TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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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