PUMP FAILS TO DELIVER AIR AT PROPER PRESSURE.

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.