Komatsu D37EX-24 Operation & Maintenance Manual page 312

MAINTENANCE PROCEDURE
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 bleeder (3) installed to the drain port
and check that oil oozes out from it.
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.
For starting the engine, see "METHOD FOR START-
ING ENGINE (3-150)".
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 hydraulic tank are discharged.
4.
Check that there is no leakage of oil and wipe off any oil that is spilled.
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MAINTENANCE