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Service Transmission


Transmission and Hydraulic Oil

IMPORTANT: Avoid damage! Use recommended oil only. Do not use engine oil or “Type F” automatic transmission fluid.




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

Standard John Deere J20C HY-GARD Transmission/Hydraulic Oil is recommended. John Deere J20D Low Viscosity HY-GARD® Transmission/Hydraulic Oil may also be used.

Other oils may be used if they meet John Deere standard JDM J20C or J20D.

Checking Hydrostatic Drive Oil Level

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

2. Lower cutting units to the ground.

3. Stop the engine.

4. Check oil level when oil is cold.


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5. Pull dipstick (A) out to check oil level.

6. If oil level is low, add John Deere HY-GARD oil or an equivalent.

Changing Hydrostatic Drive Oil

c CAUTION: Avoid injury!

Use caution when filling and draining hydraulic oil. During periods of machine operation the hydraulic oil can get hot. Allow engine and oil to cool before servicing.

IMPORTANT: Avoid damage! Clean area around plugs before removing to prevent dirt and other contaminants from entering oil reservoir.

Do not overfill.


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

NOTE: Drain plug is located left rear of machine below fuel tank.


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2. Remove plug (A) and drain oil into a drain pan with at least a 6 gal capacity.

3. Install plug.

4. Fill reservoir with approximately 20.8 L (5.5 gal) of oil. Use John Deere HY-GARD oil or an equivalent oil meeting John Deere specifications.

5. Start the engine. Cycle hydraulic control for 1 or 2 minutes.

6. Stop the engine and check oil level. Add oil as necessary. (See Checking Hydraulic Oil Level).

Replacing Hydrostatic Drive Oil Filter

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


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2. Turn hydraulic oil filter (A) to the left (counterclockwise) to remove. Use drain pan to catch dripping oil.

3. Put a film of clean oil on seal of new filter.

4. Tighten filter until it contacts mounting surface. Tighten filter one full turn after gasket contact. A filter wrench may be required.

5. Start the engine and check for leaks.

6. Stop engine and check oil level. Add oil as necessary.