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 820 of 991
TM 9-2320-272-24-2
4-18. FRONT GEARCASE COVER MAINTENANCE
THIS TASK COVERS:
a. Removal
d. Assembly
b. Disassembly
e. Installation
c. Cleaning and Inspection
INITIAL SETUP:
APPLICATION MODELS
M939/A1
REFERENCES (TM)
TM 9-2320-272-24P
TOOLS
EQUIPMENT CONDITION
General mechanic’s tool kit (Appendix E, Item 1)
Mechanical puller (Appendix E, Item 103)
Outside micrometer (Appendix E, Item 80)
Torque wrench (Appendix E, Item 145)
Arbor press
Mandrel
l
Engine mounted on repair stand (para. 4-9).
l
Engine accessory drive pulley removed
(para. 4-26).
l
Water pump removed (para. 4-29).
MATERIALS/PARTS
Sixteen lockwashers (Appendix D, Item 354)
Oil seal (Appendix D, Item 498)
Oil seal (Appendix D, Item 499)
Gasket (Appendix D, Item 169)
Shims (Appendix D, Item 651)
O-ring (Appendix D, Item 440)
Grease (Appendix C, Item 28)
Lubricating oil (Appendix C, Item 50)
Crocus cloth (Appendix C, Item 20)
1.
Remove screw (16) and washer (17) from crankshaft flange (18).
2.
Install screw (16) in crankshaft (19) three turns.
3.
Using puller, remove crankshaft flange (18) from crankshaft (19).
4.
Remove screw (16) from crankshaft (19).
NOTE
l
Gearcase mounting screws are of different lengths. Tag screws
for installation.
l
Gearcase cover is mounted with screw-assembled washers for
late model engines.
5.
Remove screw (6), lockwasher (7), washer (5), and adjusting link (4) from gearcase cover (3). Discard
lockwasher (7).
6.
Remove four screws (12), washers (11), and brace (13) from engine block (1).
7.
Remove fifteen screws (10), lockwashers (9), washers (8), gearcase cover (3), and gasket (2) from
engine block (1). Discard lockwashers (9) and gasket (2).
b. Disassembly
1.
Remove crankshaft seal (14) from gearcase cover (3). Discard crankshaft seal (14).
2.
Remove accessory drive seal (15) from gearcase cover (3). Discard accessory drive seal (15).
4-138
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