Gorman-Rupp Pumps PAH4C60-6068H 1532412 and up - Manual (Page 21)

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE (cont.)
PUMP REQUIRES
TOO MUCH
POWER
PUMP CLOGS
FREQUENTLY
Impeller or other wearing parts worn
or damaged.
Free impeller of debris. Impeller clogged.
Replace worn or damaged parts.
Check that impeller is properly
centered and rotates freely.
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 engine output; consult en­
gine operation manual.
Pump speed too high. Check engine output.
Discharge head too low.
Dilute if possible. Liquid solution too thick.
Adjust discharge valve.
Pump or jack shaft bearing(s) frozen. Disassemble, check and replace
bearing(s) as required..
Liquid solution too thick.
Open discharge valve fully to in­
crease flow rate, and run engine at
maximum governed speed. Discharge flow too slow.
Dilute if possible.
Suction check valve or foot valve
clogged or binding. Clean valve.
Suction intake not submerged at
proper level or sump too small. Check installation and correct
submergence as needed.
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.
Discharge check valve clogged. Check and clean check valve.
Strainer clogged. Check strainer and clean if neces­
sary.
Belt or flexible coupling broken. Check and replace as necessary.
Extreme ambient temperature. Reduce pump output.
Fuel filter clogged. Check & replace often in extreme
operating conditions.
Check and replace as required. Fuel contaminated.
OM-06476 PAH SERIES
TROUBLESHOOTING PAGE D - 2