TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download
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PAR 70-71 CHAPTER 5 REPAIR AND REBUILD Section I. PRELIMINARY INSTRUCTIONS FOR POWER TRAIN OVERHAUL 70. GENERAL a. Provide Proper Equipment. Proper equipment must be available before re- build is started. This equipment includes a hoist of at least 2-ton capacity, ade- quate hand tools (par. 62) (and improvised tools, where available). wood blocks. re- ceptacles for small parts, lint-free wiping cloths, oil-soluble grease and nonharden- ing gasket cement. Refer to Table II and par. 62 for listing of special and impro- vised tools. WARNINGS ● ● ● White lead is toxic. To avoid injury, do not use white lead. Transmission and transmission com- ponents are heavy and can crush you. Have a ground guide check slings and lifting devices for cuts, breaks or wear before and during hoisting. Slings and lifting devices can break and cause injury or death. To avoid injury, do not stand under transmis- sion or components when lifting them. Fumes from burning Teflon can cause serious injury or death. Because clutch piston seal rings and step-joint seal rings are made of Teflon, do not get rid of them by burning. b. Parts to Discard. At transmission assembly, all piston seals, seal rings, pack- ings, lock washers, lock nuts, cotter pins, lock wires, lock strips and gaskets should be removed and discarded. New parts should always be supplied to replace such items. c. Avoid Component Damage. Use care avoid damage to transmission com- ponents during disassembly, cleaning, in- spection, repair and reassembly. Nicks, scratches and dents resulting from care- less handling may cause oil leakage or improper functioning. This could result in transmission failure. All defective parts must be replaced. Handling of heavy components with slings and hooks, and blocking the transmission for support in various positions, is important for safety and to prevent damage. d. Torque. All plugs, bolts, nuts and screws must be installed at the prescribed torque tightness to ensure proper assembly. Proper use of a torque wrench, and careful attention to prescribed torque, will help prevent distortion, oil leaks and stripped threads. All torque requirements for plugs, bolts, screws and nuts are found in the pertinent rebuild section and in the assembly step procedures (sec. XXXIII) which follow. 71. CLEANING RECOMMENDATIONS a. General. Cleanliness is of para- mount importance in servicing a transmis- sion. All components must be thoroughly cleaned and kept clean throughout the re- build process. Dirt can cause malfunction and possible failure of the transmission. Refer to the Appendix A, Section 4b. b. Cleaning Parts WARNING Compressed shop air will not exceed 30 psi (pounds per square inch). Regu- lator assembly must be attached to compressor. To avoid injury, use only with effective chip-guarding and per- sonal protective equipment (goggles/ faceshield, gloves, etc.). 74 Change 2