Gorman-Rupp Pumps SE2C3 115V 1P 1483930 and up - Manual (Page 20)

SE SERIES OM−06492
TROUBLESHOOTING PAGE D − 2
Table 1. Trouble Shooting Chart (cont.)
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
MOTOR RUNS, BUT
PUMP FAILS TO
DELIVER RATED
DISCHARGE Discharge head too high.
Low or incorrect voltage.
Discharge throttling valve partially
closed; check valve installed im-
properly.
Discharge line clogged or re-
stricted; hose kinked.
Liquid being pumped too thick.
Strainer screen or impeller clogged.
Insufficient liquid in sump or tank.
Worn impeller vanes; excessive im-
peller clearance.
Reduce head.
Measure control box voltage, both
when pump is running and when
shut-off.
Open discharge valve fully; check
piping installation.
Check discharge lines; straighten
hose.
Dilute liquid if possible.
Clear clog(s). Stop pump; back flow
may flush away debris.
Stop pump until liquid level rises.
Check impeller and clearance. See
PUMP END REASSEMBLY.
PUMP RUNS WITH
EXCESSIVE NOISE OR
VIBRATION Pumping entrained air.
Damaged or unbalanced impeller.
Discharge piping not properly sup-
ported.
Impeller jammed or loose.
Motor shaft or bearings defective.
Pump cavitation.
Check liquid level in sump; check
position of pump and liquid level
sensing device(s).
Replace impeller.
Check piping installation.
Check impeller.
Disassemble pump and check mo-
tor and bearings.
Reduce discharge head, or restrict
flow on low head applications.
ELECTRICAL TESTING
If you suspect that pump malfunctions are caused
by defects in the motor, power cable or control box,
perform the following checks to help isolate the de-
fective part.
Obtain the services of a qualified elec-
trician to troubleshoot, test and/or ser-
vice the electrical components of this
pump.
Be certain to refer to the wiring diagram(s)
in the Installation Operations manual be-
fore reconnecting any electrical compo-
nents which have been disconnected.
Test Equipment
A volt/amp/ohmmeter and megohmeter of ade-
quate range and quality will be required to conduct
the following electrical tests. The suggested equip-