69 “Translation of the original instruction”
6.2 System noise and vibration
Fault Description Method to repair
Oil tank level Low oil level causes cavitation in the tank Add proper amount of clean oil
oil vacuum
The air in the system reduces the
efficiency of components and controls.
Excessive noise, foam and overheating
indicate that there may be air in the
system
Find out where the air enters
the system and repair the leak.
Check that the inlet line is not
restricted and the diameter is
qualified
The cold oil is too viscous: the pump
produces suction
Rotate the oil through the
engine to the normal operating
temperature
Pump suction vacuum
High oil absorption vacuum will cause
excessive noise / produce cavitation
Check that the piping is not
restricted and the path is
qualified. Check the filter and its
bypass valve
Coupling Loose coupling will cause abnormal noise
Replace the loose coupling.
Replace the pump spindle
Eccentricity of shaft and coupler will lead
to abnormal noise
Oil filling / system relief
valve
Abnormal noise indicates that the valve
may be viscous and there is
contamination
Clean or replace the valve,
check the pump
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