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5. Too high temperature
in pump or motor.
a) Air in suction pipe or pump. Vent the suction pipe or the pump, and replenish.
b) Inlet pressure too low. Increase the liquid level on the suction side.
Open the isolating valve in the suction pipe.
See the installation and operating instructions.
c) Bearings lubricated with too little, too much
or unsuitable lubricant.
Replenish, reduce or replace lubricant.
d) Axial pressure too high. Check the relief holes of the impeller and the lock
rings on the suction side.
e) Motor-protective circuit breaker is
defective, or setting is incorrect.
Check the setting of the motor-protective circuit
breaker, and replace, if necessary.
f) The motor is overloaded. Reduce the flow rate.
Fault Cause Remedy
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