Komatsu WA800-3E0, Руководство по эксплуатации и техническому обслуживанию

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SERVICE PROCEDURE
MAINTENANCE
4-38
BLEEDING AIR FROM HYDRAULIC CIRCUIT
1. Check that the hydraulic oil in the hydraulic tank is at the specified level.
2. Run the engine at low idle, and extend and retract the steering, bucket, and lift arm cylinders 4 to 5 times. Be
careful not to operate the cylinder to the end of its stroke (stop approx. 100 mm before the end of stroke).
3. Next, operate the steering, bucket, and lift arm cylinders to
the end of their stroke 3 to 4 times, then stop the engine
and loosen air bleed plug (1) to bleed the air from the
hydraulic tank. After bleeding the air, tighten plug (1) again.
4. Check the hydraulic oil level and ensure that is correct,
Refer to “CHECK OIL LEVEL IN HYDRAULIC TANK, ADD
OIL (4-47)“.
5. Increase the engine speed, and repeat step 3 to bleed the
air until no more bubbles come out from plug.
If the engine is run at high speed at first, or if the cylinder is
moved to the end of its stroke, the air in the cylinder may
damage the piston packing, etc.
6. After completing the air bleed operation, tighten plug (1).
Tightening torque: 9.83 to 12.77 Nm (1.0 to 1.3 kgm)
7. Check the hydraulic oil level and ensure that is correct, Refer to “CHECK OIL LEVEL IN HYDRAULIC TANK,
ADD OIL (4-47)“.