Komatsu PW98MR-10 Operation & Maintenance Manual page 336

MAINTENANCE PROCEDURE
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 (1,650 rpm).
2.
Operate the work equipment slowly for approximately 5 minutes, and bleed air.
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 (1,650 rpm).
2.
Extend and retract each cylinder 4 to 5 times, taking care that a cylinder is not moved to the stroke end.
(Stop the cylinder approximately 100 mm short of its stroke end)
3.
Operate each cylinder 3 to 4 times to each stroke end.
4.
Operate each cylinder 4 to 5 more times to each stroke end.
All air is bled.
Bleeding air from swing motor
Perform it only when the oil inside the swing motor case is drained.
NOTICE
If the air is not bled from the swing motor, the motor bearings may be damaged.
1.
Run the engine at low idle.
2.
Loosen hose (3). When oil flows out, tighten hose (3).
NOTICE
At this time, do not swing the upper structure.
3.
Run the engine at low idle and slowly swing at least 2
turns uniformly to the right and left.
Bleeding air from attachment (when installed)
Perform it when any hydraulic component or oil is replaced.
NOTICE
If the air bleeding procedure is specified on the attachment by the manufacturer, bleed the air according
to that procedure.
If a breaker or other attachment is installed, perform the air bleeding procedure until the air is completely bled
from the attachment circuit.
1.
Run the engine at low idle.
2.
Operate the attachment control switch repeatedly (approximately 10 times).
Air is bled.
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WENAM00061
MAINTENANCE