Service Engine - Models 325 and 335

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 vehicle 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 (Gas)

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

The following John Deere oils are preferred:

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· 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

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 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. Lift hood.

3. Clean area around dipstick to prevent debris from falling into crankcase.

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4. Remove dip stick (A). Wipe with clean cloth.

5. Install dipstick into tube, but DO NOT tighten it. Let dipstick threads rest on top of tube.

6. Remove dipstick.

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7. Check oil level on dipstick. Oil must be between ADD and FULL marks.

8. If oil level is low, add oil to bring oil level no higher than FULL mark on dipstick.

9. Install and tighten dipstick. Lower hood.

Changing Engine Oil and Filter

1. Run engine to warm oil.

2. Park machine safely on level surface. (See Parking Safely in the Safety Section.)

3. Lift hood.

4. Put drain pan under drain valve. If available, install drain hose.

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5. Open drain valve (A) and drain oil into oil drain pan. Allow oil to drain completely.

6. Remove dip stick (B).

7. Wipe dirt from around oil filter (C).

8. Place a drain pan or funnel under filter tray.

9. Remove old filter and wipe off filter tray.

10. Put a light coat of fresh, clean oil on the filter gasket.

11. Install replacement oil filter by turning oil filter to the right (clockwise) until the rubber gasket contacts filter base. Tighten filter an additional one-half turn.

12. Close drain valve.

13. Add oil.

14. Install and tighten dipstick.

15. Start and run engine at idle to check for leaks. Stop engine. Fix any leaks before operating.

16. Check oil level, add oil if necessary.

Cleaning Air Intake Screen and Engine Fins


IMPORTANT: Avoid damage! The engine is air-cooled and requires a large amount of air intake when running. Reduced air intake can cause overheating: · Keep air intake screen and cooling fins clean. · Keep covers and screens in place.

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

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2. Clean air intake screen (A), cooling fins and external surfaces (B), with rag, brush, vacuum or compressed air.

Servicing Air Cleaner Elements (Model 325)

1. Park machine safely. (See Parking 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. Let engine cool.

3. Remove hood.

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4. Unhook both cover latches (A) to remove cover (B).

NOTE: If precleaner or paper element has a break or is damaged, replace it.

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5. If precleaner (C) is dirty, remove it from paper element (E).

6. If paper element is excessively dirty, remove wing nut (D) and element (E). Replace it with a new 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.

7. If precleaner is dirty, clean it as follows:

· Wash it in a solution of warm water and liquid detergent. DO NOT wash paper element.

· Rinse precleaner.

· Squeeze excess water from precleaner.

· Allow precleaner to air dry.

· Add approximately 30 ml (1 oz.) of clean engine oil to precleaner.

· Squeeze precleaner to distribute oil evenly.

8. Install precleaner on paper element.

9. Install air cleaner cover and secure both cover latches.

10. Install hood.

Servicing Air Cleaner Elements (Model 335)

1. Park machine safely. (See Parking 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. Let engine cool.

3. Remove hood.

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4. Remove both plastic retainers (A) and cover (B).

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5. If precleaner (C) is dirty, remove it from paper element (D).

6. If paper element is excessively dirty, remove wing nuts (E) and element (D). Replace it with a new 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.

7. If precleaner is dirty, clean it as follows:

· Wash it in a solution of warm water and liquid detergent. DO NOT wash paper element.

· Rinse precleaner.

· Squeeze excess water from precleaner.

· Allow precleaner to air dry.

· Add approximately 30 ml (1 oz.) of clean engine oil to precleaner.

· Squeeze precleaner to distribute oil evenly.

8. Install precleaner on paper element.

9. Install air cleaner cover and secure with plastic retainers.

10. Install hood.

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. Lift hood.

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2. Disconnect spark plug wires (A), one on each side.

3. Remove spark plugs.

4. Clean each spark plug carefully with a wire brush.

5. Inspect spark plugs for:

· Cracked porcelain.

· Pitted or damaged electrodes.

· Other wear or damage.

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

6. Replace spark plugs as necessary.

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7. Check plug gap with a wire feeler gauge. To change gap, bend the outer electrode.

Spark Plug Gap - 0.7 mm (0.028 in.)

8. Install and tighten spark plug. Tighten spark plug to 20 N·m (15 lb-ft).

9. Connect spark plug wires.

10. 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 John Deere 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 John Deere dealer.

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 and lift hood. (See Parking Safely in the Safety Section.)

2. Let engine cool.

3. Lift hood.

4. Put a drain pan under fuel filter.

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5. Slide two hose clamps (A) away from fuel filter (B) using a pliers.

6. 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.

7. Connect hoses to new filter making sure the filter arrow is pointed in the direction of the fuel flow.

8. Install clamps and check for leaks and lower hood.

Introduction

Product Identification

Safety

Operating

Replacement Parts

Service Intervals

Service Lubrication