IWAKI PUMPS Hicera V Series, Instruction Manual, Page: 26 / 32

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Maintenance
2. Troubleshooting
Problem Cause Countermeasures
The pump does not start
to run.
Power is not supplied. Supply power.
Wrong wiring or disconnection Correct wiring.
Motor failure (winding disconnection or
capacitor failure)
Replace motor.
*Plunger seizing due to crystallization Take apart the pump head and clean
wet ends.
High specific gravity or high viscosity Use an applicable pump model.
The pump does not de-
liver liquid during opera-
tion.
Dry running Replace both the plunger and cylinder.
A suction and a discharge line is
closed during operation.
Open both the suction and discharge
lines.
A supply tank is empty. Replenish the supply tank.
The motor is rotating the other way
around.
Correct wiring.
A flow rate is too small.
Air ingress through a tube joint. Keep tube joints air-tight.
Pump rotation speed is too low. Increase a rotation speed.
A lip seal is crushed. Replace as necessary.
A suction line is crushed. Replace as necessary.
Significant vibration
or noise
Motor failure (winding disconnection or
capacitor failure)
Replace motor.
Dry running Replace both the plunger and cylinder.
Discharge pressure is too high. Reduce discharge pressure.
A suction and a discharge line is
closed during operation.
Open both the suction and discharge
lines.
Air ingress through a tube joint. Keep tube joints air-tight.
Development of cavitation Reduce a motor rpm, liquid tempera-
ture, and tubing resistance.
*A supply tank is empty. Replenish the supply tank.
*Anchor bolts are loose. Fasten anchor bolts.
Sympathetic vibration with the pump
and other parts of system
Place an anti-vibration rubber beneath
the pump.
Liquid leaks. A lip seal is crushed. Replace as necessary.
Pump stops.
Wrong wiring or disconnection Correct wiring.
Motor failure (winding disconnection or
capacitor failure)
Replace motor.
Clogging due to foreign matters Remove foreign matters. Replace parts
if damaged.
* means major failure cases.