Troubleshooting
Waukesha Cherry-Burrell
®
Brand Universal 3 Pump
Page 94
95-03103
02/2021
Noisy operation
Cavitation
High fluid viscosity.
High vapor pressure fluid.
High temperature.
Slow down pump, reduce temperature,
change system setup.
Net Inlet Pressure Available
less than Net Inlet Pressure
Required.
Increase NIPA - Net Inlet Pressure
Available or reduce NIPR - Net Inlet
Pressure Required. Contact SPX
FLOW if necessary.
Air or gas in fluid
Leaks in the pump or
piping.
Correct leaks.
Dissolved gas or naturally
aerated products.
Minimize discharge pressure (also see
"Cavitation," above).
Noisy operation caused by
mechanical problems
Rotor to body contact
Improper assembly of pump.
Check clearances and adjust
shimming.
Distortion of pump due to
improper piping installation.
Change piping installation to eliminate
piping stress and distortion on body.
Pressures required higher
than the pump is rated for.
Reduce discharge pressure required.
Worn bearings.
Rebuild with new bearings and
lubricate regularly.
Rotor to Rotor Contact
Loose or incorrectly-timed
gears.
This has caused severe damage to
components - rebuild with new parts.
Worn gear splines.
This has caused severe damage to
components - rebuild with new parts.
Drive noise caused by gear
trains, chains, couplings,
bearings.
Repair or replace drive parts. Check
bearings for damage and replace as
necessary.
Pump requires excessive
power (overheats, stalls,
high current draw,
breakers trip)
Higher than expected viscosity
losses.
If within pump rating, increase drive
size.
Higher than expected pressures.
Reduce pump speed.
Increase line sizes.
Fluid is colder with a higher
viscosity than expected.
Heat fluid, insulate lines or heat trace
lines.
Increase line sizes.
PROBLEM POSSIBLE
CAUSE SUGGESTED
ACTION