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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 Table 14-1. Mechanical Troubleshooting (Cont’d). MALFUNCTION TEST OR INSPECTION 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 5. Air-check direct clutch piston for proper operation. If piston exhibits excessive leakage, proceed to step 6. If operation is normal, proceed to step 7. 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! 25. 3-4 SHIFT FIRM OR ROUGH Step 1. If oil pressure in (fi> (overdrive) at 1,000 rpm 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 piston rings and broken or missing spring (para. 28-17) if damaged. NOTE Ensure control valve makes contact; clean electrical connections. Step 3. Check control valve for proper electrical connection. Replace control valve if stuck in off position (para. 28-17). 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 4. 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 5. Check center support and second oil ring for damage. Repair center support (para. 28-9) if damaged. Step 6. Perform steps 6 and 7 of malfunction 19. END OF TESTING! 26. NO ENGINE BRAKING - THIRD GEAR Step 1. Check front servo piston for leaking oil rings and damaged piston. Replace damaged components (para. 28-15). Step 2. Check front accumulator piston for leaking oil rings and damaged piston. Replace damaged or worn components (para. 28-17). Step 3. Check front band for damage and proper installation. Replace front band (para. 28-14) if damaged. END OF TESTING! 14-12