.
MAINTENANCE
MAINTENANCE PROCEDURE
BLEEDING AIR FROM HYDRAULIC SYSTEM
For details, see "STARTING ENGINE (PAGE 3-133)". If it is necessary to refer to the items for starting the engine,
moving the machine off, steering, or stopping, see the OPERATION section.
1.
Bleeding air from pump
NOTICE
If the pump is operated without filling the pump case with hydraulic oil, there is danger that the pump may be prematurely
damaged. Be sure to bleed the air completely.
1)
Open the pump room door on the right side of the machine.
2) Loosen air bleed plug (1) installed to the drain port and
check that oil oozes out.
3)
After completion of the air bleeding operation, tighten the
air bleed plug (1).
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.
2. Starting engine
Start the engine, referring to "STARTING ENGINE (PAGE 3-133)".
Run the engine at low idle for 10 minutes after starting, then start operations.
3. Bleeding air from cylinders
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 approx. 100 mm (3.9 in) short of its stroke end)
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.
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