Komatsu WA250PT-5H, Operation & Maintenance Manual

Page: 217 / 255

MAINTENANCE
Service procedure
Every 250 hours service
4-43
Check parking brake 0.
Test conditions
Tire inflation pressure: as specified
Road surface: Dry paved surface with 25% grade
Machine: Operating condition
Test method
1. Start the engine and set the work equipment to the travel
posture.
2. Align the machine facing straight to the front, then drive the
machine up a 25% grade with the bucket empty.
3. Apply the brake to stop the machine, return the directional
lever to the neutral position ‚N', set the parking brake to the
LOCK position and stop the engine.
4. Release the brake pedal slowly and check whether the
machine is held in Stop position.
Check air conditioner compressor belt tension, adjust 0.
Checking 0.
1. Open the engine side cover on the left side of the chassis.
2. Standard deflection “a“ between air conditioner compressor
pulley (1) and fan pulley (2) when pressed with a thumb
(approx. 98 N (10 kg)) should be approx. 9.5 to 13.5 mm
(0.4 to 0.5 in).
When a belt tension gauge is used, the standard tension is
within a range of 353 to 549 N (36 to 54 kgf).
Check when changing the V-belt 0.
The standard deflection between the air conditioner compressor pulley and fan pulley when pressed with a thumb
(approx. 98 N (10 kgf)) should be approx. 7 to 10 mm (0.28 to 0.4 in).
When a belt tension gauge is used, the standard tension is within a range of 533 to 745 N (54 to 76 kgf).
REMARK
When the belt has been replaced with a new part, a high tension is necessary, so the initial tension is in
the value given above.
9EA04476-A
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