First, the vibration pump noise causes and elimination methods
Reason：
1, oil pump motor installation is not concentric.
2, loose coupling.
3, oil pump internal fault.
4, the oil level is too low, the inhaled air fluid from the connecting parts of the oil strainer or joint.
5, from the motor moving shaft suction air.
6, oil filter oil filter net.
7, return tubing loose suction air or tubing on the oil surface, mixed with air into the oil.
Trouble shooting method:
1, concentricity should be transferred to less than 0.1mm.
2, the coupling correction.
3, repair or replace the oil pump.
4, increase oil in the oil filter and joint position 400mm above.
5, replace the rotating shaft seal ring.
6, clean the oil strainer, filter oil.
7, clean the oil strainer, filter oil.
8, the locking oil return pipe, the return pipe extended into the oil beneath the surface.
Two, motor noise causes and elimination methods
Reason：
1, motor bearing damage.
2, motor coil winding fault.
3, motor wiring error, system pressure rise, noise increases.
Trouble shooting method:
1, replace the bearing.
2, replace or repair motor.
3, re reference wiring diagram wiring.
Three, the total pressure valve noise (overflow valve) causes and elimination methods
Reason：
1, the pilot valve pilot valve cavity before the air.
2, relief valve main valve core damping hole by oil dirt plug.
3, pilot valve and seat with strain not close.
4, spring deformation or wrong.
5, remote control mouth oil flow is too large.
6, hydraulic oil viscosity is too low or too high.
7, and loop components resonate.
Trouble shooting method:
1, strengthen sealing, anti lift pressure several times exhaust.
2, cleaning the valve body, so that damping hole smooth.
3, repair or replacement.
4, overhaul and replacement of spring.
5, reduce the flow of remote control port.
6, the replacement of oil.
7, other components pressure settings can not be similar to the relief valve pressure setting value.