TM-9-2320-272-24-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4
JUNE 1998
TM-9-2320-272-24-2 - Page 110 of 991
TM 9-2320-272-24-2
3-259. CARGO SPARE TIRE CARRIER (M923A1/A2, M925A1/A2, M927A1/A2,
M928A1/A2) REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
APPLICABLE MODELS
PERSONNEL REQUIRED
M923A1/A2, M925A1/A2, M927A1/A2,
Two
M928A1/A2
REFERENCES (TM)
TOOLS
TM 9-2320-272-10
General mechanic’s tool kit (Appendix E, Item 1)
TM 9-2320-272-24P
Lifting device
Prybar
EQUIPMENT CONDITION
Utility chain
Parking brake set (TM 9-2320-272-10).
MATERIALS/PARTS
Spare tire removed (TM 9-2320-272-10).
Carrier access step removed (para. 3-260).
Ten locknuts (Appendix D, Item 294)
Forward cargo rack removed (TM 9-2320-272-10).
Two locknuts (Appendix D, Item 291)
1.
Remove locking pin (18) and retaining pin (19) from boom extension (1).
2.
Remove boom extension (1) from boom (2).
3.
Remove four locknuts (4), screws (3), and boom (2) from boom support (17). Discard locknuts (4).
4.
Remove two locknuts (5), washers (7), screws (6), and washers (7) from muffler support bracket (8)
and carrier base (14). Discard locknuts (5).
5.
Install utility chain around upper part of carrier base (14) and attach to a suitable lifting device.
6.
Remove four locknuts (13) and screws (10) from muffler support (9) and carrier base (14). Discard
locknuts (13).
7.
Remove two locknuts (12), screws (16), washers (15), and carrier base (14) from left frame rail
bracket (11). Discard locknuts (12).
8.
Remove utility chain from carrier base (14).
1.
Install utility chain around upper part of carrier base (14) and attach to a suitable lifting device.
2.
Using lifting device lift carrier base (14), lower onto vehicle, and align carrier base (14) with muffler
support (9) while installing four screws (10) and new locknuts (13).
3.
Using a prybar to align carrier base (14) with left frame rail bracket (11), install two washers (15),
screws (16), and new locknuts (12).
4.
Remove lifting device and utility chain from carrier base (14).
5.
Install two washers (7), screws (6), washers (7), and new locknuts (5) on muffler support bracket (8)
and carrier base (14).
6.
Install boom (2) on boom support (17) with four screws (3) and new locknuts (4).
7.
Install boom extension (1) on boom (2).
8.
Install retaining pin (19) and locking pin (18) in boom extension (1) and boom (2).
3-718
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