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

  TM-9-2320-272-23-3 - Page 901 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.
CAUTION
When disconnecting air lines and hoses, plug all openings to prevent dirt from entering and
causing damage to internal parts. Remove all plugs prior to installation.
NOTE
•
Tag lines and fittings for installation.
•
Mark fitting direction for installation.
1.
Remove locknut (Figure 1, Item 23), screw (Figure 1, Item 26), and clamp (Figure 1, Item 25) from front step
brace (Figure 1, Item 24). Discard locknut.
2.
Remove tiedown straps (Figure 1, Item 29) from air lines as necessary. Discard tiedown straps.
3.
Remove eight screws (Figure 1, Item 14), lockwashers (Figure 1, Item 15), and access box cover
(Figure
1,
Item 13) from step box access (Figure 1, Item 8). Discard lockwashers.
4.
Loosen nut (Figure 1, Item 28) and remove primary balance air line (Figure 1, Item 27) from top adapter
(Figure
1, Item 1) on inversion valve (Figure 1, Item 7).
5.
Loosen nut (Figure 1, Item 16) and remove delivery air line (Figure 1, Item 17) from right side elbow
(Figure
1, Item 12) on inversion valve (Figure 1, Item 7).
6.
Loosen nut (Figure 1, Item 31) and remove secondary control air line (Figure 1, Item 30) from left side top
elbow (Figure 1, Item 2) on inversion valve (Figure 1, Item 7).
7.
Loosen nut (Figure 1, Item 21) and remove supply air line (Figure 1, Item 22) from left side bottom elbow
(Figure
1, Item 3) on inversion valve (Figure 1, Item 7).
8.
Remove two locknuts (Figure 1, Item 5), washers (Figure 1, Item 6), screws (Figure 1, Item 10), washers
(Figure
1, Item 9), and inversion valve (Figure 1, Item 7) from inside of step box access (Figure 1, Item 8).
Discard locknuts.
9.
Remove elbow (Figure 1, Item 12) from delivery port (Figure 1, Item 18) on right side of inversion valve
(Figure
1, Item 7).
10.
Remove bottom elbow (Figure 1, Item 3) from supply port (Figure 1, Item 19) on left side of inversion valve
(Figure 1, Item 7).
11.
Remove top elbow (Figure 1, Item 2) from secondary control port (Figure 1, Item 4) on left side of inversion
valve (Figure 1, Item 7).
12.
Remove adapter (Figure 1, Item 1) from primary balance port (Figure 1, Item 11) on top of inversion valve
(Figure 1, Item 7).
13.
Remove exhaust checkvalve (Figure 1, Item 20) from inversion valve (Figure 1, Item 7).
TM 9-2320-272-23-3
0459
0459-2


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