SEBM014406
1
EXCEL MACHINE MODEL
SERIAL NUMBER
PC300-6 EXCEL PC300LC-6 EXCEL
33001 and up 33001 and up
•
This shop manual may contain attachments and optional equipment that are not available in your area. Please consult your local Komatsu distributor for those items you may require. Materials and specifications are subject to change without notice.
•
PC300-6 EXCEL mount the SAA6D108-2 engine. For details of the engine, see the 108-2 Series Engine Shop Manual.
© 2002 1 All Rights Reserved Printed in Japan 05-02(01)
00-1 6
CONTENTS No. of page
01
GENERAL ........................................................................ 01-1
10
STRUCTURE AND FUNCTION ...................................... 10-1
20
TESTING AND ADJUSTING .......................................... 20-1
30
DISASSEMBLY AND ASSEMBLY ................................. 30-1
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MAINTENANCE STANDARD ......................................... 40-1
90
OTHERS........................................................................... 90-1
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PC300-6 EXCEL
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PC300-6 EXCEL
TESTING AND ADJUSTING
TESTING AND ADJUSTING ALTERNATOR BELT TENSION TESTING AND ADJUSTING WATER PUMP BELT TENSION
TESTING AND ADJUSTING ALTERNATOR BELT TENSION
a Fan pulley
fl If the deflection of the belt when it is pressed at a point a midway between the alternator pulley and the fan pulley is not within the standard value, or after carrying out maintenance or replacing the belt, adjust the belt tension as follows. • Deflection of V-belt : 6 mm 1. Remove the upper fan guard of the alternator. 2. Tighten adjustment nut (3) until clearance of retainer (2) is eliminated. fl Do not tighten the adjustment nut further after the clearance is eliminated. 3. Tighten mounting bolt (1). 3 Mounting bolt: 53.9 – 122.5 Nm {5.5 – 12.5 kgm} 4. Tighten mounting bolt (5). 3 Mounting bolt: 98 – 122.5 Nm {10 – 12.5 kgm} 5. Tighten locknut (4). 6. After adjusting the belt tension, check again to confirm that the belt tension is within the standard value.
Alternator pulley
Crankshaft pulley BLP00310
TESTING AND ADJUSTING WATER PUMP BELT TENSION fl If the deflection of the belt when it is pressed at a point a midway between the water pump pulley and the fan pulley is not within the standard value, or after carrying out maintenance or replacing the belt, adjust the belt tension as follows. • Deflection of V-belt : 6 mm 1. Loosen mounting bolts (2) and locknut (3) of tension pulley (1). 2. Turn belt tension adjustment bolt (4) and move tension pulley (1) to adjust the tension of the belt. When the tension is adjusted, tighten mounting bolts (2). 3 Mounting bolt : 66.15 ± 7.35 Nm {6.75 ± 0.75 kgm} 3. Loosen adjustment bolt (4) 1/2 turns, then tighten locknut (3). fl To prevent the adjustment bolt from falling out, loosen the tension applied to the bolt. 3 Locknut: 30.87 ± 3.43 Nm {3.15 ± 0.35 kgm} 4. After adjusting the belt tension, check again to confirm that the belt tension is within the standard value.
PC300-6 EXCEL
a
Fan pulley Water pump pulley Tension pulley
Crankshaft pulley BLP00312
2
4
3
1
BLP00313
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TESTING AND ADJUSTING
TESTING AND ADJUSTING BELT TENSION FOR AIR CONDITIONER COMPRESSOR ADJUSTING ENGINE SPEED SENSOR
TESTING AND ADJUSTING BELT TENSION FOR AIR CONDITIONER COMPRESSOR
a Crankshaft pulley Air conditioner compressor pulley
1. Remove the upper fan guard of the air conditioner compressor. fl If the deflection of the belt when it is pressed at a point a midway between the drive pulley and the compressor pulley is not within the standard value, or when carrying out maintenance after replacing the belt, adjust the belt tension as follows. • Deflection of V-belt : 15 – 18 mm 2. Loosen mount bolt (1) and (2). 3. Move the position of compressor (3) to adjust the tension of the belt. 4. When the position of the compressor is fixed, tighten mount bolts (1) and (2) to secure in position. 5. After adjusting the belt tension, repeat the above procedure to check that the belt tension is within the standard value.
BKP00314
ADJUSTING ENGINE SPEED SENSOR 1. Screw in until the tip of sensor (1) contacts gear (2). 2. When gear (2) contacts sensor (1), turn back 1 ± 1/6 turns. 3. Tighten locknut (3). 3 Locknut : 58.8 ± 9.8 Nm {6 ± 1 kgm} fl Be particularly careful when handling the sensor wiring to ensure that no excessive force is brought to bear on the wiring. fl Be careful not to let the tip of the sensor be scratched or to let any iron particles stick to the sensor tip.
1 BLP00316
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1
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2 BLP00317
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PC300-6 EXCEL
TESTING AND ADJUSTING
TESTING AND ADJUSTING TRACK SHOE TENSION
TESTING AND ADJUSTING TRACK SHOE TENSION TESTING 1. Travel the machine forward by the length of track on ground, keeping the engine at low idling, and stop the machine slowly. 2. Place straight bar [1] on the track shoe between the idler and the 1st carrier roller. fl L beam is recommended for bar [1], because of its deflection-free nature. 3. Measure max. clearance a between bar [1] and the track shoe. • Max. standard clearance a: 10 – 30 mm ADJUSTING fl If the track shoe tension is not proper, adjust it in the following manner. 1 . When the tension is too strong Discharge grease by loosening valve (1). ¤ Do not loosen valve (1) by more than one turn, because grease will spurt due to its internal high pressure. 2 . When the tension is too weak Add grease through grease fitting (2). fl If the normal track shoe tension is not restored even after greasing, move the machine slowly back and forth.
PC300-6 EXCEL
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TESTING AND ADJUSTING
BLEEDING AIR
BLEEDING AIR Order for operations and procedure for bleeding air Air bleeding procedure
Air bleeding item
Nature of work
1
2
Bleeding air from pump
Start engine
• Change hydraulic oil • Clean strainer
3
4
5
6
Bleeding air from Bleeding air from Bleeding air from travel motor swing motor cylinder (note)
Start operations
(note)
• Replace return filter element • Replace, repair pump • Remove suction piping • Replace, repair control valve • Replace cylinder • Remove cylinder piping • Reoplace swing motor • Remove swing motor piping • Replace travel motor, swivel • Remove travel motor, swivel piping
Note: Bleed the air from the swing and travel motors only when the oil inside the motor case has been drained.
1. Bleeding air from pump 1) Loosen air bleed plug (1), and check that oil oozes out from the plug. 2) When oil oozes out, tighten plug(1). 3 Air bleed plug: 7.8 – 9.8 Nm {0.8 – 1.0 kgm} fl If no oil oozes out from the air bleed plug: 3) Leave plug (1) loosened and remove drain hose (2) and elbow (3). 4) Pour in oil through the elbow mount hole until oil oozes out from plug (1). 5) Fit elbow (3) and install drain hose (2). 6) Tighten air bleed plug (1). 3 Air bleed plug: 7.8 – 9.8 Nm {0.8 – 1.0 kgm} fl Precautions when starting the engine After completing the above procedure and starting the engine, run the engine at low idling for 10 minutes.
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