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 620 of 836
5-105. DUMP
TM 9-2320-272-24-4
THIS TASK COVERS:
a.
Removal
d. Assembly
b.
Disassembly
e. Installation
c.
Cleaning and Inspection
INITIAL SETUP:
APPLICABLE MODELS
M929/A1/A2, M930/A1/A2
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Spring tester (Appendix E, Item 131)
Soft-faced hammer
Outside micrometer (Appendix E, Item 80)
Inside micrometer (Appendix E, Item 83)
Torque wrench (Appendix E, Item 146)
MATERIALS/PARTS
Eight lockwashers (Appendix D, Item 393)
Preformed packing (Appendix D, Item 511)
O-ring (Appendix D, Item 466)
Cotter pin (Appendix D, Item 75)
Cap and plug set (Appendix C, Item 14)
Lint-free cloth (Appendix C, Item 21)
Clean hydraulic oil (Appendix C, Item 35)
WARNING
Ensure dump control is in neutral and not moved. Injury to
personnel may result if lift cylinder is operated when not secured.
REFERENCES (TM]
LO 9-2320-272-12
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
Dump body removed (para. 4-144).
Dump roller arms removed (para. 5-104).
GENERAL SAFETY INSTRUCTIONS
Do not operate dump controls when dump body is
removed.
NOTE
A 4x4 block of wood is recommended for use as support.
1.
Raise hoist cylinders (3) and (9) from subframe (4) and place wood support between sub-
frame (4) and cylinders (3) and (9).
2.
Remove four screws (2), lockwashers (1), two upper crosshead retainers (5), lower crosshead
retainers (7), and crosshead (8) from two piston rods (6). Discard lockwashers (1).
CAUTION
Plug all hydraulic lines or openings to prevent dirt from entering
and damaging components.
NOTE
Cross fitting to hoist cylinder hoses must be disconnected from
cross fittings first. Then hoses can be removed from hoist
cylinders.
Have drainage containers ready to catch oil.
Tag all parts for installation.
3.
Disconnect hydraulic hoses (18) and (14) from right cross fitting (17).
5-614
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