BOBCAT 731 SKID STEER LOADER Service Repair Manual

7 3 0

7 3 1 INCLUDES H SERIES

Service Manual

7 3 2

6556583 (4–79)

Printed in U.S.A.

© Melroe Company 1979

MAINTENANCE SAFETY WARNING

Instructions are necessary before operating or servicing machine. Read and understand the Operation & Maintenance Manual, Operator’s Handbook and signs (decals) on machine. Follow warnings and instructions in the manuals when making repairs, adjustments or servicing. Check for correct function after adjustments, repairs or service. Untrained operators and failure to follow W-2003-0903 instructions can cause injury or death.

Safety Alert Symbol: This symbol with a warning statement, means: “Warning, be alert! Your safety is involved!” Carefully read the message that follows.

CORRECT

CORRECT

CORRECT

B-10731a

B-12365

B-7469

Never service the Bobcat SkidSteer Loader without instructions.

Use the correct procedure to lift or lower operator cab.

Cleaning and maintenance are required daily.

WRONG

WRONG

WRONG

B-11799

B-15231

B-15280

Have good ventilation when welding or grinding painted parts.

Wear dust mask when grinding painted parts. Toxic dust and gas can be produced.

Avoid exhaust fume leaks which can kill without warning. Exhaust system must be tightly sealed.

Disconnecting or loosening any hydraulic tubeline, hose, fitting, component or a part failure can cause lift arms to drop. Do not go under lift arms when raised unless supported by an approved lift arm support device.

Replace it if damaged.

Never work on loader with lift arms up unless lift arms are held by an approved lift arm support device. Replace if damaged.

Never modify equipment or add attachments not approved by Bobcat Company.

WRONG

WRONG

WRONG

B-6590

B-6580 B-16102

B-6589 B-16102

Stop, cool and clean engine of flammable materials before checking fluids.

Never service or adjust loader with the engine running unless instructed to do so in the manual.

Avoid contact with leaking hydraulic fluid or diesel fuel under pressure. It can penetrate the skin or eyes.

Never fill fuel tank with engine running, while smoking or when near open flame.

Keep body, jewelry and clothing away from moving parts, electrical contact, hot parts and exhaust.

Wear eye protection to guard from battery acid, compressed springs, fluids under pressure and flying debris when engines are running or tools are used.

Use eye protection approved for type of welding.

Keep rear door closed except for service. Close and latch door before operating the loader.

Lead-acid batteries produce flammable and explosive gases.

Keep arcs, sparks, flames and lighted tobacco away from batteries.

Batteries contain acid which burns eyes or skin on contact.

Wear protective clothing. If acid contacts body, flush well with water. For eye contact flush well and get immediate medical attention.

Maintenance procedures which are given in the Operation & Maintenance Manual can be performed by the owner/ operator without any specific technical training. Maintenance procedures which are not in the Operation & Maintenance Manual must be performed ONLY BY QUALIFIED BOBCAT SERVICE PERSONNEL. Always use genuine Bobcat replacement parts. The Service Safety Training Course is available from your Bobcat dealer.

MSW01-0805

CONTENTS PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1 HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1 HYDROSTATIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1 DRIVE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1 MAIN FRAME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1 ELECTRICAL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1 ENGINE SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1 TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–1

PREVENTIVE MAINTENANCE

HYDRAULIC SYSTEM

HYDROSTATIC SYSTEM

DRIVE SYSTEM

MAIN FRAME

ELECTRICAL SYSTEM

ENGINE SERVICE

TECHNICAL DATA

ALPHABETICAL INDEX

1––5

730, 731, 732 Loader Service Manual

FOREWORD This manual is for the Bobcat loader mechanic. It provides necessary servicing and adjustment procedures for the Bobcat loader and its component parts and systems. Refer to the Operator’s Manual for operating instructions, starting procedure, daily checks, etc.

A general inspection of the following items must be made after the loader has had service or repair: 1. Check that the ROPS/FOPS (Including sidescreens) is in good condition and is not modified.

9. Enclosure door latches must open and close freely.

2. Check that ROPS mounting hardware is tightened and is Melroe approved.

10. Bob–Tach wedges and linkages must function correctly and be in good condition.

3. The seat belt must be correctly installed, functional and in good condition.

11. Safety treads must in good condition.

4. The seat bar and pedal interlocks must be correctly adjusted, clean and lubricated.

12. Check for correct function of indicator lamps (Optional on some models).

5. Machine signs must be legible and in the correct location.

13. Check hydraulic fluid level, engine oil level and fuel supply.

6. Steering levers and foot pedals must return to neutral.

14. Inspect for fuel, oil or hydraulic fluid leaks.

7. Check for correct function of the work lights and travel lights.

15. Lubricate the loader.

8. The parking brake function correctly.

16. Check the condition of the battery and cables.

must

1––3

730, 731, 732 Loader Service Manual

17. Inspect the air cleaner for damage or leaks. Check the condition of the element.

18. Check the electrical charging system.

19. Check tires for wear and pressure.

20. Inspect for loose or broken parts or connections.

21. Operate the loader and check all functions.

Recommend to the owner that all necessary corrections be made before the machine is returned to service.

1––2

730, 731, 732 Loader Service Manual

PREVENTIVE MAINTENANCE

PREVENTIVE MAINTENANCE Paragraph Number

BOB–TACH AND PIVOT PINS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ENGINE SERVICE (GENERAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

HYDRAULIC FLUID AND FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LOADER LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SERVICE INTERVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TIRES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TRANSMISSION & DRIVE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–1––1–

1–8 1–3 1–4 1–1 1–7 1–2 1–6 1–5

Page Number 1–13 1–4 1–11 1–1 1–13 1–3 1–12 1–12

730, 731, 732 Loader Service Manual

1 PREVENTIVE MAINTENANCE Loader Serial Number

1–1 INTRODUCTION 1–1.1 Symbols

IMPORTANT

This notice identifies important procedures which must be followed to prevent damage to the loader.

B–02674R

WARNING

This safety alert symbol indicates important safety messages in this manual. Be alert to the possibility of personal injury and carefully read the message that follows this symbol.

Fig. 1–1

Loader Serial Number

Fig. 1–2

Engine Serial Number (730)

Fig. 1–3

Engine Serial Number (731)

Fig. 1–4

Engine Serial Number (732)

1–1.2 Serial Number Identification It is important to make correct reference to the serial number of the loader when making repairs or ordering parts. It is possible that the present machines do not use all the same parts as earlier machines; or it is possible that different procedures are used for service or repair.

B–02120

1–1.3 Loader Serial Number The loader serial number plate location is on the inside of the left upright, above the grill (Fig. 1–1).

Explanation of serial number: XXXX

M

XXXXX Production Sequence (Series) Plant Location B–02249

Model, Engine Version

1–1.4 Engine Serial Number 730 Wisconsin: (Fig. 1–2) The engine serial number location is on the engine shroud on the left side of engine. Use all numbers when ordering parts for this engine.

731 Deutz: (Fig. 1–3) The engine serial number location is on the right side of cylinder block. Use all numbers when ordering parts for this engine.

732 Ford: (Fig. 1–4) The engine serial number location is on the right side of the valve cover. Use all numbers when ordering parts for this engine.

–1–1–

B–02796

730, 731, 732 Loader Service Manual

1–1.5 Pre–Delivery Inspection The purpose of the pre–delivery inspection is to make sure that the loader is in correct operation condition when it comes to the dealer and before delivery to the customer.

The pre–delivery inspection also lets the factory know when something is wrong with the loader so that the problem can be corrected and prevented in the future.

All items on the inspection form (Fig. 1–5) must be completed according to specifications in this manual.

Fig. 1–5

Pre–Delivery Inspection

Fig. 1–6

30–Hour Inspection

One copy of the completed form is to be mailed to:

CLARK EQUIPMENT COMPANY MELROE DIVISION–SERVICE DEPT. GWINNER, NORTH DAKOTA 58040

The other copy is for the dealer.

1–1.6 30 Hour Inspection The 30–hour inspection must be completed soon after the first 30 hours of operation.

The purpose inspection is:

of

the

30–hour

1. For adjustment and inspection after first work period.

2. To correct wrong maintenance and operating methods.

3. For demonstration of correct service procedures to customer.

All items on the 30–hour inspection form (Fig. 1–6) must be completed by the dealer’s mechanic, according to specifications in this manual.

When the 30 hour inspection has been completed, the form must be signed by (1) the mechanic that completed the inspection, (2) the dealer, and (3) the owner or operator.

One copy of the completed form is to be mailed to: CLARK EQUIPMENT COMPANY MELROE DIVISION–SERVICE DEPARTMENT GWINNER, NORTH DAKOTA 58040 One copy is for the owner and one copy is for the dealer.

–1–2–

730, 731, 732 Loader Service Manual

1–2 SERVICE SCHEDULE Maintenance work must be done at regular intervals. Failure to do so will result in damage to the Bobcat loader or the engine. The service schedule is a guide for correct maintenance of the Bobcat loader. DO NOT change this service schedule unless the frequency of service is increased when the Bobcat loader is operated in very hot, cold, dusty or corrosive conditions.

MODEL

DO NOT work on the loader with the lift arms in a raised position without support. Use the lift arm stops or other methods.

SERVICE SCHEDULE ITEM

730 731 732

SERVICE REQUIRED

HOURS 8–10

50

100 250 300

500 1000

Engine Air Cleaner

Clean dust cup. Check condition of system. Check condition indicator.

Engine Cooling System Check coolant level. Add coolant when level is low.

Remove debris from the radiator grill area.

Tires Check air pressure & check for damage.

Wheel Nuts Tighten nuts 115 ft.–lbs. (155 Nm) torque.

Engine Oil Check and add oil as needed.

All Pivot Points Add lubricant to all fittings.

Engine Cooling Inlet Check rear door grill & blower inlets for restriction of air flow. Clean cooling fins & blower housing when necessary.

Indicators, etc.

Check for correct operation of all.

Operator Cab Check condition of cab & bolts Seat Belt Check condition of strap, buckle & replace if damaged.

Hydraulic Fluid Check & add recommended fluid as needed.

Safety Signs (Decals) Check for damaged decals or decals that are gone.

Replace as needed.

Engine Oil & Filter Change the oil & the filter.

Control Pedals & Steering Add grease to fittings until extra grease shows.

Battery Check water level & cables.

Hydraulic Tubes & Hoses Check for damage or leaks. Replace as needed.

V–Belts Check tension & make adjustments.

Crankcase Breather Clean breather cap every oil change.

Bob–Tach Check locking levers & wedges for condition & operation.

Parking Brake Check operation & adjust as needed.

Chaincase Fluid Check fluid level & add as needed.

Hydraulic Filter Make replacement of filter element.

Engine Cylinder Head Bolts Tighten to correct torque after first 100 hours & adjust the valves as needed.

Engine Air Cleaner Check system for leaks. Replace element when condition indicator shows red.

Crankcase Breather Remove breather & clean.

Governor Check oil level in the reservoir.

Main Frame Upright Check the torque of the bolts that hold the transmission assembly to the upright.

Steering Lever Pivots Grease pivot points.

Spark Arrestor Muffler Remove the plug & clean the spark chamber.

Engine Fuel Filter Replace the filter element.

Starting Motor Remove, clean & service as needed.

Engine Fuel Filter (Inline) Replace the element.

Main Fuel Filter Make replacement of the element. Vent air from the fuel system after changing element.

40 Micron Filter Replace the filter in the port block.

Universal Joint Grease u–joint Engine Compression The minimum compression reading must be at least 75% of maximum compression reading.

Chaincase Make replacement of fluid.

Hydraulic System Make replacement of fluid & filter. Replace cap.

Revised Aug. 83

–1–3–

730, 731, 732 Loader Service Manual

1–3 ENGINE SERVICE (General)

1–3.1 Engine Oil and Filter (Fig. 1–7 thru Fig. 1–10) Oil Fill Cap Oil Specification:

730 and 732: Use a good quality oil which has API Service Classification SE. 731: Use a good quality oil which has API Service Classification CC or CD. Use oil of correct SAE viscosity for temperature conditions at the time of starting; not for the highest temperature expected during the working day.

Engine Oil Filter Drain Plug Fig. 1–7 Engine Servicing (730)

C–02256

Oil Fill Cap Dipstick

Oil Filter B–03963 B–03965

Fig. 1–8 Revised Nov. 83

Engine Servicing (731)

–1–4–

730, 731, 732 Loader Service Manual

RECOMMENDED SAE VISCOSITY NUMBER (LUBRICATION OILS FOR ENGINE CRANKCASE) C°–34 –29

–23 –18

–13

–7

–1

+4

+10 +15

+21

+27 +32 +38

+43

+49

Dipstick

+54 +60

SAE 10W–30–40

SAE 15W–40

Oil Fill SAE 5W–30

Minimum

SAE 30W

SAE 20W–20

SAE 10W

Maximum ⎧°–30 –20

–10

0

+10

+20 +30

+40 +50 +60

+70

+80 +90 +100 +110 +120 +130 +140

TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE (GASOLINE: USE API CLASSIFICATION SE) (DIESEL: USE API CLASSIFICATION CD)

B–02335

Fig. 1–9

B–02663R Checking Crankcase Oil (732)

Oil Filter Crankcase Drain

Checking Oil: Engine must be stopped to check oil level. Check oil level every 4 hours for the first 50 hours of operation. After the first 50 hours of operation, check oil level every day (8–10 hours). Oil level must be kept between the “MIN” and “MAX” marks on the dipstick.

B–02658

Fig. 1–10

Adding Oil:

Engine Oil Filter Location (732)

Remove oil fill cap and add enough oil of the correct specification and viscosity to make oil level near the “MAX” on the dipstick.

Replacement Oil and Filter: 1. Stop the engine.

2. Remove the drain plug when engine is hot.

3. Let oil flow for several minutes.

4. Remove filter.

5. Install drain plug.

6. Clean area around filter base.

7. Put clean oil on gasket of new filter and install new filter. Tighten filter by hand only.

8. Fill with 4 quarts (3,79 l) of oil of the correct specification and viscosity.

–1–5–

730, 731, 732 Loader Service Manual

1–3.2 Crankcase Breather 730 Wisconsin: The crankcase breather is a closed system. The breather system must be cleaned every 500 hours.

Breather Cap

732 Ford: (Fig. 1–12) The crankcase breather is also the oil fill cap. Clean the breather cap with solvent every time you replace engine oil.

731 Deutz: (Fig. 1–11) The crankcase breather is located on the right side of cylinder block. Clean the breather assembly every 500 hours.

1–3.3 Air Cleaner System

A–01601

Fig. 1–11

Crankcase Breather (731)

The air cleaner system must be kept clean and free from defects for good engine performance and long service life.

B–02677

Fig. 1–12

Service air cleaner as follows:

Crankcase Breather (732)

1. Remove and clean dust cup every day (Fig. 1–13).

2. Do not remove element unless replacement is necessary.

(When condition indicator shows red.)

Gasket Element

NOTE: Be sure (1) gasket surfaces are clean before installing new element and (2) be sure gasket is in correct place.

Rubber Baffle

3. Inspect complete air cleaner system and make replacement of any parts with defects. Be sure hose connections are tight.

4. Check running operation of air cleaner system as follows: a. Start engine and run at idle.

Dust Cup Fig. 1–13

C–01024R

Air Cleaner Assembly

b. Close air inlet on air cleaner. The engine speed must become slower then stop. c. If the engine does not stop, the system has a leak. Inspect, and make repairs as necessary.

1–3.4 Fuel System (730, 732) Use only “regular” gasoline with an octane rating of 90–94. DO NOT USE UNLEADED GASOLINE.

Fuel Cap

1. Engine must be stopped, ignition off and engine cool before putting fuel in tank.

2. Remove fuel cap (Fig. 1–14) and fill tank with clean fuel using an approved safety container.

3. Put fuel in the tank ONLY when the machine is in a large open area (outside or a large building).

WARNING

DO NOT put fuel in tank while near open flames or sparks. DO NOT SMOKE while putting fuel in tank.

B–02654R

Fig. 1–14 –1–6–

Fuel Filling Location

730, 731, 732 Loader Service Manual

4. Use only clean fuel.

5. Install fuel cap after filling. Be sure cap is tight.

Filter Element

Fuel Filter (Inline) A fuel filter is located on the right side of the machine near the fuel tank outlet (Fig. 1–10).

The fuel filter must be checked every 300 hours.

To check or make replacement of fuel filter: 1. Turn fuel valve off (Fig. 1–15).

2. Loosen hose clamp and remove hose from inlet end of fuel filter.

Valve

3. Connect a short piece of hose to the outlet end of fuel filter and turn fuel valve on.

B–02191R

4. If fuel goes through the filter, it does not need replacement. If fuel does not go through filter, make replacement.

Fig. 1–15

Fuel Filter and Valve (730, 731)

5. When installing new fuel filter, loosen both hose clamps to remove filter.

6. Install fuel filter with arrow toward carburetor (Fig. 1–15) and be sure fittings are tight.

1–3.4a Fuel System (731) See Section 7 for 731 fuel system maintenance.

Fuel Pump 730: The fuel pump is located on top of the cylinder block and under the intake manifold. Repair parts are not available for the fuel pump. If the fuel pump does not operate correctly, replacement must be made.

Idle Adjustment Needle

Throttle Stop Screw

732: The fuel pump is located on the left side of the engine above the starter. Repair parts are not available for the fuel pump. If the fuel pump does not operate correctly, replacement must be made.

Carburetor 730: The carburetor is located in the center of the engine on top of the intake manifold.

732: The carburetor is located on the left side of the engine, above and behind the fuel pump. Repair kits are available for the carburetor.

730: Carburetor Adjustment (Fig. 1–16).

Adjust the idle screw for the best low speed operation.

The engine must idle at 1125 to 1150 RPM. Repair kits are available for this carburetor.

C–02319

Fig. 1–16

Carburetor Adjustment (730)

–1–7–

730, 731, 732 Loader Service Manual

732: Carburetor Adjustment (Fig. 1–17) The only adjustments to the carburetor are: (1) idle adjusting needle and (2) throttle idle adjustment.

Idle Adjusting Needle 1. Turn needle all the way in. DO NOT use force, it will cause damage to the needle.

2. Turn the needle out (counterclockwise) about 1–1/2 turns, then start engine.

Idle Adjustment Needle

3. If engine does not run smoothly, turn needle out until it does.

A–02499

Fig. 1–17

Carburetor (732)

Throttle Idle Adjustment 1. Start the engine.

2. Hold governor speed change lever against the stop.

Cap

3. Make adjustment to throttle idle screw until engine runs 750–850 RPM.

1–3.5 Engine Cooling System 730 and 731: These engines are cooled with air. Be sure cooling fins on cylinder heads are kept clean.

732: Check coolant level at the coolant recovery tank (Fig. 1–18). The tank must be 1/3 full when cold. Also, when engine is cold, check to see that radiator is full.

B–02672R

Fig. 1–18

Coolant Recovery Tank

Do not remove radiator cap when engine is hot.

W–2011–1285

Removing Coolant From System (732)

1/2” (12,7 mm)

1. Disconnect wire from temperature switch.

2. Remove the temperature switch located on the right side of the engine block.

3. After all coolant has come out, install switch and connect wire to switch.

Revised Nov. 83

B–03965

Fig. 1–19

Belt Tension Adjustment (731)

–1–8–

730, 731, 732 Loader Service Manual

1–3.6 Engine Electrical System (730, 731 & 732)

1/2” Movement

The Bobcat has a 12 volt, negative ground, alternator charging system.

General service of the electrical system is as follows: 1. The factory battery is maintenance free. Batteries that are not maintenance free must have electrolyte checked every 50 hours.

1/4” Movement

2. Check battery cables to see that both are clean and tight. Remove corrosion with soda and water solution. Put grease on cable ends to prevent further corrosion.

B–02661

Fig. 1–20 Belt Tension Adjustment (732) 3. a. 730: The 730 Bobcat has a flywheel type alternator. Check wires for damage condition. b. 731, 732: Check alternator belt tension. Make adjustment for belt movement with 5 lbs. (2,27 kg) force (Fig. 1–19 & Fig. 1–20) as shown. c. 732: Check governor belt tension. Make adjustment for belt movement with 5 lbs. (2,27 kg) force (Fig. 1–20) as shown.

4. The 730, 731, 732 Bobcats have two fuses located in the instrument panel (Fig. 1–21).

If any fuse is bad, it is caused by an overload in the electrical system. Check for a broken wire or broken insulation.

Using extra battery as an aid in starting: If it is necessary to use an extra battery as an aid in starting, it must be correctly connected to the Bobcat electrical system as follows:

WARNING

Protect eyes, skin and clothing from ACID.

1. Fasten one end of cable to positive (+) connector of Bobcat battery.

2. Fasten the other end of the same cable to positive (+) connector of extra battery.

3. Use second cable and fasten one end of the negative (–) connector of extra battery.

4. Fasten the other end of second cable to engine block. Fasten to block as far away from battery as possible to prevent sparks near battery.

WARNING

DO NOT USE AUTOMATIC TRANSMISSION FLUID!

–1–9–

730, 731, 732 Loader Service Manual

Front Lights

Light Switch

Transmission Warning Light Rear Light

Key Switch

Fuses Engine Warning Light

Voltmeter

Hour Meter

Fuel Gauge

Fuel Sender Switch

E–01240

Fig. 1–21

ROPS Electrical System

–1–10–

730, 731, 732 Loader Service Manual

Installing New Battery 1. Remove battery cables.

2. Mark cables for correct installation on new battery.

3. Thoroughly clean new battery connectors and ends of cable.

4. Put new battery in same position as old one was in. Fasten battery in place.

5. Be sure cable ends do not touch anything except battery connectors.

6. Tighten cables.

Upper Check Valve

NOTE: Connect ground cable (–) last to avoid sparks.

1–3.7 Ignition System (730 & 732) The basic items of the ignition system are coil, distributor and spark plugs.

Lower Check Valve

Every 200 hours, check condition of points and make replacement of spark plugs.

Fig. 1–22

B–02673

Checking Hydraulic Fluid

Making Adjustment of Spark Plug Gap 1. Remove wires from spark plugs.

2. Remove spark plugs.

3. Remove carbon deposits from spark point.

4. Set spark plug gap. See Section 8 for correct gap.

5. Install spark plugs and wires.

Making Adjustment of Point Gap 1. Turn engine until rubbing block is on high point of cam.

2. Put correct thickness feeler gauge (See Section 8–Technical Data) between contact points.

3. Loosen adjustment screw. Move breaker arm contact until correct gap is given. Tighten screws again.

1–4 HYDRAULIC FLUID AND FILTER Fluid Check level of hydraulic fluid every 50 hours (Fig. 1–22).

1. Lower the lift arms and tilt the Bob–Tach backwards. Stop the engine.

2. Turn lower check valve counterclockwise.

3. If hydraulic fluid comes from valve, fluid level is satisfactory.

4. If fluid does not come from valve, turn lower valve clockwise until tight. Turn upper valve counterclockwise and fill reservoir (See below for oil specifications. DO NOT OVERFILL.) until fluid comes from upper valve.

Turn valve clockwise until tight.

Use only SAE 10W–30 or 10W–40 oil which has an API classification of SE.

IMPORTANT Revised Dec. 96

DO NOT USE AUTOMATIC TRANSMISSION FLUID!

–1–11–

730, 731, 732 Loader Service Manual

Filter Make replacement of hydraulic filter every 100 hours.

1. Remove hydraulic filter (Fig. 1–23).

2. Thoroughly clean surface where filter gasket will make contact.

Oil Filter

3. Put clean oil on gasket of new filter.

4. Install new filter and tighten hand tight.

5. Start the engine and inspect for leaks.

B–02665

Fig. 1–23

1–5 TRANSMISSION AND DRIVE SYSTEM

Hydraulic Oil Filter

Drive Chains The drive chains need replacement only when one becomes broken. (See 4–1.2 for replacement of drive chains.)

Brakes Check brakes for correct operation every 50 hours.

Make adjustment to brakes as follows: (Fig. 1–24) 1/4” Spacer Tool

1. Put brake pedal in open position.

2. Check pedal and linkage for freeplay.

3. There must be 1/4” (6,35) of freeplay between the spacer and the nut at the rear end of linkage (Fig. 1–27). See Section 4 for brake pad replacement and complete installation of brakes.

Fluid

C–02366

Check transmission fluid level every 100 hours.

Fig. 1–24

Brake Linkage Adjustment

1. Put Bobcat on a level surface.

2. Remove check plug (Fig. 1–25) located at the front of the transmission housing.

3. If fluid does not come out of check hole, add fluid through hole until it comes out.

NOTE: See Page 1–11 for correct transmission fluid.

4. Install check plug.

Make replacement of transmission fluid every 1000 hours.

1–6 TIRES Check tires regularly for wear, damage and correct pressure. (Correct pressure to 45–50 psi (310–340 kPa).

Plug C–02037

Fig. 1–25 –1–12–

Chaincase Check Fill Plug

730, 731, 732 Loader Service Manual

Tire Rotation Tire rotation is necessary to be sure of even wear. Make tire rotation from front to rear, rear to front as shown in figure 1–26.

CHAIN CASE

HYDRAULIC RESERVOIR

When new tires are installed, install two new tires at the same time and put both on the same side of Bobcat.

DO NOT put fluid (ballast) in the tires on this loader.

TRANSMISSION OIL FILTER

GREASE

COOLANT

GREASE

C–01965R

Fig. 1–26

Tire Rotation

Check wheel bolts regularly and make sure all are tight. (See Section 8 for torque specifications.)

6557316

Fig. 1–27

Lubrication Points

Fig. 1–28

Seat Rail Lubrication

Fig. 1–30

Pivot Pin Lockbolts

1–7 LOADER LUBRICATION Regular lubrication of the loader is important for good performance. Make lubrication at intervals according to 1–2 “SERVICE INTERVALS” on Page 1–3.

Figure 1–27 shows the location of grease fittings on the 730 series Bobcat.

Use a good quality lithium based, multi–purpose grease.

Also put lubricant on the seat rails (Fig. 1–28).

1–8 BOB–TACH AND PIVOT PINS

B–02135R

The Bob–Tach must be checked regularly for condition and wear (See 1–2 “SERVICE INTERVALS” on page 1–3).

When levers are in “locked” position (Fig. 1–29), the wedges must go through the holes in the frame of the attachment.

Make replacement of bent or broken wedges.

All pivot points (Lift arm, Bob–Tach and cylinders) use pins which are held in place by lockbolts (Fig. 1–30).

Check lockbolt nuts to be sure all are tight.

D–01380

Fig. 1–29

Bob–Tach

–1–13–

A–02659

730, 731, 732 Loader Service Manual

1–9 THE ENGINE MUFFLER The muffler on the engine of the 730 loader (S/N 12002 & Below) can come loose, because there is a failure of the studs at the manifold. Replace the studs and nuts which fasten the muffler to the manifold (Fig. 1–31, Items 1 & 2). Tighten the nuts to 14–18 ft.–lbs. (19–24 Nm) torque. (See the Parts Book or Microfiche for the correct part number).

2 1

E–01179

Fig. 1–31

Added June 79

–1–14–

Engine Muffler Installation

730, 731, 732 Loader Service Manual

HYDRAULIC SYSTEM Paragraph Number CONTROL PEDAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

HYDRAULIC CONTROL VALVE . . . . . . . . . . . . . . . . . . . . . . . .

HYDRAULIC/HYDROSTATIC RESERVOIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

HYDRAULIC PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

HYDRAULIC SYSTEM INFORMATION . . . . . . . . . . . . . . . . . .

LIFT CYLINDERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OIL COOLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10 MICRON FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TILT CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page Number

2–10 2–3

2–33 2–3

2–7 2–4 2–2 2–5 2–8 2–9 2–6 2–1

2–31 2–15 2–2 2–19 2–32 2–33 2–25 2–1

HYDRAULIC SYSTEM

Instructions are necessary before doing maintenance and specified service on this loader. See all instructions and warnings in the manual. Check warnings at the beginning of the preventive maintenance section. After doing service always check for correct function of loader.

WARNING

Safety glasses or goggles are always needed for eye protection from electric arcs from shorts or welding, battery acid, compressed springs, fluids under pressure, and flying debris or loose material when engines are running or tools are used. Use eye protection approved for type of welding. Failure to obey warnings can cause injury or death.

W–1006

WARNING

Diesel fuel or hydraulic fluid under pressure can penetrate the skin or eyes.

Fluid leaks under pressure may not be visible. Use a piece of cardboard or wood to find leaks but do not use bare hand.

Wear safety goggles. If fluid enters skin or eyes, get immediate medical attention.

W–1035

Revised Nov. 83

–2––1–

730, 731, 732 Loader Service Manual

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