TM 9-2320-361-20 MECHANICAL SYSTEMS TROUBLESHOOTING SYMPTOM INDEX MALFUNCTION NO. MALFUNCTION TROUBLESHOOTING PROCEDURE PAGE 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. ENGINE Engine will not crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28 Engine cranks but will not start . . . . . . . . . . . . . . . . . . . . . . . . . 2-28 Starter cranks engine slowly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 Engine stops during normal operation . . . . . . . . . . . . . . . . . . . . . . . . 2-29 Engine stops when accelerator is returned to idle position . . . . . . . . . . 2-30 Engine misfires during operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Poor acceleration and/or lack of power . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Engine surges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 Excessive engine oil loss or consumption during normal operation . . . . 2-31 Engine oil pressure too low or too high at normal operation temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 Excessive vibration or clunking . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 Excessive fuel consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 EXHAUST SYSTEM Exhaust color blue during normal operation . . . . . . . . . . . . . . . . . . . 2-32 Exhaust color white during normal operation and idle . . . . . . . . . . . . 2-32 Excessive exhaust noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 Exhaust fumes in cab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 MANIFOLD HEATER SYSTEM Engine cranks but will not start in cold weather (fuel system operating properly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 COOLING SYSTEM Engine temperature gage above 230°F (110°C). . . . . . . . . . . . . . . . . . 2-34 Engine does not reach normal operating temperature. . . . . . . . . . . . . 2-34 Coolant loss during normal operation . . . . . . . . . . . . . . . . . . . . . . . . 2-34 FUEL SYSTEM No fuel at fuel injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 PERSONNEL HOT WATER HEATER Personnel hot water heater does not heat cab . . . . . . . . . . . . . . . . . . 2-35 TRANSMISSION Transmission noisy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 Transmission leaks oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36 CLUTCH Clutch pedal will not travel or depress . . . . . . . . . . . . . . . . . . . . . . . 2-36 Vehicle creeps with clutch depressed. . . . . . . . . . . . . . . . . . . . . . . . . 2-36 Clutch drags, slips, or does not engage . . . . . . . . . . . . . . . . . . . . . . . 2-36 2-25