John Deere

OMM124509

Issue A9

F925 and F935 Front Mower

F925 Serial No. (150001 - )

F935 Serial No. (150001 - )

Introduction

Safety Signs

Controls

Operating

Lawn Care

Replacement Parts

Service Machine Safely

Service Intervals

Service Engine

Avoid Fumes

Engine Oil

Engine Oil (Continued)

Checking Engine Oil Level

Changing Engine Oil And Filter

Cleaning Air Intake Screen And Radiator

Checking Air Restriction Indicator

Service Cooling System Safely

Engine Coolant

Engine Coolant (Continued)

Checking Coolant Level

Draining Cooling System

Flushing Cooling System

Filling Cooling System

Fuel Filter And Sediment Bowl

Replacing Primary Element

Replacing Secondary Element

Bleeding Fuel System

Lubricating Engine Driveshaft

Replace/Adjust Fan Belt

Service Transmission

Service Steering & Brakes

Service Electrical

Service Miscellaneous

Troubleshooting

Storing Vehicle

Assembly

Specifications

Warranty

John Deere Quality Statement

Copyright© Deere & Company

All Manuals Close Window

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


TS1411

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

The following oil is preferred:

· John Deere TORQ-GARD SUPREME PLUS-50®

The following oils are also recommended:

· John Deere TORQ-GARD SUPREME®

· John Deere UNI-GARD

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

· API Service Classification CE

· API Service Classification CD

· CCMC Specification D5

· CCMC Specification D4

Engine Oil (Continued)

If John Deere TORQ-GARD SUPREME PLUS-50 engine oil and a John Deere oil filter are used, the oil and filter service interval may be extended by 50 hours.

If diesel fuel exceeding 0.5% sulfur content is used, reduce the service interval for engine oil and filter by 50%.

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

Checking Engine Oil Level

1. Park Front Mower on a level surface.

2. Check engine oil when oil is cold.

3. Lift hood.


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4. Remove dipstick (A). Wipe dipstick with a clean rag.

5. Install dipstick.

6. Remove dipstick. Check oil level on dipstick.


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7. Oil must be between FULL mark "H" and LOW mark "L" on dipstick.

8. If oil level is low, remove oil filler cap.

IMPORTANT: Avoid damage! If oil level is at or below "L" mark, DO NOT run engine.



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9. Add oil to bring oil level no higher then the "F" mark on dipstick. (See Engine Oil in this section for correct oil.)

10. Install dipstick.

11. Install and tighten oil filler cap.

12. Lower hood.

Changing Engine Oil
And Filter

1. Park Front Mower on a level surface.

2. Run engine a few minutes to
warm oil.

3. STOP engine.

4. Remove key.

5. ENGAGE service-park brake.


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6. Remove drain plug. Drain oil in pan.

7. While oil is draining, change oil filter.

8. Lift hood.


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9. Put a drain pan under filter (A).

10. Remove filter using a filter wrench. Turn filter counterclockwise.

11. Apply a film of clean engine oil
on seal of new filter.

12. Install filter. Turn filter until seal contacts mounting surface. Then turn filter BY HAND 1/2 turn more.

13. Install and tighten drain plug.

14. Remove filler cap. Add approximately 3.1 L (3.3 qt) of oil. (See Engine Oils in this section for correct oil.)


M39490


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15. Remove dipstick (B) to check
oil level. Add oil only to FULL mark "H" on dipstick.

16. Install filler cap.

NOTE: Mark "L" is low oil level
on dipstick.

17. Start engine and run at slow speed for 2 minutes. Check for leaks around filter and drain plug.

18. STOP engine. Check oil level.

19. Install dipstick. Lower hood.

Cleaning Air Intake Screen
And Radiator

1. Lift seat.


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2. Loosen three wing nuts to remove screen.


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3. Clean screen with a brush or compressed air.

4. Clean air intake screen and radiator cooling fins using compressed air or a brush.

5. Install screen.


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6. Tighten nuts.

Checking Air Restriction
Indicator


M78403

· DO NOT replace primary element unless air restriction indicator (A) shows 635 mm (25 in.) vacuum.

· DO NOT replace secondary element unless air restriction indicator shows 500 mm (20 in.) vacuum after primary element is replaced.

· It is normal for air restriction indicator to show at least 380 mm (15 in.) vacuum after primary element is replaced.

Service Cooling System Safely

c CAUTION: Avoid injury! Explosive release of fluids from pressurized cooling system can cause serious burns:

· Shut off engine.

· Only remove filler cap when radiator is cool enough to touch with bare hands. Slowly loosen cap to first stop to relieve pressure before removing completely.

Engine Coolant

Use ethylene glycol base coolant. Use coolants only designed for heavy duty diesel engines.

Check container label before using.

IMPORTANT: Avoid damage! To prevent engine damage, DO NOT use pure antifreeze or more than 50% antifreeze in the cooling system. DO NOT mix or add any other type additives to the cooling system.


Mix approximately 50 percent antifreeze with 50 percent distilled or deionized water. 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.

Engine Coolant (Continued)

The recommended antifreeze provides:

· Adequate heat transfer.

· Corrosion-resistant environment within the cooling system.

· Compatibility with cooling system hose and seal material.

· Protection during cold and hot weather operations.

Checking Coolant Level

c CAUTION: Avoid injury! To avoid personal injury:

· Do not remove radiator cap unless the engine is cool.

· Wrap hand with a rag.

· Turn cap slowly to the stop.

· Release all pressure before you remove cap.

IMPORTANT: Avoid damage! To prevent engine damage:

· DO NOT operate engine without coolant.

· DO NOT pour coolant into the radiator when the engine is hot.

· To prevent engine overheating, never exceed more than 50 percent antifreeze in cooling system.

· Cooling system capacity is 4.7 L
(5 U.S. qt.).


1. Lift hood.


M39491

2. Coolant level must be 25-51 mm (1-2 in) in recovery tank (A).

3. If coolant is low, remove coolant recovery tank cap.

4. Add 50 percent ethylene glycol (without stop-leak additive) antifreeze and 50 percent water to proper level.

5. Install and tighten coolant recovery tank cap.

6. Clean debris from air intake screen and radiator. (See Cleaning Air Intake Screen and Radiator in this section.)

7. Check condition of hoses. Check for leaks or loose connections.

Draining Cooling System

c CAUTION: Avoid injury! To prevent personal injury:

· Do not remove radiator cap unless engine is cool.

· Wrap hand with a rag.

· Turn cap slowly to the stop.

· Release call pressure before you remove cap.

1. STOP engine. Let engine cool.

2. Lift hood.

3. Slowly remove radiator cap.


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4. Open radiator petcock (A). Drain coolant into a bucket.


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5. Loosen block drain (B) one or two turns and drain coolant from engine block.

6. After all coolant has drained, close radiator petcock and tighten block drain.

7. Flush cooling system. (See Flushing Cooling System this section.)

Flushing Cooling System

c CAUTION: Avoid injury! Explosive release of fluids from pressurized cooling system can cause serious burns:

· Shut off engine.

· Only remove filler cap when cool enough to touch with bare hands.

· Slowly loosen cap to first stop to relieve all pressure before removing completely.

IMPORTANT: Avoid damage! To prevent engine damage, DO NOT pour water into a hot engine. DO NOT operate engine without coolant.



M39493

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 can.

2. Install and tighten radiator cap.

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

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

5. Close radiator petcock.


M39491

6. Remove and clean recover tank (A).

7. Install tank after cleaning.

8. Fill cooling system. (See Filling Cooling System this section.)

Filling Cooling System

IMPORTANT: Avoid damage! To prevent engine damage, DO NOT use straight antifreeze or more than 50% antifreeze in the cooling system. DO NOT mix or add any other type additives to the cooling system.


NOTE: F925: Cooling system capacity is 4.7 L (5 qt).
F935: Cooling system capacity is 4.7 L (5 qt).

1. For cold weather:

· Use a solution of only low silicate ethylene glycol antifreeze (without a stop-leak additive) and clean, soft water.

· A chart on the antifreeze container tells how much antifreeze to use for freeze protection needed in your area.

2. When operating engine in extremely cold temperatures:

· See your John Deere dealer for information on arctic operation.

3. For temperatures above freezing:

· Fill cooling system with clean, soft water and John Deere Engine Coolant Conditioner.

4. 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.

5. Install and tighten radiator cap.

6. Run engine until it reaches operating temperature.

7. STOP engine.

8. After engine cools, check coolant level in recovery tank. Level should be approximately 25-51 mm (1-2 in).

9. Remove cap to add coolant, if necessary.

10. Check condition of coolant system hoses.

11. Install new hoses, if necessary.

12. Tighten hose clamps, if necessary.

Fuel Filter And Sediment Bowl

Clean the sediment bowl and change the filter.

1. Turn fuel tank pointer to OFF.


M78403

2. Turn collar (A) counterclockwise to remove bowl and filter.

3. Clean bowl. Replace filter.

4. Bleed fuel system. (See Bleeding Fuel System in this section.)

Replacing Primary Element

IMPORTANT: Avoid damage! DO NOT clean primary element.

· DO NOT replace primary element unless air restriction indicator shows
635 mm (25 in).


1. STOP engine and lift hood.


M78404

2. Remove wing nut (A) and cover (B).


M62860

3. Remove and discard wing nut and washer (C).

4. Remove and discard old primary element (D).

5. Wipe dirt from inside of cannister with a soft cloth.

6. Install new primary element.

7. Install new wing nut and
washer.

8. Tighten wing nut.

9. Install old cover with washer and wing nut.

10. Tighten wing nut.

11. Depress reset button (E) on air restriction indicator (F) and then release to reset.

12. Start engine and allow it to run a minute at maximum speed.

13. STOP engine and check air restriction indicator. If indicator shows 500 mm (20 in) or more vacuum, replace secondary element.

Replacing Secondary Element

IMPORTANT: Avoid damage! DO NOT clean secondary element.

· Replace secondary element only every third primary element change.

· Every two years, OR

· When air restriction indicator shows
500 mm (20 in) vacuum after replacing primary element.


1. Remove primary element. (See Replacing Primary Element in this section.)


M62861

2. Remove wing nut (A) and secondary element (B).

3. Install new secondary element.

4. Install washer and wing nut.

5. Tighten wing nut

IMPORTANT: Avoid damage! It is normal for air restriction indicator to show at least 380 mm (15 in) vacuum, after primary element is replaced.



M78404

6. Install new primary element.
(See Replacing Primary Element this section.)

7. Install washer and wing nut.

8. Tighten wing nut.

9. Install cover (C).

10. Install wing nut (D).

11. Tighten wing nut.

12. Close hood.

Bleeding Fuel System

Serial Numbers (         -160000)

NOTE: When mower is run out of fuel, the air in the fuel system must be removed. Late model mowers are self bleeding, and will restart after a short period of cranking engine.

IMPORTANT: Avoid damage! Modification or alteration of the injection pump, the injection pump timing, or the fuel injectors in ways not recommended by the manufacturer will terminate the warranty. Do not attemp to service injection pump or fuel injectors yourself. Special training and special tools are required. See your John Deere dealer.


1. Fill fuel tank. Turn fuel supply lever towards side with full tank.


M78403

2. Loosen bleeder screw (A) a few turns to open air vent.

3. Turn key switch to run position to run fuel pump until fuel appears at bleeder screw, then turn key switch to off position.

4. Tighten bleeder screw.


M39498

5. Loosen bleeder screw (B) at fuel injection pump.

6. Turn key switch to run position to run fuel pump.

7. Run fuel pump until fuel appears
at bleeder screw, then turn key switch to off position.

8. Tighten bleeder screw.


M38343

9. Using a 17 mm wrench, loosen nuts on all three high pressure fuel lines while holding a backup wrench on the injector body.

10. Use starter to turn engine over.

11. When fuel appears at injectors, tighten injector nuts.

12. Start engine. If engine does not start, repeat bleed procedure.

Lubricating Engine Driveshaft


M38335

Lubricate U-Joint fitting (A) with
one or two shots of John Deere Multipurpose Grease or equivalent.

Replace/Adjust Fan Belt


M63130

1. Loosen cap screw (A).

2. Loosen fan belt by sliding alternator bracket (B) torwards engine.

3. Pull fan belt from alternator pulley.


M63131

4. Remove three cap screws (C) holding vibration dampener (D) to engine pulley (E).

5. Remove fan belt from engine pulley and pull up between vibration dampener and engine pulley.

6. Pull fan belt forward off of fan blades and remove from mower.

7. Installation is in the reverse of removal. First route fan belt over fan, then over engine pulley, then over alternator pulley.

8. Install vibration dampener cap screws and torque to specs.

9. Adjust fan belt tension. Belt should deflect 6 mm (1/4 in.) with light-to-moderate pressure at (F).

10. Tighten alternator bracket bolt (B).