
MA0886RHG
26
8. Malfunction and Countermeasures
8-1. In the case of malfunction
Check the points specified below again and take measures.
Table 8
Defective
Measures
Piston
Operation
Inability
Check that the hydraulic pressure is operating by the motion of the flexible hose, etc.
Check that there are no mistakes in piping.
Try operations when operation inability specified in the items of the trial operation.
Cylinder
Thrust Force
Insufficiency
Check that the pressure is as specified at the cylinder pipe inlet by attaching a pressure
gauge near the inlet of the cylinder.
Wearing of the O-ring inside is possible when the flow rate of the returning side pipe or the
drain is more than usual.
Temperature
Rise
Check that the viscosity of the hydraulic oil is as designated.
Replenish the hydraulic oil inside the tank if it is low.
When the room temperature is high and the radiation effect of the tank is bad, control the
oil temperature using a cooler or a fan, etc.
Pump noise
Do not suck air.
Replenish the hydraulic oil inside the tank if it is low.
If a large amount of dirt is deposited inside the tank, or when the hydraulic oil is
deteriorated, the pump may be worn out abnormally, and it will be necessary to repair the
pump.
Oil leakage
from oil seal
Provide a stream slope, without air pockets, and no back pressure must be applied.
Return the drainage onto the surface of the oil of the hydraulic unit .
Check that the air breather of the hydraulic unit is not clogged.