TM-9-2320-272-23-2

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

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-2 - Page 1359 of 1417

REMOVAL

1.

Disconnect wires (Figure 1, Items 6 and 7) from horn solenoid (Figure 1, Item 5).

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.

2.

Disconnect air line (Figure 1, Item 4) from elbow (Figure 1, Item 3).

3.

Remove elbow (Figure 1, Item 3) from horn solenoid (Figure 1, Item 6).

NOTE

Horn solenoid fitting may become disconnected from horn solenoid during removal. Horn

solenoid and fitting are replaced as an assembly.

4.

Remove horn solenoid (Figure 1, Item 6) from horn (Figure 1, Item 2).

5.

Remove two nuts (Figure 1, Item 10), wire (Figure 1, Item 9), two lockwashers (Figure 1, Item 11), screws

(Figure 1, Item 1), and horn (Figure 1, Item 2) from bracket (Figure 1, Item 14). Discard lockwashers.

NOTE

•

Assistant will help with Step (6).

•

Pull insulation away from inside cab firewall to allow access to nut.

6.

Remove screw-assembled washer (Figure 1, Item 8), nut (Figure 1, Item 15), washer (Figure 1, Item 13), screw

(Figure 1, Item 12), and bracket (Figure 1, Item 14) from firewall (Figure 1, Item 16).

TM 9-2320-272-23-2

0343

0343-2