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Service Engine


Avoid Fumes

c CAUTION: Avoid injury! Engine exhaust fumes contain carbon monoxide and can cause serious illness or death.

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 the exhaust fumes out.

Engine Oil



Choose oil viscosity based on the expected air temperature range during the period between oil changes.

John Deere PLUS-50™ oil is recommended. John Deere TORQ-GARD SUPREME™ and oils meeting ACEA Specification E4/E5 may also be used.

Other oils may be used if they meet one or more of the following: API Service Classification CI-4, API Service Classification CH-4, or ACEA Specification E3.

Multi-viscosity diesel engine oils are preferred. Do not use break-in oils.

Checking Engine Speeds

Check engine speeds when engine is warmed up and not under load.

1. See low and high idle speeds in the SPECIFICATIONS section.

2. Observe tachometer.

3. If engine speeds are not within specifications, see your John Deere dealer.

Checking Engine Oil Level

IMPORTANT: Avoid damage! Failure to check the oil level regularly could lead to serious 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.


NOTE: Check engine oil when engine is cold. If engine is warm, allow to cool for at least five minutes before checking oil.

1. Park the machine safely. (See Parking Safely in the SAFETY section.)

IMPORTANT: Avoid damage! Dirt and contamination can enter engine when checking oil level. Clean area around dipstick before loosening or removing.



MX20949

2. Remove dipstick (A). Wipe with a clean cloth.

3. Install dipstick.


MIF

4. Remove dipstick.

5. Check oil level on dipstick. Oil level should be between levels (B) and (C) on dipstick.

6. If oil level is low:

a. Remove oil fill cap (D).

b. Add proper engine oil until oil level is within operating range on dipstick. Do not overfill.

7. Install oil fill cap (D).

8. If oil is above level (B) on the dipstick, drain to proper level.

9. Install dipstick.

Changing Engine Oil and Filter

1. Run engine to warm the oil.

2. Park machine safely. (See Parking Safely in the SAFETY section.)

3. Place drain pan under oil drain located on left side of engine.


MX20949

4. Remove drain plug (A).

• Remove two drain plugs on model 3720.

5. Wipe dirt from around oil filter (B).

6. Turn filter counter-clockwise to remove.

7. Put a light coat of clean engine oil on the gasket of new filter.

8. Install replacement oil filter by turning filter clockwise until gasket contacts filter base. Tighten additional one-half turn.

9. Install drain plug. Do not overtighten.

• Install two drain plugs on model 3720.

10. Remove oil fill cap (C).

11. Add recommended engine oil.

12. Install oil fill cap.

13. Start and run engine at idle to check for leaks.

14. Stop engine. Fix any leaks before operating.

15. Check engine oil level and add oil if necessary.

Cleaning Air Filter Dust Unloading Valve

IMPORTANT: Avoid damage! Prevent damage to the engine. Never operate engine without air cleaner elements and rubber dust unloading valve installed.


1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Allow engine to cool.

3. Raise hood.


MX21767

4. Remove and clean rubber dust unloading valve (A). Replace if damaged.

5. Install valve.

6. Lower hood.

Servicing Air Filter Element

IMPORTANT: Avoid damage! Dirt and debris can enter the engine when removing the filter element. Service filter elements only when red signal is in view in the instrument panel. Shut off engine and turn off all lights before service.


Servicing Primary Element:

1. Park the machine safely. (See Park Safely in the SAFETY section.)

2. Allow engine to cool.

3. Check to be sure key switch and all lights are off. If the key switch or any lights are left on, the air restriction indicator light may continue to flash even after the filter has been replaced.

4. Raise hood.


MX21767

5. Release latches (A) and remove air cleaner canister cover (B).


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6. Remove and discard primary element (C). Clean out any dirt in canister, taking care not to damage the secondary filter element. Replace with a new primary filter element.

7. Install air cleaner canister cover (B) with rubber dust unloading valve (D) pointing downward.

8. Check instruction molded into canister cover for proper installation.

9. Hook latches (A) onto cover.

10. Lower hood.

Servicing Secondary Element:

IMPORTANT: Avoid damage! Secondary 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 element immediately to prevent dust from entering air intake system.


1. Remove air cleaner canister cover.

2. Remove and discard primary air filter element.


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3. Remove and discard secondary air filter element (A). Replace with a new secondary air filter element.

4. Install new primary air filter element.

5. Replace air cleaner canister cover.

6. Lower hood.

Checking Air Filter Hose

1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Raise hood.

NOTE: Upper air intake flange must be properly installed into shroud adapter (A) on radiator support frame.


MX21817


MX21766

Picture Note: Tractor without cab shown.


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Picture Note: Tractor with cab shown.

3. Locate lower air intake hose (B) below muffler, and tighten hose clamps (C).

4. Lower hood.

Checking Air Restriction Indicator Light

c CAUTION: Avoid injury! Servicing a machine while the engine is running is dangerous.

• Engine exhaust fumes contain carbon monoxide and can cause serious illness or death. Do not run an engine in an enclosed area without adequate ventilation.

• Be cautious and wear protective clothing when servicing or working near a hot engine and components.

• Keep hands, clothing, jewelry and long hair away from moving parts.

1. Park the machine safely. (See Park Safely in the SAFETY section.)

2. Start the engine.

3. Raise hood.


MX20948

4. Block the air intake hose (A) with cardboard or other solid material. Do not block with a cloth or any other material which would allow air to flow.

5. Increase throttle to full engine rpm.

6. The air restriction indicator light on the instrument panel should illuminate.

7. Turn off all light switches and stop the engine. The air restriction indicator light should go out.

8. Remove block to air intake hose and lower the hood.

Service Cooling System Safely


TS281

c CAUTION: Avoid injury! The radiator will be hot and can burn skin. Built-up pressure may cause explosive release of coolant when the radiator cap is removed:

• Shut off the engine and allow to cool.

• Do not remove the cap unless the radiator and the engine are cool enough to touch with bare hands.

• Slowly loosen the cap to the first stop to release all pressure. Then remove the cap.

Checking Coolant Level

IMPORTANT: Avoid damage! 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 based antifreeze.


NOTE: If you suspect a leak, check the coolant level by removing the radiator cap and looking inside.

1. Park the vehicle safely. (See Park Safely in the SAFETY section.)

2. Allow engine to cool.

3. Raise hood.


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4. Check recovery tank (A) coolant level:

• If engine is warm, coolant level should be between the FULL HOT line (B) and the FULL COLD line (C).

• If engine is cold, coolant level should be at the FULL COLD line (C) on the recovery tank.

5. Remove recovery tank cap (D) if necessary to add coolant.

6. Add pre-diluted coolant or specified ratio of antifreeze and water.

7. Install recovery tank cap.

8. Lower hood.

Recommended Engine Coolant

IMPORTANT: Avoid damage! Using incorrect coolant mixture can cause overheating and damage to the radiator and engine:

• 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 based antifreeze.


The following John Deere coolants are preferred:

• COOL-GARD® PRE-DILUTED SUMMER COOLANT (TY16036).

• COOL-GARD® CONCENTRATED SUMMER COOLANT (TY16034).

If neither of the recommended coolants is available, use a glycol base coolant that meets the following specification:

• ASTM D4985 (JDM H24A2).

Check container label before using to be sure it has the appropriate specifications for your machine. Use coolant with conditioner or add conditioner to coolant before using.

If using concentrate, mix approximately 50 percent antifreeze with 50 percent distilled or deionized water before adding to cooling system. This mixture will provide freeze protection to -37 degrees C (-34 degrees F).

Certain geographical areas may require lower temperature protection. See the label on your antifreeze container or consult your John Deere dealer to obtain the latest information and recommendations. Never exceed the maximum dilution rate for the coolant you are using. Exceeding the maximum rate will greatly reduce the coolant effectiveness.

Servicing Cooling System

Draining Cooling System

1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Allow engine to cool.

3. Raise hood.


MX32645

4. Slowly open radiator cap (A) to the first stop to release all pressure.

5. Close radiator cap tightly.


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6. Position drain pan under radiator petcock (B) on left side of machine. Open petcock and drain coolant.


MX35769

Picture Note: Tractor with cab shown.

7. Disconnect coolant hose (C) at connection (D) to oil filter base, and allow all coolant to drain into pan.

8. After coolant drains from the recovery tank, remove radiator cap.

9. Close radiator petcock and connect coolant hose.

10. Flush cooling system.

Flushing Cooling System

1. 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 container.

2. Install and tighten radiator cap.

3. Start and run engine until it reaches operating temperature.

4. Stop engine.

5. Open radiator petcock and disconnect coolant hose.

6. Drain cooling system immediately before rust and dirt settle.

7. Close radiator petcock and onnect coolant hose.

Filling Cooling System

IMPORTANT: Avoid damage! 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 based antifreeze.


NOTE: John Deere COOL-GARD coolant is recommended when adding new coolant to the cooling system.

Follow the directions on the container for correct mixture ratio.

1. Allow radiator to cool.

2. Fill cooling system with recommended coolant:

3. Install and tighten radiator cap.

4. Run engine until it reaches operating temperature.

5. Stop engine.

6. Allow engine to cool. (Some coolant may be drawn into the radiator from the recovery tank during cool down.)

7. Raise hood.


MX32645

8. Check recovery tank (A) coolant level:

• After engine cools, coolant level should be at the FULL COLD line (B) on the recovery tank.

9. Remove cap (C) from recovery tank to add coolant if necessary.

10. Lower hood.

Checking Radiator Hoses

1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Allow engine to cool.

3. Raise hood.


MX20937

Picture Note: Tractor without cab shown.


MX35769

Picture Note: Tractor with cab shown.

4. Check lower radiator hose (A) for damage or cracking. Replace if necessary.

5. Tighten hose clamps (B) as needed.


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6. Check upper radiator hose (C) for damage or cracking. Replace if necessary.

7. Tighten hose clamps (D) as needed.

8. Lower hood.

Adjusting Compressor Belt Tension

c CAUTION: Avoid injury! Rotating parts can catch fingers, loose clothing, or long hair. Wait for engine and all moving parts to stop before leaving operator’s station to adjust or service machine.

Checking Belt Tension

1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Raise hood.


MX35883

3. Apply moderate thumb pressure to belt (A) halfway between the pulleys. Belt should deflect inward approximately 9 mm (3/8 in.).

4. Adjust belt tension if deflection is more or less than specified.

Adjusting Belt Tension

1. Loosen nut (B) on tensioner sheave (C).

2. Slide tensioner downward for more tension on belt or upward for less tension on belt.

3. Tighten nut on tensioner sheave and check belt tension. Adjust as necessary.

4. Lower hood.

Replacing Belt

NOTE: Replace alternator belt if excessive wear, damage or stretching is detected.

1. Raise hood.

2. Disconnect black negative (-) cable from battery.

3. Loosen nut (B) on tensioner sheave (C).

4. Slide tensioner upward to remove tension on belt, and remove belt from compressor sheave, engine sheave, and tensioner sheave.

5. Install new belt over engine sheave and then onto remaining sheaves.

6. Apply pressure to tensioner sheave (C) until tension is correct and tighten nut (B).

7. Check belt tension, and adjust as necessary.

8. Connect black negative (-) cable to battery.

9. Lower hood.

Servicing the Alternator Belt

c CAUTION: Avoid injury! Rotating parts can catch fingers, loose clothing, or long hair. Wait for engine and all moving parts to stop before leaving operator’s station to adjust or service machine.

Checking Belt Tension

1. Park machine safely. (See Parking Safely in the SAFETY section.) Allow engine to cool.

2. Raise hood.


MX4765

Picture Note: Tractor without cab shown.

3. Apply moderate thumb pressure to belt (A) halfway between the pulleys. Belt should deflect inward approximately 9 mm (3/8 in.).

4. Adjust belt tension if deflection is more or less than specified.

Adjusting Belt Tension

1. Loosen top adjusting bolt:

• For tractors without a cab, loosen top adjusting bolt (B).

• For tractors with a cab, loosen top adjusting bolt and nut.

2. Loosen mounting bolt (C).

3. Apply outward pressure to alternator housing until tension is correct.

4. Tighten bolts (B) and (C).

5. Check belt tension.

6. Lower hood.

Replacing Belt

NOTE: Replace alternator belt if excessive wear, damage or stretching is detected.

1. Raise hood.

2. Disconnect black negative (-) cable from battery.


MX4773

3. Loosen top adjusting bolt:

• For tractors without a cab, loosen top adjusting bolt (A).

• For tractors with a cab, loosen top adjusting bolt and nut.

4. Loosen mounting bolt (B).

5. Apply inward pressure to alternator housing.

6. Remove belt (C) from alternator sheave, fan sheave and crankshaft sheave.

7. Route defective belt over fan and remove.

8. Install new belt over fan and onto sheaves.

9. Apply outward pressure to alternator housing until tension is correct.

10. Tighten bolts (A) and (B).

11. Check belt tension. Adjust as necessary.

12. Connect black negative (-) cable to battery.

13. Lower hood.

Servicing Water Separator Sediment Bowl

c CAUTION: Avoid injury! Fuel vapors are explosive and flammable:

• Do not smoke while handling fuel.

• Keep fuel away from flames or sparks.

• Shut off engine before servicing.

• Cool engine before servicing.

• Work in a well-ventilated area.

• Clean up spilled fuel immediately.

NOTE: Change filter when fuel is low.

1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Allow engine to cool.

NOTE: Red ring in bottom of sediment bowl will float on water. If ring is floating, sediment bowl should be cleaned.


MX21816

3. Check for water and deposits in sediment bowl (A).

4. Clean sediment bowl and replace fuel filter if necessary.

Cleaning Water Separator Sediment Bowl

1. Close fuel shut-off valve (B).

2. Position drain pan under sediment bowl to catch fuel spillage.

3. Turn locking collar (C) counterclockwise to remove bowl.

4. Remove and retain the plastic ring and spring from sediment bowl.

5. Clean bowl, plastic ring, and spring.

6. Install plastic ring and spring in original position in sediment bowl.

7. Place sediment bowl and locking collar in position.

8. Tighten locking collar to filter head to secure.

9. Open fuel shut-off valve.

NOTE: Fuel system is self bleeding.

10. Crank engine to bleed fuel system.

Cleaning Fuel Filter Sediment Bowl and Replacing Filter

c CAUTION: Avoid injury! Fuel vapors are explosive and flammable:

• Do not smoke while handling fuel.

• Keep fuel away from flames or sparks.

• Shut off engine before servicing.

• Cool engine before servicing.

• Work in a well-ventilated area.

• Clean up spilled fuel immediately.

NOTE: Change filter when fuel is low.

1. Park machine safely. (See Parking Safely in the SAFETY section.) Allow engine to cool.

2. Raise hood.


MX20939

3. Close fuel shut-off valve (A).

4. Position drain pan under fuel filter sediment bowl to catch fuel spillage.

5. Turn locking collar (B) counterclockwise to remove bowl (C).

6. Remove and discard the fuel filter.

7. Remove and retain the plastic ring and spring from sediment bowl.

8. Clean bowl, plastic ring, and spring.

9. Install plastic ring and spring in original position in sediment bowl.

10. Install new filter to filter head.

11. Place sediment bowl and locking collar in position.

12. Tighten locking collar to filter head to secure.

13. Open fuel shut-off valve.

14. Lower hood.

NOTE: Fuel system is self bleeding.

15. Crank engine to bleed fuel system.

Replacing Fuel Filter

c CAUTION: Avoid injury! Fuel vapors are explosive and flammable:

• Do not smoke while handling fuel.

• Keep fuel away from flames or sparks.

• Shut off engine before servicing.

• Cool engine before servicing.

• Work in a well-ventilated area.

• Clean up spilled fuel immediately.

NOTE: Change filter when fuel is low.

1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Allow engine to cool.

3. Close fuel shut-off valve.


MX21816

4. Position drain pan under fuel filter (A) to catch fuel spillage.

5. Turn filter counterclockwise to remove and discard.

6. Apply fuel to surface of new filter gasket.

7. Install new filter to filter head. Tighten to one complete turn after filter contacts head.

8. Open fuel shut-off valve.

Fuel Injection Pump

IMPORTANT: Avoid damage! Do not clean a warm or hot fuel injection pump with steam or water. Clean with compressed air if pump is not cooled.


NOTE: The fuel injection pump is calibrated by the engine manufacturer and should not require any adjustments.

If engine is hard to start, lacks power, or runs rough, see Troubleshooting Section of this manual.

After performing the check in the troubleshooting section and your engine is still not performing correctly, contact your John Deere dealer.

Fuel Injection Nozzles

IMPORTANT: Avoid damage! Do not service or remove fuel injection nozzles. Service life of injection nozzles may be shortened by overheating, improper operation, poor fuel quality, or excessive idling.


If injection nozzles are not working correctly or are dirty, engine will run poorly. See your John Deere dealer for service.

Cleaning Grille and Side Screens

IMPORTANT: Avoid damage! Grille and side screens must be clean to prevent engine from overheating and to allow adequate air intake.



MX32640

1. Check grille (A) and side screens (B), on both sides, for dirt, grass clippings and debris.

2. Clean with a brush or cloth.

Cleaning Radiator Screen and Fins

c CAUTION: Avoid injury! 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 (30 psi).

IMPORTANT: Avoid damage! The radiator cooling screen must be clean to prevent engine from overheating and to allow adequate air intake.


1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Raise hood.


MX32637

Picture Note: Tractor without cab shown.

3. Lift and remove radiator screen (A) off of clips (B) on top of radiator.

4. Clean screen with compressed air, brush or cloth, or screen may be carefully washed to remove dirt and debris.

IMPORTANT: Avoid damage! Reduced air intake can cause overheating. Keep radiator cooling fins clean.

Do not use pressure washers to clean radiator cooling fins. The force produced by pressure washers will damage the radiator and cooling fins.

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



MX32639


MX32638

5. Remove all dirt and debris from radiator fins (C), and fan shroud (D) using compressed air or water.

6. Install radiator screen.

7. Lower hood.