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 836 of 991
TM 9-2320-272-24-2
4-20. ROCKER LEVER HOUSING AND PUSH TUBES MAINTENANCE
THIS TASK COVERS:
a. Removal
d. Assembly
b. Disassembly
e. Installation
c. Cleaning and Inspection
APPLICABLE MODELS
PERSONNEL REQUIRED
M939/A1
TWO
SPECIAL TOOLS
Rocker lever bushing block and mandrel
(Appendix E, Item 116)
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Inside micrometer (Appendix E, Item 82)
Outside micrometer (Appendix E, Item 80)
Radius gauge, 1/4-in. (Appendix E, Item 136)
Bore gauge (Appendix E, Item 136)
Torque wrench (Appendix E, Item 144)
Brass drift
Arbor press
MATERIALS/PARTS
Three gaskets (Appendix D, Item 187)
Two locknuts (Appendix D, Item 294)
Six O-rings (Appendix D, Item 473)
Three gaskets (Appendix D, Item 172)
Lubrication oil (Appendix C, Item 50)
Prussian blue (Appendix C, Item 54)
Drycleaning solvent (Appendix C, Item 71)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
l
Parking brake set (TM 9-2320-272-10).
l
Engine lift eyes removed (para. 4-11).
l
Intake manifold removed (para. 4-24).
l
Engine access cover fin cab) removed (para. 4-13).
GENERAL SAFETY INSTRUCTIONS
l
Keep fire extinguisher nearby when using
drycleaning solvent.
l
Drycleaning solvent is flammable and toxic. Do
not use near an open flame.
NOTE
Perform step 1 for removing rocker lever housing cover closest to firewall.
1.
Remove two locknuts (5), washers (4), and rubber cushions (3) from left and right cab A-posts (1).
Discard locknuts (5).
NOTE
Assistant will help with step 2.
2.
Turn left and right screw jacks (6) to raise cab above frame (2) 4-5 in. (102-127 mm).
3.
Loosen hose clamps (10) and remove hose (9) from breather (8).
NOTE
Perform step 4 for late model engine only.
4.
Loosen two clamps (14) and remove breather tube (15) from breather (8) and elbow (16).
NOTE
Rocker lever housings are mounted with screw-assembled lockwashers
on late model engine.
5.
Remove fifteen screws (11), three rocker covers (7), and gaskets (12) from rocker lever housings (13).
Discard gaskets (12) and clean gasket remains from mating surfaces.
4-154
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