Section 4
MAINTENANCE
4-56
785 Motor Grader
TROUBLESHOOTNG CHARTS
ENGINE PROBLEMS (Continued)
SYMPTOM CAUSE REMEDY
Engine not Developing Full Power Wrong grade of fuel or water in fuel Drain water from fuel sump or drain
and refill with proper fuel.
Air filter elements clogged Clean or replace elements.
Fuel filter clogged Replace fuel filter.
Exhaust system restriction Check condition of muffler interior.
Incorrect valve clearance Adjust clearance.
Fuel line restriction Clear restriction with compressed air.
Fuel transfer pump malfunction Repair or replace pump. See your
authorized dealer.
Injection pump or nozzle malfunction Repair or replace. See your
authorized dealer.
Low Engine Oil Pressure Low oil level Check oil level. Fill to correct level.
(oil pressure indicator light On) Check for leaks and repair as
necessary.
Low viscosity using winter oil in Drain and fill with summer weight oil.
summer
Oil pressure sensor Replace sensor.
Clogged oil pump intake screen See your authorized dealer.
Engine Overheats Loose, worn, or broken fan belt Tighten or replace belt.
Low coolant level Fill to correct level and check
for leaks.
Radiator dirty or clogged Check airflow. Clean radiator.
Engine overloaded Reduce load. Operate in low gear.
Radiator cap not sealing Replace cap.
Faulty sender Replace sender.
Excessive brake drag Repair. See your authorized dealer.
Thermostat stuck or missing Replace thermostat.
Water pump leaking Repair or replace water pump.
Excessive Fuel Consumption Air system restricted Clean or replace filter elements.
Fuel system leakage Repair.
Incorrect grade of fuel Drain and fill with proper fuel.
Oil in Coolant or Coolant in Oil Leaking cylinder head gasket or Repair. See your authorized dealer.
cracked cylinder or block
Courtesy of Machine.Market
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