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 Doubleshooting (Cont’d). I MALFUNCTION TEST OR INSPECTION I 27. NO ENGINE BRAKING - SECONDGEAR step 1. Check front servo piston for leaking oil rings and damaged piston. Replace damaged components (para. 28-15). step 2. Check fTont 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! 28. NO ENGINE BRAKING - FIRST GEAR Step 1. Check for missing or incorrectly installed check balls. Replace missing check balls (chapter 28). step 2. Check transmission case for damage at check ball locations. Replace transmission (para 19-3) if damaged. step 3. Check rear servo for leaking oil seal rings and damaged piston. Repair rear servo (para. 28-16) if damaged. step 4. Check rear band apply pin for proper length. Replace pin (para. 26-7) if length is not correct step 5. Check rear band for damage and proper installation. Replace rear band (para. 28-7) if damaged. END OF TESTING! 29. NO DRIVE OR SUPS IN DRIVE step 1. If oil pressure in @ (overdrive) at 1,000 rpm is low, proceed to step 2. If oil pressure is , 8 , normal, proceed to step 4. Step 2. Perform steps 3,4, and 8 of malfunction 18. step 3. Check forward clutch for damage and burned clutch plates. Repair forward clutch (para. 28-11) if damaged. Step 4. Check roller clutch for damage and proper installation. Replace roller clutch (para. 28-13) if damaged END OF TESTING! 30. NO REVERSE OR SUPS IN REVERSE step 1. If oil pressure in @ (overdrive) at 1,000 rpm is low, proceed to step 2. If oil pressure is normal, proceed to step 4. step 2. Perform steps 4 and 6 through 9 of malfunction 18. step 3. Check control valve spacer plate for obstructions and misaligned gasket. Clean or replace spacer plate (chapter 28) if damaged. Step 4. Check control valve for damaged or leaking oil passages and stuck valves or incorrect assembly. Replace control valve (para. 28-17) if damaged. 14-13