TM 9-4120-407-14
NOTE
Inability to reach and hold 29 inches of mercury may indicate either
a leak or a problem with the vacuum pump.
(8) Continue running vacuum pump for one more hour, while observing the gauge. If gauge needle
moves back and forth, you have a leak which must be located and corrected. See paragraph 4-16.
(9) Close Air Conditioner discharge and suction service valves.
(10) Close service manifold high pressure gauge, compound gauge, and vacuum valves.
(11) Stop vacuum pump.
(12) Disconnect the vacuum hose from vacuum pump.
NOTE
FOLLOW-ON MAINTENANCE:
4-41