OMCXT20713

Engine

NOTE: Before troubleshooting the engine, first retrieve all fault codes on the armrest display and relay them to your John Deere dealer. If any problems remain, use the following information to solve engine problems.

Symptom	Problem	Solution
Engine Will Not Crank	Weak battery.	Replace battery.
	Corroded or loose battery connections.	Clean battery terminals and connections.
	Defective main switch or start safety switch.	Repair switch as required.
	Starter solenoid defective.	Replace solenoid.
	Starter defective.	Replace starter.

Hard to Start or Will Not Start	Poor fuel quality.	Drain fuel and replace with quality fuel of the proper grade.
	Slow cranking speed.	Check for problem in the charging/starting system.
	Too high viscosity crankcase oil.	Drain crankcase oil and replace with correct viscosity oil.
	Electronic Control Unit problem.	See your John Deere dealer.

Engine Misfiring or Runs Irregularly

Electronic Control Unit problem or basic engine problem.

See your John Deere dealer.

Lack of Engine Power	Poor fuel quality.	Drain fuel and replace with quality fuel of the proper grade.
	Plugged fuel filter.	Replace fuel filters.
	Engine overloaded.	Reduce engine load.
	Improper crankcase oil.	Drain crankcase oil and replace with correct viscosity oil.
	Electronic Control Unit problem or basic engine problem.	See your John Deere dealer.

Engine Emits Black or Gray Exhaust Smoke	Improper type of fuel.	Drain fuel and replace with quality fuel of the proper grade.
	Engine overloaded.	Reduce engine load.
	Fuel injectors dirty.	See your John Deere dealer.
	High pressure fuel pump out of time.	See your John Deere dealer.
	Turbocharger not functioning.	See your John Deere dealer.
	Engine burning oil.	See Lubrication System troubleshooting later in this section.
	Air cleaner restricted or dirty.	Replace air cleaner element as required.
	Defective muffler/exhaust piping (causing back-pressure).	Replace muffler or defective piping.
	Electronic Control Unit problem or basic engine problem.	See your John Deere dealer.

Engine Emits White Exhaust Smoke	Improper type of fuel.	Drain fuel and replace with quality fuel of the proper grade.
	Low engine temperature.	Warm up engine to normal operating temperature.
	Defective thermostat.	See your John Deere dealer.
	Defective fuel injectors.	See your John Deere dealer.
	High pressure fuel pump out of time.	See your John Deere dealer.
	Engine compression too low.	See your John Deere dealer.
	Coolant entering combustion chamber (failed cylinder head gasket or cracked cylinder head).	See your John Deere dealer.
	Electronic Control Unit problem or basic engine problem.	See your John Deere dealer.

Engine Idles Poorly	Poor fuel quality.	Drain fuel and replace with quality fuel of the proper grade.
	Air leak on suction side of air intake system.	Check hose and pipe connections for tightness; repair as required.
	Electronic Control Unit problem or basic engine problem.	See your John Deere dealer.

Excessive Fuel Consumption	Engine overloaded.	Reduce engine load.
	Air cleaner restricted or dirty.	Replace air cleaner element as required.
	Compression too low.	See your John Deere dealer.
	Leaks in fuel supply system.	Locate source of leak and repair as required.
	Improper type or poor quality of fuel.	Drain fuel and replace with quality fuel of the proper grade.
	Improper valve clearance.	See your John Deere dealer.
	Fuel injectors defective.	See your John Deere dealer.
	High pressure fuel pump out of time.	See your John Deere dealer.
	Improper turbocharger operation.	Inspect turbocharger. See your John Deere dealer.

Fuel in Oil

Cracked cylinder head.

See your John Deere dealer.

Low-Pressure System - Fuel Pressure Low	Plugged fuel filter.	Replace fuel filter.
	Restricted fuel line.	Locate restriction, repair as required.
	Faulty high-pressure fuel pump.	See your John Deere dealer.

Abnormal Engine Noise NOTE: Variable geometry turbocharger recycles after starting engine, causing a momentary revving sound in the engine. This is normal. Do not confuse the whine heard during turbocharger run down with noise which indicates a bearing failure. The whine heard during turbocharger run down is normal.	Worn main or connecting rod bearings.	See your John Deere dealer.
	Excessive crankshaft end play.	See your John Deere dealer.
	Loose main bearing caps.	Check bearing clearance; replace bearings and bearing cap screws as required. See your John Deere engine distributor or servicing dealer.
	Worn connecting rod bushings and piston pins.	See your John Deere dealer.
	Scored pistons.	See your John Deere dealer.
	Worn timing gears or excess backlash.	See your John Deere dealer.
	Excessive valve clearance.	See your John Deere dealer.
	Worn camshaft lobes.	See your John Deere dealer.
	Worn rocker arm shaft(s).	See your John Deere dealer.
	Insufficient engine lubrication.	See Lubrication System troubleshooting later in this section.
	Turbocharger noise.	See Air Intake troubleshooting later in this section.

Engine Overheats	Engine overloaded.	Reduce engine load.
	Low coolant level.	Fill radiator to proper level; check radiator and hoses for loose connections or leaks.
	Faulty radiator cap.	Replace radiator cap.
	Stretched belt or defective belt tensioner.	Check automatic belt tensioner; check belts for stretching. Replace as required.
	Low engine oil level.	Check oil level. Add oil as required.
	Cooling system needs flushing.	Flush cooling system.
	Defective or wrong type of thermostats.	See your John Deere dealer.
	Defective temperature gauge or sender.	Check coolant temperature with thermometer and replace, if necessary.
	Improper type or poor quality of fuel.	Drain fuel and replace with quality fuel of the proper grade.

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