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

  TM-9-2320-272-24-3 - Page 658 of 799

4-197. BOOM
TM 9-2320-272-24-3
THIS TASK COVERS:
a. Removal
b. Disassembly
c.
Cleaning and Inspection
d. Assembly
e. Installation
INITIAL SETUP:
APPLICABLE MODELS
REFERENCES (TM)
M936/A1/A2
TM 9-2320-272-10
TOOLS
General mechanic’s tool kit (Appendix E, Item
Arbor press
MATERIALS/PARTS
Eight lockwashers (Appendix D, Item 350)
Two woodruff keys (Appendix D, Item 729)
Six lockwashers (Appendix D, Item 377)
Drycleaning solvent (Appendix C, Item 71)
EQUIPMENT CONDITION
Parking brake set (TM 9-2320-272-10).
Inner boom removed (para. 4-195).
GENERAL SAFETY INSTRUCTIONS
Keep fire extinguisher nearby when using
drycleaning solvent.
Drycleaning solvent is flammable and toxic. Do
not use near open flame.
NOTE
Both boom rollers are removed in the same way with boom on or
off the vehicle. This procedure applies to the bottom boom roller
with inner boom removed.
Remove six screws (3), lockwashers (4), and roller (1) from outer boom (2). Discard lockwashers (4).
1.
Thoroughly clean exterior of boom roller (1).
2.
Remove eight screws (5), lockwashers (6), left and right mounting caps (7), and four shims (8) from
boom roller frame (9). Discard lockwashers (6).
3.
Remove two rollers (10) and roller shaft (13) from frame (9).
4.
Remove two rollers (10) from roller shaft (13).
5.
Using an arbor press, remove roller bearings (11) from two rollers (10).
6.
Remove two woodruff keys (12) from roller shaft (13). Discard woodruff keys (12).
4-922


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