TM-9-2320-272-24-4
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4
JUNE 1998
TM-9-2320-272-24-4 - Page 542 of 836
TM 9-2320-272-24-4
5-81. CEILING AIR DUCTS REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITlAL SETUP:
APPLICABLE MODELS
REFERENCES (TM)
M934/A1/A2
TM 9-2320-272-10
TOOLS
TM 9-2320-272-24P
General mechanic’s tool kit (Appendix E, Item 1)
EQUIPMENT CONDITION
MATERIALS/PARTS
l
Parking brake set (TM 9-2320-272-10).
Primer (Appendix C, Item 57)
l
Van sides fully expanded and secured
(TM 9-2320-272-10).
PERSONNEL REQUIRED
l
Ceiling rear cover removed (para. 5-80).
TWO
l
Ceiling filler and side panels removed (para. 5-79).
SPECIAL ENVIRONMENTAL CONDITIONS
Vehicle must be on a level surface.
1.
Remove fifty-two screws (6) and two enclosures (7) from air ducts (3) and (5).
2.
Remove fourteen screws (4) from air ducts (3) and (5) and support (1).
3.
Remove forty-two screws (2) and air duct (3) from ceiling (9).
4.
Remove eighteen screws (8) and air duct (5) from ceiling (9).
5.
Remove nine screws (10) and support (1) from ceiling (9).
6.
Remove fifty-two screws (20) and two enclosures (19) from air ducts (17) and (21).
7.
Remove four screws (16) from air duct (17) and support (13).
8.
Remove six screws (18) from air duct (21) and support (13).
9.
Remove twenty-six screws (15) and air ducts (17) and (21) from ceiling (9).
10.
Remove ten screws (14) and support (13) from ceiling (9).
11.
Remove seven screws (12) and support (11) from ceiling (9).
b. Installation
1.
Install support (11) on ceiling (9) with seven screws (12).
2.
Install support (13) on ceiling (9) with ten screws (14).
3.
Install air ducts (17) and (21) on ceiling (9) with twenty-six screws (15).
4.
Install air duct (21) on support (13) with six screws (18).
5.
Install air duct (17) on support (13) with four screws (16).
6.
Install two enclosures (19) on air ducts (21) and (17) with fifty-two screws (20).
7.
Position support (1) over bow of roof frame and install on ceiling (9) with nine screws (10).
8.
Install air duct (5) on ceiling (9) with eighteen screws (8).
9.
Install air duct (3) on ceiling (9) with forty-two screws (2).
10.
Install air ducts (3) and (5) on support (1) with fourteen screws (4).
11.
Install two enclosures (7) on air ducts (5) and (3) with fifty-two screws (6).
5-536
NOTE
Insulate areas of dissimilar metal-to-metal contact with zinc
chromate primer.
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