Gorman-Rupp Pumps 86A2-F4L 1322538 and up - Manual (Page 19)

OM-00957 80 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.