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PB Booster Pump Troubleshooting

Possible Cause

Corrective Action

PUMP WON’T START OR RUN AT FULL SPEED

Blown fuse or open circuit breaker

Replace fuse or close circuit breaker. See wire size chart for proper break/fuse size

Power supply in OFF position

Turn power on

Incorrect voltage at motor (check voltage with motor running)

a. Voltage must be within ± 10% of motor rated voltage. Check incoming voltage. Contact power company

b. Make certain that voltage of motor matches voltage of power supply. See motor name plate and motor wiring diagram.

c. Check wire size from main switch to pump.  See wire size chart for correct wire size

Loose, broken or incorrect wiring

Rewire any incorrect circuits. Tighten connections, replace defective wires

Defective motor

Replace motor

Pump hydraulic components clogged/worn/damaged

Replace worn parts or entire pump. Clean parts if required

PUMP OPERATES, BUT DELIVERS LITTLE OR NO WATER

Manual or solenoid valves plumbed into system restricting flow

a. Check all valves on pump inlet and discharge sides of system to be sure they are opened properly to allow flow to and from the pump

b. Bleed trapped air in pump which keeps water from reaching the pump. (Normally due to closed valve in discharge plumbing)

In-line filter restricting flow

Check all in-line filters to be sure they are not plugged or restricted

Low line voltage

See low line voltage corrective action (above)

Inadequate water supply to booster pump

Check pressure on inlet side of booster to be sure positive pressure is maintained to the booster pump

Undersized piping

Replace undersized piping

Leak on inlet side of system

Make sure connections are tight. Repair leaks as necessary

Inadequate, defective or plugged foot valve and/or strainer

Clean, repair or replace as needed

Worn or defective pump parts or pump.

Replace worn parts or entire plugged impeller. Clean parts if necessary.

Suction lift too great

Pump should be operated under

flooded suction only

Pump not primed

Prime pump - Make certain inlet pipe is drawn up tight and pump and pipe are full of water

Incorrect rotation, motor running backwards

Reverse motor rotation can occur on three phase units. To correct, interchange any two incoming power leads.

EXCESSIVE NOISE WHILE PUMP IS ON

Pump not secured to firm foundation

Secure properly

Piping not supported

Make necessary adjustments

Restricted inlet line

Clean or correct

Cavitation (noise like marbles in pump)

a. Reduce speed on direct drive

b. Increase inlet pipe size

c. Too viscous (material being pumped too thick

Worn motor bearings

Replace bearings or motor

PUMP LEAKS

Worn mechanical seal (leaks at shaft)

Replace shaft (rotary) seal

Worn o-ring seals

Replace o-ring seals, located inside both ends of the stainless steel shell

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