Komatsu WA600-8 Operation & Maintenance Manual page 435

MAINTENANCE
17. Remove the bolts (11) (4 pieces) and remove cover (12).
18. Pull out strainer (15) together with rod (13) and spring (14).
19. Remove any dirt stuck to strainer (15), then wash it in
flushing oil.
If strainer (15) is damaged, replace it with a new one.
20. Install the rod (13), spring (14), strainer (15), and cover
(12) to the tank.
At this time, be sure to replace the O-ring of cover (12)
with a new one.
21. Check through the mounting hole of cover (12) that the
guide pin of strainer is inserted to the guide hole, and in-
stall cover (12).
22. Refill with the specified quantity of hydraulic oil through oil
filler port (F), then install the cap.
23. Check the hydraulic oil level.
Check that it is at the specified level. For details, see
"METHOD FOR CHECKING OIL LEVEL IN HYDRAULIC
TANK, ADDING OIL (4-47)".
24. Start the engine.
25. Bleed air from the steering cylinder according to the following procedure.
1)
Run the engine at low idle, and operate the steering cylinder to around the stroke end 4 to 5 times.
2)
Run the engine at high idle, and operate the steering cylinder to around the stroke end 4 to 5 times.
26. Bleed air from the steering cylinder of bucket and boom according to the following procedure.
1)
Run the engine at low idle, and operate each cylinder of bucket, and boom to approximately 100 mm
before the stroke end 4 to 5 times.
NOTICE
If the engine runs 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)
Run the engine at high idle and operate each cylinder of bucket, and boom to approximately 100 mm
before the stroke end 4 to 5 times.
3)
Run the engine at low idle, and operate each cylinder of bucket, and boom to the stroke end 4 to 5
times.
27. Stop the engine, then loosen air bleeding plug (2).
28. After bleeding air from the hydraulic tank, tighten plug (2).
29. Check the hydraulic oil level.
Check that it is at the specified level. For details, see
"METHOD FOR CHECKING OIL LEVEL IN HYDRAULIC
TANK, ADDING OIL (4-47)".
30. Start the engine and run it at low idle.
31. Loosen air bleeding plug (2).
Bleed air from the filter tank.
32. Increase the engine speed and bleed air according to step 25 to 28.
Repeat this work until no air is discharged from plug (2).
33. After bleeding air, tighten plug (2).
Tightening torque: 11.3±1.47 Nm {1.15±0.15 kgm}
34. Check the hydraulic oil level.
MAINTENANCE PROCEDURE
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