Every 4000 Hours Maintenance; Check Water Pump; Check Starting Motor; Replace Accumulator (For Control Circuit) - Komatsu PC450-8 Operation & Maintenance Manual

MAINTENANCE PROCEDURE

EVERY 4000 HOURS MAINTENANCE

Maintenance for every 50, 250, 500, 1000 and 2000 hours service should be carried out at the same time.

CHECK WATER PUMP

Since the pulley may have play, oil may leak, water may leak, contact your Komatsu distributor for inspection,
overhaul or replacement.

CHECK STARTING MOTOR

Contact your Komatsu distributor to have the starting motor checked.
If the engine is started frequently, have this inspection carried out every 1000 hours.

REPLACE ACCUMULATOR (FOR CONTROL CIRCUIT)

Replace the accumulator every 2 years or every 4000 hours, whichever comes sooner.
The accumulator is charged with high-pressure nitrogen gas, so mistaken operation may cause an explo-
sion, which will lead to serious injury or damage. When handling the accumulator, always do as follows.
The pressure in the hydraulic circuit cannot be completely removed. When removing the hydraulic equip-
ment, do not stand in the direction that the oil spurts out when carrying out the operation. In addition,
loosen the bolts slowly when carrying out the operation.
Do not disassemble the accumulator.
Do not bring it near flame or dispose of it in fire.
Do not make holes in it or weld it.
Do not hit it, roll it, or subject it to any impact.
When disposing of the accumulator, the gas must be released. Please contact your Komatsu distributor to
have this work carried out.
If operations are continued after the performance of the
accumulator has dropped, it will be impossible to release the
remaining pressure in the hydraulic circuit if there should be
a failure on the machine. Please ask your Komatsu distribu-
tor to replace the accumulator.
The accumulator is installed to the position shown in the dia-
gram on the right.
4-80
WARNING
MAINTENANCE
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