The actuator (cylinder) is not in working order
1. Knocking is caused by air in the working fluid.
Remove the air from the fluid.
2. Knocking is caused by packing resistance.
Apply molybdenum disulfide coating to the piston or replace the packing.
3. Knocking is caused by the bump at the load side.
Perform the centering of the actuator and make the load line smooth.
4. Knocking is caused by a poor condition of the inner surface of the tube.
Repair the tube.
5. Knocking is caused by improper operation of the control valve.
Inspect and eliminate the failure cause.
6. Air in the working fluid causes thrust reduction.
Remove the air from the fluid.
7. Insufficient pressure causes thrust reduction.
Inspect and eliminate the failure cause.
8. Internal leakage causes thrust reduction.
Repair the failure (replace the packing).
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