TM-9-2320-272-24-3
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4
JUNE 1998
TM-9-2320-272-24-3 - Page 652 of 799
4-195. INNER
TM 9-2320-272-24-3
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
APPLICABLE MODELS
M963/A1/A2
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Lifting device
Chains
MATERRALS/PARTS
Cotter pin (Appendix D, Item 67)
Eight lockwashers (Appendix D, Item 350)
PERSONNEL REQUIRED
TWO
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
Parking brake set (TM 9-2320-272-10).
Boom removed (para. 4-194).
GENERAL SAFETY INSTRUCTION
All personnel must stand clear during hoisting
operations.
Inner boom must be properly supported.
All personnel must stand clear during hoisting operations. A
snapped cable, or shifting or swinging load, may cause injury to
personnel.
NOTE
Extension cylinder will be removed and installed with the inner
boom during this procedure.
1.
Remove cotter pin (5) and pin (4) from extension cylinder (6) and outer boom (3). Discard cotter pin (5).
2.
Remove eight screws (7), lockwashers (8), and two boom stops (9) from outer boom (3). Discard
lockwashers (8).
Inner boom must he supported at sheave to prevent tilting until
hoist chain can be properly positioned around inner boom or injury
to personnel may result.
3.
Attach lifting device to sheave (1) of inner boom (2).
4.
While assistant monitors and adjusts lifting device (1), slowly pull inner boom (2) out of outer
boom (3) until utility chain can be positioned around inner boom (2).
NOTE
If only one lifting device is available, support must be provided
under sheave end of inner boom while transferring lifting hook to
utility chain on inner boom.
5.
Attach lifting device to utility chain on inner boom (2) and remove inner boom (2) from outer
boom (3).
6.
Place inner boom (2) on jack stands and remove lifting device and utility chain from inner boom (2).
4-916
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