Gorman-Rupp Pumps 04A20-B 818101 and up - Manual (Page 19)

OM-01206 0 SERIES
TROUBLESHOOTING PAGE D - 2
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE (cont.)
PUMP REQUIRES
TOO MUCH
POWER
PUMP CLOGS
FREQUENTLY
EXCESSIVE NOISE
BEARINGS RUN
TOO HOT
Suction intake not submerged at Check installation and correct
proper level or sump too small. submergence as needed.
Impeller or other wearing parts worn Replace worn or damaged parts.
or damaged. Check that impeller is properly
centered and rotates freely.
Impeller clogged. Free impeller of debris.
Pump speed too slow. Check driver output; check
belts or couplings for slippage.
Suction lift or discharge head too high. Check piping installation and
install bypass line if needed. See
INSTALLATION.
Pump speed too high. Check driver output; check that
sheaves or couplings are correctly
sized.
Discharge head too low. Adjust discharge valve.
Liquid solution too thick. Dilute if possible.
Bearing(s) frozen. Disassemble pump and check
bearing(s).
Liquid solution too thick. Dilute if possible.
Discharge flow too slow. Open discharge valve fully to in-
crease flow rate, and run power
source at maximum governed
speed.
Discharge line clogged or restricted; Check discharge lines; straighten
hose kinked. hose.
Cavitation in pump. Reduce suction lift and/or friction
losses in suction line. Record
vacuum and pressure gauge
readings and consult local
representative or factory.
Pumping entrained air. Locate and eliminate source of air
bubble.
Pump or drive not securely mounted. Secure mounting hardware.
Impeller clogged or damaged. Clean out debris; replace damaged
parts.
Bearing temperature is high, but Check bearing temperature regu-
within limits. larly to monitor any increase.
Low or incorrect lubricant Check for proper type and level
of lubricant.
Suction and discharge lines not Check piping installation for proper
properly supported. support.
Drive misaligned. Align drive properly.