Gorman-Rupp Pumps SE1 1/2B3-E.33 12V 1483930 and up - Manual (Page 14)

PUMP RUNS WITH
EXCESSIVE NOISE
OR VIBRATION
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
OM−06490 SE SERIES
TROUBLESHOOTING PAGE D − 2
Pumping entrained air. Check liquid level in sump; check
position of pump.
Damaged impeller. Inspect and replace impeller.
Motor shaft or bearings defective. Disassemble pump and check motor
and bearings.
ELECTRICAL TESTING
If you suspect that pump malfunctions are caused
by defects in the power cables or electrical compo-
nents, perform the following checks to help isolate
the defective part.
Obtain the services of a qualified elec-
trician to troubleshoot, test and/or ser-
vice the electrical components of this
pump.
Always disconnect the battery clamps
from the vehicle battery when testing elec-
trical components.
Test Equipment
A volt/amp/ohmmeter of adequate range and qual-
ity will be required to conduct the following electri-
cal tests.
Equipment Use
Ammeter To check AC Voltage
and current (amperage)
Ohmeter To measure resistance
(ohms) to ground
Power Cable Continuity Check
Disconnect the power cables inside the motor cov-
er. Use the ohmmeter to check continuity of the
cables, and replace defective cables as required.
Never attempt to alter the length or re-
pair any power cable with a splice. The
pump motor and cable must be com-
pletely waterproof. Damage to the pump
or personal injury may result from alter-
ations.
Circuit Breaker Check
The circuit breaker used in this pump is normally
closed. Disconnect the wires from the breaker, and
check continuity across the terminals. If the circuit
is open, replace the breaker.
On-Off Switch Check
Disconnect red battery cable lead from circuit
breaker terminal. Check continuity between bat-
tery clamp and ring terminal on the end of the
cable. Moving ON-OFF switch from ON to OFF
should break continuity. If the switch is bad, the
continuity will remain open when the switch is in
the ON position.