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4044, 4052, 4066 John Deere Tractors Troubleshooting

4044M, 4044R, 4052M, 4052R, 4066M, 4066R John Deere Engine Troubleshooting

Engine Will Not Start or Is Hard to Start	PTO engaged.
	Engine throttle lever not pushed forward.
	Fuel shutoff valve CLOSED (OFF).
	Stale fuel, improper fuel, or fuel level.
	Wrong engine oil viscosity.
	Cold start system not being used, or malfunctioning.
	Plugged fuel filter.
	Plugged air intake filter.
	Dirty or faulty fuel injectors.
	Blown fuse.
	Other electrical problem.

Engine Will Not Start After a Stall

Wait at least 2 seconds and then retry.

Engine Runs Rough or Stalls	Fuel shutoff valve partially closed.
	Plugged fuel filter.
	Plugged air intake system.
	Fuel cap vent dirty.
	Faulty seat switch.
	Stale fuel, improper fuel, or fuel level.
	Dirty or faulty fuel injectors.
	Low coolant temperature.
	Fuel pump not functioning properly.

Engine Overheats	Dirty grille, radiator screen, or radiator cooling fins.
	Plugged air intake filter.
	Low coolant level.
	Cooling system needs flushing.
	Defective radiator cap.
	Defective thermostat.
	Defective water temperature indicator or sender.
	Low oil level.
	Loose or defective alternator belt.
	Engine speed too low for load. Do not operate at low idle.
	Operating at too fast ground speed for conditions.

Engine Knocks	Engine oil level low.
	Injection pump out of time.
	Low coolant temperature.
	Engine overheating.
	Idle speed too low.

Engine Lacks Power	Exhaust filter restriction.
	Improper type of fuel.
	Plugged air intake system.
	Plugged fuel filter.
	Engine overheating. Operating at too fast ground speed for conditions.
	Engine oil viscosity too high.
	Low coolant temperature.
	Improper valve clearance.
	Dirty or faulty fuel injectors.
	Injection pump out of time.
	Implement improperly adjusted, causing drag on machine.
	Rate-of-drop valve closed, causing hydraulic load on engine.

Low Oil Pressure	Engine oil level low.
	Plugged oil filter.
	Improper type of oil.
	Oil leaks.

Engine Uses Too Much Oil	Find and correct oil leaks.
	Incorrect engine oil.
	Plugged air intake filter.

Engine Emits White Smoke	Improper type of fuel.
	Low engine temperature.
	Defective thermostat.
	Engine out of time.

Engine Emits Black or Gray Exhaust Smoke	Improper type of fuel.
	Plugged air intake system.
	Operating at too fast ground speed for conditions.
	Dirty or faulty fuel injectors.
	Engine out of time.

High Fuel Consumption	Improper type of fuel.
	Plugged air intake system.
	Operating at too fast ground speed for conditions.
	Improper valve clearance.
	Dirty or faulty fuel injectors.
	Engine out of time.
	Implement improperly adjusted, causing drag on machine.
	Low engine temperature.
	Restricted air intake system.
	Plugged crankcase vent tube or baffle.
	Brakes dragging.

Electrical System Troubleshooting

Battery Will Not Charge	Check to ensure 2-pin connector on alternator is plugged in properly.
	Loose or corroded connections.
	Check for a blown fuse.
	Loose or defective alternator belt.
	Dead cell in battery.
	Defective battery—check electrolyte level (if applicable).
	Defective alternator.

Battery Discharge Indicator Stays On With Engine Running	Low engine speed.
	Check to ensure 2-pin connector on alternator is plugged in properly.
	Check for a blown fuse.
	Loose or defective alternator belt.
	Defective battery.
	Defective alternator.

Starter Will Not Work	Loose or corroded battery connections.
	Blown fuse.
	Low battery output—check electrolyte level (if applicable).
	Key switch or starter faulty.
	PTO engaged.
	Check for active fault codes.

Starter Turns Slowly	Low battery output—check electrolyte level (if applicable).
	Low battery power—charge battery.
	Engine oil viscosity too heavy.
	Loose or corroded battery connections.

Light Circuit Not Working

Fuse blown.

Cruise Control Does Not Engage or Shuts Off

Adjust service brake switch.

Heater and Air Conditioning System Troubleshooting

All Cab Electrical Switches Do Not Work

Loose, defective or blown fusible link.

Blower Malfunctioning	Blown fuses.
	Blower does not work.

Blower Operates Only in High Position	One of two fuses blown.
	Blown blower resistance assembly.

Heater Does Not Work	Low coolant level. Check coolant level; add if necessary.
	Faulty thermostat.
	Heater control valve not functioning properly.
	Heater core or hoses clogged or damaged. Flush cooling system.
	Replace heater core or hoses.

Air Conditioning Does Not Work	Blown fuse.
	Faulty wiring or loose connections.
	Fan belt loose or slipping.
	Defective switch.
	Defective compressor clutch.

Drafts	Poor air distribution. Adjust directional air louvers.
	Set blower switch to medium or low position.

Inadequate Air Flow	Clogged air filters.
	Evaporator core air flow restricted.
	Faulty blower fan motors.
	Defective blower switch.
	Faulty wiring or loose connections.

Water Leaking or Dripping from Evaporator Core Compartment	Loose hose clamp.
	Evaporator condenser pan dirty.
	A/C drain tubes plugged.

Strange Odors Inside Operator’S Cab	Dirty air filters.
	Evaporator condenser pan dirty.
	A/C drain tubes plugged.
	Tobacco smoke and tar on evaporator exterior.

Partial Frosting and Sweating of Lines Combined with Poor Cooling	Fan belt slipping.
	Loss of refrigerant.
	Restricted or clogged liquid line.
	Expansion valve malfunctioning.

Ice Flecks Blowing from Evaporator

Control dial set too low. Adjust temperature control to a warmer position.

Failure to Cool	Insufficient blower speed.
	Dirty air filters.
	Debris on front grille.
	Lint or dirt on condenser fins.
	Refrigerant is lost or extremely low.
	Loose fan belt.
	Compressor clutch not engaging.
	Expansion valve not functioning.
	Restriction in refrigerant system.
	Faulty wiring or loose connections.
	Defective temperature control switch.
	Outside temperature too low, below 21C (70F). Wait until day gets warmer.
	Condenser is overheating. Clean condenser screens, cores and fins of condenser and radiator.
	Severe restriction in high side.
	Burned out clutch field or faulty field.
	Short circuit in control circuit or failure of a switch in circuit.

Hissing Noise at Expansion Valve	Loss of refrigerant.
	Restriction in refrigerant system.
	Check receiver-dryer for uniformity of temperature.

4044, 4052, 4066 John Deere Machine Troubleshooting

Operation Sluggish, Slow

Suction side filter may need replacement.

Poor Hydraulic Performance	Suction side filter may need replacement.
	Water in oil.

Excessive Machine Vibration

Engine speed too slow.

Machine Will Not Move with Engine Running	Electrical problems.
	Park brake locked.
	Transmission oil level low.
	Transmission oil cold - allow engine to warm.
	Transmission range shift lever in neutral position.
	Suction side filter may need replacement.
	Operator not in seat.

3-point Hitch Fails to Lift	Low oil level.
	Worn hydraulic pump.
	Rate-of-drop valve closed.
	Excessive load on hitch.
	Hydraulic oil too cold.
	Hydraulic oil suction filter plugged.

3-point Hitch Lifts Slowly	Suction side filter may need replacement.
	Worn hydraulic pump.

3-point Hitch Drops Slowly or Does Not Drop	Rate-of-drop valve closed.
	Rate-of-drop valve set too slowly.

3-point Hitch Drops Too Fast	Rate-of-drop valve set too fast.
	Load too heavy.

Noise Is Coming from PTO During Operation

Noise may occur at low engine speeds, increase to rated engine speed.

Hitch Assist Disengages When Exiting the Tractor

Park brake is not fully engaged.

4044M, 4044R, 4052M, 4052R, 4066M, 4066R Steering Troubleshooting

Steering Not Working	Suction side filter may need replacement.
	Improper tire inflation.
	Low oil level.
	Excessive play in steering. See your John Deere Dealer.
	Worn hydraulic pump.

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