 112

10.0 to 11.5

72.4 to 83.1

–

–

–



172 to 201

17.5 to 20.5

127 to 148

–

–

– RY9212032GEG0002US0

G-12 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

    

Torque

1/8

7.8 to 11.8 N·m 0.8 to 1.2 kgf·m 5.7 to 8.7 lbf·ft

1/4

24.5 to 29.2 N·m 2.5 to 3.0 kgf·m 18.1 to 21.7 lbf·ft

3/8

37.2 to 42.1 N·m 3.8 to 4.3 kgf·m 27.5 to 31.1 lbf·ft

1/2

58.8 to 63.7 N·m 6.0 to 6.5 kgf·m 43.4 to 47.0 lbf·ft

3/4

117.6 to 127.4 N·m 12.0 to 13.0 kgf·m 86.8 to 94.0 lbf·ft

1

181.3 to 191.1 N·m 18.5 to 19.5 kgf·m 133.8 to 141.0 lbf·ft

1-1/4

220.5 to 230.3 N·m 22.5 to 23.5 kgf·m 162.8 to 170.0 lbf·ft

(1) Union Nuts RY9212001GEG0041US0



Torque

1/8

19.6 to 29.4 N·m 2.0 to 3.0 kgf·m 14.5 to 21.7 lbf·ft

1/4

36.6 to 44.1 N·m 3.7 to 4.5 kgf·m 26.8 to 32.5 lbf·ft

3/8

68.6 to 73.5 N·m 7.0 to 7.5 kgf·m 50.6 to 54.2 lbf·ft

1/2

83.4 to 88.3 N·m 8.5 to 9.0 kgf·m 61.5 to 65.1 lbf·ft

3/4

166.6 to 181.3 N·m 17.0 to 18.5 kgf·m 123.0 to 133.8 lbf·ft

(1) Taper RY9212001GEG0042US0

G-13 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

   1/8

15.0 to 16.5 N·m 1.5 to 1.7 kgf·m 11.1 to 12.2 lbf·ft

1/4

24.5 to 29.4 N·m 2.5 to 3.0 kgf·m 18.1 to 21.7 lbf·ft

3/8

49.0 to 53.9 N·m 5.0 to 5.5 kgf·m 36.1 to 39.8 lbf·ft

1/2

58.8 to 63.7 N·m 6.0 to 6.5 kgf·m 43.4 to 47.0 lbf·ft

Torque

3/4, 1

117.6 to 127.4 N·m 12.0 to 13.0 kgf·m 86.8 to 94.0 lbf·ft

1-1/4

220.5 to 230.3 N·m 22.5 to 23.5 kgf·m 162.8 to 170.0 lbf·ft

(1) Lock-nut (2) Washer

(3) Seal (O-ring) RY9212001GEG0043US0

 

Torque

1/8

19.6 to 29.4 N·m 2.0 to 3.0 kgf·m 14.5 to 21.7 lbf·ft

1/4

36.6 to 44.1 N·m 3.7 to 4.5 kgf·m 26.8 to 32.5 lbf·ft

3/8

68.6 to 73.5 N·m 7.0 to 7.5 kgf·m 50.6 to 54.2 lbf·ft

1/2

83.4 to 88.3 N·m 8.5 to 9.0 kgf·m 61.5 to 65.1 lbf·ft

3/4

166.6 to 181.3 N·m 17.0 to 18.5 kgf·m 123.0 to 133.8 lbf·ft

(1) Taper RY9212001GEG0044US0

G-14 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

   10-

14

6C040-58721

2.5 to 3.4 N·m 25 to 35 kgf·cm 1.8 to 2.5 lbf·ft

12-

16

09318-89016

2.5 to 3.4 N·m 25 to 35 kgf·cm 1.8 to 2.5 lbf·ft

19-

25

09318-89024

2.5 to 3.4 N·m 25 to 35 kgf·cm 1.8 to 2.5 lbf·ft

31-

40

09318-89039

2.5 to 3.4 N·m 25 to 35 kgf·cm 1.8 to 2.5 lbf·ft

36-

46

09318-89045

2.5 to 3.4 N·m 25 to 35 kgf·cm 1.8 to 2.5 lbf·ft

44-

53

09318-89052

3.9 to 4.9 N·m 40 to 50 kgf·cm 2.9 to 3.6 lbf·ft

51-

59

09318-89058

3.9 to 4.9 N·m 40 to 50 kgf·cm 2.9 to 3.6 lbf·ft

86-

96

RD809-42241

3.9 to 4.9 N·m 40 to 50 kgf·cm 2.9 to 3.6 lbf·ft

Torque

RY9212001GEG0045US0

G-15 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

 13-

20

RB101-63631

2.5 to 3.4 N·m 25 to 35 kgf·cm 1.8 to 2.5 lbf·ft

15-

25

RC101-64581

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

19-

28

R1401-63211

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

22-

32

R1401-63151

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

26-

38

68311-72821

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

32-

44

RD411-63821

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

44-

56

35820-15181

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

50-

65

RC401-63191

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

58-

75

36919-04591

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

60-

80

RD809-63101

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

68-

85

RD809-63061

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

77-

95

69284-63171

4.9 to 5.9 N·m 50 to 60 kgf·cm 3.6 to 4.3 lbf·ft

Torque

RY9212001GEG0046US0

G-16 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  

Basic specification

Operation

(1)

Robust Machine Weight (Machine class upgraded to 5.5 ton)

(2)

V2607 New DI Engine

(3)

Advanced Three Pump Load Sensing System *

(14)

Sheet-metal processed covers

(4)

Strong bucket breakout force

(15)

One side engine maintenance

(16)

Bush with flange at arm tip end

(17)

Prolonged return filter life 500 hours 1000 hours

(13)

Pilot hydraulic remote-control system for all actuators

Serviceability

Performance (5)

Bigger Lifting Capacity

(6)

Dual Speed with Auto-shift as standard (Bigger travel force)

Safety

(7)

Higher Blade

(18)

(8)

Shortened distance between blade and bucket teeth

Others

Operator comfort

Travel parking brake as standard

(19)

KUBOTA original digital panel at the Front *

(9)

Spacious and comfort cabin

(20)

Leading-edge Anti-theft system for greater security

(10)

Powerful Air conditioning

(21)

Battery Isolator *

Versatility (11)

AUX1" and "AUX2" with proportional control on joystick is adopted. *

(12)

The maximum oil flow of both AUX lines can be adjusted by digital panel. *

* : New Feature RY9212052GEG0001US0

G-17 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  • Engine start safety system on the left console • Travel motor with disc brake • Swivel motor with disc brake • Overload warning buzzer • KUBOTA original anti-theft system • Anti-drop valve on the boom (ISO8643)  • Auxiliary hydraulic circuits (SP1 and SP2*) piping to the arm end *for Types L and M. • 2 working lights on cabin and 1 light on the boom • 1450 mm arm length (U48-4) • 1570 mm arm length (U55-4)  • ROPS (Roll-over Protective Structure, ISO3471) • OPG (Operating Protective Guard) Level1 • Wight-adjustable full suspension seat • Seatbelt • Hydraulic pilot control levers with wrist rests • Travel levers with foot pedals • Air conditioning (Type L) • Cabin heater for defrosting and demising • Emergency exit hammer • Front window power assisted with gas damper • 12 V power source • 2 speakers and radio aerial • Location for radio • Back mirror (left, right and rear) • Cup holder  • Double-element air filter • Electric fuel injection pump system • Auto idling system  • 400 mm rubber track • 1 x upper track roller • 5 double-flange track rollers on each track • 2-speed travel switch on blade lever • Two-speed travel with auto-shift • Water separator with drain cock  • Pressure accumulator • Hydraulic pressure checking ports • Straight travel circuit • Third line hydraulic return • Load-sensing hydraulic system • Adjustable maximum oil flow on auxiliary circuits (SP1 and SP2) *For (Type L and M) • Double auxiliary circuit accessories • Auxiliary switch (SP1) on right control lever • Auxiliary switch (SP2) on left control lever (Type L and M) RY9212052GEG0002US0

G-18 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  • 400 mm steel track (+ 100 kg) • 550 mm steel track (+ 300 kg)  • Anti-drop valve unit (arm and blade) • Bracket and harness for beacon light  • Special paint upon request RY9212007GEG0003US0

 

 

 

/

 

–

/



–

/– RY9212052GEG0003US0

G-19 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

    1. Large LCD display 2. Display and anti-theft controllers are unified into 1 ECU. 3. Main display and ECU are independent items connected by CAN (Controller Area Network) technology.

(1) GENERAL (2) MAIN DISPLAY METER PANAL *CONTROL ECU *AUTO IDLE   *ANTI-THEFT *AUTO SHIFT TRAVELING SPEED RY9212007GEG0005US0

  The hydraulic control grip has proportional Flow Control built in.

Signals from this sensor activate the proportional solenoid valve to control the flow rate at the hydraulic service port.

(1) Control knob (Auxiliary circuit) RY9212007GEG0006US0

 (1) Battery cut switch

   

RY9212007GEG0007US0

G-20 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  All actuators are hydraulically locked when the unlock lever is raised. (travel, swing, blade and AUX are also hydraulically controlled.)

It realizes smoother movement with fine inching control.  • U55-4 adopts the same 3-pump load sensing system as KX057-4.

• 1st and 2nd pumps that normally supply the oil to front attachments change the oil flow to travel actuator when travelling in order to realize the strong travel performance.

• The travel slow down while operating front attachments is minimized by adopting 3-pump load sensing system (ex. when blading and travelling.

(1) Travel (R), Travel (L) (2) Boom, Arm, Bucket, AUX1, Swivel (3) AUX2, Blade, Swing

   

RY9212052GEG0004US0

G-21 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  Machine specification : Auxiliary port1, Wrist rest, Cab, Japan STD-bucket [125 kg (277 lbs) with 2 pins 7 kg (15.5 lbs)]   

  • Total length (Transport)

5330 ± 107 mm 209.8 ± 4.2 in.

5500 ± 110 mm 216.5 ± 4.3 in.

• Total width

1960 ± 20 mm 77.2 ± 0.8 in.

1960 ± 20 mm 77.2 ± 0.8 in.

• Total height

2550 ± 25 mm 100.4 ± 1.0 in.

2550 ± 25 mm 100.4 ± 1.0 in.

–

–

46.8 ± 2 kN 4775 ± 235 kg 10527 ± 517 lbs

53.0 ± 3 kN 5400 ± 270 kg 11905 ± 594 lbs

L

9.0 ± 0.9 rpm

9.3 ± 0.9 rpm

R

9.0 ± 0.9 rpm

9.3 ± 0.9 rpm

Rubber F1

2.8 ± 0.3 km/h 1.74 ± 0.2 mph

2.8 ± 0.3 km/h 1.74 ± 0.2 mph

Rubber F2

4.9 ± 0.5 km/h 3.04 ± 0.3 mph

4.9 ± 0.5 km/h 3.04 ± 0.3 mph

Steel F1

2.6 ± 0.3 km/h 1.62 ± 0.2 mph

2.6 ± 0.3 km/h 1.62 ± 0.2 mph

Steel F2

4.6 ± 0.5 km/h 2.86 ± 0.3 mph

4.6 ± 0.5 km/h 2.86 ± 0.3 mph

30 ° <

30 ° <

 • Machine weight (Operating weight)

ROPS CAB

 • Swivel speed

• Travel speed

• Gradeability

F1

Rear end min. tuming radius Swivel frame rear ground clearance Tumbler center distance Crawler total length Crawler total width Min. ground clearance

990 ± 20 mm 1045 ± 21 mm 39.0 ± 0.8 in.

41.1 ± 0.8 in.

624.5 ± 12.5 mm 629 ± 12.6 mm 24.6 ± 0.5 in.

24.8 ± 0.5 in.

1990 ± 60 mm 78.3 ± 2.4 in.

2500 ± 75 mm 98.4 ± 3.0 in.

1960 ± 39 mm 77.2 ± 1.5 in.

310 ± 9 mm 12.2 ± 0.4 in.



Fuel tank : Full Truck : Rubber, Japan STD Bucket [Including operator's weight 75 kg (170 lbs)]

Front horizontal bucket crowd with no load Engine Max. speed Oil temp. : 50 ± 5 °C (122 ± 9 °F) Traveling stance : Engine Max. speed Oil temp. : 50 ± 5 °C (122 ± 9 °F)

Hill-climbing stance, E/G Max speed

Including bottom plate

G-22 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  

  • Bucket heaped capacity



0.16 ± 0.006 m3 0.2 ± 0.008 yd3

0.16 ± 0.006 m3 0.2 ± 0.008 yd3

0.11 ± 0.004 m3 0.1 ± 0.006 yd3

0.12 ± 0.005 m3 0.2 ± 0.006 yd3

550 ± 11 mm 21.7 ± 0.4 in.

600 ± 12 mm 23.6 ± 0.5 in.

CAB L

71 ± 2 °

71 ± 2 °

CAB R

54 ± 2 °

54 ± 2 °

• Max. digging radius

5850 ± 88 mm 230.3 ± 3 in.

6105 ± 92 mm 240.4 ± 4 in.

0 ° swing

• Ground level Max. digging radius

5710 ± 86 mm 224.8 ± 3 in.

5960 ± 89 mm 234.6 ± 4 in.

0 ° swing

• Ground level Min. finish radius

1975 ± 40 mm 77.8 ± 2 in.

2045 ± 41 mm 80.5 ± 2 in.

0 ° swing Bucket bottom horizontal

• Max. digging depth

3380 ± 68 mm 133.1 ± 3 in.

3630 ± 73 mm 142.9 ± 3 in.

• Max. vertical digging depth

2670 ± 80 mm 105.1 ± 3 in.

2830 ± 85 mm 111.4 ± 3 in.

–

–

5440 ± 109 mm 214.2 ± 4 in

5665 ± 113 mm 223.0 ± 4 in.

–

–

3770 ± 75 mm 148.4 ± 3 in.

4005 ± 80 mm 157.7 ± 3 in.

SAE, JIS

• Bucket struck capacity

• Bucket width

• Swing angle

Slope angle : 1×1

Without side cutter

ROPS L ROPS R

• Max. digging height

ROPS CAB

• Max. dump height

ROPS CAB

G-23 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  

  • Max. dump height (Arm vertical)

ROPS

–

–

1425 ± 43 mm 56.1 ± 2 in.

1825 ± 55 mm 71.9 ± 2 in.

–

–

2390 ± 72 mm 94.1 ± 3 in.

2460 ± 74 mm 96.9 ± 3 in.

–

–

1960 ± 59 mm 77.2 ± 2 in.

2020 ± 61 mm 79.5 ± 2 in.

1960 ± 5 mm 77.2 ± 0.2 in.

1960 ± 5 mm 77.2 ± 0.2 in.

• Height (STD)

408 ± 10 mm 16.1 ± 0.4 in.

408 ± 10 mm 16.1 ± 0.4 in.

• Max. lift above GL (STD)

440 ± 50 mm 17.3 ± 2 in.

440 ± 50 mm 17.3 ± 2 in.

• Max. below GL (STD)

410 ± 50 mm 16.1 ± 2 in.

410 ± 50 mm 16.1 ± 2 in.

CAB

• Min. turning radius

ROPS CAB

• Min. turning radius (Left swing)

ROPS CAB

 • Width (STD)

Bucket tooth slaggish Front boom lateral declination Blade's lateral declination Clearance between bucket crow and boom cylinder cover Approach angle STD Crawler height Max. crawler height

73 mm > 2.87 in. > 10 mm > 0.39 in. > 10 mm > 0.39 in. > 100 ± 19 mm 4.72 ± 0.7 in.

30 ± 3 ° 523 ± 10 mm 20.59 ± 0.4 in.

555 ± 11 mm 21.85 ± 0.4 in.



Without shockless F=30 kgf (66 lbf)

Boom max. height, Arm crowd Include grouser height of the crawler

G-24 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

   

 Max, engine rpm • no load



2400 rpm >

2400 rpm >

• 2 pump relief (Variable displacement pump)

1980 rpm < (1 pump relief)

1980 rpm <

Arm and bucket Slow operation to relief, Oil temp. : 50 ± 5 °C (122 ± 9 °F)

• Blade + 2 pump relief (Variable displacement pump)

–

1980 rpm <

Blade relief, Arm and bucket Slow operation to relief, Oil temp. : 50 ± 5 °C (122 ± 9 °F)

• Idling RPM

1125 ± 75 rpm

  Travel motor block performance

L

R Max, Traction force

Travel straightness

Travel straightness

F1

0 mm 0 in.

3426 kgf < 33.6 kN < 7554 lbf <

0 mm 0 in.

4140 kgf < 40.6 kN < 9127 lbf <

F2

–

–

F1

600 mm > 23.62 in. >

600 mm > 23.62 in. >

F2

600 mm > 23.62 in. > 600 mm > 23.62 in. >

600 mm > 23.62 in. > 600 mm > 23.62 in. >

600 mm > 23.62 in. >

600 mm > 23.62 in. >

Steel

80 to 85 mm 3.15 to 3.35 in.

80 to 85 mm 3.15 to 3.35 in.

Rubber

10 to 15 mm 0.39 to 0.59 in.

10 to 15 mm 0.39 to 0.59 in.

Blade F1

Blade R1

Track shoe sag distance

   0 mm 0 mm 0 in.

0 in.

 20 deg. slope, 10 min, Engine stop Oil temp. : 50 ± 5 °C (122 ± 9 °F) With parking brake Slip 70% theoretical torque Travel stance, Oil temp. : 50 ± 5 °C (122 ± 9 °F) Data N/A, traveling speed reduce to low range.

Travel stance, 10 m (394 in.) distance Engine Max. speed Oil temp. : 50 ± 5 °C (122 ± 9 °F) Travel stance, Blade up and down 10 m (394 in.) distance Engine Max. speed Oil temp. : 50 ± 5 °C (122 ± 9 °F)

G-25 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  Arm digging force

Bucket digging force

Blade force

Down

Boom speed (ROPS) • Up (Ground to max. up)

   2131 kgf < 2770 kgf < 20.9 kN < 23.3 kN < 4699 lbf < 5238 lbf < 3192 kgf < 4315 kgf < 31.3 kN < 40.2 kN < 7037 lbf < 9037 lbf < 3314 kgf < 3952 kgf < 32.5 kN < 36.8 kN < 7306 lbf < 8273 lbf < –

–

• Up (max. down to max. up)

–

–

• Down (max. up to Ground)

–

–

–

–

2.7 ± 0.3 sec.

2.7 ± 0.3 sec.

• Up (max. down to max. up)

4.5 ± 0.3 sec.

4.5 ± 0.3 sec.

• Down (max. up to Ground)

3.1 ± 0.3 sec.

3.4 ± 0.3 sec.

• Down (max. up to max. down) Arm speed Crowd

4.9 ± 0.3 sec.

3.2 ± 0.3 sec.

4.9 ± 0.3 sec.

3.2 ± 0.3 sec.

Dump Crowd

2.8 ± 0.3 sec.

2.9 ± 0.3 sec.

2.8 ± 0.3 sec.

3.0 ± 0.3 sec.

Dump Up (Ground to max. up)

2.2 ± 0.3 sec.

1.1 ± 0.3 sec.

2.1 ± 0.3 sec.

1.1 ± 0.3 sec.

Up (max. down to max. up)

2.4 ± 0.3 sec.

2.2 ± 0.3 sec.

Down (max. up to Ground)

1.5 ± 0.3 sec.

1.5 ± 0.3 sec.

Down(max. up to max. down)

2.3 ± 0.3 sec.

2.9 ± 0.3 sec.

• Down (max. up to max. down) Boom speed (CAB) • Up (Ground to max. up)

Bucket speed

Blade speed

Arm cylinder cavitation

5 mm > 0.2 in. >

 Bucket tooth root [Arm cylinder length : 1403 mm (55.2 in.)]

Bucket tooth root [Bucket cylinder length :1098 mm (43.2 in.)]

Cutting edge down force at ground level Arm extend. bucket dump with no load.

Oil temp. 50 ± 5 °C (122 ± 9 °F) exclude cushioning

Cylinder full stroke Oil temp. 50 ± 5 °C (122 ± 9 °F) Cylinder full stroke Oil temp. 50 ± 5 °C (122 ± 9 °F) Cylinder full stroke Oil temp. 50 ± 5 °C (122 ± 9 °F)

Oil temp. 50 ± 5 °C (122 ± 9 °F) Engine speed : 1300 rpm Bucket loaded at heaped.

G-26 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

 Max. digging height radius

ROPS CAB

Max. dump height radius

ROPS CAB

Bucket bottom height at arm vertical

ROPS CAB

Bucket wrist angle

   – – 3285 ± 329 mm 129.3 ± 12.9 in.

–

3430 ± 343 mm 135.0 ± 13.5 in.

–

3420 ± 205 mm 134.6 ± 8.1 in.

–

3550 ± 213 mm 139.8 ± 8.4 in.

–

1790 ± 54 mm 70.5 ± 2.1 in.

184.5 ± 3.0 °

1825 ± 55 mm 71.9 ± 2.2 in.

185.0 ± 3.0 °



at bucket pin

Bucket horizontal Boom max. height, Arm dump max.

G-27 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

   





Swivel torque

Swivel capable slope angle

Swivel block performance (with negative break) • Engine stop

L

1237 kgf·m < 12.1 kN·m < 8947 lbf·ft <

1237 kgf·m < 12.1 kN·m < 8947 lbf·ft <

R

L

1237 kgf·m < 12.1 kN·m < 8947 lbf·ft < 17 ° <

1237 kgf·m < 12.1 kN·m < 8947 lbf·ft < 17 ° <

R

17 ° <

17 ° <

L

5°>

5°>

5°>

5°>

R

30 ° >

30 ° >

L

30 ° > 2.8 ± 0.3 sec.

30 ° > 2.8 ± 0.3 sec.

R

2.8 ± 0.3 sec.

2.8 ± 0.3 sec.

5.5 ± 0.5 sec.

6.5 ± 0.5 sec.

6.4 ± 0.5 sec.

7.9 ± 0.5 sec.

R • Engine idling

Swivel start-up speed

L

Swing speed (ROPS)

L

Swing speed (CAB)

R L

Swing Lock

R Swivel R and L

10 mm > 0.39 in. >

Arm extend, Quick operation Engine Max. speed Oil temp. : 50 ± 5 °C (122 ± 9 °F)

Front horizontal, Bucket load heaped [420 kg (926 lbs) : including bucket], Engine Max. speed, Oil temp.: 50 ± 5 °C (122 ± 9 °F) Bucket load heaped [420kg (926 lbs) : including bucket], Slope angle at 20 degrees for 1 min.

Engine stop.

Oil temp. : 50 ± 5 °C (122 ± 9 °F)

Front horizontal, 90 ° swivel Bucket load heaped [420 kg (926 lbs) : including bucket].

Engine Max. Speed Oil temp. : 50 ± 5 °C (122 ± 9 °F) Front horizontal, bucket crowd with no load.

Engine Max. speed Oil temp. : 50 ± 5 °C (122 ± 9 °F) 90 ° swivel, 100 times actual Bucket load heaped [420 kg (926 lbs) : including bucket].

Oil temp. : 50 ± 5 °C (122 ± 9 °F)

G-28 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

   

 Cylinder oil sealing capacity (Boom) • 50 ± 5 °C (122 ± 9 °F)

• 95 ± 5 °C (203 ± 9 °F)

20 mm > 0.79 in. >

20 mm > 0.79 in. >

20 mm > 0.79 in. >

20 mm > 0.79 in. >

Cylinder oil sealing capacity (Arm) • 50 ± 5 °C (122 ± 9 °F) Cylinder oil sealing capacity (Bucket) • 50 ± 5 °C (122 ± 9 °F) Cylinder oil sealing capacity (Blade) • 50 ± 5 °C (122 ± 9 °F) Boom cushioning performance • 30 °C (86 °F)

20 mm > 0.79 in. > 10 mm > 0.39 in. > 20 mm > 0.79 in. >

3 sec. >

3 sec. >

• 50 °C (122 °F)

0.4 to 1.3 sec.

0.4 to 1.3 sec.

• 80 °C (176 °F)

0.3 sec. <

0.3 sec. <

 Arm extend. Bucket crowd for 10 min.

Bucket load heaped [420 kg (926 lbs) : including bucket].

Arm vertical. blade cylinder extended for 10 min. engine stop.

Arm extended, bucket crowd with no load.

Engine Max. speed.

  Boom lever

Up

Down

Arm lever

Crowd

Dump

Bucket lever

Crowd

Dump

Swivel lever

R

L

   1.2 ± 0.5 kgf 1.2 ± 0.5 kgf 12 ± 5 N 12 ± 5 N 2.7 ± 1.1 lbf 2.7 ± 1.1 lbf 1.4 ± 0.5 kgf 14 ± 5 N 3.1 ± 1.1 lbf 1.2 ± 0.5 kgf 12 ± 5 N 2.7 ± 1.1 lbf

1.4 ± 0.5 kgf 14 ± 5 N 3.1 ± 1.1 lbf 1.2 ± 0.5 kgf 12 ± 5 N 2.7 ± 1.1 lbf

1.4 ± 0.5 kgf 14 ± 5 N 3.1 ± 1.1 lbf 1.0 ± 0.5 kgf 10 ± 5 N 2.2 ± 1.1 lbf

1.4 ± 0.5 kgf 14 ± 5 N 3.1 ± 1.1 lbf 1.0 ± 0.5 kgf 10 ± 5 N 2.2 ± 1.1 lbf

1.0 ± 0.5 kgf 9±5N 2.0 ± 1.1 lbf 1.0 ± 0.5 kgf 10 ± 5 N 2.2 ± 1.1 lbf

1.0 ± 0.5 kgf 10 ± 5 N 2.2 ± 1.1 lbf 1.0 ± 0.5 kgf 10 ± 5 N 2.2 ± 1.1 lbf

1.0 ± 0.5 kgf 10 ± 5 N 2.2 ± 1.1 lbf

1.0 ± 0.5 kgf 10 ± 5 2.2 ± 1.1 lbf

 Measuring point : 20 mm (0.79 in.) lower from the lever top.

Pilot lever with engine Max. speed.

G-29 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

 Blade lever

Up

Down

Travel lever (L)

1.6 ± 0.5 kgf 16 ± 5 N 3.6 ± 1.1 lbf 1.9 ± 0.5 ± kgf 19 ± 5 N 4.3 ± 1.1 lbf

1.6 ± 0.5 kgf 16 ± 5 N 3.6 ± 1.1 lbf 1.9 ± 0.5 kgf 19 ± 5 N 4.3 ± 1.1 lbf

1.9 ± 0.5 kgf 19 ± 5 N 4.3 ± 1.1 lbf 1.9 ± 0.5 kgf 19 ± 5 N 4.3 ± 1.1 lbf

1.9 ± 0.5 kgf 19 ± 5 N 4.3 ± 1.1 lbf 1.9 ± 0.5 kgf 19 ± 5 N 4.3 ± 1.1 lbf

1.9 ± 0.5 kgf 19 ± 5 N 4.3 ± 1.1 lbf 6.0 ± 1.0 kgf 59 ± 10 N 13.3 ± 2.2 lbf

1.9 ± 0.5 kgf 19 ± 5 N 4.3 ± 1.1 lbf 6.0 ± 1.0 kgf 59 ± 10 N 13.3 ± 2.2 lbf

6.0 ± 1.0 kgf 59 ± 10 N 13.3 ± 2.2 lbf 2.8 ± 1.0 kgf 27 ± 10 N 6.1 ± 2.2 lbf

6.0 ± 1.0 kgf 59 ± 10 N 13.3 ± 2.2 lbf 2.8 ± 1.0 kgf 27 ± 10 N 6.1 ± 2.2 lbf

7.0 ± 1.0 kgf 69 ± 10 N 15.5 ± 2.2 lbf –

7.0 ± 1.0 kgf 69 ± 10 N 15.5 ± 2.2 lbf –

Up

84 ± 10 mm 3.31 ± 0.4 in.

84 ± 10 mm 3.31 ± 0.4 in.

Down

84 ± 10 mm 3.31 ± 0.4 in.

84 ± 10 mm 3.31 ± 0.4 in.

84 ± 10 mm 3.31 ± 0.4 in.

84 ± 10 mm 3.31 ± 0.4 in.

84 ± 10 mm 3.31 ± 0.4 in.

84 ± 10 mm 3.31 ± 0.4 in.

Forward

Back

Travel lever (R)

Forward

Back

Swing pedal

R

L

Safety lock lever (L)

Up

Down

Travel Hi-Lo change Boom lever stroke

Arm lever stroke

   1.6 ± 0.5 kgf 1.6 ± 0.5 kgf 16 ± 5 N 16 ± 5 N 3.6 ± 1.1 lbf 3.6 ± 1.1 lbf

Crowd

Dump

 Up and down Measuring point : 15 mm (0.59 in.) lower from the lever top

Measuring point : 20 mm (0.79 in.) lower from the lever top.

Pedal edge.

45 ° inward

This machine has a switch.

Measuring point : The lever top.

Pilot lever with engine Max. speed.

G-30 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

 Bucket lever stroke

Crowd

Dump Bucket lever stroke

R

L Blade lever stroke

Up

Down Travel lever stroke (L)

Forward

Back Travel lever stroke (R)

Forward

Back

   74 ± 10 mm 74 ± 10 mm 2.91 ± 0.4 in.

2.91 ± 0.4 in.

74 ± 10 mm 2.91 ± 0.4 in.

74 ± 10 mm 2.91 ± 0.4 in.

74 ± 10 mm 2.91 ± 0.4 in.

74 ± 10 mm 2.91 ± 0.4 in.

74 ± 10 mm 2.91 ± 0.4 in.

60 ± 10 mm 2.36 ± 0.4 in.

74 ± 10 mm 2.91 ± 0.4 in.

60 ± 10 mm 2.36 ± 0.4 in.

60 ± 10 mm 2.36 ± 0.4 in.

100 ± 10 mm 3.94 ± 0.4 in.

60 ± 10 mm 2.36 ± 0.4 in.

100 ± 10 mm 3.94 ± 0.4 in.

100 ± 10 mm 3.94 ± 0.4 in.

100 ± 10 mm 3.94 ± 0.4 in.

100 ± 10 mm 3.94 ± 0.4 in.

100 ± 10 mm 3.94 ± 0.4 in.

100 ± 10 mm 3.94 ± 0.4 in.

100 ± 10 mm 3.94 ± 0.4 in.

 Measuring point : The lever top.

Pilot lever with engine Max. speed.

Measuring point : The lever top.

RY9212052GEG0005US0

G-31 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM















(1)

815 mm 32.1 in.

(8)

3770 mm 148.4 in.

4005 mm 157.7 in.

(15)

2500 mm 98.43 in.

(2)

625 mm 24.6 in.

(9)

3380 mm 133.1 in.

3630 mm 142.9 in.

(16)

1820 mm 71.65 in.

(3)

1960 mm 77.2 in.

(10)

2670 mm 105.1 in.

2830 mm 111.4 in.

(17)

5330 mm 209.8 in.

5500 mm 216.5 in.

(11)

2390 mm 94.09 in.

2460 mm 96.9 in.

(18)

5710 mm 224.8 in.

5960 mm 234.6 in.

(19)

5850 mm 230.3 in.

6105 mm 240.4 in.

(4)

990 mm 39.0 in.

1045 mm 44.1 in.

(5)

1830 mm 72.0 in.

(12)

2550 mm 100.4 in.

(6)

1960 mm 77.2 in.

(13)

440 mm 17.3 in.

(14)

410 mm 16.2 in.

(7)

5440 mm 214.2 in.

5665 mm 223.0 in.

       RY9212052GEG0006US0

G-32 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  





Radiator

7.0 L 1.85 U.S.gal

Reserve tank

1.1 L 0.29 U.S.gal

Engine crank case

9.0 L 2.38 U.S.gal

SAE 10W-30 (CF or CI-4)

Full

79 L 20.87 U.S.gal

ISO VG46

Tank

45 L 11.89 U.S.gal

ISO VG46

0.9 L 0.24 U.S.gal

SAE90 (API GL-4)

Hydraulic oil

Travel motor

KUBOTA LLC-N-50F 50%

Track roller

80 ml 4.88 cu.in

SAE30 (CD)

Carrier roller

60 ml 3.66 cu.in

SAE30 (CD)

Front idler

50 ml 3.05 cu.in

SAE30 (CD)

Fuel tank

68 L 18.0 U.S.gal

Diesel Fuel JIS #3 (Initial) RY9212052GEG0007US0

G-33 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

      NOTE : KUBOTA JAPAN BUCKET



G-34 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

 





(1)

550 mm 21.65 in.

600 mm 23.62 in.

(2)

600 mm 23.62 in.

650 mm 25.59 in.







(8)

83 mm 3.27 in.

(9)







(15)

12 mm 0.47 in.

100 mm 39.4 in.

(16)













(22)

180 mm 7.09 in.

(29)

80 mm 3.15 in.

743 mm 29.25 in.

(23)

5 mm 0.20 in.

(30)

35 mm 1.38 in.

(3)

247 mm 9.72 in.

(10)

45 mm 1.77 in.

(17)

30 mm 1.18 in.

(24)

16 mm 0.63 in.

(31)

80 mm 3.15 in.

(4)

145 mm 5.71 in.

(11)

45 mm 1.77 in.

(18)

230 mm 9.06 in.

(25)

28.5 mm 1.12 in.

(32)

165 mm 6.50 in.

(5)

65 mm 2.56 in.

(12)

28 mm 1.10 in.

(19)

150 mm 5.91 in.

(26)

156 mm 6.14 in.

173 mm 6.81 in.

(33)

1.5 mm 0.06 in.

(6)

35 mm 1.38 in.

(13)

M16 x 1.5 x 2.5

(20)

72 mm 2.83 in.

(27)

78.5 mm 3.09 in.

87 mm 3.41 in.

(34)

165 mm 6.50 in.

(7)

16 mm 0.63 in.

(14)

483 mm 19.02 in.

(21)

98 mm 3.86 in.

(28)

(35)

849 mm 33.43 in.

173 mm 6.81 in.

RY9212052GEG0008US0

 

  

(1)

 





200 mm 7.87 in.



















(6)

1343 mm 52.87 in.

1360 mm 53.54 in.

(11)

133 mm 5.24 in.

(16)

145 mm 5.71 in.

(2)

1250 mm 49.21 in.

1370 mm 53.94 in.

(7)

315 mm 12.40 in.

(12)

145 mm 5.71 in.

(17)

61 mm 2.40 in.

(3)

338 mm 13.31 in.

353 mm 13.90 in.

(8)

335 mm 13.19 in.

(13)

45 mm 1.77 in.

(18)

45 mm 1.77 in.

(4)

217 mm 7.60 in.

193 mm 7.60 in.

(9)

10 mm 0.39 in.

(14)

45 mm 1.77 in.

(19)

45 mm 1.77 in.

(5)

350 mm 13.78 in.

335 mm 13.19 in.

(10)

145 mm 5.71 in.

(15)

145 mm 5.71 in.

RY9212052GEG0009US0

G-35 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  



Identification mark (Core metal lapping position) 19 mm 0.75 in.

(1) Lug height (2) Link height

24 mm 0.94 in.

25 mm 0.96 in.

400 mm 15.75 in.

(3) Crawler width

10 to 15 mm 0.39 to 0.59 in.

(4) Crawler sag distance (5) Crawler height

88.0 mm 3.46 in.

91.0 mm 3.58 in.

Number of core metal

74

Circumference

5365 mm 211.2 in.

Core metal pitch

72.5 mm 2.85 in.

RY9212052GEG0010US0

  Crawler width





400 mm 15.75 in.

550 mm 21.65 in.

(1) 4 links length

540 mm 21.26 in.

(2) Height

67.0 mm 2.64 in.

(3) Bushing O. D.

35.0 mm 1.38 in.

(4) Bushing I. D.

22.5 mm 0.89 in.

(5) Master pin O. D.

22.15 mm 0.87 in.

(6) Grouser height

20.0 mm 0.79 in.

(7) Crawler sag distance Number of links

80 to 85 mm 3.15 to 3.35 in.

39 RY9212052GEG0011US0

G-36 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  

(1) Guide diameter

85 mm 3.35 in.

(2) Outer diameter

135 mm 5.31 in.

(3) Roller width (4) Carrier roller diameter  

200 mm 7.87 in.

80 mm 3.15 in.  

RY9212052GEG0012US0



(1) Idler O.D.

300 mm 12.99 in.

(2) Guide width

52 mm 2.05 in.

(3) Idler width

93 mm 3.66 in.

(4) Sprocket wheel O.D.

429 mm 16.89 in.

(5) Sprocket wheel width

43 mm 1.69 in.

 

 

RY9212052GEG0013US0

G-37 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  



















 

U48-4

50 mm 1.97 in.

50 mm 1.97 in.

70 mm 2.76 in.

70 mm 2.76 in.

50 mm 1.97 in.

90 mm 3.54 in.

108 mm 4.25 in.

49 mm 1.03 in.

50 mm 1.97 in.

PF 1/2"

U55-4

55 mm 2.17 in.

55 mm 2.17 in.

70 mm 2.76 in.

70 mm 2.76 in.

55 mm 2.17 in.

95 mm 3.74 in.

117 mm 4.61 in.

55 mm 2.17 in.

50 mm 1.97 in.

PF 1/2"

U48-4

45 mm 1.77 in.

45 mm 1.77 in.

70 mm 2.76 in.

70 mm 2.76 in.

50 mm 1.97 in.

80 mm 3.15 in.

96 mm 3.78 in.

49 mm 1.03 in.

50 mm 1.97 in.

PF 1/2"

U55-4

50 mm 1.97 in.

50 mm 1.97 in.

70 mm 2.76 in.

70 mm 2.76 in.

55 mm 2.17 in.

85 mm 3.35 in.

105 mm 4.13 in.

55 mm 2.17 in.

50 mm 1.97 in.

PF 1/2"

U48-4

45 mm 1.77 in.

45 mm 1.77 in.

60 mm 2.36 in.

60 mm 2.36 in.

40 mm 1.57 in.

70 mm 2.76 in.

85 mm 3.35 in.

42 mm 1.65 in.

39 mm 1.54 in.

PF 1/2"

U55-4

45 mm 1.77 in.

45 mm 1.77 in.

60 mm 2.36 in.

60 mm 2.36 in.

45 mm 1.77 in.

75 mm 2.95 in.

91 mm 3.58 in.

40 mm 1.57 in.

40 mm 1.57 in.

PF 1/2"

U48-4

45 mm 1.77 in.

45 mm 1.77 in.

60 mm 2.36 in.

60 mm 2.36 in.

45 mm 1.77 in.

85 mm 3.35 in.

102 mm 4.02 in.

49 mm 1.03 in.

50 mm 1.97 in.

G 1/4"

U55-4

45 mm 1.77 in.

45 mm 1.77 in.

60 mm 2.36 in.

60 mm 2.36 in.

50 mm 1.97 in.

90 mm 3.54 in.

107 mm 4.21 in.

49 mm 1.03 in.

50 mm 1.97 in.

G 1/4"

U48-4

55 mm 2.17 in.

55 mm 2.17 in.

70 mm 2.76 in.

70 mm 2.76 in.

55 mm 2.17 in.

95 mm 3.74 in.

114 mm 4.49 in.

55 mm 2.17 in.

55 mm 2.17 in.

G 3/8"

U55-4

55 mm 2.17 in.

55 mm 2.17 in.

70 mm 2.76 in.

70 mm 2.76 in.

60 mm 2.36 in.

110 mm 4.33 in.

131 mm 5.16 in.

55 mm 2.17 in.

56 mm 2.20 in.

G 3/8"

Boom

Arm

Bucket

Swing

Blade

RY9212052GEG0014US0

G-38 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  



Track frame

566 kg 1248 lbs

615 kg 1355.8 lbs

Swivel frame

543 kg 1197 lbs

585 kg 1290 lbs

Swing bracket

112.0 kg 246.9 lbs

121.0 kg 266.8 lbs

Boom

172.0 kg 379.2 lbs

208.0 kg 458.6 lbs

92 kg 203 lbs

102 kg 224.9 lbs

107.0 kg 235.9 lbs

110.0 kg 244.7 lbs

Arm (STD) Bucket

Without teeth and side cutter

241.0 kg 531.3 lbs

Blade Weight (rear)

287.0 kg 632.7 lbs

698 kg 1539 lbs

Rubber crawler

265.0 kg 584.2 lbs

240.0 kg 529.1 lbs 285.0 kg 628.3 lbs

Steel crawler (STD.) Steel crawler (wide)



385.0 kg 848.8 lbs

–

Arch frame

51.0 kg 112.4 lbs

Engine

225.0 kg 496.0 lbs

Dry weight

Hydraulic tank

38.0 kg 83.8 lbs

With filter

Fuel tank

4.2 kg 9.3 lbs

Swivel bearing

62.0 kg 137.0 lbs

68.6 kg 151.2 lbs

Battery

22.7 kg 49.9 lbs

Track roller

9.4 kg 20.7 lbs

Upper roller

3.3 kg 7.2 lbs 225.0 kg 496.0 lbs

ROPS/FOPS cabin Hydraulic pump

34.0 kg 75.0 lbs

42.0 kg 92.6 lbs

Traveling motor

59.0 kg 130.0 lbs

58.0 kg 127.9 lbs

Swivel motor

50.0 kg 110.2 lbs

Sprocket

15.3 kg 33.8 lbs

Idler ass'y

46.4 kg 102.3 lbs

Control valve

59.5 kg 131.2 lbs

Without adaptors

Boom cylinder

48.0 kg 106.0 lbs

60.0 kg 132.3 lbs

Arm cylinder

45.0 kg 99.2 lbs

56.0 kg 123.5 lbs

G-39 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

Bucket cylinder





26.0 kg 57.3 lbs

32.0 kg 70.5 lbs 37.3 kg 82.2 lbs

Swing cylinder Blade cylinder Rotary joint



28.6 kg 63.1 lbs

36.5 kg 80.5 lbs 27.7 kg 61.1 lbs

The above weight list is based on calculation and slightly different from actual ones.

RY9212052GEG0015US0

G-40 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

    

                    

Check the fuel level

daily

Check the coolant level

daily

Checking the engine oil level

daily

Check the hydraulic oil level

daily

Grease the bucket bolt and bucket linkage bolt

daily

Check the V-belt

daily

Check the fluid level of the washer system reservoir

daily

Check the electric cables and connections

daily

Clean the radiator and condenser

daily

Lubricate the front-end attachments : Grease the swing bracket Other greasing points

daily

Check the water separator

50 h

Drain water from the fuel tank

50 h

Check the battery electrolyte level

50 h

Crawlers and track frame: Clean, visually inspect and check tension

50 h

Grease the swivel gear

*1



50 h

Grease the pitch bearing

200 h

Check and clean the interior air filter

200 h

*1 Check, clean the air filter

200 h

Check the coolant hoses and hose clamps

200 h

Check the fuel lines and air intake hoses

200 h

Check the pipes and hoses of the air conditioner

annually

*1 : Under very dusty conditions, the air filter and the interior air filter must be cleaned more frequently or replaced.

G-41 KiSC issued 03, 2010 A

GENERAL

U48-4,U55-4, WSM

  

                    

Check the coolant hoses and hose clamps



250 h

*3

Replace the coolant hoses and hose clamps

every 2 years

*3

Replace the fuel lines and air intake hoses

every 2 years

Check and adjust the V-belt

250 h

Change the engine oil and oil filter

500 h

*4 Replace the drive unit oil

500 h

Replace the fuel filter

500 h

Replace the tank breather filter

500 h

*2 Replace the return filter

1000 h

Replace the pilot circuit filter

1000 h

Change the hydraulic oil and *2 replace the suction filter

1000 h

*1 Replace the air filter elements

1000 h

*1 Replace the interior air filter

1000 h

Change the oil of the idler and *3 track roller

2000 h

*3

Check alternator and starter motor

2000 h

*3

Replace the pipes and hoses of the air conditioner

every 2 years

Replace the coolant

every 2 years

*3 Change the hydraulic hoses

every 6 years

Check the coolant content

maintenance on demand

*5 Safety inspection

annually

The servicing identified with must be carried after the specified hours of operation after initial operation have been reached. *1 : Under very dusty conditions, the air filter and the interior air filter must be cleaned more frequently or replaced. *2 : When using a hydraulic hammer over 20 % every 800 h.

When using a hydraulic hammer over 40 % every 400 h.

When using a hydraulic hammer over 60 % every 300 h.

When using a hydraulic hammer over 80 % every 200 h. *3 : Please contact your KUBOTA dealer. *4 : Earlier if necessary. *5 : At least annually.

RY9212032GEG0005US0

G-42 KiSC issued 03, 2010 A

 

KiSC issued 03, 2010 A

  1. FRONT OPERATING MACHINE.................................................................................................1-S1 [1] BLADE ...................................................................................................................................1-S1 (1) Blade dimension ..............................................................................................................1-S1 [2] FRONT PIN ...........................................................................................................................1-S2 2. SWIVEL FRAME..........................................................................................................................1-S3 [1] WEIGHT DIASSEMBLY / ASSEMBLY ..................................................................................1-S3 [2] FUEL TANK ...........................................................................................................................1-S5 [3] HYDRAULIC OIL TANK ........................................................................................................1-S8 (1) Hydraulic oil tank components.........................................................................................1-S8 (2) Hydraulic oil return filter replacement procedure.............................................................1-S9 (3) Filter (suction) replacement procedure..........................................................................1-S10 (4) Filter (breather) replacement procedure........................................................................1-S11 (5) Assembly of anti vibration support for the hydraulic oil tank..........................................1-S12 [4] ENGINE ...............................................................................................................................1-S13 (1) Engine mount ................................................................................................................1-S13 (2) Muffler............................................................................................................................1-S14 (3) Arch, Air cleaner ............................................................................................................1-S15 (4) Radiator .........................................................................................................................1-S16 (5) Oil cooler .......................................................................................................................1-S17 (6) Accelerator cable...........................................................................................................1-S18 [5] ASSEMBLING OF OPERATING LEVERS ..........................................................................1-S19 (1) Travel lever....................................................................................................................1-S19 (2) Blade lever.....................................................................................................................1-S20 3. TRACK FRAME .........................................................................................................................1-S21 [1] ASSEMBLING OF SWIVEL BEARING ...............................................................................1-S21 [2] TRACK ................................................................................................................................1-S23 (1) Assembly / disassembly of rubber track ........................................................................1-S23 (2) Assembly / disassembly of iron tracks...........................................................................1-S24 [3] FRONT IDLER.....................................................................................................................1-S27 (1) Assembly / disassembly of front idler ............................................................................1-S27 (2) Front idler structural components ..................................................................................1-S27 [4] SPRING ASSY ....................................................................................................................1-S28 (1) Assembly / disassembly of spring assy .........................................................................1-S28 [5] CYLINDER ASSEMBLY ......................................................................................................1-S29 (1) Assembly / disassembly of cylinder assy ......................................................................1-S29 (2) Cylinder assembly structural components.....................................................................1-S29 [6] TRACK ROLLER .................................................................................................................1-S31 (1) Assembly / disassembly of track roller ..........................................................................1-S31 (2) Track roller structural components ................................................................................1-S32 [7] CARRIER ROLLER .............................................................................................................1-S33 (1) Assembly / disassembly of carrier roller ........................................................................1-S33 (2) Carrier roller structural components ..............................................................................1-S34

KiSC issued 03, 2010 A

MACHINE BODY

U48-4,U55-4, WSM

       

Pin diameter x length



Pin diameter x length

55 x 65 mm (

2.2 x 2.6 in.)



Blade width



Blade height

408 mm (16.1 in.)



Blade length

1365 mm (53.7 in.)



Blade tip plate height x thickness



Length between blade arms

55 x 25 mm ( 2.2 x 1 in.)

1960 mm (77.2 in.)

65 x t12 mm (2.6 x t0.5 in.)

599 mm (23.6 in.)

RY9212050MBS0014US0

1-S1 KiSC issued 03, 2010 A

MACHINE BODY

U48-4,U55-4, WSM

 





(1)

Pin diameter x length

mm in.

92 x 176 3.62 x 6.93

(2)

Pin diameter x length

mm in.

92 x 150 3.62 x 5.91

(3)

Pin diameter x length

mm in.

45 x 158 1.77 x 6.22

(4)

Pin diameter x length

mm in.

45 x 131 1.77 x 5.16

(5)

Pin diameter x length

mm in.

55 x 347 2.17 x 13.66

(6)

Pin diameter x length

mm in.

55 x 165 2.17 x 6.50

(7)

Pin diameter x length

mm in.

55 x 196 2.17 x 7.72

(8)

Pin diameter x length

mm in.

55 x 235 2.17 x 9.25

(9)

Pin diameter x length

mm in.

50 x 196 1.97 x 7.72

(10)

Pin diameter x length

mm in.

50 x 152 1.97 x 5.98

(11)

Pin diameter x length

mm in.

45 x 257 1.77 x 10.12

(12)

Pin diameter x length

mm in.

45 x 257 1.77 x 10.12

(13)

Pin diameter x length

mm in.

45 x 152 1.17 x 5.98

(14)

Pin diameter x length

mm in.

45 x 204 1.77 x 8.03

(15)

Pin diameter x length

mm in.

45 x 204 1.77 x 8.03

(16)

Pin diameter x length

mm in.

45 x 142 1.77 x 5.59

(17)

Pin diameter x length

mm in.

55 x 154 2.17 x 6.06

     

 

RY9212007GEG0012US0

1-S2 KiSC issued 03, 2010 A

MACHINE BODY

U48-4,U55-4, WSM

     1. Open the bonnet (right) (4), remove the two snap pins (1), (2), and separate the gas damper from the bonnet.

2. Slide the bonnet (right) (4) to the front of the body and remove it.           • Bonnet (right) weight : 27 kg (60 lbs) (1) Snap pin, flat washer (2) Snap pin, flat washer

(3) Gas damper (4) Bonnet (right) RY9212032MBS0009US0

 1. Remove five mounting bolts (2), (3) of the bonnet (left) (4) and remove the bonnet (left) (4).

(1) Cap, assy (2) Bolt (M10 x 35)

(3) Bolt (M10 x 25) (4) Bonnet (rear) RY9212052MBS0011US0

 1. Remove the bolt (1), pull out the pin (2), and remove the bonnet (rear) (3).

2. Remove the mounting bracket (4) and four mounting bolts (5) of the bonnet (rear) and remove the bracket (4).

(1) Bolt (M8 x 16) (2) Pin (3) Bonnet (rear)

(4) Bracket (5) Bolt (M10 x 20) RY9212052MBS0012US0

1-S3 KiSC issued 03, 2010 A

MACHINE BODY

U48-4,U55-4, WSM

 1. Attach two eyebolts (2) to the weight (1), connect a nylon sling (4) to these and support the weight using a crane.

2. Remove the three mounting bolts (3) of the weight, lift slightly with the crane, slide the weight to the rear, lift the weight and remove it from the frame.

Tightening torque

Weight (1)

367.7 to 431.5 N·m 37.5 to 44.0 kgf·m 271.2 to 318.3 lbf·ft

Apply thread locking compound (Loctite 271) • Weight of the weight : 290 kg, 639 lbs (U48-4) 700 kg, 1540 lbs (U55-4)

     (1) (2) (3) (4)

Weight Eyebolt (M24 × P3) Bolt (M20×90) Nylon sling

   

RY9212052MBS0001US0 (1) Weight

(3) Bolt (M20×90) RY9212050MBS0008US0

1-S4 KiSC issued 03, 2010 A

MACHINE BODY

U48-4,U55-4, WSM

  

(1) (2) (3) (4)

Fuel tank assembly Band, assy (fuel tank) Lock nut Flat metal washer

(5) Plate, assy (1, fuel tank support) (6) Bolt (M10 x 20) (7) Flat metal washer

(8) Plate, assy (2, fuel tank support) (9) Bolt (M10 x 25) (10) Flat metal washer

     

RY9212050MBS0001US0



(1) Fuel tank assembly

(2) Bolt (M10 x 25)

 

    

RY9212050MBS0002US0

1-S5 KiSC issued 03, 2010 A

MACHINE BODY

U48-4,U55-4, WSM



(1) Guide (2) Clamp

(3) Clamp RY9212032MBS0014US0

1-S6 KiSC issued 03, 2010 A

MACHINE BODY

U48-4,U55-4, WSM



(1) Drain cock (2) Fuel tank

(3) Water separator (4) Fuel pump

(5) Fuel filter (6) Engine

(7) Fuel cooler

 

















RD451-51332

730 mm, 28.7 in.

RD451-51341

610 mm, 24 in.

09318-88130



09664-82100

2100 mm, 82.7 in,

RC301-51151

2000 mm, 78.7 in.

14911-42751



09664-80340

340 mm, 13.4 in.

RD451-51352

260 mm, 10.2 in.

14911-42751



09664-80260

260 mm, 10.2 in.

RD451-51382

200 mm, 7.9 in.

14911-42751



09664-80260

260 mm, 10.2 in.

RD451-51382

200 mm, 7.9 in.

14911-42751



09664-40500

500 mm, 19.7 in.

RC461-51641

450 mm, 17.7 in.

14971-42751



09664-41750

1750 mm, 68.9 in.

RD451-51392

1650 mm, 65 in.

14971-42751



09664-80040

40 mm, 1.6 in.

–

–

14911-42751



09664-80040

40 mm, 1.6 in.

–

–

14911-42751



09664-42100

2100 mm, 82.7 in,

RB441-51221

2000 mm, 78.7 in,

14971-42751



09664-60420

420 mm, 16.5 in.

–

–

– RY9212052MBS0008US0

1-S7 KiSC issued 03, 2010 A

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