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MAINTENANCE
METHOD FOR BLEEDING AIR FROM HYDRAULIC CIRCUIT
Bleeding air from pump
Perform it when any hydraulic component or oil is replaced.
NOTICE
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. Bleed air securely.
1.
Run the engine at low idle.
2.
Open the engine hood.
3.
Loosen air bleeder (1) installed to the pump and check that
oil oozes out from the air bleeder.
4.
After bleeding air, tighten air bleeder (1).
Bleed air from between pump and hydraulic tank
Perform it when any hydraulic component or oil is replaced.
NOTICE
If you run the engine at high speed without bleeding air from the piping between the pump and hydraul-
ic tank, the pump may heat abnormally and may be broken in a short period.
1.
Start and run the engine at medium speed.
2.
Operate the work equipment slowly for approximately 5 minutes, and bleed air.
Bleed air from LS circuit
Perform it only when a hose of the pump, valve, or LS circuit is replaced.
NOTICE
If you do not bleed air from the LS circuit, the work equipment may malfunction.
1.
Loosen air bleeder (2) installed to the LS port of the pump.
2.
Run the engine at low idle for 2 minutes.
3.
Perform the bucket operation (DUMP and CURL to each
stroke end) for approximately 2 minutes.
4.
After bleeding air, tighten bleeder (2).
Bleeding air from cylinders
Perform it when any hydraulic component or oil is replaced.
NOTICE
If the engine is run at high speed immediately after startup or a cylinder is pushed up to its stroke end,
air taken inside the cylinder may cause damage to the piston packing.
1.
Run the engine at medium speed.
2.
Move each cylinder to approximately 100 mm before the stroke end, and repeat the operation 4 to 5 times.
Take care not to move the cylinder to the stroke end.
3.
Operate each cylinder 3 to 4 times to each stroke end.
WENAM00241
MAINTENANCE PROCEDURE
RKA68860
RKA68870
4-41
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