TM 5-6640-212-14
Table 3-5. Water Pump Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
PUMP FAILS TO START, OR IT STOPS DURING OPERATION.
Step 1.
Check for defective wiring.
Check wiring and correct.
Step 2.
Current overload causes circuit breaker or overload
cutout switch in starter relay box to open.
Close circuit breaker and reset overload switch in
relay box.
Step 3.
Check for defective motor.
If defective, replace motor.
Step 4.
Check for broken or clogged impeller.
Clean volute and inspect impeller.
Replace, if defective.
2.
PUMP FAILS TO DELIVER WATER AT PROPER PRESSURE.
Step 1.
Check for insufficient water.
Fill water tank.
Step 2.
Check if motor speed too low.
Check electrical system and correct defect.
Step 3.
Check for leak at shaft seal.
Disassemble pump and replace seal.
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