Gorman-Rupp Pumps SFV4A-X 1531245 and up - Manual (Page 21)

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
MOTOR RUNS BUT
FAILS TO DELIVER
RATED FLOW OR
PRESSURE
PUMP STARTS
THEN SHUTS OFF
EXCESSIVE
NOISE OR VIBRA­
TION
SFV SERIES X‐PROOF PUMPS OM-06628
TROUBLESHOOTING PAGE D - 2
Pump running backwards. Check and correct impeller rotation
(see Rotation in Installation and
Operation Manual).
Voltage too low or too high; excessive Check incoming voltage; check
voltage drop between pump and control. cable length.
Discharge head too high. Reduce discharge head, or install
staging adaptor and additional pump.
Discharge throttling valve partially Open discharge valve; check piping
closed; check valve improperly installed. installation.
Impeller or discharge line clogged. Check and clear as necessary.
Liquid being pumped too thick. Dilute liquid if possible.
Impeller worn or damaged. Replace.
Insufficient liquid in wet well. Stop pump until liquid level rises;
install liquid level devices.
Clogged suction port or impeller Clear blockage; reset overload
causing motor to overload. device in control box.
Motor overheated; thermal switch Allow pump to cool.
tripped.
Moisture sensing device tripped. Return pump to factory or authorized
repair facility.
Motor bearings defective. Return pump to factory or authorized
repair facility.
Motor cable damaged. Check (see Electrical Testing).
Insufficient liquid in wet well. Stop pump until liquid level rises;
install liquid level devices.
Pump operating outside designed Check discharge head and flow;
operating range. adjust as required to meet perform‐
ance specifications.
Impeller clogged. Clear blockage.
Impeller loose or damaged. Check impeller; replace if necessary.
Motor shaft or bearings defective. Replace.
Pumping entrained air. Check wet well liquid level; install
baffles if required.