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TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 2 Download

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TM 9-2320-387-24-2 32-4. FRAMEINSPECTION AND F&PAIR I This taskcovers: a. GeneralInformation b. Powertrain Lift Sling Installation c Inspection d. Preparationand Materials e. Repair Procedures f. Powertrain Lift Sting Removal INITIAL SETUP: TOOIS General mechanic’s tool kit: automotive (Appendix B, Item 1) Materials/Parts Cotter pin (Appendix G, Item 27) Powertrain lift sling (Appendix D, Figs. 72,73) Manual References TB 750-98-23 TM 9-2320-387-10 TM 9-2320-387-24P TM 9-237 TM 43-0139 EquipmentCondition l Vehicle mission equipment removed and stowed (TM 9-2320-387-101. l Vehicle undercarriage clean and free of mud and debris (TM 9-2320-387-10). General Safety Instructions l When using power-driven equipment to straighten frames, all personnel must stand clear. l Shim material must be under jackstands. l Ensure shoulder bolts have a raised metal 10.9 material strength indicator on the head of the bolts. l Do not bulk heat frame rails to remove bends and/or buckles. Maintenance Level General support a. GeneralInformation 1. 2. 3. 4. 5. 6. 7. 8. Frame rails are constructed by arc-welding two C-channels of preformed steel together to form a box-cross section. 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. 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. 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. Mechanical forces involved in frame straightening can lead to safety problems, which all personnel must constantly consider. The removal of frame constraints (loosening of crossmember and bracket fastenings) is critical to allow enough freedom of movement when straightening frame. 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. For ease of frame maintenance, use powertrain lift sling. (Refer to task b.) 32-2