TM-9-2320-272-23-3

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 3 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-3 - Page 327 of 1469

MAIN PRESSURE AND GOVERNOR PRESSURE TEST

WARNING

Ensure transmission-to-transfer case propeller shaft has been removed before performing

this test. If test is performed with propeller shaft installed, wheel blocks (chocks) will not

prevent vehicle from rolling. Failure to comply may result in injury or death to personnel.

1.

Remove transmission-to-transfer case propeller shaft (WP

0403).

CAUTION

Before disconnecting transmission pressure lines, clean surrounding surfaces and plug all

openings to prevent entry of dirt or debris into transmission. Damage will occur if dirt or debris

enters transmission.

NOTE

•

Transmission-to-transfer case propeller shaft removal allows transmission output shaft

to rotate to build up governor oil pressure. Upshift will not occur without

governor

pressure.

•

Have drainage container ready to catch oil.

•

Use drain pans to retain leaking/draining fluids. Refer to local procedures and plans for

preventing and responding to fluid spills or leaks. Comply with local regulations when

disposing of clean up material and leaked and spilled fluids.

2.

Disconnect main pressure line (Figure 4, Item 1) from adapter (Figure 4, Item 2).

3.

Disconnect governor pressure line (Figure 4, Item 4) from adapter (Figure 4, Item 3).

TM 9-2320-272-23-3

0374

0374-8