Specifications, Service and Repair of Farm and Lawn Tractors

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

Checking Engine Oil Level

Failure to check the oil level regularly could lead to 4044, 4052, 4066 John Deere Tractors engine problems if oil level is low:

- Check oil level before operating.
- Check oil level when the engine is cold and not running.
- Keep level between the Full and the Add marks.
- Shut off engine before adding oil.

Check engine oil when engine is cold. If engine is warm, allow to cool for at least 5 minutes before checking oil. Check engine oil with machine parked on a level surface.

- Park machine safely.
- Remove dipstick, located at the right side of the engine. Wipe with a clean cloth.
- Install dipstick.
- Remove dipstick.
- Check oil level on dipstick. Oil level should be between levels (Full and Add) on dipstick.
- If oil level is low: Raise hood. Remove right side panel. Remove oil fill cap. Add recommended engine oil until level is within operating range on dipstick. Do not overfill. Install dipstick.
- If oil is above full level on dipstick, drain to proper level.
- Install right side panel.
- Lower hood.

Changing JD Tractors Engine Oil and Filter

- Run engine to warm the oil.
- Park machine safely.
- Remove right side panel.
- Place drain pan under oil drain plug, located on underside of engine.
- Remove drain plug.
- Wipe dirt from around oil filter.
- Turn filter counterclockwise to remove.
- Put a light coat of clean engine oil on gasket of new filter.
- Install replacement oil filter by turning filter clockwise until gasket contacts filter base. Tighten additional 1/2 turn.
- Install drain plug. Do not overtighten.
- Remove oil fill cap.
- Add approximately 4.5 L (1.2 gal.) engine oil.
- Install oil fill cap.
- Start and run engine at idle to check for leaks.
- Stop engine. Fix any leaks before operating.
- Check engine oil level. Add oil if necessary.
- Install right side panel.

Servicing Air Filter Elements

Dirt and debris can enter the JD 4044M, 4044R, 4052M, 4052R, 4066M, 4066R Tractors engine through a damaged filter element: All air filter assemblies are similar.

Servicing Primary Air Filter Element

- Park machine safely.
- Allow engine to cool.
- Raise hood.
- Remove hold-down strap.
- Tilt canister up, release latches, and remove air filter canister cover.
- Remove and discard primary filter element. Clean out any dirt in canister, taking care not to damage secondary filter element. Replace with a new primary filter element.
- Install air filter canister cover with rubber dust unloading valve pointing downward.
- Secure latches.
- Position canister back in place and install hold-down strap.
- Check instructions molded into canister cover for proper installation.
- Lower hood.

Servicing Secondary Air Filter Element

Secondary filter element does not need routine replacement. Visually inspect it without removing from canister. Do not attempt to clean secondary element. If secondary element is replaced, install new primary and secondary filter elements immediately to prevent dust from entering air intake system.

- Remove air filter canister cover.
- Remove and discard primary filter element.
- Remove and discard secondary filter element. Replace with a new secondary filter element.
- Install new primary filter element.
- Replace air filter canister cover.
- Position canister back in place and install hold-down strap.
- Lower hood.

4044, 4052, 4066 John Deere Servicing Cooling System

Checking Cooling System



A - Recovery Tank, B - Full Line, C - Low Line, D - Tank Cap

- Park machine safely.
- Allow JD Tractor engine to cool.
- Raise hood.
- Check recovery tank (A) coolant level:
- If engine is warm, coolant level should be between the FULL line (B) and the LOW line (C).
- If engine is cold, coolant level should be at the LOW line (C) on the recovery tank.
- Remove recovery tank cap (D) if needed to add coolant.
- Add recommended coolant.
- Install recovery tank cap.
- Lower hood.

Draining Cooling System

- Allow engine to cool.
- Raise hood.
- Remove right side panel.
- Slowly open radiator cap to the first stop to release all pressure.
- Close radiator cap tightly.
- Position drain pan under radiator. Open petcock and drain coolant.
- Drain coolant from JD 4044M, 4044R, 4052M, 4052R, 4066M, 4066R engine depending on model.
- Locate engine block drain plug at right side of engine, behind oil filter. Position drain pan under drain plug, remove drain plug, and allow all coolant to drain. Locate engine coolant hose at right side of engine, connected to oil filter. Position drain pan under hose, remove hose clamp, and allow all coolant to drain.
- When coolant drains from the recovery tank, remove the radiator cap.
- Close radiator petcock and install engine block drain plug or coolant hose and clamp.
- Flush cooling system.

Flushing Cooling System

- Fill cooling system with clean water and John Deere Cooling System Cleaner or John Deere Cooling System Quick Flush or an equivalent. Follow directions on the container.
- Install and tighten radiator cap.
- Start and run engine until it reaches operating temperature.
- Stop engine.
- Open petcock and engine block drain plug or coolant hose and clamp.
- Drain cooling system immediately before rust and dirt settle.
- Close petcock and engine block drain plug or coolant hose and clamp.

Filling Cooling System

Using incorrect coolant mixture can damage the radiator:

- Do not operate engine with plain water.
- Do not exceed a 50% mixture of coolant and water.
- Aluminum engine blocks and radiators require approved ethylene glycol base coolant.

Follow the directions on the container for correct mixture ratio.

- Allow radiator to cool.
- Remove radiator cap.
- Fill cooling system. Open operator station cooling system capacity is 6 L (1.6 gal.). Cab cooling system capacity is 8 L (2.1 gal.).
- Install and tighten radiator cap.
- Run engine until it reaches operating temperature.
- Stop JD 4044, 4052, 4066 engine.
- Allow engine to cool. (Some coolant may be drawn into the radiator from the recovery tank during cool down.)
- Check recovery tank coolant level. After engine cools, coolant level should be at the FULL COLD line on the recovery tank.
- Remove cap from recovery tank to add coolant if necessary.
- Install right side panel.
- Lower hood.

Cleaning Cooling Fins

Compressed air can cause debris to fly a long distance.

- Clear work area of bystanders.
- Wear eye protection when using compressed air for cleaning purposes.
- Reduce compressed air pressure to 210 kPa (2.1 bar) (30 psi).



A - Radiator, B - Transmission Oil Cooler, C - Fuel Cooler (JD 4066R Only), D - Air Conditioning Condenser (Cab Models Only), E - Charge Air Cooler (JD 4066M Only)

Reduce compressed air pressure to 210 kPa (2.1 bar) (30 psi) when cleaning radiator and cooling fins. Spray compressed air straight into radiator. Do not spray radiator on an angle or cooling fins can be bent.

- Allow engine to cool.
- Raise hood.
- Using compressed air or water, remove all dirt and debris from fins at front and rear of the following: Radiator, including fan shroud. Transmission oil cooler.

Checking and Cleaning Fuel Filter Sediment Bowl and Replacing Filter

Change filter when fuel level is low.

- Park machine safely. Allow 4044M, 4044R, 4052M, 4052R, 4066M, 4066R John Deere engine to cool.
- Check fuel sediment bowl. If water and deposits are detected, remove bowl and replace fuel filter.
- Move the fuel shutoff valve to the closed position.
- Position drain pan under fuel filter sediment bowl.
- Turn sediment bowl counterclockwise to remove.
- Remove and discard the fuel filter.
- Clean bowl.
- Install new filter to filter head.
- Install sediment bowl.
- Open fuel shutoff valve. Fuel system is self-bleeding.
- Turn key to the ON position for 10—15 seconds before attempting to start; electric pump purges air from sediment bowl.

Replacing Inline Fuel Filter

Change filter when fuel level is low.

- Remove right side panel.
- Position drain pan under fuel filter.
- Wipe dirt from around filter.
- Turn filter counterclockwise to remove.
- Install replacement filter by turning filter clockwise until gasket contacts filter base. Tighten additional 1/2 turn.
- Start and run engine at idle to check for leaks.

Cleaning Cab Air Filter

Remove any rear implement before servicing cab air filter. Do not stand on 3-point hitch or PTO shield.

- Remove two wing bolts, washers, and filter base.
- Remove filter from filter base, and clean with compressed air. Inspect filter for damage. Replace if necessary.
- Install filter into base.
- Install filter base, making sure six tabs on roof panel are installed into slots in filter base.
- Secure base assembly into roof panel with two washers and wing nuts.

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