1.
Apply the parking brake.
2.
Operate the boom control lever to RAISE position (a) to
raise the work equipment.
3.
Raise the work equipment to the upper end and operate
the boom control lever to HOLD position (b).
4.
Stop the engine.
5.
Turn the starting switch to ON position.
6.
Press the work equipment lock switch and unlock the work
equipment (the work equipment lock pilot lamp goes out).
7.
After checking safety around the machine, operate the
boom control lever to FLOAT position (d) and lower the
work equipment to a position 1 m from the ground.
8.
After the work equipment is lowered to a position 1 m from
the ground, return the boom control lever to LOWER posi-
tion (c) and lower the work equipment gradually to the
ground.
If the work equipment stops halfway, the accumulator gas
pressure may be low.
Ask your Komatsu distributor for inspection.
Replace the accumulator for every 4000 hours or every 2 years whichever comes sooner.
METHOD FOR CHECKING ALTERNATOR
Ask your Komatsu distributor for check of the alternator every 2000 hours or every 1 year, whichever comes
sooner.
METHOD FOR CHECKING AND ADJUSTING ENGINE VALVE CLEARANCE
Special tools are necessary for inspection and maintenance. Ask your Komatsu distributor to perform this work.
METHOD FOR CHANGING OIL IN WORK EQUIPMENT PIN
(Only for the machine with sealed and lubricated pin)
WARNING
If the plug is loosened immediately after the operation, the oil may spurt out, so take care.
Items to be prepared
Container to catch drained oil
MAINTENANCE PROCEDURE MAINTENANCE
4-76
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