GMS SERIES
OM-04386
PAGE D-2
TROUBLESHOOTING
TROUBLESHOOTING CHART
Shaft seal leaking; gaskets, O‐rings
worn.
TROUBLE
POSSIBLE CAUSE
PROBABLE REMEDY
PUMP DOES
NOT DELIVER
RATED DIS
CHARGE OR
CAPACITY
PUMP FAILS
TO PRIME OR
LOSES PRIME
Air leak in suction line; end of suction
line not submerged; foot valve blocked
or jammed; insufficient liquid in sump or
tank.
Check and correct as required.
Shaft seal leaking; gaskets, O‐rings
worn.
Check vacuum gauge; disassemble
pump and replace faulty parts.
Leaking relief valve.
Disassemble and repair.
Suction lift too high.
See
INSTALLATION, SECTION B
and
check piping.
Suction strainer clogged.
Check strainer.
Pump rotation incorrect.
See
OPERATION, SECTION C
and
check rotation.
Pump speed too slow.
Check driver speed.
Check and correct as required.
Readjust.
Suction or discharge lines blocked;
suction or discharge valves closed.
Check strainer, valves and piping.
Air leak in suction line; end of suction
line not submerged; foot valve blocked
or jammed; insufficient liquid in sump or
tank.
Check vacuum gauge; disassemble
pump and replace faulty parts.
Relief valve pressure set too low.
Housing dry.
Add liquid to housing, see
OPERATION,
SECTION C
.
Rotating parts worn or damaged; im
proper end clearance.
Replace defective parts; see
SETTING
END CLEARANCE
in
Maintenance And
Repair, Section E
.
Pump speed too slow.
Check driver speed; check belts/coup
lings.
PUMP REQUIRES
TOO MUCH
POWER
Pump speed too high.
Reduce driver output.
Internal parts worn.
Disassemble pump and inspect.
Discharge line undersized and/or too
long.
Increase size, decrease length.
Pump “starving” or liquid vapor
izing in suction line.
Increase suction pipe size or reduce
length; position pump below liquid level.
Pump “starving” or liquid vaporizing
in suction line.
Increase suction pipe size or reduce
length; position pump below liquid level.
Insufficient end clearances.
Readjust clearance; see
SETTING END
CLEARANCE
in
Maintenance and Re
pair, Section E
.
