Service Engine

Avoid Fumes

c CAUTION: Avoid injury! Engine exhaust fumes can cause sickness or death:

· If it is necessary to run an engine in an enclosed area, use an exhaust pipe extension to remove the fumes.

· Always try to work in a well ventilated area.

Engine Oil

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

The following oil is preferred:

TS1412

· John Deere PLUS-4®

Other oils may be used if they meet one of the following:

· API Service Classification SG

· API Service Classification SF

· CCMC Specification G4

Oils meeting Military Specification MIL-L-46167B may be used as arctic oils.

Checking Engine Oil Level


IMPORTANT: Avoid damage! Do not check or add oil while engine is running.

Service Interval: Check oil level on a daily basis.

M86300

1. Park mower on a level surface. Stop engine.

2. Remove dipstick (A). Wipe it clean.

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

4. Remove dipstick. Check oil level. Oil should be between ADD and FULL on dipstick.

5. Add oil if necessary. (See Engine Oil in this section for correct oil.)

6. Install and tighten dipstick.

Changing Engine Oil


IMPORTANT: Avoid damage! To help prevent damage to engine: · Change oil and filter after first 25 hours of operation. (See Service Interval Chart for remaining intervals.)

M85243

1. Park mower on a level surface. Stop engine.

2. Drain oil:

· Put container under drain tube (A).

· Loosen drain plug (B).

· After oil drains, tighten plug.

3. Remove dipstick (C).

4. Add oil slowly into dipstick tube:


MODEL	Without Filter	With Filter
GS45	1.3 L (1.4 qt.) (45 oz.)	1.6 L (1.7 qt.) (53 oz.)
GS75	1.7 L (1.8 qt.) (56 oz.)	1.9 L (2 qt.) (64 oz.)

5. Wipe dipstick with clean rag.


IMPORTANT: Avoid damage! To help prevent damage to engine when you mow on slopes, add oil to FULL level.

6. Install dipstick. Let it rest on threads.

7. Check oil level.Remove dipstick and check oil level: Oil must be between ADD and FULL.

Changing Engine Oil Filter

c CAUTION: Avoid injury! To help prevent injury when you change filter:

· STOP engine. Let it cool.


IMPORTANT: Avoid damage! To help prevent damage to engine, change oil and filter after first 25 hours of operation. (See Service Interval Chart for remaining intervals.)

M85235

1. Remove oil filter (A):

· Put small container under filter to catch draining oil.

· Turn filter counterclockwise to remove it.

· Remove rubber seal with filter.

· Discard filter.

2. Put film of clean engine oil on seal of new filter.

3. Install new filter:

· Turn filter until seal contacts mounting surface.

· Then turn filter BY HAND 1/2 turn more.

4. Run engine to fill filter with oil and check for oil leaks.

5. Check oil level, add oil as required. (See Engine Oil in this section for correct oil.)

Cleaning And Gapping Spark Plug

c CAUTION: Avoid injury! Before you remove spark plug:

· STOP engine

· Let engine cool.


IMPORTANT: Avoid damage! DO NOT clean spark plug with abrasives.

Service Interval: Clean and gap spark plug every 100 hours of operation.

M86302

1. Clean area around spark plug.

2. Disconnect spark plug wire (A).

3. Remove and inspect spark plug:

· Clean plug and check for damage, replace if necessary.

· If plug is in good condition, check gap.

M85200

4. Check and adjust spark plug gap (B):

· 0.76 mm (0.030 in.)

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

6. Install spark plug wire.

Adjusting Carburetor

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

NOTE: 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.

NOTE: Possible engine surging will occur at high rpm when the transmission is in neutral ("N") and the PTO switch is in the OFF position. This is a normal condition due to the emission control system.

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

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

Checking And Cleaning Air Cleaner

Service Interval:

· Operating in dusty conditions may require daily maintenance.

· Clean foam element every 25 hours of operation.

· Clean or replace paper element every 100 hours of operation.

M85240

1. Remove two bolts (A) and air cleaner cover (B).

2. Foam element (C) - Clean every 25 hours of operation:

· Wash in detergent and water.

· Dry thoroughly.

· Saturate in clean engine oil and squeeze out excess.

85241

3. Paper element (D) - Clean or replace every 100 hours of operation:

· If paper element is dirty, tap gently on your hand to remove dust.

· If paper element is extremely dirty, install new element.

4. Install cleaner cover and fasten with two bolts

Replacing Fuel Filter

c CAUTION: Avoid injury!

Keep cigarettes, sparks, and flames away from the fuel system. Make sure engine is cool to the touch.

Service Interval:

· Operating in dirty conditions may require more maintenance.

· Replace fuel filter every 100 hours of operation or annually.

M85279

1. Park tractor on a level surface.

2. Let engine cool.

3. Turn fuel shut-off valve (A) to the CLOSED (OFF) position. (See Fuel Shut-Off Valve in Operating section.)

4. Slide hose clamps (C) away from filter (B).

M86303

5. Place a drain pan under hoses to catch any fuel that maybe left in the hoses.

6. Disconnect hoses from filter.

7. Install new filter. Be sure filter is located with arrow pointing in direction of fuel flow.

8. Connect hoses to new filter.

9. Install clamps.

10. Turn fuel shut-off valve (A) to the OPEN (ON) position. (See Fuel Shut-Off Valve in Operating section.)

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