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Service Engine


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. 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.

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 - Gasoline Models

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



The following John Deere oils are preferred:

• TURF-GARD™

• PLUS- 4™

Other oils may be used if above John Deere oils are not available, provided they meet the following specification:

• API Service Classification SG or higher

Engine Oil - Diesel Model

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

The following John Deere oils are preferred:



• PLUS-50® (SAE 15W-40)

• TORQ-GARD SUPREME® (SAE 30)

• TORQ-GARD SUPREME® (SAE 5W-30)

• PLUS-4®

Other oils may be used if above John Deere oils are not available, provided they meet one of the following specifications:

• SAE 15W-40 - API Service Classification CF-4 or higher.

• SAE 5W-30 - API Service Classification CC or higher.

• SAE 10W-30 - API Service Classification CF or higher.

• SAE 30 - API Service Classification CF or higher.

Checking Engine Oil Level

IMPORTANT: Avoid damage! Avoid dirt and other contaminants from entering the oil dipstick tube location. Clean area around dipstick before removing.

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.

• Check oil level twice a day if you run engine over 4 hours a day.


1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX1669

Picture Note: Diesel engine shown.

3. Allow engine to set for 2-3 minutes. Remove dipstick (A). and wipe with a clean cloth.

4. Install dipstick.


M71680

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

• If oil is low, add oil to bring oil level no higher than level (B) on the dipstick.

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

6. Install dipstick.

7. Lower attachment.

Changing Engine Oil and Filter

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

• Extremely dusty conditions.

• Frequent slow or low-speed operation.

• Frequent short trips.


1. Run engine to warm the oil.

2. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

3. Park vehicle safely. (See Parking Safely in the Safety section.)

4. Place container under the oil drain location.


MX7255

Picture Note: Diesel engine shown.

5. Remove drain plug (A) located under the right side of the engine.

6. Remove oil filter (B).

• Locate filter under the right side of the engine.

• Turn filter counterclockwise to remove.

7. Apply a film of clean engine oil on gasket of new filter.

8. Install oil filter.

• Turn filter clockwise until gasket makes contact with mounting surface. Tighten 1/2-3/4 turn after gasket contact.

9. Install oil drain plug. Do not overtighten.

NOTE: An additional oil fill cap location is located on the right side of the engine.


MX1671

10. Remove oil fill cap (C) on top of engine.

11. Add approximately 2.1 L (2.2 qt) of oil.

12. Install oil fill cap.

13. Start engine.

• Run engine at a slow throttle speed for approximately two minutes.

14. Check area under engine for oil leaks.

15. Stop engine.

16. After approximately two minutes check engine oil level.

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


17. Remove dipstick. Wipe with a clean cloth.


M71680

18. Remove dipstick. Check oil level on dipstick; oil level should be between levels (D) and (E) on the dipstick.

• If oil is low, add oil to bring oil level no higher than level (D) on the dipstick.

• If oil level is above level (D) on the dipstick, drain to proper level.

19. Install dipstick in tube.

20. Install dipstick.

21. Lower attachment.

Checking Spark Plugs

c CAUTION: Avoid injury! Touching hot surfaces can burn skin. The engine, components, and fluids will be hot if the engine has been running. Be cautious and wear protective clothing when servicing or working near a hot engine and components.

IMPORTANT: Avoid damage! Do not clean spark plugs with abrasives.


1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)

3. Clean area around each spark plug.


MX1736

4. Disconnect the spark plug wire (A) from each plug.

5. Remove and inspect spark plugs:

• Clean each plug and check for damage; replace if necessary.

• If plugs are in good condition, check gap.


M85200

6. Check and adjust spark plug gap (B) to 0.76 mm (0.030 in.).

7. Install spark plugs.

• Tighten to 20 N•m (15 lb-ft).

8. Install each spark plug wire.

9. Lower attachment.

Cleaning Radiator Screen

c CAUTION: Avoid injury! Touching hot surfaces can burn skin. The engine, components, and fluids will be hot if the engine has been running. Be cautious and wear protective clothing when servicing or working near a hot engine and components.

1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX7252

3. Lift radiator screen (A) from position in front of the engine radiator.

4. Clean screen with a brush or compressed air.

5. Install grille screen.

6. Lower attachment.

Cleaning Radiator Cooling Fins and Fan Shroud

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! Dirty cooling fins and radiator screens can cause engine overheating. The radiator cooling fins and fan shroud must be clean.


1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX7252

3. Remove radiator screen (A).


MX1688

4. Remove dirt and debris from the auxiliary hydraulics, oil cooler, radiator cooling fins (B) and fan shroud (C) using compressed air or water.

5. Check radiator fins for damage.

6. Install radiator screen.

7. Lower attachment.

Cleaning Rubber Dust Unloading Valve

IMPORTANT: Avoid damage! Do not operate engine without air cleaner element and rubber dust unloading valve installed.


1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX1658

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

4. Install dust unloading valve.

5. Lower attachment.

Servicing Air Cleaner Element

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

• Do not wash paper element.

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

• Do not use pressurized air to clean element.

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


Checking Air Cleaner Element

1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)

IMPORTANT: Avoid damage! Dirt and debris can enter engine when air cleaner canister is opened. Do not open canister unless required for scheduled service. This will keep contamination of the intake system to a minimum.

Check filter element more frequently if operating in dusty conditions.



MX1658

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

4. Visually inspect each element before removing. Replace element only if damaged or very dirty.

Replacing Primary Air Filter Element


MX1659

1. Remove and discard primary element (C). Replace with a new primary filter element.

2. Install air cleaner canister cover (B).

• Check instruction molded into canister cover for proper installation.

• Rubber dust unloading valve (D) should be pointed downward when the cover is properly installed.

3. Engage latches (A).

Replacing Secondary Air Filter Element

1. Remove air cleaner canister cover.

2. Remove primary air filter element.


MX1660a

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

4. Install primary air filter element.

5. Replace air cleaner canister cover.

6. Lower attachment.

Check Air Intake Hose, Hydraulic Hoses, Radiator Hoses and Clamps

1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX14992

A - Upper Radiator Hoses (4 Clamps)

B - Lower Radiator Hoses (6 Clamps)

C - Air Intake Hose (2 Clamps)

D - Hydraulic Hose (2 Clamps)

E - Hydraulic Suction Hose (6 Clamps)

F - Fuel Hose (4 Clamps)

G - Coolant Hoses (8 Clamps)

3. Check hoses for leaking or damage and adjustable clamps for tightness. Replace if necessary.

4. Lower attachment.

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.

Recommended Engine Coolant

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

• Do not operate engine with plain water.

• Use ethylene-glycol based antifreeze approved for use in aluminum radiators or aluminum engines.

• Do not exceed a 50% mixture of coolant and water.

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


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.

Checking Coolant Level

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

• Do not operate engine with plain water.

• Use ethylene-glycol based antifreeze approved for use in aluminum radiators or aluminum engines.

• Do not exceed a 50% mixture of coolant and water.

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


1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX1691

3. Check recovery bottle (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 bottle.

4. Remove recovery bottle cap (D) to add coolant.

5. If coolant is low, add specified ratio of antifreeze and water.

6. Install and tighten recovery bottle cap.

7. Clean debris from the air intake screen, fan shroud, radiator cooling fins and auxiliary oil cooler coils.

8. Check condition of coolant system hoses and clamps. Check for leaks or loose connections.

Servicing Cooling System

Draining Cooling System

1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX14993

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

4. Close radiator cap tightly.


MX14994

5. Open radiator petcock (B). Drain coolant into a pan.

6. When coolant drains from the recovery bottle, remove radiator cap.

7. After all coolant has drained, close radiator petcock.

8. 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 the can.


MX14993

2. Install and tighten radiator cap (A).

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

4. Stop engine.


MX14994

5. Open radiator petcock (B).

• Drain cooling system immediately before rust and dirt settle.

6. Close radiator petcock.

Filling Cooling System

1. Fill cooling system with approximately 3.8 L (4.1 qt) of coolant.

• Certain geographical areas may require protection from lower temperatures. See the label on your antifreeze container or consult your John Deere dealer to obtain the latest information and recommendations.

• John Deere Cooling System Sealer or its equivalent may be added to the radiator to seal leaks. Do not use any other additives in the cooling system.

2. Install and tighten radiator cap.

3. Run engine until it reaches operating temperature.

4. Stop engine.


MX1691

5. Check recovery bottle (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 bottle.

6. Remove cap (D) from recovery bottle to add coolant if necessary.

7. Check condition of coolant system hoses and clamps.

8. Lower attachment.

Replace Fuel Filter (Gas Models)

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. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX1738

3. Slide hose clamps (A) away from filter (B) located on the right side of the engine.

4. Disconnect hoses from filter.

NOTE: When installing a new fuel filter, make sure the filter arrow (C) is pointed in the direction of fuel flow.

5. Install new filter.

6. Connect hoses to new filter.

7. Install hose clamps.

8. Lower attachment.

Servicing Fuel Filter Sediment Bowl (Diesel Models)

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.

Checking

1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX1670

3. Visually check for water and deposits in the sediment bowl (A).

4. If necessary, clean bowl and replace filter.

Cleaning and Replacing

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

2. Turn collar (C) to remove bowl and filter. Discard filter.

3. Clean bowl.

4. Install new filter and bowl.

5. Tighten collar.

6. Open fuel shut-off valve.

7. Lower attachment.

Checking and Adjusting Alternator Belt

c CAUTION: Avoid injury! Entanglement in a belt or sheave can cause serious injury. Stop engine and wait for all moving parts to stop.

Check Belt Tension

1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX3091

3. Check alternator belt (A) through shield opening:

• Inspect belt for excessive wear, damage or stretching while in position on the sheaves.

• Apply thumb pressure to the belt approximately halfway between the sheaves. Belt should deflect inward approximately 10 mm (3/8 in.).

Adjusting Belt Tension


MX14993

1. Loosen adjustment bolt (B).

2. Loosen alternator mounting bolt (C).

3. Apply outward pressure to the alternator housing.

4. Tighten alternator adjustment bolt (B) and mounting bolt (C).

5. Check belt tension:

• Apply thumb pressure to the belt approximately halfway between the sheaves. Belt should deflect inward approximately 10 mm (3/8 in.).

6. Lower attachment.

Replacing Alternator Belt (Gas Models)

c CAUTION: Avoid injury! Entanglement in a belt or sheave can cause serious injury. Stop engine and wait for all moving parts to stop.

1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX3091

3. Remove nut (A), four screws (B) and belt shield (C) from the air cleaner support bracket (D).


MX14979

4. Remove two hex bolts (E), flanged lock nuts and skid plate (F) mounted under the vehicle in front of the engine.


MX1740a

5. Remove four cap screws (G) and pulsar bracket (H) .


MX14993

6. Loosen alternator adjustment bolt (I).

7. Remove alternator mounting bolt (J).

8. Apply inward pressure to the alternator housing.

9. Remove worn belt from the alternator sheave and both engine sheaves.

10. Install new belt.

11. Install alternator mounting bolt (J). DO NOT tighten.

12. Apply outward pressure to the alternator housing.

13. Tighten adjustment bolt (I) and mounting bolt (J).

14. Check belt tension:

• Apply thumb pressure to the belt approximately halfway between the sheaves. Belt should deflect inward approximately 10 mm (3/8 in.).

15. Install pulser bracket with four cap screws.

NOTE: Install bolts from inside to the outside of the skid plate.

16. Install skid plate with two hex bolts and flanged lock nuts removed earlier.

17. Lower attachment.

Replacing Alternator Belt (Diesel Models)

c CAUTION: Avoid injury! Entanglement in a belt or sheave can cause serious injury. Stop engine and wait for all moving parts to stop.

1. Raise attachment to service position. (See Using the Lift Cylinder Safety Support in the Safety section.)

2. Park vehicle safely. (See Parking Safely in the Safety section.)


MX3091

3. Remove nut (A), four screws (B) and belt shield (C) from the air cleaner support bracket (D).


MX14993

4. Loosen adjustment bolt (E).

5. Remove alternator mounting bolt (F).

6. Apply inward pressure to the alternator housing.

7. Remove worn belt from the alternator sheave and both engine sheaves.

8. Install new belt.

9. Install alternator mounting bolt (F). DO NOT tighten.

10. Apply outward pressure to the alternator housing.

11. Tighten alternator adjustment bolt (E) and mounting bolt (F).

12. Check belt tension:

• Apply thumb pressure to the belt approximately halfway between the sheaves. Belt should deflect inward approximately 10 mm (3/8 in.).

13. Lower attachment.