John Deere

OMM139226

Issue A9

Compact Utility Tractor with Gear Transmission

790 Serial No. (190064 - )

Introduction

Safety Signs

Controls

Operating

Replacement Parts

Service Machine Safely

Service Intervals

Service Engine

Service Transmission

Checking The Front Axle Oil Level

Changing the Front Axle Oil

Transmission and Hydraulic Oil

Checking Transmission Oil Level

Changing Transmission Oil and Filter

Service Electrical

Service Miscellaneous

Troubleshooting

Storing Machine

Assembly

Specifications

Warranty

John Deere Service Literature

John Deere Quality Statement

All Manuals Close Window

Service Transmission


Checking The Front Axle Oil Level

Service Interval: Visually check front axle oil level every 50 hours.

IMPORTANT: Avoid damage! Allow front axle oil time to cool before checking level.


1. Park tractor on level surface. Engage park brake.

2. Lower attachments and stop engine.

3. Unscrew dipstick (A) located inside right front wheel and remove it from axle.


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4. Wipe dipstick dry, insert dipstick into axle hole but DO NOT screw it into the axle case. Remove dipstick.

5. Oil level should be to top mark (B) on dipstick.


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6. If oil level is low, pour oil into the dipstick opening. Use John Deere API GL-5 Gear Oil or its equivalent.

7. Allow oil at least one hour to settle. Oil level should be to the top mark (B) on the dipstick.

8. Install and tighten dipstick. Check again after the first several hours of operation.

Changing the Front Axle Oil

Service Interval: Change front axle oil every 500 hours.

1. Park tractor on level surface. Engage park brake.

2. Lower attachments and stop engine.

NOTE: For draining purposes there are approximately 2.3 L (2.25 qts) of oil in the front axle. Drain oil immediately after operating tractor, when oil is still warm. It may be necessary to remove front wheels for access to vent plugs (A).

3. Remove vent plug (A) from both sides of front axle.

4. Remove drain plug (B) from both sides of front axle. Drain oil into suitable container.

5. Remove differential drain plug (C) from front axle. Drain oil into suitable container.


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6. Install and tighten three drain plugs (B and C) after all oil is drained.

7. Remove dipstick (D).

8. Add approximately 2.3 L (2.25 qts) of John Deere API GL-5 Gear Oil or its equivalent through dipstick opening.

IMPORTANT: Avoid damage! Allow oil one hour to settle before checking level. Recheck oil level after several hours of operation.


9. Insert dipstick (D). Do not screw dipstick into case to check oil level. Pull it out.


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10. Oil level should be to the top of the XX area (E) on the dipstick.


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11. If oil level is low, add oil through the dipstick opening.

12. Install and tighten the dipstick.

13. Install both vent plugs.

14. Install front wheels if they were removed.

15. Tighten front wheel bolts to 133 Nm (98lb-ft).

Transmission and Hydraulic Oil

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

The following John Deere transmission and hydraulic oil is PREFERRED:

Low Viscosity HY-GARD (JDM J20D)

The following John Deere oil is also recommended if preferred oil is not available:

HY-GARD (JDM J20C)

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

John Deere Standard JDM J20D

John Deere Standard JDM J20C

IMPORTANT: Avoid damage! You can mix Low Viscosity HY-GARD and HY-GARD. DO NOT mix any other oils in this transmission. DO NOT use engine oil or "Type F" (Red) Automatic Transmission Fluid.



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Checking Transmission Oil Level

Service Interval: Visually check gear transmission oil level every 10 hours of operation or daily.

1. Park tractor on level surface. Engage park brake.

2. Lower attachments and stop engine. Allow time for transmission oil to cool. Transmission oil must be cold to get an accurate reading.

3. Remove dipstick (A) located behind seat. Wipe dipstick with a clean rag. Install dipstick and then remove to check oil level.


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4. Oil level should be up to top mark (B). Add oil if necessary.


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IMPORTANT: Avoid damage! DO NOT overfill transmission. Oil expands during operation and could overflow.


5. Add Low Viscosity HY-GARD (JDM J20D) or equivalent.

Changing Transmission Oil and Filter

Service Interval: Change transmission oil every 500 hours of operation.

IMPORTANT: Avoid damage! Run machine a few minutes to warm oil.


1. Park tractor on level surface. Engage park brake.

2. Lower attachments and stop engine.

NOTE: For draining purposes there is approximately 15 L (4 gal) of oil in this transmission.

3. Remove transmission drain plug (A). Drain oil into suitable container.


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4. After oil is drained, remove cap screws (B) and housing (C) located on right side of transmission.


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5. Pull screen on inside of housing out. Clean screen in a safe solvent.

6. On tractors equipped with power steering, turn transmission oil filter (D) (located underneath left foot rest) counterclockwise, using a filter wrench, to remove it. Some oil may come out of filter and filter base during removal. Use a drain pan to prevent an oil spill. Discard old filter and replace with a new one.


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7. Put a film of clean transmission oil on seal of new filter.

8. Fill the filter 1/3 to 1/2 full with John Deere Low-Viscosity HY-GARD transmission and hydraulic oil.

9. Tighten the filter QUICKLY until it contacts the mounting surface. Tighten filter by hand an additional
1/2 turn.

10. Remove hose (E) attached to vent tube located behind seat.


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11. Turn vent tube (F) counterclockwise to remove. Remove vent tube and clean in a safe parts solvent.


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12. Reinstall vent tube, oil screen and cover, and transmission drain plug.

IMPORTANT: Avoid damage! Prevent contamination of hydraulic oil. Carefully clean around oil filler cap before opening.


13. Remove fill cap (G) located behind seat.

14. Add approximately 15 L (4 gal) of John Deere Low Viscosity HY-Gard transmission and hydraulic oil. Install and tighten fill plug.

15. Start engine and check for oil leaks around filter base and drain plug.

16. Stop engine.

17. Remove dipstick (H) located behind seat. Wipe dipstick with a clean rag. Install dipstick and then remove to check oil level.


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IMPORTANT: Avoid damage! DO NOT overfill transmission. Oil expands during operation and could overflow.


18. Oil level should be up to top mark (I). Add oil if necessary.


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