TM-9-2320-272-23-5

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

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 5 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-5 - Page 339 of 623

REMOVAL

WARNING

Air pressure may create airborne debris. Use eye protection. Failure to comply may result in

injury or death to personnel.

NOTE

•

There are three relief safety valves, one for each axle. Relief safety valves are mounted

the same and perform the same function. This procedure covers maintenance of one

relief valve.

•

When removing air lines, plug ends and tag for installation.

•

Perform Steps (1) and (2) for front axle relief safety valve.

1.

Disconnect air lines (Figure 1, Items 15, 17, and 19) from connectors (Figure 1, Items 14 and 16) and elbow

(Figure 1, Item 21).

2.

Remove sleeve (Figure 1, Item 20), elbow (Figure 1, Item 21), connectors (Figure 1, Item 14 and 16), and

reducers (Figure 1, Items 13 and 18) from relief safety valve (Figure 1, Item 9). Discard sleeve.

NOTE

Perform Steps (3) and (4) for forward-rear axle relief safety valve.

3.

Disconnect air lines (Figure 1, Items 1, 5, 8, and 11) from tee (Figure 1, Item 3) and elbows

(Figure

1,

Items

7

and

12).

4.

Remove sleeves (Figure 1, Items 2 and 4), tee (Figure 1, Item 3), elbows (Figure 1, Items 7 and 12), and

reducers (Figure 1, Items 6 and 10) from relief safety valve (Figure 1, Item 9). Discard sleeves.

NOTE

Perform Steps (5) and (6) for rear-rear axle relief safety valve.

5.

Disconnect air lines (Figure 1, Items 22, 27, and 30) elbows (Figure 1, Items 23, 25, and 29)

6.

Remove sleeve (Figure 1, Item 26), elbows (Figure 1, Items 23, 25, and 29), and reducers

(Figure

2,

Items

24

and

28) from relief safety valve. Discard sleeve.

TM 9-2320-272-23-5

0809

0809-2