PUMP FAILS TO DELIVER AIR AT PROPER PRESSURE.

TM 5-6640-213-14

Table 3-3. Water System Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Check if current overload causes circuit breaker switch No. 3 to

Step 2.

open.

Locate and correct cause for overload. Close circuit breaker

and restart motor.

Check if mechanical or electrical overload causes safety overload

Step 3.

device or motor to automatically turn current off.

Locate and correct cause for overload. Allow unit to CoOl before

restarting.

7. PUMP FAILS TO DELIVER AIR AT PROPER PRESSURE.

Step 1.

Motor speed too 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.

Step 3.

Check for leaks in system.

Check entire system (piping, hose, fittings, valves, seals and

other components) and correct defect.

Step 4.

Check if inlet or outlet ports clogged.

Inspect inlet and outlet ports. Make necessary corrections.

Step 5.

Check if negative side of system not vented to atmosphere causes

low pressure on positive side of system not vented to atmosphere

causes inefficient negative pressure.

Ensure proper venting of negative side of system when positive

side is being used. Ensure proper venting of positive side of

system when negative side is being used.

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