Galeo PC78MR-6, Operation & Maintenance Manual

Page: 243 / 295

.
MAINTENANCE
MAINTENANCE PROCEDURE
4. Bleeding air from cylinders
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 a mid-range speed (1650 rpm) and extend and retract the cylinders 4 to 5 times to a point
100 mm (3.9 in) from the end of the stroke. (Be careful not to operate to the end of the stroke.)
2) Next, 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.
5. Bleeding air from swing motor
(only after draining oil from swing motor case)
NOTICE
If the air is not bled from the swing motor, the motor bearings may be damaged.
1) Loosen hose (3) while keeping the engine running at low
idling. Tighten it again once oil starts to flow out. Do not
attempt to make a swing movement at that time.
2) Run the engine at low idling, and make a swing movement
slowly to the right and left more than twice each
6. Bleeding air from swing PPC circuit
Bleed air through air bleeder (4) installed to the main valve
inside the cover on the right side of machine.
7. Bleeding air from travel motor
(only when oil inside travel motor case has been drained)
1) Run the engine at low idling, remove hose (5) from port D,
then when the oil has flowed out, tighten it again.
4 - 48