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 847 of 1469

FRONT AIR COUPLINGS REMOVAL

WARNING

Do not disconnect air lines or hoses before draining air reservoirs. Small parts under pressure

may shoot out with high velocity. Failure to comply may result in injury or death to personnel.

1.

Remove dummy couplings (Figure 1, Items 1 and 15) and S-hook (Figure 1, Item 12) from air coupling

(Figure

1,

Item

2) and bracket (Figure 1, Item 5). Dummy coupling (Figure 1, Item 1) has a built-in

check

valve.

NOTE

Perform Steps (2) and (3) for emergency coupling on left side of vehicle.

2.

Remove air coupling (Figure 1, Item 2) from pipe nipple (Figure 1, Item 14).

3.

Remove pipe nipple (Figure 1, Item 14) from valve (Figure 1, Item 13).

4.

Disconnect air line (Figure 1, Item 11) from elbow (Figure 1, Item 10).

5.

Remove elbow (Figure 1, Item 10) from adapter (Figure 1, Item 4).

6.

Remove nut (Figure 1, Item 9), lockwasher (Figure 1, Item 8), adapter (Figure 1, Item 4), identification plate

(Figure 1, Item 6), and bracket (Figure 1, Item 5) from frame rail (Figure 1, Item 7). Discard lockwasher.

7.

Remove adapter (Figure 1, Item 4) from elbow (Figure 1, Item 3).

NOTE

Perform Step (8) for service coupling on right side of vehicle.

8.

Remove elbow (Figure 1, Item 3) from air coupling (Figure 1, Item 2).

NOTE

Perform Step (9) for emergency coupling on left side of vehicle.

9.

Remove elbow (Figure 1, Item 3) from valve (Figure 1, Item 13).

TM 9-2320-272-23-3

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