Engine Troubleshooting

Engine hard to start or will not start

Improper starting procedure.

Review starting procedure.

No fuel.

Check fuel tank.

Air in fuel tank.

Bleed fuel tank.

Cold weather.

Use cold weather starting procedure.

Slow starter speed.

See Starter Cranks Slowly in Electrical System Troubleshooting.

Crankcase oil too heavy.

Use oil of proper viscosity.

Improper type of fuel.

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

Water, dirt, or air in fuel system.

Drain, flush, fill and bleed system.

Clogged fuel filter.

Replace filter element.

Dirty or faulty injectors.

Have John Deere dealer check injectors.

Injection pump shutoff not reset.

Turn ignition switch to STOP, then to ON.

Fuel transfer pump not running (5625 only).

Check for plow fuse F6.

Defective fuel transfer pump (5625 only).

See your John Deere dealer.

Engine knocks

Insufficient oil.

Add oil.

Injection pump out of time.

See your John Deere dealer.

Low coolant temperature.

See your John Deere dealer.

OUO1023,000284B -19-14SEP06-1/5

Engine runs irregularly or stalls frequently

Low coolant temperature.

See your John Deere dealer.

Clogged fuel filter.

Replace filter element.

Water, dirt, or air in fuel system.

Drain, flush, fill, and bleed system.

Dirty or faulty injectors.

Have John Deere dealer check injectors.

Below normal engine temperature

Defective temperature gauge or sender.

Check gauge, sender, and conditions.

Lack of power

Engine overloaded.

Reduce load or shift to lower gear.

Low fast idle speed.

See your John Deere dealer.

Intake air restriction.

Service air cleaner.

Clogged fuel filter.

Replace filter element.

Improper type of fuel.

Use proper fuel.

Overheated engine.

Check coolant level, fan belt and debris in radiator fins.

Below normal engine temperature.

See your John Deere dealer.

Improper valve clearance (5425, 5525 and 5625).

See your John Deere dealer.

Dirty or faulty injectors.

Have John Deere dealer check injectors.

Injection pump out of time.

See your John Deere dealer.

Turbocharger not functioning.

See your John Deere dealer.

Leaking exhaust manifold gasket.

See your John Deere dealer.

Implement improperly adjusted.

See implement operator's manual.

Restricted fuel line.

See your John Deere dealer.

Restricted return line.

See your John Deere dealer.

Improper ballast.

Adjust ballast to load.

OUO1023,000284B -19-14SEP06-2/5

Low oil pressure

Low oil level.

Add oil.

Improper type of oil.

Drain; fill crankcase with oil of proper viscosity and quality.

High oil consumption

Crankcase oil too light.

Use proper viscosity oil.

Oil leaks.

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

Restricted crankcase vent tube.

Clean vent tube.

Defective turbocharger.

See your John Deere dealer.

Engine emits white smoke

Improper type fuel.

Use proper fuel.

Low engine temperature.

Warm up engine to normal operating temperature.

Defective injection nozzles.

See your John Deere dealer.

Engine out of time.

See your John Deere dealer.

Cold start advance or light load advance not functioning.

See your John Deere dealer.

Engine emits black or gray exhaust smoke

Improper type of fuel.

Use proper fuel.

Clogged or dirty air cleaner.

Service air cleaner.

Engine overloaded.

Reduce load or shift to a low gear.

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.

OUO1023,000284B -19-14SEP06-3/5

Engine overheats

Dirty radiator core or grille screen.

Remove all trash.

Low engine oil level.

Check oil level. Add oil as required.

Low coolant level.

Fill radiator to proper level. Check radiator, coolant recovery tank, and hoses for loose connection or leaks.

Faulty radiator cap.

Replace cap.

Loose or defective fan belt.

Check belt tension. Replace if necessary.

Cooling system needs flushing.

See your John Deere dealer.

Defective thermostat.

See your John Deere dealer.

Defective temperature gauge or sender.

See your John Deere dealer.

Incorrect grade of fuel.

Use proper fuel.

OUO1023,000284B -19-14SEP06-4/5

High fuel consumption

Improper type of fuel.

Use proper fuel.

Clogged or dirty air cleaner.

Service air cleaner.

Engine overloaded.

Reduce load or shift to a lower gear.

Fuel leakage.

Check fuel supply and return line for leaks. Check fuel tank for leaks and tighten clamps.

Improper valve clearance (5425, 5525 and 5625).

See your John Deere dealer.

Injection nozzles dirty.

See your John Deere dealer.

Engine out of time.

See your John Deere dealer.

Implement improperly adjusted.

See implement operator's manual.

Low engine temperature.

See your John Deere dealer.

Excessive ballast.

Adjust ballast to load.

Defective turbocharger.

See your John Deere dealer.

Restricted air intake system.

Check system.

Plugged crankcase vent tube.

Clean vent tube.

OUO1023,000284B -19-14SEP06-5/5