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Problem
Pump not turning
Pump not priming
Insufficient flow
Noisy operation
Pump overloads
Play between gears
If assistance is required, please contact your local sales office with the following information:
1. Operating conditions.
2. Accurate description of default.
3. Model of pump and serial number.
4. If possible installations sketch of pump system.
TROUBLESHOOTING
Cause
Interruption of electrical power
Key sheared or missing.
Coupler or belts are not connected.
Pump shaft or gears sheared.
Wrong rotation.
Relief valve not properly adjusted.
Valve closed in suction lines.
Suction line clogged or restricted.
Air leak in connections or seal.
Pump speed too slow.
Suction line does not remain flooded.
Air lock.
Excessive clearances in pump.
Net inlet pressure low.
Speed too low.
Air leak.
Cavitation
Viscous product.
High vapor pressure, high temp.
Leaks in piping or pump.
Dissolved gas in product.
Mechanical noise.
Excessive weight from piping,
Pump body distorted.
Excessive discharge pressure.
Worn bearing.
Worn gears.
Rotor-to-rotor contact.
Viscosity and pressure of
product higher than expected.
Rotor contact to housing or cover
Worn gear teeth.
Gear loose on shaft.
Solution
Reset circuit breaker, check
fuses.
Replace.
Replace or adjust.
Replace.
Reverse.
Adjust valve.
Open valve.
Clear suction line.
Repair leak.
Increase sped.
Install foot valve.
Bleed suction line.
Replace out of tolerance parts
Increase suction pressure
Adjust speed as required.
Repair leak.
Increase net inlet pressure.
Slow pump, reduce product.
Reduce temperature.
Repair leaks.
Reduce discharge pressure.
Check tolerances.
Support piping.
Check align and level
Reduce discharge pressure.
Replace bearing.
Replace gears
Time rotors, replace twisted
shafts, replace worn gears.
Reduce pump speed, increase
piping size,
Adjust clearance
Replace gear.
Inspect gear key, keyway and
shaft. If all are undamaged,
retighten the gear retaining nut.
Check for backlash.
9
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