Gorman-Rupp Pumps 16C20-F4L 1317844 and up User Manual
Page 21
OM-01604
10 SERIES
TROUBLESHOOTING
PAGE D - 2
TROUBLE
POSSIBLE CAUSE
PROBABLE REMEDY
PUMP STOPS OR FAILS
TO DELIVER RATED
FLOW OR PRESSURE
(cont.)
Suction intake not submerged at
proper level or sump too small.
Impeller or other wearing parts worn
or damaged.
Impeller clogged.
Discharge head too high.
Suction lift too high.
Pump speed too slow.
Check installation and correct sub
mergence as needed.
Replace worn or damaged parts.
Check that impeller is properly cen
tered and rotates freely.
Free impeller of debris.
Install bypass line.
Measure lift w/vacuum gauge. Re
duce lift and/or friction losses in suc
tion line.
Check engine output; consult engine
operation manual.
PUMP REQUIRES TOO
MUCH POWER
Pump speed too high.
Discharge head too low.
Liquid solution too thick.
Bearing(s) frozen.
Check engine output.
Adjust discharge valve.
Dilute if possible.
Disassemble pump and check
bearing(s).
PUMP CLOGS
FREQUENTLY
Discharge flow too slow.
Liquid solution too thick.
Discharge line clogged or re
stricted; hose kinked.
Suction check valve or foot valve
clogged or binding.
Open discharge valve fully to in
crease flow rate, and run engine at
maximum governed speed.
Dilute if possible.
Check discharge lines; straighten
hose.
Clean valve.
EXCESSIVE NOISE
Cavitation in pump.
Pumping entrained air.
Pump or drive not securely
mounted.
Impeller clogged or damaged.
Reduce suction lift and/or friction
losses in suction line. Record vacu
um and pressure gauge readings
and consult local representative or
factory.
Locate and eliminate source of air
bubble.
Secure mounting hardware.
Clean out debris; replace damaged
parts.
BEARINGS RUN TOO
HOT
Bearing temperature is high, but
within limits.
Low or incorrect lubricant.
Suction and discharge lines not
properly supported.
Drive misaligned.
Check bearing temperature regular
ly to monitor any increase.
Check for proper type and level of
lubricant.
Check piping installation for proper
support.
Align drive properly.