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 Table 14-1. Mechanical Troubleshooting (Cont’d). MALFUNCllON TEST OR INSPECllON Step 6. Check direct clutch piston, plates, and release springs for damage or incorrect assembly. Repair direct clutch (para. 28-10) if damaged. step 7. Check transmission case passages for leaks. Replace transmission (para. 19-3) if case is damaged. END OF TESTING! 22. 2-3 SHIFT FIRM OR ROUGH step 1. If oil pressure in @) (overdrive) at 1,000 r-pm is normal, proceed to step 2. If oil pressure is high, proceed to step 5. step 2. Check front accumulator for damaged piston, rings, and broken or missing spring. Check valve to accumulator feed for obstructions. Replace control valve (para. 28-17) if damaged. WARNING Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use only with effective chip guarding and personnel protective equipment (goggles, shield, gloves, etc.). step 3. Air-check direct clutch piston for leak to outer area of clutch piston. Check center piston seal for damage. Repair direct clutch (para. 28-10) if damaged. step 4. Check center support and second oil ring for damage. Repair center support (para. 28-9) if damaged. step 5. Perform steps 6 and 7 of malfunction 19. END OF TESTING! 23. NO 3-4 UPSHIFT OR DEWED UPSHIFT NOTE If malfunction only occurs at or near full throttle, check engine timing for proper adjustment and check exhaust system for restrictions. step 1. Check control valve for a stuck 2-3 valve and misaligned or damaged gaskets. Replace control valve (chapter 28) if damaged. step 2. Check direct clutch for damage or burned clutch plates. Repair direct clutch (para. 28-10) if damaged. END OF TESTING! 24. 3-4 SHIFT SOFT OR SUPS step 1. Step 2. Step 3. Step 4. If oil pressure in @ (overdrive) at 1,000 rpm is low, proceed to step 2. If oil pressure is normal, proceed to step 4. Perform steps 3 through 8 of malfunction 18. Perform steps 6 and 7 of malfunction 19. Check front servo for broken or missing spring and leak at servo pin. Repair front servo (para. 28-15) if damaged. 14-11