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CJ101, CJ103 Centrifugal Pump Troubleshooting

Possible Cause

Corrective Action

LITTLE OR NO DISCHARGE

Pump not primed

Prime unit

Total head too high

Shorten suction lift and/or discharge head

Suction head higher than pump designed for

Lower pump inlet

Impeller clogged

Clean

Incorrect rotation

Refer to wiring information

Leak in suction line

Repair or replace

Inadequate foot valve

Make needed adjustments

Impeller damaged

Replace

Foot valve or suction line not submerged deep enough in water

Submerge lower in water

Insufficient inlet pressure or suction head

Increase inlet pressure by adding more fluid to fluid source

Wrong size piping

Make needed adjustments

Casing gasket leaking

Replace gasket

Suction or discharge line valves closed

Open

LOSS OF SUCTION

Air leak in suction line

Repair

Suction head too high

Lower pump inlet

Insufficient inlet pressure or suction head

Increase inlet pressure by adding more fluid to fluid source

Clogged foot valve or strainer

Clean or replace

PUMP VIBRATES AND/OR MAKES EXCESSIVE NOISE

Mounting plate or foundation not rigid enough

Reinforce

Foreign material in pump

Clean

Damaged impeller

Replace

Cavitation present

Check suction line for proper size and be certain valve is open. Remove excessive loops in suction line

Worn motor bearings

Replace

Bent impeller shaft

Replace

PUMP WILL NOT START OR RUN

Improperly wired

Refer to wiring diagram

Blown fuse or open circuit breaker

Replace fuse or close circuit breaker

Loose or broken wiring

Tighten connections and replace broken wiring

Impeller clogged

Clean

Motor shorted out

Replace

PUMPS LEAKS AT SHAFT

Worn mechanical seal

Replace

Bent impeller shaft

Replace

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