Engine

Engine Hard to Start or Will Not Start.

No fuel.

Fill tank with correct fuel and bleed system.

Clogged water filter.

Change filter.

Incorrect starting procedure.

Review starting procedure.

Water, dirt or air in fuel system.

Drain, flush, fill and bleed system.

Clogged fuel filter.

Replace filter and bleed air.

Incorrect type of fuel.

Consult fuel supplier; use correct fuel type for operating conditions.

Fuel pump disconnected.

Check wiring to fuel pump.

Dirty or faulty injectors.

See your John Deere dealer.

Slow starter speed.

See starter section.

Crankcase oil too heavy.

Use correct oil viscosity.

Hand primer left raised.

Push primer down.

Cold weather.

Use cold weather starting aids.

Engine Knocks

Low oil.

Add oil of correct viscosity.

Air in fuel system.

Bleed fuel system.

Injection pump out of time.

See your John Deere dealer.

Injection nozzle valve sticking.

See your John Deere dealer.

Internal engine problem.

See your John Deere dealer.

Low coolant temperature.

Remove and check thermostats.

Engine overheating.

See Engine Overheats.

AG,OUO1035,1639 -19-24JAN00-1/5

Engine Runs Irregularly or Stalls Often.

Low coolant temperature.

Remove and check thermostats.

Clogged water filter.

Change filter.

Clogged fuel filter.

Replace filter and bleed air.

Clogged fuel tank filter vent.

Clean filter vent.

Water, dirt or air in fuel system.

Drain, flush, fill and bleed system.

Dirty or faulty injectors.

See your John Deere dealer.

Injection pump out of time.

See your John Deere dealer.

Lack of Power

Engine overloaded.

Reduce load.

Overheated engine.

See Engine Overheats.

Below normal engine temperature.

Remove and check thermostats.

Intake air restriction.

Service air cleaner.

Clogged fuel filter.

Replace filter and bleed system.

Clogged water filter.

Replace filter.

Clogged fuel tank filter vent.

Clean filter vent.

Incorrect type of fuel.

Use correct fuel.

Turbocharger not functioning.

See your John Deere dealer.

Incorrect valve clearance.

See your John Deere dealer.

Dirty or faulty injectors.

See your John Deere dealer.

Injection pump out of time.

See your John Deere dealer.

Leaking exhaust manifold gasket.

See your John Deere dealer.

AG,OUO1035,1639 -19-24JAN00-2/5

Engine Overheats

Low coolant level.

Fill radiator with coolant to the correct level. Check hoses and radiator for leaks or loose connections.

Dirty cooling system radiator core or rotary cooling screen.

Clean radiator and rotary screen.

Rotary cooling screen not turning.

Broken drive belt.

Belt off sheaves.

Loose or broken fan belt.

Replace worn belt.

Cooling system needs flushing.

Drain and flush cooling system.

Defective thermostats.

Remove and check thermostats.

Vacuum duct plugged.

Clean duct.

Faulty radiator cap.

Have service man check.

Defective temperature gauge or sender.

See your John Deere dealer.

Low Oil Pressure

Low oil level.

Check crankcase oil level and add oil if needed.

Incorrect type of oil.

Drain, fill crankcase with correct quality and viscosity of oil.

Oil cooler plugged.

See your John Deere dealer.

High Oil Consumption

Restricted air intake system.

Check air cleaner and clean air intake.

Oil leaks.

Check for leaks in lines and around gaskets and drain plugs.

Too low viscosity crankcase oil.

Drain and fill crankcase with correct viscosity oil.

Restricted crankcase vent tube.

Clean vent tube.

Defective turbocharger.

See your John Deere dealer.

AG,OUO1035,1639 -19-24JAN00-3/5

High Fuel Consumption

Incorrect type of fuel.

Use correct fuel.

Clogged or dirty air cleaner.

Service air cleaner.

Incorrect valve clearance.

See your John Deere dealer.

Injection nozzles dirty.

See your John Deere dealer.

Engine out of time.

See your John Deere dealer.

Engine Blows Black or Gray Exhaust Smoke

Clogged or dirty air cleaner.

Check air cleaner for plugging. Filter element must be clean.

Wrong type of fuel.

Use correct type of fuel for operating conditions.

Dirty or defective injectors.

See your John Deere dealer.

Air in fuel system.

Bleed fuel system.

Defective muffler.

Check muffler for possible damage that might create back pressure.

Engine out of time.

See your John Deere dealer.

Engine Blows White Exhaust Smoke

Incorrect type of fuel.

Use correct fuel.

Clogged or dirty air cleaner.

Service air cleaner.

Injection nozzles dirty.

See your John Deere dealer.

Engine out of time.

See your John Deere dealer.

Turbocharger not functioning.

See your John Deere dealer.

Defective thermostat.

Remove and check thermostat.

Batteries Will Not Charge.

Loose or defective alternator belt.

Adjust belt or replace worn belt.

Loose or corroded connections.

Clean and tighten battery connections.

Alternator or voltage regulator not working right.

See your John Deere dealer.

AG,OUO1035,1639 -19-24JAN00-4/5

Starter Cranks Slowly or Will Not Operate.

Relay not working.

Check relay and wire connections.

Loose or corroded battery connections.

Clean and tighten loose connections.

Key switch worn or terminals loose.

Check switch and terminals.

Too high viscosity crankcase oil.

Drain and fill crankcase with correct viscosity oil.

AG,OUO1035,1639 -19-24JAN00-5/5