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Service Engine


Engine Warranty Maintenance Statement

Maintenance, repair, or replacement of the emission control devices and systems on this engine, which are being done at the customers expense, may be performed by any non-road engine repair establishment or individual. Warranty repairs must be performed by an authorized John Deere dealer.

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.

ˇ Connect a pipe extension to the engine exhaust pipe to direct the exhaust fumes out of the area.

ˇ Allow fresh outside air into the work area to clear the exhaust fumes out.

Engine Oil

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

The following John Deere oils are preferred:


M1999

ˇ TURF-GARDŽ

ˇ PLUS-4Ž


These oils meet the industry specification API Service Classification SJ or higher.

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:

ˇ Check oil level before operating.

ˇ Check oil level when the engine is cold and not running.

ˇ Keep level between the FULL and the ADD marks.

ˇ Shut off engine before adding oil.


NOTE: Check oil twice a day if you run engine over 4 hours in a day.

Make sure engine is cold when checking engine oil level.

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

2. Let engine cool.

3. Raise hood.


MX13647

Picture Note: Model X485 shown. Dipstick is located on right side of model X465 machine.

4. Remove dipstick (A) on left side of machine. Wipe dipstick with a clean rag.

5. Install dipstick. Be sure dipstick is all the way down.

6. Remove dipstick.


M72321

7. Check oil level on dipstick. Oil level should be between full mark "H" and low mark "L" on dipstick.

IMPORTANT: Avoid damage! If oil level is at or below "L", do not run engine.



MX13648

Picture Note: Model X485 shown.

8. If oil level is low, remove oil filler cap (B) on right side of machine.

9. Add oil to bring oil level no higher than "H" mark on dipstick.

10. Install dipstick.

11. Install and tighten oil filler cap.

12. Lower hood.

Changing Engine Oil and Filter

IMPORTANT: Avoid damage! Change the oil more often if the vehicle is used in extreme conditions:

ˇ Extremely dusty conditions.

ˇ Frequent slow or low-speed operation.

ˇ Frequent short trips.


1. Run engine a few minutes to warm oil.

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

3. Raise hood.


MX13649

4. Remove oil drain hose (A) from inside frame on front of machine to allow draining into pan.

5. Put drain pan under oil drain hose.

6. Loosen drain plug bolt (B) and allow oil to drain completely.

7. Return oil drain hose to inside of frame.

8. Tighten drain plug bolt.


MX13650

9. Clean dirt from around oil filter (C).

10. Put drain pan under filter drip tray hose (D).

11. Turn oil filter counterclockwise with a filter wrench to remove.

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

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


MX13648

14. Remove oil filler cap (E) on right side of machine. Models X465: Add approximately 1.6L (1.8 qt) of oil. Models X475, X485: Add approximately 2.0L (2.1 qt) of oil.

15. Install and tighten filler cap.

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

17. Stop engine. Fix any leaks before operating.

18. Check engine oil level. Add oil if necessary.

Cleaning Air Intake Screens

c CAUTION: Avoid injury! Compressed air can cause debris to fly a long distance.

ˇ Clear work area of bystanders.

ˇ Wear eye protection when using compressed air for cleaning purposes.

ˇ Reduce compressed air pressure to 210 kPa (30 psi).

IMPORTANT: Avoid damage! Air intake screens must be clear of dirt and debris 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.


MX13587

3. Remove side panels (A).

4. Clean air intake screens on side panels using a brush, cloth or water.

5. Clean rear air intake screen (B) with a brush, cloth or compressed air. Blow compressed air back toward seat.

6. Install side panels.

7. Lower hood.

Servicing Air Cleaner Element

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

c CAUTION: Avoid injury! Touching hot surfaces can burn skin. The engine and components will be hot if the engine has been running. Allow the engine to cool before servicing.

2. Allow engine to cool.

3. Raise hood.

4. Clean any dirt and debris from air cleaner before removing cover.


MX13655

Picture Note: Model X485 shown.

5. Models X475, X485: Remove nut (A), slotted washer (B) and upper case (C). Model X465: Remove cover nut and cover.

IMPORTANT: Avoid damage! Dirt and debris can enter the engine through a damaged filter element:

ˇ Do not wash paper element.

ˇ Do not attempt to clean paper element by tapping against another object.

ˇ Do not use pressurized air to clean element.

ˇ Replace element only if it is very dirty, damaged or the seal is cracked.



MX13656

Picture Note: Model X485 shown.

6. Inspect the foam precleaner without removing it. If the precleaner (C) is dirty:

ˇ Remove it from the filter carefully, leaving the paper element in the air cleaner housing.

ˇ Wash precleaner in a solution of warm water and liquid detergent.

ˇ Rinse precleaner thoroughly. Squeeze out excess water in a dry cloth until precleaner is completely dry.

NOTE: Do not oil precleaner.


MX13657

Picture Note: Model X485 shown.

7. Inspect the paper filter element without removing it. If the element is damaged or dirty:

ˇ Remove wing nut (D).

ˇ Carefully remove paper filter element (E) from air cleaner housing.

ˇ Clean air cleaner base very carefully, preventing any dirt from falling into carburetor.

ˇ Install new paper filter element into air cleaner. Make sure element is seated properly.

ˇ Install and tighten wing nut.

8. Install foam precleaner (C) on paper element.

NOTE: Models X475, X485: When installing slotted washer, rotate so all four holes in upper case are open.

9. Models X475, X485: Install upper case, slotted washer and nut. Model X465: Install cover and cover nut.

Checking Spark Plug

c CAUTION: Avoid injury! Touching hot surfaces can burn skin. The engine and components will be hot if the engine has been running. Allow the engine to cool before servicing.

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

2. Raise hood.


MX13648

3. Disconnect spark plug wire (A) on both sides of machine.

4. Remove spark plugs on both sides of machine.

5. Clean spark plugs carefully with a wire brush.

6. Inspect spark plugs for:

ˇ Cracked porcelain.

ˇ Pitted or damaged electrodes.

ˇ Other wear or damage.

NOTE: In Canada, replace spark plugs with resistor plugs only.

7. Replace spark plugs as necessary.


M85200

8. Check plug gap (B) with a wire feeler gauge. To change gap, move the outer electrode. Gap must be 0.75mm (0.030 in.).

9. Install and tighten spark plugs to 25Nˇm (18 lb-ft).

10. Connect spark plug wires.

11. Lower hood.

Recommended Engine Coolant

The following John Deere coolants are preferred:

ˇ COOL-GARDŽ PRE-DILUTED SUMMER COOLANT (TY16036).

ˇ COOL-GARDŽ CONCENTRATED SUMMER COOLANT (TY16034).

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

ˇ 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

Checking Coolant Level

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

2. Allow engine to cool.

3. Raise hood.


MX13651

4. Check recovery tank (A) coolant level:

ˇ If engine is warm (into green range on coolant temperature gauge), coolant level should be between the "H" line (B) and the "L" line (C).

ˇ If engine is cold, coolant level should be at the "L" line (C).

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 and tighten recovery tank cap.

8. Lower hood.

Draining Cooling System

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:

ˇ Shut off the engine and allow to cool.

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

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

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

2. Allow engine to cool.

3. Raise hood.


MX13601

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

5. Remove radiator cap.


MX13602

6. Put drain pan under drain hose (B) located behind left side panel.

7. Open radiator petcock (C). Drain coolant into pan.


MX15400

8. Put drain pan under drain plug bolt (D) on right side of machine.

9. Remove drain plug bolt and allow remaining coolant to drain.

10. Close radiator petcock.

11. Install drain plug bolt.

12. Flush or fill cooling system and install radiator cap.

Flushing Cooling System

NOTE: Cooling system capacity is 4.0L (4.2 qt).

1. Drain cooling system.

2. 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 can.

3. Install and tighten radiator cap.

4. Run engine until needle on coolant temperature gauge reaches the green range.

5. Stop engine.

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

7. Remove recovery tank:


MX13604

ˇ Hold tank (A) and remove screw (B).

ˇ Pull overflow hose (C) from tank and remove tank.

8. Remove tank cap and clean tank.

9. Install tank.

10. Install overflow hose to bottom of tank. Be sure hose is not kinked.

Filling Cooling System

IMPORTANT: Avoid damage! Using incorrect coolant mixture can damage the radiator:

ˇ Do not operate engine with plain water.

ˇ Use antifreeze approved for use in aluminum engines.

ˇ Do not exceed a 50% antifreeze mixture for the coolant.

ˇ Do not pour coolant or water into the radiator when the engine is hot.


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

Follow the directions on the container for correct mixture ratio.

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

2. Allow radiator to cool.

3. Fill cooling system. Cooling system capacity is 4.0L (4.2 qt).

4. Install and tighten radiator cap.

5. Run engine until needle on coolant temperature gauge reaches the green range.

6. Stop engine.

7. Check recovery tank coolant level:

ˇ Coolant level should be between the "H" line and the "L" line.

8. Remove cap from recovery tank to add coolant if necessary.

9. Lower hood.

Cleaning Oil Cooler and Radiator Fins

c CAUTION: Avoid injury! Compressed air can cause debris to fly a long distance.

ˇ Clear work area of bystanders.

ˇ Wear eye protection when using compressed air for cleaning purposes.

ˇ Reduce compressed air pressure to 210 kPa (30 psi).

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

2. Raise hood.


MX13587

3. Remove side panels (A).

NOTE: Air cooled models do not have radiator or screen.


MX13598

4. Remove screen (B) located behind left side panel.

5. Clean screen with a brush, compressed air or water.


MX13599

6. Release spring-loaded fasteners (C). Move oil cooler (D) and clean cooling fins on both sides of oil cooler using compressed air.

7. Clean cooling fins on both sides of radiator using compressed air.

8. Install spring-loaded fasteners in oil cooler.

9. Install screen.

10. Install side panels.

11. Lower hood.

Checking Radiator Hoses and Clamps

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

2. Raise hood.

3. Check radiator hoses for damage or cracking. Replace if needed.

4. Tighten hose clamps as needed.

5. Lower hood.

Adjusting Carburetor

NOTE: Carburetor is calibrated by the engine manufacturer and is not adjustable.

If engine is operated at altitudes above 1829 m (6,000 ft), some carburetors may require a special high altitude main jet. See your authorized dealer.

If engine is hard to start or runs rough, check the troubleshooting section of this manual.

Possible engine surging will occur at high throttle with transmission in "N" neutral and mower engagement lever disengaged. This is a normal condition due to the emission control system.

After performing the checks in the troubleshooting section and your engine is still not performing correctly, contact your authorized dealer.

Servicing Fan Belt

c CAUTION: Avoid injury! Fingers or loose clothing can get caught in rotating parts. Stop engine and wait for all moving parts to stop before servicing.

Checking Belt Tension

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

2. Allow engine to cool.

3. Raise hood.

4. Apply moderate thumb pressure to belt between driveshaft sheave and fan pulley. Belt should deflect inward approximately 13mm (1/2 in.).

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

Adjusting Belt Tension and Replacing Belt

1. Disconnect wires from spark plugs on both sides of machine.

NOTE: Rotate driveshaft for access to bolts, if necessary.


M71627

2. Remove three bolts (A) to disconnect drive shaft (B).

3. Remove three bolts (C) to remove outer sheave (D).

4. Remove belt (E) if it is to be replaced.

NOTE: To allow sheaves to fit closer together and increase belt tension, remove shim (F). Save shim for future use.

5. Remove shim (F) if belt is to be tightened. Leave shim in if installing a new belt.

6. Loosely install belt between sheave halves and start installing the three outer sheave-retaining bolts.

7. Rotate sheave assembly as bolts are tightened to allow belt to center in sheave halves and not be pinched in an off-center position.

8. Install driveshaft.

9. Connect spark plug wires.

10. Lower hood.

Replacing Fuel Filter (X465, X475)

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

ˇ Do not smoke while handling fuel.

ˇ Keep fuel away from flames or sparks.

ˇ Shut off engine before servicing.

ˇ Cool engine before servicing.

ˇ Work in a well-ventilated area.

ˇ 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. Raise hood.


MX15403

Picture Note: Model X475 shown.

4. Put drain pan under filter (A).

5. Disconnect hoses (B) from filter.

6. Connect hoses to new filter.

7. Check for leaks.

8. Lower hood.

Replacing Fuel Filter (X485)

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

ˇ Do not smoke while handling fuel.

ˇ Keep fuel away from flames or sparks.

ˇ Shut off engine before servicing.

ˇ Cool engine before servicing.

ˇ Work in a well-ventilated area.

ˇ 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. Raise hood.

4. Relieve fuel line pressure:


MX15401, MX15402

a. Loosen fuel pressure relief screw (A) on left side of machine to relieve pressure.

b. Tighten relief screw.


MX13658, MX13659

5. Remove cap screw (B) on both sides of fuel filter on right side of machine.

6. Put drain pan under filter.

7. Disconnect hoses from filter.

IMPORTANT: Avoid damage! Incorrect installation of fuel filter may cause engine damage. Install the filter with the arrow pointing in the direction of fuel flow for proper operation.


8. Connect hoses to new filter making sure filter arrow (C) is pointed in the direction of fuel flow.

9. Check for leaks.

10. Lower hood.

Adjusting Fuel Injection Pump

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, check the TROUBLESHOOTING section of this manual.

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