TM 5-6640-212-14
Table 5-1. Water Pump Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. MOTOR WILL NOT START OR RUN.
Step 1.
Check circuit breaker.
Reset if open.
Step 2.
Using test lamp, check for power at motor terminals.
If power is available at terminals proceed to Step 3,
if not, trace wiring for short, or open condition.
Step 3.
Check for defective motor capacitor.
If defective replace motor.
Step 4.
Check for stuck impeller or seal.
Turn motor shaft with screwdriver engaging slot
end of shaft. If motor is stuck, disassemble and correct
cause.
2. MOTOR OVERHEATS.
Step 1.
Check for low voltage.
Bring voltage level up to requirement.
Step 2.
Mechanical defect in motor or pump.
Turn motor shaft with screwdriver engaging slot end of
shaft. If motor is stuck or binding is indicated,
disassemble and correct cause.
Step 3.
Check for poor ventilation.
Vacuum clean motor air passages, ventilate surrounding
area.
5-2
