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Align the pulley (coupling).
Open the valve.
Maintain the specific gravity as per specifications. Review the
specifications.
Tighten the bolts and nuts.
Review the specifications with consideration given to the total
head.
Maintain the viscosity as per specifications. Review the
specifications.
Adjust the drive belt tension.
Reinforce the pipe supports.
Firmly secure the pump with anchor bolts.
Overhaul the suction pipe and eliminate the cause.
Contact your dealer for repair.
Electric motor failure
Closed valve
Improper priming or air bleeding
Loose bolts and nuts
Bleed air from the pump and suction pipe and fill them with water.
Air trapped along the suction pipe
Insufficient NPSH
Main causes
- 7 -
Check the rotation direction and overhaul the pump.
Abnormal noise is
generated.
Abnormal vibration is
generated.
The motor is overloaded.
Change the suction position to prevent air from being sucked.
Improve the suction pipe.
Check the water level, liquid temperature, and suction piping
resistance in the suction tank and maintain sufficient NPSH.
Problem
Carry out correct wirng.
Overhaul the discharge pipe and eliminate the cause.
Blocked pump (including freezing)
Remedies
Faulty wiring in the electric motor
Causes
Impeller removed by reverse rotation
Blocked discharge pipe (including
freezing)
Blocked suction pipe (including freezing)
Overhaul the pump and eliminate the cause.
The pump does not work.
Water is not pumped up.
The discharge rate is low.
The discharge pressureis
low.
Insufficient pipe supports
Sucking air
Control the amount of flow with valves as per specifications.
Control the amount of flow with valves as per specifications.
Improperly secured pump
Improper pulley (coupling) alignment
Undertensioned or overtensioned drive
belt
Liquid specific gravity too high
Overdischarge
Liquid viscosity too high
Total pump head too small or too large
Underdischarge
Pump troubleshooting (at startup)