Gorman-Rupp Pumps 12D1-1B20 1463862 and up - Manual (Page 17)

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE
PUMP REQUIRES
TOO MUCH
POWER
PUMP CLOGS
FREQUENTLY
Free impeller of debris. Impeller clogged.
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.
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.
Suction check valve or foot valve
clogged or binding. Clean valve.
Leaking or worn seal or pump gasket. Check pump vacuum. Replace
leaking or worn seal or gasket.
Pump speed too slow. Check engine output; consult en-
gine operation manual.
Pump speed too high. Check engine output.
Suction lift or discharge head too high. Check piping installation and install
bypass line if needed. See INSTAL-
LATION.
Discharge line clogged or restricted;
hose kinked. Check discharge lines; straighten
hose.
Impeller clogged or dam-
aged. Clean out debris; replace damaged
parts.
Air leak in suction line. Correct leak.
Lining of suction hose collapsed. Replace suction hose.
Suction intake not submerged at
proper level or sump too small. Check installation and correct
submergence as needed.
Impeller or other wearing parts worn
or damaged. Replace worn or damaged parts.
Check that impeller is properly
centered and rotates freely.
OM−06361 10 SERIES
TROUBLESHOOTING PAGE D − 2