TM 5-4320-274-14&P
Table 4-2. Troubleshooting
Malfunction
Test or Inspection
Corrective Action
ELECTRIC MOTOR
1. ELECTRIC MOTOR FAILS TO FUNCTION PROPERLY.
Step 1. Check for loose or corroded wiring connections.
Tighten loose connections at electric motor and ground. Clean corroded connections.
Step 2. Check for correct connection of phase wires
Reverse phase wires in accordance with paragraph 4-3.
Step 3. Check for defective motor.
If phase wires, ground and power source are wired correctly but the motor does not function
properly, replace the motor.
2. ELECTRIC MOTOR OVERHEATS.
Step 1. Check power source voltage.
If the power source is too low, too high, or unbalanced, connect the electric motor to a proper
power source.
Step 2. Check motor for binding.
If the motor has any restrictive rotation, replace the motor.
PUMP
3. PUMP FAILS TO FUNCTION PROPERLY
Check to see if air is entering pump body through loose connections.
Tighten loose connections and be certain hoses have no leaks.
4. PUMP LEAKS DURING OPERATION.
Inspect for any visible leakage near seals or suction valve.
Any evidence of leakage, notify general support.
5. NO WATER OR INSUFFICIENT WATER OUTLET PRESSURE.
Step 1. Ascertain if pump is primed.
Prime pump.
Step 2. Inspect suction line for clogging.
Remove the suction line, clean clogged area and replace on unit.
Step 3. Excessive suction lift.
Locate pump closer to liquid.
Step 4. Air leaks on suction side of pump.
Correct air leaks.
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