TM-9-2320-272-24-2

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4

JUNE 1998

TM-9-2320-272-24-2 - Page 898 of 991

4-31. AIR

TM 9-2320-272-24-2

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

Disconnect governor air line (3) from elbow (2) on unloader valve body (1).

Disconnect alcohol evaporator air line (4) from elbow (10) on compressor inlet (9).

Disconnect supply reservoir air line (6) from adapter (5) on compressor head (11).

Remove elbow (10) from compressor inlet (9), elbow (2) from valve body (1), and adapters (5) from

compressor head (11).

Loosen two clamps (8) and remove air intake tube (7) from compressor inlet (9).

Remove screw-assembled washer (20) and ground cable (19) from air compressor (18).

Remove two screws (21) from accessory drive housing (13).

Remove two nuts (15), lockwashers (16), washers (17), screws (12), and washers (17) from accessory

drive housing (13). Discard lockwashers (16).

Remove screw-assembled lockwashers (23) and (27) and washers (22) and (26) from bracket (25) and

engine (24). Discard screw-assembled lockwashers (23) and (27).

Loosen screw (28), rotate bracket (25) downward, and remove air compressor (18) and gasket (14)

from accessory drive housing (13). Discard gasket (14). Clean gasket remains from mating surfaces.

Remove drive coupling (29) from accessory drive housing (13).

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