TM 10-4630-207-13&P
0008 00
TROUBLESHOOTING PROCEDURE 2
NO VACUUM/PRESSURE BUILDING IN TANK
SYMPTOM
Erratic pressure gage reading.
MALFUNCTION
Vacuum pump control in improper position.
CORRECTIVE ACTION
Place pump control in the VACUUM position when filling the tank, and in
PRESSURE position when draining the tank. Refer to WP 0005 00.
MALFUNCTION
Isolation valve closed.
CORRECTIVE ACTION
Open isolation valve during both, filling, and draining operation. Refer to
MALFUNCTION
Engine not operating at proper speed.
CORRECTIVE ACTION
Set engine throttle at 2800 RPM during tank filling VACUUM operation.
Set engine throttle at 2200 RPM during tank draining PRESSURE
operation. Refer to WP 0005 00.
MALFUNCTION
No airflow through oil catch muffler.
CORRECTIVE ACTION
Check airflow at oil catch muffler. If no airflow is noted during vacuum or
pressure cycles, the breather, or vacuum hoses may be blocked. Clean
and service the oil catch muffler as described in WP 0013 00.
0008 00-2
