Purging Air from Piston Pump

TM 10-3930-673-20-2

NOTE

Purging air from piston pump or tandem

gear pump is normally necessary only

under the following conditions:

When hoses between pumps and hydraulic

reservoir are disconnected.

TR00003

When the hydraulic reservoir is drained

and refilled.

When you suspect that air in pump

cavities is causing hydraulic system

malfunction.

(1)

Purge air from piston pump (1).

(a)

Loosen but do not remove hose (2)

from reducer (3) at tee (4).

(b)

Place suitable container under pump to

catch oil spilled during purging.

(c)

Place auxiliary fuel shut-off switch in

"OFF" position

(TM 10-3930-673-10).

NOTE

A solid stream of oil will flow out of

loosened hose when air is purged from

pump.

(d)

Crank engine until solid stream of oil

flowing from hose (2) at reducer (3).

While continuing to crank engine, have

assistant tighten hose (2).

(e)

Stop cranking engine. Place auxiliary

fuel shut-off switch in "ON" position

TR00971

(TM 10-3930-673-10).

NOTE

If pump will not pump oil after purging, further troubleshooting is required. Refer to (Refer to Para

2-12).

(2)

Check hydraulic oil level (TM 10-3930-673-10).

(3)

Fill hydraulic reservoir as required (TM 10-3930-673-10).

(4)

Check for leaks (TM 10-3930-673-10).

18-3