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4044, 4052, 4066 John Deere Diesel Engine

Starting the Engine with Hydrostatic Transmission

If attempting to restart the 4044M, 4044R, 4052M, 4052R, 4066M, 4066R John Deere tractors engine after a stall, wait at least 2 seconds before restarting.

Move the machine to an outside area before running the engine. Do not run an engine in an enclosed area without adequate ventilation. Connect a pipe extension to the engine exhaust pipe to direct the exhaust fumes out of the area. Allow fresh outside air into the work area to clear out the exhaust fumes.

It is recommended to install optional engine block heater, hydraulic oil heater, and battery heating pad if operating machine in temperatures below -18C (0F). If temperature is below 0C (32F), follow the cold weather starting steps in this section.

- Apply park brake.
- Move the transmission range shift lever to the N (neutral) position.
- Make sure PTO switch is in the off position.
- Remove foot from forward and reverse travel pedals.
- Check to be sure that area is clear of any bystanders before lowering implements to the ground. Lower any rear-mounted implement to the ground by pushing the rockshaft control lever forward.
- Lower any front-mounted implement to the ground using the SCV lever (if equipped).
- Set hand throttle to the 1/2-3/4 fast position.
- Turn key switch to the run position.
- Check instrument panel indicator lights: Alternator/battery charging light illuminates. Engine oil pressure light illuminates. Glow plugs and air heater are operational during cranking. Using ether or starter fluid during cranking will cause damage to engine.
- Turn key switch to the start position to start engine. Release the key after the 4044, 4052, 4066 John Deere tractors engine has started.
- Check indicator lights: Engine oil pressure light goes out within 5 seconds. If indicator light does not go out after 10 seconds, set engine speed at full throttle. Alternator charging light should go out within 10 seconds. If indicator lights stay on longer than the given time interval, stop engine and check for cause.
- Set hand throttle to the 1/2 fast position for 1 minute without load.

Cold Weather Starting

- Apply park brake.
- Move the JD tractor transmission range shift lever to the N (neutral) position.
- Turn key switch to the run position.
- When glow plug icon light turns off, turn key to the start position. Starter may be damaged if starter is operated for more than 20 seconds at a time. Wait 2 minutes before trying again if engine does not start.
- Release key when engine starts.
- Check instrument panel indicator lights: Engine oil pressure light will go out within 5 seconds. Alternator/battery charging light will go out within 10 seconds.
- If indicator light remains on after 10 seconds, set engine speed to full throttle. If indicator light continues to stay on, stop the engine and check for cause.
- Warm the engine: In warm weather, set hand throttle to the 1/2 fast position for 1 minute without load. In cold weather, set hand throttle to the 1/2 fast position for 5 minutes without load.

Idling Engine

Allowing engine to idle for long periods of time wastes fuel and cause carbon buildup.

- Adjust hand throttle to set engine at low idle.
- Apply park brake.

Starting a Stalled JD 4044M, 4044R, 4052M, 4052R, 4066M, 4066R Engine

- Disengage PTO.
- Remove foot from forward and reverse travel pedals.
- Move transmission range shift lever to the N (neutral) position.
- Start engine. Continue with normal operation, or set engine at low idle for 2 minutes before stopping engine.

Starting the Engine with PowrReverser Transmission

If attempting to restart the JD 4044, 4052, 4066 tractors engine after a stall, wait at least 2 seconds before restarting.

A - Park Brake, B - Clutch Pedal, C - Transmission Gear Shift Lever, D - Reverser Lever, E - PTO Switch, F - Rockshaft Control Lever, G - SCV Lever, H - Hand Throttle

- Apply park brake (A).
- Depress clutch pedal (B) completely and move the John Deere tractor transmission gear shift lever (C) and reverser lever (D) to the N (neutral) position.
- Make sure PTO switch (E) is in the off position.
- Lower any rear-mounted implement to the ground by pushing the rockshaft control lever (F) forward.
- Lower any front-mounted implement to the ground using the SCV lever (G).
- Set hand throttle (H) to the 1/2—3/4 fast position.
- Turn key switch to the run position.
- Check instrument panel indicator lights: Alternator/battery charging light illuminates. Engine oil pressure light illuminates.
- Turn key switch to the start position to start engine. Release the key after the engine has started.
- Check indicator lights: Engine oil pressure light goes out within 5 seconds. If indicator lights stay on longer than the given time interval, stop engine and check for cause.
- Set hand throttle to the 1/2 fast position for 1 minute without load.

Cold Weather Starting

- Apply park brake.
- Depress clutch pedal and move the 4044M, 4044R, 4052M, 4052R, 4066M, 4066R John Deere transmission gear shift lever and reverser lever to the N (neutral) position.
- Turn key switch to the run position.
- When glow plug icon light turns off, turn key to the start position. Starter damage can occur if starter is operated for more than 20 seconds at a time. Wait 2 minutes before trying again if engine does not start.
- Release key when engine starts.
- Check instrument panel indicator lights: Engine oil pressure light goes out within 5 seconds. Alternator/battery charging light goes out within 10 seconds.
- If indicator light remains on after 10 seconds, set engine speed to full throttle. If indicator light continues to stay on, stop the engine and check for cause.
- Warm the engine.

Idling Engine

- Adjust hand throttle to set engine at low idle.
- Apply park brake.

Starting a Stalled Engine

If JD tractor engine stalls while operating under load, start engine immediately to prevent abnormal heat buildup in engine.

- Disengage PTO.
- Apply park brake.
- Depress clutch pedal and move transmission gear shift lever and reverser lever to the neutral position.
- Start engine.
- Release park brake and continue with normal operation, or set engine at low idle for 2 minutes before stopping engine.

JD 4044, 4052, 4066 Service Electrical

Battery Removal (Open Operator Station)

B - Grille, C - Black Negative Cable, D - Red Positive Terminal Cover, E - Red Positive Cable, F - Cap Screw (2 used), G - Vent Tube

- Raise hood.
- Remove side panels.
- Release grille latches and unhook from grille frame.
- Disconnect headlight wiring harness.
- Raise grille (B), rotate rearward, and lower slightly into slide track detents.
- Disconnect black negative (-) cable (C) from battery terminal first.
- Slide red positive terminal cover (D) back and disconnect red positive (+) cable (E) from battery terminal.
- Remove cap screw (F) from each side of the battery hold-down bracket.
- Pull battery vent tube (G) from battery tray.
- Remove battery.

Battery Installation (Open Operator Station)

- Position battery in machine.
- Route battery vent tube (G) through hole in battery tray.
- Install hold-down bracket and install cap screws (F) securing battery to battery tray.
- Connect red positive (+) cable (E) to battery first, then attach black negative (-) cable (C) to battery.
- Apply spray lubricant on battery terminals to help prevent corrosion.
- Position red positive terminal cover (D) on red positive (+) cable.
- Lower grille (B) and attach grille latches.
- Connect headlight wiring harness.
- Install side panels.
- Lower hood.

Battery Removal (Cab)

- Park John Deere tractor safely.
- Locate battery box on the right side of JD tractor.
- Loosen thumb screws on both sides of the battery box.
- Slide battery box cover off.
- Slightly lift battery tray and pull out.
- Disconnect negative (-) battery cable.
- Push red cover back away from positive (+) battery cable and remove cable from battery.
- Lift vent tube from vent tube hole.
- Remove battery hold-down nut and remove battery hold-down rod.
- Remove battery.

Battery Installation (Cab)

- Position battery in battery tray.
- Apply spray lubricant to terminals to prevent corrosion.
- Connect positive (+) cable to battery positive (+) terminal first, then negative (-) cable to battery negative (-) terminal.
- Slide red cover over positive battery cable.
- Support battery tray and slide back into position slightly lifting.
- Install battery hold-down nut and battery hold-down rod.
- Slide vent tube into vent tube hole.
- Slide battery cover on and tighten thumb screws.

Cleaning Battery and Terminals

- Park machine safely.
- Disconnect and remove 4044M, 4044R, 4052M, 4052R, 4066M, 4066R John Deere tractors battery.
- Wash battery with solution of four tablespoons of baking soda to one gallon of water. Be careful not to get the soda solution into the cells.
- Rinse the battery with plain water and dry.
- Clean terminals and battery cable ends with wire brush until bright.
- Install battery.
- Attach cables to battery terminals, beginning with the positive cable, using washers and nuts.
- Apply spray lubricant to terminal to prevent corrosion.

Replacing Light Bulbs (Open Station)

Replacing 4M Tail/Turn Light Bulb

- Remove two screws and red lens.
- Push down and rotate bulb to remove. Do not twist bulb.
- Push down and rotate new bulb into socket.
- Check operation of tail lights and turn signals.
- Install lens and screws.

Replacing Warning Light Bulb

- Remove two screws and amber lens.
- Push up and rotate bulb to remove. Do not twist bulb.
- Push up and rotate new bulb into socket.
- Check operation of turn signals and warning lights.

Replacing 4R Tail/Turn and Warning Light Bulb

Tail lights and warning lights can be serviced by removing the rear assembly lens only.

- Park machine safely.
- Remove four screws, red lens, and amber lens.
- Push down and rotate tail light and turn signal bulb to remove. Push down and rotate warning light bulb to remove. Do not twist bulb.
- Push down and rotate new bulb into socket.
- Check operation of tail lights, turn signals, and warning lights.
- Install lenses and screws.