TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 1026 of 1258
TM 9-2320-280-34
21 - 4.
FRAME INSPECTION AND REPAIR
This task covers:
a.
General Information
d.
Preparation and Materials
b
Powertrain Lift Sling Installation
e.
Repair Procedures
c.
Inspection
f.
Powertrain Lift Sling Removal
INITIAL SETUP:
Tools
Equipment Condition
General mechanic's tool kit: Automotive
Vehicle stripped of mission and stowed equipment
(Appendix G, Item 1)
(TM 9-2320-280-10).
Vehicle undercarriage clean and free of mud and
Materials/Parts
debris.
Cotter pin (Appendix E, Item 8)
Powertrain lift sling (Appendix C, Fig.
14, 15)
General Safety Instructions
When using power-driven equipment to straighten
References
frames, all personnel must stand clear.
TM 9-2320-280-10
Shim material must be under jackstands.
TM 9-2320-280-20
Ensure shoulder bolts have a raised metal
TM 9-2320-280-24P
“10.9" material strength indicator on the head
TM 9-237
of the bolts
TB 750-98-23
TM 43-0139
Maintenance Level
General support
a.
General Information
1.
Frame rails are constructed by arc-welding two 'C" channels of preformed steel together to form a box-
cross section.
2.
Frame rails are internally reinforced at bolt hole locations by bushings or full cross-section spacers to
prevent channels from collapsing from attaching load.
NOTE
Crossmembers and crossmember brackets must be replaced if
damaged.
3.
The frame is made by bolting two non-identical frame rails to crossmembers.
Crossmembers are held
to more stringent dimensional tolerances and must be replaced if damaged.
4.
The type of repairs attempted will vary considerably depending on equipment, type of facilities, and
skill of available personnel.
Also the choice of procedures will be influenced by parts supply status and
the operational situation.
5.
Mechanical forces involved in frame straightening can lead to safety problems, which all personnel
must constantly keep in consideration.
6.
The removal of frame constraints (loosening of crossmember and bracket fastenings) is critical to allow
enough freedom of movement when straightening frame.
7.
The objective of a repair procedure is to return the vehicle to a mission-safe (operationally and
mechanically) condition within a reasonable time and cost expenditure.
8.
For ease of frame maintenance, use powertrain lift sling.
(Refer to para.
b.)
21-2
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