Table of Contents
Advertisement
MAINTENANCE PROCEDURE
The gas springs are located at the engine hood (2 places on
right and left sides).
In the following cases, ask your Komatsu distributor for inspection, repair, and replacement.
•
The engine hood is heavy to open.
•
Oil or gas is leaking from the gas spring.
METHOD FOR BLEEDING AIR FROM HYDRAULIC CIRCUIT
METHOD FOR BLEEDING AIR FROM PUMP
NOTICE
If the drain hose is installed first, oil will spurt out from bleeder (1) hole.
If the pump is operated without filling the pump case with hydraulic oil, abnormal heat will be generated
and this may cause a premature damage to the pump.
1.
Loosen air bleeders (1) (2 places) and check that oil oozes out from the air bleeder.
2.
If the oil does not ooze out, remove drain hose (2) from the
hydraulic pump case and fill the pump case completely
with hydraulic oil through drain port.
Oil will come out when the drain hose is removed, so se-
cure the hose fitting at a position higher than the level of
the oil in the hydraulic tank.
3.
After completing the air bleed operation, tighten air bleeder
(1) and install the drain hose.
METHOD FOR STARTING ENGINE
Start the engine according to OPERATION, "METHOD FOR STARTING ENGINE" and run it at low idle for 10
minutes, and then start the following work.
METHOD FOR BLEEDING AIR FROM CYLINDER
NOTICE
If the engine runs at high speed immediately after startup or a cylinder is operated to its stroke end, air
taken inside the cylinder may cause damage to the piston packing.
1.
Run the engine at low idle, and extend and retract each cylinder 4 to 5 times, taking care that a cylinder is
not moved to the end of its stroke (stop the cylinder approximately 100 mmshort of its stroke end).
2.
Operate each cylinder 3 to 4 times to the end of its stroke.
3.
Finally, operate each cylinder 4 to 5 times to the end of its stroke to completely remove the air.
METHOD FOR BLEEDING AIR FROM SWING MOTOR
NOTICE
•
When bleeding air, do not operate the swing.
•
If the air is not bled from the swing motor, the motor bearings may be damaged.
4-38
MAINTENANCE
Advertisement
Table of Contents
