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

Page 1067 of 1555

TM 9-2320-387-24-2 28-5. TRANSMISSION CASE MAINTENANCE This task covers: a. Cleaning b. Inspection INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Special Tools Seal installer (Appendix B, Item 61) Materials/Parts Crocus cloth (Appendix C, Item 22) Manual References TM 9-2320-387-24P Equipment Condition Transmission disassembled into subassemblies (para. 28-3). General Safety Instructions l Protective clothing must be used when steam cleaning. l Compressed air for cleaning purposes will not exceed 30 psi (207 kPa). Maintenance Level General support a. Cleaning NOTE Work area should be well-ventilated, clean, and free from blowing dirt and dust. 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. b. Inspection 1. 2. 3. 4. 5. 6. 7. 8. 9. NOTE For general inspection procedures, refer to para. 2-15. Inspect all oil passages and bores for cracks, leaks, holes, and burrs. Use soft stone or crocus cloth to remove burrs. Use helicoils to repair damaged threads. Inspect bores for holes or pits as leakage paths. Replace transmission case (1) if holes or pits are present. Inspect anchor pins (4) for damage or looseness. Replace anchor pins (4) if damaged or loose. Inspect internal splines, lugs, and snapring grooves for cracks, breaks, and burrs. Repair minor burrs. Replace damaged transmission case (1). Remove retaining ring (7) and replace seal assembly (6) using seal installer. Inspect plugs (51, cooler fittings (21, and vent pipe (3). Replace damaged parts. Inspect oil multilip seal (8) for damage. Replace if damaged. Inspect bolt holes (9) for damage. Replace transmission case (1) if holes (9) are damaged. 28-22