Operating Manual Troubleshooting
4/1/99
35
S
OLUTIONS
Figure 27. Power Contactor
1.
POWER CONTACTOR- A power contactor set to trip when the motor draws too
much current protects the electric motor. To restore the motor to operation, allow it
to cool and with power OFF, depress the reset button. It is also important to
determine the cause of the trip. Improper low line voltage can also cause harm to the
motor due to overheating which will cause the power contactor to trip
2.
ZERO OR LOW PRESSURE- Remember when the motor or pump switch in the off
position hydraulic pressure cannot be generated.
Assuming the pump is in proper working order, and the pump switch is set to
NORMAL, the major factors, which can cause it not to produce pressure, are that the
pump is either not primed or loses its prime. To assure a positive prime, check the
following:
a)
Hydraulic reservoir serviced to the proper level including a check that the
cartridge strainer and hydraulic fluid are clean.
b)
Pump case is full with Hydraulic fluid.
c)
Inlet fitting is fully tight to insure no air is leaking into the pump case.
3.
SCREECHING-the screeching noise is a characteristic of Cavitation and is normal at
initial start-up for a maximum of 30 seconds. If the screeching continues for more
than 30 seconds, check that the inlet fittings are tight and that the pump has not lost
its prime.
A second cause of screeching can be excessive hydraulic oil temperature. Determine that
the reservoir is properly serviced and if necessary provide better ventilation to permit the
reservoir to dissipate heat more efficiently.
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