Service Engine - Models GX325 and GX335

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

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

The following John Deere oils are preferred:

MX4888

· 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 dipstick (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.

M78397

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

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 dipstick (B).

NOTE: Change oil filter at recommended service interval.

7. Change oil filter:

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

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

c. Remove old filter and wipe off filter tray.

d. Apply a light coat of fresh oil to filter seal.

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

8. Close drain valve.

9. Add oil:

· With oil filter change: 1.7 L (1.8 qt)

· Without oil filter change: 1.6 L (1.7 qt)

10. Install and tighten dipstick.

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

12. Check oil level, add oil if necessary.

Cleaning Air Intake Screen and Engine Fins


IMPORTANT: Avoid damage! The engine 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.

3. Lower hood.

Servicing Air Cleaner Elements

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. Allow engine to cool.

3. Remove hood.

4. Remove air cleaner cover:

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· Model GX325 - Release cover latches (A) and remove cover (B).

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· Model GX335 - Remove plastic retainers (C) and cover (D).


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.

5. Inspect air cleaner:

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· Model GX325 - If precleaner (E) is dirty, remove it from paper element (F). If paper element is very dirty or damaged, remove wing nut (G) and element (F). Replace it with a new element.

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· Model GX335 - If precleaner (H) is dirty, remove it from paper element (I). If paper element is very dirty or damaged, remove wing nuts (J) and element (I). Replace with new element.

6. If precleaner is damaged, replace it. If precleaner is dirty, clean it as follows:

a. Wash it in a solution of warm water and liquid detergent. Do not wash paper element.

b. Rinse precleaner.

c. Squeeze excess water from precleaner.

d. Allow precleaner to air dry.

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

f. Squeeze precleaner to distribute oil evenly.

7. Install precleaner on paper element.

8. Install air cleaner cover and secure with original hardware.

9. Install hood.

Checking Spark Plugs

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. Allow engine to cool.

3. Raise the hood.

M96013

4. Disconnect spark plug wire (A) on each side of engine.

5. Remove spark plugs.

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

7. Inspect spark plugs for:

· Cracked porcelain.

· Pitted or damaged electrodes.

· Other wear or damage.

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

8. Replace spark plugs as necessary.

M85200

9. Check plug gap (B) with a wire feeler gauge. To change gap, bend outer electrode (C).

· Gap must be 0.75 mm (0.030 in.).

10. Install and tighten spark plug. Tighten spark plug to 15 N·m (11 lb-ft).

11. Connect spark plug wires.

12. Lower the 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 to prevent excessive fuel spillage.

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

2. Allow engine to cool.

3. Raise the hood.

M96016

4. Place a drain pan under fuel filter (A).

5. Note direction of arrow on fuel filter so new filter can be installed in the same direction.

6. Use a pliers to slide hose clamps (B) away from fuel 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. Make sure arrow on new filter is pointing in the direction of fuel flow. Connect hoses to filter.

9. Slide hose clamps in position to secure filter.

10. Check for leaks.

11. Lower the hood.

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