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 354 of 836
TM 9-2320-272-24-4
5-51. GEAR UNIT AND MAIN SHAFT MAINTENANCE
THIS TASK COVERS:
a. Removal
d. Assembly
b. Disassembly
e. Installation
c. Cleaning and Inspection
INITIAL SETUP:
APPLICABLE MODELS
All
SPECIAL TOOLS
Gear unit lifter (Appendix E, Item 58)
Tools
General mechanic’s tool kit (Appendix E, Item 1)
Outside micrometer (Appendix E, Item 80)
Vernier caliper (Appendix E, Item 159)
Snapring pliers (Appendix E, Item 125)
MATERIALS/PARTS
Oil-soluble grease (Appendix C, Item 53)
REFERENCES (TM)
TM 9-2320-272-24P
EQUIPMENT CONDITION
Center support removed (para. 5-50).
SPECIAL ENVIRONMENTAL CONDITIONS
Work area clean and free from blowing dirt and
dust.
a. Removal
Attach gear unit lifter to gear unit main shaft (1) and remove gear unit (2) from transmission housing (3).
b. Disassembly
1.
Remove thrust washer (4), front sun gear (5), sun gear shaft (7), and thrust washer (6) from front
planetary carrier (8).
2.
Remove front planetary carrier (8) and thrust washer (9) from planetary carrier drum (10).
3.
Remove snapring (12) from ring gear (13) and lift ring gear (13) out of planetary carrier drum (10).
4.
Remove center planetary carrier (11) from planetary carrier drum (10).
5.
Remove roller bearing (14) and bearing race (15) from main shaft (18).
6.
Remove snapring (19) from main shaft (18) and slide lower planetary sun gear (20) off main shaft (18).
7.
Remove main shaft (18) from rear planetary sun gear (23).
8.
Remove center ring gear (17) and rear planetary sun gear (23) from rear planetary carrier (22).
9.
Remove snapring (16) from center ring gear (17) and slide rear planetary sun gear (23) out of center
ring gear (17).
10.
Remove snapring (21) from rear planetary carrier (22) and lift rear planetary carrier (22) out of
planetary carrier drum (10).
5-348
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