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PUMP FAILS TO DELIVER AIR AT PROPER PRESSURE. - TM-5-6640-213-140090
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TM-5-6640-213-14 Laboratory Air Mobile Aviation Fuel NSN
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Element replacement
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. - Continued
Step 7. Incorrect top clearance between rotor and pump
housing.
Disassemble (sub para. (4) above) and realign rotor
(sub para. (5) above).
4. PUMP VIBRATES OR OPERATES NOISILY.
Step 1. Check for loose mounting.
Tighten pump mounting bolts.
Step 2. Check foreign matter which has entered the
pump.
Clean the pump by flushing (sub para. (3) above).
Step 3. Check for foreign matter which has entered the
pump and cannot be removed by flushing.
Disassemble and clean pumps (sub para. (4) above).
Step 4. Rotor and housing are touching causing a metallic
clanging.
Disassemble the pump (sub para. (4) above) and
realign rotor (sub para. (5) above).
5. PROPER CLEARANCE BETWEEN ROTOR AND PUMP HOUSING
CANNOT BE MAINTAINED.
Worn paper gaskets on motor side of the pump body.
Disassemble the pump (sub para. (4) above), remove
and replace gaskets.
3-19

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