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11. BLEEDING AIR FROM HYDRAULIC SYSTEM
For details, see “Operation 3.3 Starting Engine”. If it is necessary to refer to the items for starting the
engine, moving the machine off, steering, or stopping, see “Operation 3.8 Starting/moving/stopping
Machine” and “3.9 Steering Machine”.
[1] BLEEDING AIR FROM PUMP
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).
4. Start the engine, and then run the engine at low idle for 10
minutes after starting, then start operations.
[2] BLEEDING AIR FROM CYLINDERS
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 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 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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