MAINTENANCE
Troubleshooting
For technical assistance, parts, or repair, please contact:
106505101 Rev. 002 08/22
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800.348.2420
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9. Place the square ring and diffuser on the volute.
10. Reposition the case gasket and bolt the volute to the motor adapter.
• Use Blue Loctite 243 on bolts.
• Torque to 20 ft-lbs.
Troubleshooting
Problem
Probable Causes
Corrective Action
Motor Fails to Start or
Not Running
Motor thermal protector tripped
Correct cause for high amperage, such as low voltage or excessive
pumping.
Open circuit breaker or blown fuse
Check electric wiring and motor for short circuits and correct.
Impeller binding
Remove pump case and check for debris.
Motor improperly wired
Check complete suction line and all fittings for air leaks and verify
foot valve has adequate submergence.
Defective motor
Take to an authorized motor shop for repair or replacement.
Little or no discharge
Pump is not primed: air or gases in
pumpage
Check suction line and foot valve for leaks. Make sure that water
level has not dropped to uncover suction inlet. Prime pump.
Discharge or suction plugged or valve
closed
Clear obstructions from suction and discharge lines.
Incorrect rotation (3-Phase only)
Interchange any two of three wires either at the motor or starter.
Low voltage or phase loss
Correct incoming power to match motor nameplate requirements.
Impeller worn or plugged
Clean or replace impeller.
System head too high
Reduce system head (back-pressure on pump) or resize pump.
Excessive suction lift or losses, or NPSHA
too low for the pump
Locate pump closer to the water source, increase pipe size or resize
pump.
Low pump capacity or
pressure
Valves in suction or discharge lines par
-
tially closed
Open valves to reduce possible restrictions.
Suction or discharge line partially
plugged
Clear obstructions from discharge line.
Wrong pump rotation
Correct to proper rotation.
Excessive power
consumption
Impeller binding
Remove pump case and check for debris.
Discharge head too low creating exces
-
sive flow rate
Close down discharge valve to increase pressure and throttle back
flow rate.
Fluid viscosity: specific gravity too high Modify fluid properties or resize pump.
Excessive noise and
vibration
Impeller binding
Remove pump case and check for debris.
Pump is not primed: air or gases in
pumpage
Check complete suction line and all fittings for air leaks and verify
foot valve has adequate submergence.
Discharge or suction plugged or valve
closed
Clear obstructions from suction and discharge lines.
Impeller worn or plugged
Clean or replace impeller.
Excessive suction lift or losses. NPSHA
too low for the pump
Locate pump closer to the water source, increase pipe size or resize
pump.
Discharge head too low, creating exces
-
sive flow rate
Close down discharge valve to increase pressure and throttle back
flow rate.
Worn bearing
Check bearing for damage and replace if necessary.
Pump, motor, or piping loose
Verify all connections and mountings are secure and piping sup
-
ported.
Water leakage at pump
shaft
Defective seal assembly
Replace seal.
