Purging Air from Tandem Gear Pump

TM 10-3930-673-20-2

18-2. HYDRAULIC SYSTEM SERVICE (CONT)

Purging Air from Tandem Gear Pump.

CAUTION

Do not attempt to purge large and small

sections of tandem gear pump separately.

Always purge both sections whenever

purging is necessary. Failure to purge

pump as directed may result in severe

damage to pump.

NOTE

Hydraulic tandem gear pump has two

sections, large and small.

The large section supplies hydraulic pressure

to boom extend cylinder, boom hoist

cylinder, and steering system.

TR01016

The small section supplies hydraulic

pressure to brake system and frame tilt

cylinder.

(1)

Purge air from tandem gear pump (5).

(a)

Loosen but do not remove hose (6) from

elbow (7).

(b)

Loosen but do not remove hose (8) from

elbow (9).

(c)

Place suitable container under tandem

gear pump (5) to catch oil spilled during

purging.

TR00972

(d)

Place auxiliary fuel shut-off switch in the

"OFF" position (TM 10-3930-673-10).

NOTE

A solid stream of oil will flow out of loosened hoses when air is purged from pump.

(e)

Crank engine until solid stream of oil flows from hoses (6) and (8). While continuing to crank engine, have

assistant tighten hoses (6) and (8).

(f)

Stop cranking engine. Place auxiliary fuel shut-off switch in "ON" position

(TM 10-3930-673-10).

18-4