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Table 3-3. Water System Troubleshooting
Up
TM-5-6640-213-14 Laboratory Air Mobile Aviation Fuel NSN
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PUMP FAILS TO DELIVER AIR AT PROPER PRESSURE. - TM-5-6640-213-140083
TM 5-6640-213-14
T a b l e 3-3. Water System Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Check for bent shaft, warped impeller, worn bearings.
R e m o v e and inspect volute. Replace defective parts.
4. MOTOR OVERHEATS.
Step 1.
C h e c k for mechanical defects inpumpor motor.
C h e c k motor for easy rotation and straight shaft, and correct
condition as required.
Packing nut too tight, or incorrect voltage.
Step 2.
Adjust packing nut.
C h e c k electrical system and correct
applicable defect.
5, MOTOR FAILS TO START OR HUMS.
Step 1.
I n c o r r e c t electrical current.
Pull plug, check for correct current as shown on motor nameplate.
Step 2.
Defective plug, cord or switch.
Examine plug, cord and switch, replace if defective.
Step 3.
Check if unit is extremely cold.
B r i n g unit to room temperature before starting. Assure the
use of the proper weight pump oil for ambient operating
temperature.
6. MOTOR STOPS DURING OPERATION.
Step 1. Check for defective wiring.
Check wiring and correct.
3-10

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