PUMP VIBRATES OR OPERATES NOISILY.

TM 5-6640-213-14

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.

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