Troubleshooting Waukesha Cherry-Burrell
®
Brand Universal 3 Pump
Page 94 95-03103 11/2018
Troubleshooting
PROBLEM POSSIBLE CAUSE SUGGESTED ACTION
No flow, pump rotors are
not turning
Drive motor not running. Check resets, fuses, circuit breakers.
Keys sheared or missing. Replace.
Drive belts, power transmission
components slipping or broken.
Replace or adjust.
Pump shaft or gears sheared. Inspect: and replace parts as
necessary.
No flow, pump rotors are
turning
Rotors turn in the wrong
direction.
Check motor hookup to reverse motor
rotation.
Relief valve not properly
adjusted, or held open by foreign
material.
Adjust or clear valve.
Suction port is blocked, not
allowing flow to the pump.
Check all inlet valves, strainers, tank
outlet ports.
No flow, pump not priming Valve closed in inlet line. Open valve.
Inlet line clogged or restricted. Clear line, clean filters, etc.
Air leaks due to bad gaskets or
pipe connections.
Replace gaskets; check lines for
leakage (can be done by air pressure or
by filling with liquid and pressurizing
with air).
Pump speed too slow. Increase pump speed.
Pump speed too fast for high-
viscosity liquid.
Decrease pump speed.
Liquid drains or siphons from
system during off periods.
Use foot valve or check valves.
Filling inlet lines with material before
startup may solve startup priming
problems due to no material in system.
"Air" lock caused by fluids which
"gas off", or vaporize, or allow
gas to come out of solution
during off periods.
Install and use a manual or automatic
air bleed from pump or lines near
pump.
Extra clearance on rotors, worn
pump.
Increase pump speed, use foot valve to
improve priming.
Replace worn rotors.
Net inlet pressure available too
low.
Check Net Inlet Pressure Available &
Net Inlet Pressure Required. Change
inlet system as needed.
On "Vacuum'' inlet system:
On initial start-up, atmospheric
"blow back'' prevents pump from
developing enough differential
pressure to start flow.
Install check valve in discharge line.
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