Asia Pacific / English Change

SPJ Irrigation Pump Troubleshooting

Possible Cause

Corrective Action

LITTLE OR NO DISCHARGE

Casing not initially filled with water

Fill pump casing

Total head too high

Shorten suction lift and/or change head

Suction lift too high, or too long

Lower suction lift, install foot valve and prime, or shorten length of suction line

Impeller plugged

Clean

Hole or air leak in suction line

Repair or replace; do not use Teflon tape; use pipe sealing compound

Foot valve too small

Match foot valve to piping or install one size larger foot valve.

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 water to tank or increasing back pressure

Suction piping too small

Increase to pump inlet size or one size larger

Motor wired incorrectly

Check wiring diagram

Casing gasket leaking

Replace

Suction or discharge line valves closed

Open

PUMP WILL NOT DELIVER WATER OR DEVELOP PRESSURE

No priming water in casing

Fill pump casing

Mechanical seal is leaking

Replace (see Rotary Seal Replacement)

Leak in suction line

Repair or replace

Discharge line is closed and priming air has nowhere to go

Open

Suction line (or valve) is closed

Open

Pump is down

Replace worn parts

Foot valve is leaking

Replace foot valve

Suction screen clogged

Clean or replace

LOSS OF SUCTION

Air leak in suction line

Repair or replace

Suction lift too high

Lower suction lift, install foot valve and prime

Insufficient inlet pressure or suction head

Increase inlet pressure by adding more water to tank or increasing back pressure

Clogged foot valve or strainer

Unclog

PUMP VIBRATES AND/OR MAKES EXCESSIVE NOISE

Mounting plate or foundation not rigid enough

Reinforce

Foreign material in pump

Disassemble pump and clean

Impeller damaged

Replace

Worn motor bearings

Replace

Suction lift too high

Lower suction lift, install foot valve and prime

PUMP WILL NOT START OR RUN

Improperly wired

Check wiring diagram on motor

Blown fuse or open circuit breaker

Replace fuse or close circuit breaker

Loose or broken wiring

Tighten connections, replace broken wiring

Stone or foreign object lodged in impeller

Disassemble pump and remove foreign object

Motor shorted out

Replace

Thermal overload has opened circuit

Allow unit to cool, restart after reason for overload has been determined

PUMPS LEAKS AT SHAFT

Worn mechanical seal

Replace (see Rotary Seal Replacement)

×
×