Gorman-Rupp Pumps 88A2-F6L 1341412 and up - Manual (Page 18)

OM−02720 80 SERIES
TROUBLESHOOTING PAGE D − 2
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP STOPS OR FAILS
TO DELIVER RATED
FLOW OR PRESSURE
(cont.) Strainer clogged.
Impeller or other wearing parts worn
or damaged.
Impeller clogged.
Suction lift or discharge head too
high.
Pump speed too slow.
Check strainer and clean if neces-
sary.
Replace worn or damaged parts.
Check that impeller is properly cen-
tered and rotates freely.
Free impeller of debris.
Check piping installation and install
bypass line if needed. See INSTAL-
LATION.
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 bear-
ing(s).
PUMP CLOGS
FREQUENTLY Discharge flow too slow.
Suction check valve or foot valve
clogged or binding.
Discharge line clogged or restricted;
hose kinked.
Open discharge valve fully to in-
crease flow rate, and run engine at
maximum governed speed.
Clean valve.
Check discharge lines; straighten
hose.
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 regularly
to monitor any increase.
Check for proper type and level of lu-
bricant.
Check piping installation for proper
support.
Align drive properly.