TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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TM 9-2320-280-34 17-80 Change 1 17-16. TRANSMISSION CASE REPAIR (4L80-E) This task covers: a. Cleaning b. Inspection a. Cleaning NOTE For general inspection procedures, refer to para. 2-14. 1. Inspect all oil passages and bores for cracks, leaks, holes, and burrs. Use soft stone or crocus cloth to remove burrs. 2. Use helicoils to repair damaged threads. 3. Inspect bores for holes or pits as leakage paths. Replace transmission case (1) if holes or pits are present. 4. Inspect anchor pins (4) for looseness. Replace anchor pins (4) if damaged or loose. 5. Inspect internal splines, lugs, and snapring grooves for cracks, breaks, and burrs. Repair minor burrs. Replace damaged transmission case (1). 6. Remove retaining ring (7) and replace seal assembly (6) using seal installer. 7. Inspect plugs (5), cooler fittings (2), and vent pipe (3). Replace damaged parts. 8. Inspect oil multilip seal (8) for damage. Replace if damaged. 9. Inspect bolt holes (9) for damage. Replace transmission case (1) if holes (9) are damaged. b. Inspection INITIAL SETUP: Applicable Models M997A2, M1025A2, M1035A2, M1043A2, M1045A2, M1097A2, M1123 Tools General mechanic’s tool kit: automotive (Appendix G, Item 1) Special Tools Seal installer (Appendix G, Item 39) Manual References TM 9-2320-280-24P 1. Remove transmission case (1) from transmission holding fixture. ________ WARNING ________ When steam cleaning, protective clothing must be used. Failure to do this may cause serious injury. 2. Thoroughly steam clean transmission case (1). ________ WARNING ________ Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use only with effective chip guarding and personal protective equipment (goggles/shield, gloves, etc.). 3. Blow all dirt and cleaning solution from transmission case (1) with compressed air. NOTE Work area should be well-ventilated, clean, and free from blowing dirt and dust. Equipment Condition Transmission disassembled into subassemblies (para. 17-14). General Safety Instructions ______________________ • Protective clothing must be used when steam cleaning. • Compressed air for cleaning purposes will not exceed 30 psi (207 kPa). Maintenance Level _______________ General support