Section IV. TROUBLESHOOTING
21. General
This section provides information useful in diagnosing and correcting unsatisfactory operation or failure of the jaw crusher
and its components. Each trouble symptom stated is followed by a list of probable causes of the trouble. The possible
remedy recommended is described opposite the probable cause. Any trouble beyond the scope of organizational
maintenance shall be reported to field maintenance, 3d echelon.
22. Starter Fails to Crank Engine
Probable cause
Possible remedy
Starter switch defective ......................... Replace starter switch (par. 92).
Poor electrical connection ..................... Clean and tighten battery cables and other electrical connections (par. 80).
Battery discharged ................................ Replace batteries (par. 80).
Starter brushes worn ............................. Replace starter brushes (par. 86).
Starter solenoid defective...................... Replace starter solenoid (par. 85).
23. Engine Hard to Start or Fails to Start
Probable cause
Possible remedy
Battery charge low ............................... Recharge or replace batteries (par. 80).
Fuel lines clogged ................................ Clean fuel lines (par. 69).
Fuel injection pump defective................ Replace fuel pump. Report this condition to field maintenance, 3d echelon.
Fuel injectors dirty................................. Replace fuel injectors (par. 65).
Rocker arm clearance incorrect............. Adjust the rocker arms (par. 101).
Injection pump timing incorrect.............. Time injection pump. Report this condition to field maintenance, 3d echelon.
Starter defective.................................... Replace starter (par. 86).
Defective air cleaner ............................. Repair air cleaner (par. 63).
Fuel tank valve closed .......................... Open fuel tank valve.
24. Engine Misses or Runs Erratically
Probable cause
Possible remedy
Rocker arm clearance incorrect............. Adjust rocker arms (par. 101).
Fuel injectors defective. ........................ Replace fuel injectors (par. 65).
Fuel pump defective.. ........................... Replace fuel pump. Report this condition to field maintenance, 3d echelon.
25. Engine Stops Suddenly
Probable cause
Possible remedy
Fuel pump defective. ............................ Replace fuel pump. Report this condition to field maintenance 3d echelon.
Engine temperature too high
Remove and test thermostats (par. 107). Replace defective thermostats (par.
(safety device operated).
107).
Oil pressure low (safety......................... Inspect for and repair leaks in oil lines (par. 75).
switch operated).
Engine safety switch defective. ............. Replace engine safety switch (par. 91).
Overspeed governor defective. ............. Replace overspeed governor(par. 90).
26. Engine Overheats
Probable cause
Possible remedy
Thermostat defective ............................ Replace thermostats (par. 107).
Fan belts worn and................................ Replace fan belts (par. 104).
slipping on pulley.
Injection pump timing incorrect.............. Time injection pump. Report to field maintenance, 3d echelon.
Back pressure in exhaust system. ......... Inspect for restrictions in muffler and exhaust system (par. 77).
Defective water pump ........................... Replace water pump (par.105).
27. Engine Lacks Power
Probable cause
Possible remedy
Fuel injector defective........................... Replace fuel injectors (par. 65).
Fuel injection pump defective................ Replace injection pump. Report this condition to field maintenance, 3d echelon.
Restricted fuel supply or ....................... Remove fuel line and clean(par. 69). Bleed fuel system (TM 5-3820-205-10/2).
air in system.
28. Engine Will Not Idle Smoothly
Probable cause
Possible remedy
Rocker arm clearance incorrect............. Adjust rocker arms (par. 101).
Engine operating temperature low. ........ Replace defective thermostat (par. 107).
Defective fuel injectors ......................... Replace fuel injectors (par. 65).
Fuel pump defective ............................. Replace fuel pump. Report this condition to field maintenance, 3d echelon.
AGO 8156A
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