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Table 3-4. Air System Troubleshooting
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TM-5-6640-213-14 Laboratory Air Mobile Aviation Fuel NSN
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PUMP VIBRATES OR OPERATES NOISILY.
TM 5-6640-213-14
Table 3-4. Air System Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. PUMP FAILS TO DELIVER AIR AT PROPER PRESSURE.
Step 1. Check if motor speed low.
Check electrical system and correct applicable
defect.
Step 2. Check if excessive oiling or heavy oil causes a
vane or vanes to stick in rotor.
Flush the pump as indicated in sub para. (3) above.
Step 3. Check for leaks in system.
Check entire system (piping, hose, fittings, valves,
seals, and other components) and correct defect.
Step 4. Check for clogged inlet or outlet parts.
Inspect inlet and outlet parts. Make correction
as necessary,
Step 5. Negative side of system not vented to atmosphere
causes low pressure on positive side of system.
Insure proper venting of negative side of system
.
when positive side is being used.
Step 6. Positive side of system not vented to atmosphere
causes inefficient negative pressure.
Insure proper venting of positive side of system
when negative side is being used.

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