58. LONG 1-2 SHIFT WITH END BUMP, 1-2 SLIPPAGE, OR EARLY 1-2 SHIFT

59. LONG 2-3 SHIFT WITH END BUMP, 2-3 SLIPPAGE, OR EARLY 2-3 SHIFT

/.25ton/TM-9-2320-289-34 CUCV Series Trucks at intermediate direct support and general support level Manual
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TM 9-2320-289-34 Table 2-1, Mechanical Troubleshooting (Con’t) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 4. Disconnect vacuum hose from vacuum pump. Install hose and vacuum gage on vacuum pump. Start engine. Calculate proper vacuum gage reading as shown in chart. Shut off engine. If vacuum drops 1 in. Hg or more in less than 1.5 seconds, or if vacuum never reaches proper gage reading, replace vacuum pump. (See TM 9-2320-289-20) Step 5. Step 6. Step 7. Step 8. Remove, clean, and inspect vacuum modulator assembly and modulator valve. (See paragraph 5-3) Remove and air check direct clutch for leak to outer area of direct clutch (See paragraph 5-1 7) Repair direct clutch if it is leaking. Remove, disassemble, clean, and inspect transmission oil pump. piston. (See paragraph 5-1 5) Check for damage to intermediate clutch piston seals, second oil seal ring on center support, and center support assembly. Replace any damaged components. (See paragraph 5-1 9) 58. LONG 1-2 SHIFT WITH END BUMP, 1-2 SLIPPAGE, OR EARLY 1-2 SHIFT Step 1. Test transmission oil pressure with brakes applied, “ D“ (Drive), engine at 1000 rpm. (See paragraph 5-11) If oil pressure is normal, perform step 2. If oil pressure is low, perform step 3. 2-35

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