29. Engine Knocks or Develops Excessive Noise
Probable cause
Possible remedy
Rocker arm clearance incorrect............. Adjust rocker arms (par. 101).
Worn main or connecting rod ................ Replace as necessary. Report this condition to field maintenance, 3d echelon.
Broken piston or ring, loose or
Injection pump timing incorrect.............. Time fuel pump. Report this condition to field maintenance, 3d echelon.
30. Engine Has Low or No Oil Pressure
Probable cause
Possible remedy
Oil pressure gage defective................... Replace gage (par. 87).
Oil pressure gage line clogged .............. Clean or replace oil line (par. 87).
or broken.
Dirt in oil cooler bypass valve................ Clean valve and replace spring if necessary (par. 72).
or broken spring.
Oil too light or diluted ............................ Drain and replace with recommended grade lubricant. Refer to LO 5-3820-205-
20/2.
Probable cause
Possible remedy
Engine temperature low ........................ Replace thermostat (par. 106).
Fuel injectors defective ......................... Replace fuel injectors (par. 65).
Poor grade diesel fuel ........................... Drain fuel system and replace with proper grade fuel.
Worn or stuck rings, or worn.................. Replace as necessary. Report to field maintenance, 3d echelon.
valve guides and seals.
Restriction in air supply ......................... Check and clean air cleaner (TM 5-3820-205-10/2).
32. High Oil Consumption
Probable cause
Possible remedy
Oil leaks. .............................................. Locate and repair leaks (par. 87).
Too high oil level maintained................. Check oil level and fill to indicated full mark on bayonet gage.
Incorrect grade of oil ............................. Refer to current lubrication order and fill with proper grade of oil.
Oil pressure too high (relief ................... Clean and free oil cooler bypass relief valve spring(par. 72).
valve stuck).
Worn, broken, or stuck rings.................. Replace as necessary.
Worth bearings or valve guides............. Report to field maintenance, 3d echelon.
33. Batteries Fail to Maintain Charge
Probable cause
Possible remedy
Electrolyte below proper level. .............. Replace electrolyte to proper level with distilled water (par. 80).
Generator brushes worn ........................ Replace generator brushes (par. 91). Test and replace generator (par. 84).
Generator regulator defective................ Test and replace generator regulator (par. 83).
Connections in wiring shorted or loose .. Check all wiring for shorts or loose connections (pars. 83 and 84).
34. Power Takeoff Clutch Slips or Grabs
Probable cause
Possible remedy
Clutch out of adjustment ....................... Adjust clutch (TM 5-3820-205-10/2).
Worn clutch plate lining, broken ............ Replace as necessary. Report this condition to field maintenance, 3d echelon.
throwout yoke or springs, oil
soaked lining. Warped clutch
plates.
35. Discharge Conveyor Inoperative
Probable cause
Possible remedy
Conveyor electric motor belts................ Replace worn or broken belts (par. 129).
worn or broken.
Drive sheave on conveyor motor........... Replace defective sheave (par. 159).
or gear reducer defective.
Defective gear reducer.......................... Replace defective gear reducer (par. 159).
Electric motor starting switch................. Replace electric motor starting switch (par. 130).
defective or defective wiring.
36. Grooves or Cuts Appearing in Conveyor Belt
Probable cause
Possible remedy
Discharge conveyor hopper................... Replace or repair hopper.
hitting belt.
Report to field maintenance, 3d echelon.
Rocks wedged between side or back ..... Remove rocks.
of discharge conveyor and belt.
Rock or gravel sticking to head belt....... Clean out rock or gravel.
scraper and return idler rollers.
Roller on idler not turning. ..................... Check idlers for tight rollers and adjust or loosen.
Sand imbedded in rubber rear ............... Clean off sand.
flashing on discharge conveyor.
Sideboards of discharge........................ Straighten out bent portion.
conveyor bent down.
AGO 8156A
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