Gorman-Rupp Pumps 612L20-B 814882 and up - Manual (Page 18)

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE (cont.)
PUMP REQUIRES
TOO MUCH
POWER
PUMP CLOGS
FREQUENTLY
Free impeller of debris. Impeller clogged.
Discharge head too high.
Measure lift w/vacuum gauge. Re-
duce lift and/or friction losses in
suction line. Suction lift too high.
Install bypass line.
Pump speed too slow. Check driver output; check belts or
couplings for slippage.
Discharge head too low.
Dilute if possible. Liquid solution too thick.
Adjust discharge valve.
Open discharge valve fully to in-
crease flow rate, and run engine at
maximum governed speed. Discharge flow too slow.
EXCESSIVE NOISE Cavitation in pump. Reduce suction lift and/or friction
losses in suction line. Record vac-
uum and pressure gauge readings
and consult local representative or
factory.
Clean out debris; replace damaged
parts. Impeller clogged or damaged.
Secure mounting hardware. Pump or drive not securely mounted.
Locate and eliminate source of air
bubble. Pumping entrained air.
Strainer clogged. Check strainer and clean if neces-
sary.
Pump speed too high. Check driver output; check that
sheaves or couplings are correctly
sized.
BEARINGS
RUN TOO HOT Bearing temperature is high, but
within limits.
Align drive properly. Drive misaligned.
Check piping installation for proper
support. Suction and discharge lines not prop-
erly supported.
Check for proper type and level of
lubricant. Low or incorrect lubricant.
Check bearing temperature regu-
larly to monitor any increase.
Leaking or worn seal or pump gasket. Check pump vacuum. Replace
leaking or worn seal or gasket.
Suction check valve or foot valve
clogged or binding. Clean valve.
Impeller or other wearing parts worn
or damaged. Replace worn or damaged parts.
Check that impeller is properly
centered and rotates freely.
OM−01395 60 SERIES
TROUBLESHOOTING PAGE D − 2