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 987 of 1469

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.

NOTE

•

Double check valve No. 5 is used with airbrake kits on M931/A1/A2 and M932/A1/A2

model vehicles. It is located inside the left frame rail in back of the stoplight switch.

•

Tag air lines for installation.

1.

Disconnect two wires (Figure 1, Item 6) from stoplight switch (Figure 1, Item 5).

2.

Disconnect double check valve No. 5 control line (Figure 1, Item 8) from adapter tee (Figure 1, Item 9).

3.

Disconnect protection valve control line (Figure 1, Item 10) and trailer handbrake control line

(Figure

1,

Item

7) from double check valve No. 2 (Figure 1, Item 3).

4.

Remove locknut (Figure 1, Item 2), screw (Figure 1, Item 1), and double check valve No. 2 (Figure 1, Item 3)

from left frame rail (Figure 1, Item 4). Discard locknut.

TM 9-2320-272-23-3

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