TM 5-6640-212-14
Table 5-1. Water Pump Troubleshooting- - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. MOTOR RUNS-NO WATER-LOW CAPACITY-LOW PRESSURE.
Step 1.
Check if pump is primed.
Prime pump.
Step 2.
Check for low motor speed.
Check for low voltage or defective motor.
Step 3.
Check for air leak in shaft seal.
If shaft seal leaks, replace seal.
Step 4.
Check for air leaks in piping.
Repair or replace any defective piping.
Step 5.
Check for plugged impeller in pump.
Disassemble and clean or replace impeller.
4. PUMP VIBRATES OR IS NOISY.
Step 1.
Check for air leak in suction pipe.
Check for location of leak, repair or replace pipe.
Step 2.
Check for clogged impeller.
Disassemble pump, repair or replace impeller.
Step 3.
Check motor for bent shaft.
If motor shaft is bent, replace motor.
5-3
