NOTICE
Abnormal
heat will be generated if the pump is operated without filling the pump case with hydraul-
ic oil. It may cause a premature damage to the pump. Be sure to bleed the air.
1)
Remove the cap of oil filler port (F) at the top of the
hydraulic tank.
2)
Remove the floor mat (1) and floor plate (2).
3)
Loosen the air bleeders (3) and (4) installed to the
drain port and check that oil oozes out from them.
4)
After bleeding air, tighten the air bleeder (3).
Tightening torque: 11.8 to 14.7 Nm {1.2 to 1.5 kgm}
5)
Close the cap of oil filler port (F) at the top of the hy-
draulic tank.
2.
Bleed air from the cylinder according to the following pro-
cedure.
NOTICE
If
the engine runs at high speed immediately after the
startup, or if a cylinder is pushed up to its stroke end,
the air mixed into the cylinder may cause damage to
the piston packing, etc.
1)
Start the engine.
2)
Run the engine at low idle.
Keep
the engine running at low idle for 10 minutes af-
ter starting, and then start the following work.
3)
Operate each cylinder of the work equipment to ap-
proximately 100 mm before the stroke end 4 to 5
times.
At this time, take care not to operate the cylinder to
the stroke end.
4)
Run the engine at high idle (max. speed).
5)
Operate each cylinder of the work equipment to ap-
proximately 100 mm before the stroke end 4 to 5
times.
At this time, take care not to operate the cylinder to
the stroke end.
6)
Run the engine at low idle and operate each cylinder 4
to 5 times to the stroke end to bleed the air complete-
ly.
3.
After completing the air bleeding, stop the engine, leave
the machine as it is for at least 5 minutes, and then start
the operation.
The air bubbles in the oil inside the tank are discharged.
4.
Check that there is no leakage of oil and wipe off any oil that is spilled.
MAINTENANCE MAINTENANCE PROCEDURE
4-39
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