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TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download

Page 508 of 890

TM 9-2320-280-20-1 REFERENCE INFORMATION Change 1 2-403 TRANSMISSION SYSTEM (3L80) NOTE NEXT TEST MUST BE PERFORMED DURING A ROAD TEST OR WITH VEHICLE RAISED AND TIRES OFF THE GROUND. RECORD PRESSURE WITH THROTTLE CLOSED. 12. Place lever in D and take foot off brake. With engine at 2000 RPM, close throttle and read pressure between 1200 and 2000 RPM. Pressure should be 65-70 psi (448-485 kPa). If not, notify DS Maintenance. 13. Shut off engine, remove transducer and reinstall plug. STE/ICE-R TEST #50 0 TO 1000 PSIG PRESSURE INTERLEAVED WITH RPM 1. Connect blue pressure transducer (1000 PSI) to system under test, and other end to a W4 cable. Make sure the system under test is not pressurized. 2. Dial 01 into VTM, and then 50 when prompted. 3. Perform offset test. 4. Start engine and VTM will display pressure interleaved with RPM. 1. Remove plug from pressure port on left side of transmission. 2. Connect transducer to port using appropriate fittings. 3. Perform offset test. 4. Start engine and check for leaks at connections. 5. Bring engine to operating temperature. 6. Place shift lever in N and bring engine to 1000 RPM (STE/ICE-R test 10). Pressure should be 55-70 psi (379-483 kPa). If not notify DS Maintenance. 7. Apply service brakes and place shifter in D. Operate engine at 1000 RPM. Pressure should be 60-90 psi (414-621 kPa). If not, notify DS Maintenance. 8. Apply brakes and place lever in 2. With engine at 1000 RPM, pressure should be 135-160 psi (931- 1103 kPa). If not, notify DS Maintenance. 9. Apply brakes and place lever in 1. With engine at 1000 RPM, pressure should be 135-160 psi (931-1103 kPa). If not, notify DS Maintenance. 10. Apply brakes and place lever in R. With engine at 1000 RPM, pressure should be 95-150 psi (655-1034 kPa). If not, notify DS Maintenance. 11. Apply brakes and place lever in D. With engine idling, pressure should be 60-85 psi (414-586 kPa). If not, notify DS Maintenance. Transmission oil pressure test Replace transmission modulator, refer to (para. 5-14).