The proper viscosity allows it to work effectively, flowing readily through any part of the system. Hy-Gard retains proper viscosity over a wide range of operating temperatures thanks to its polymeric viscosity improver. If it was me, I'd wait until I could get to the JD dealer and buy some Hy-Gard so I'd sleep better at night. This is the equivalent to John Deere J20D oil. to maintain your warranty unless they provide it free of charge.Ĭhances are if you bought some Cub Cadet or Sears low viscosity tranny fluid, it would be fine since they use TuffTorq trannies in some of their models also. Under federal law, a manufacturer cannot require you to use their oil, etc. Sounds like JD black magic to me - a magical way to make sure you buy their high dollar tranny fluid. If it did, then it would be easy to figure out if there was a good substitute. I looked on the bottle of Hy-Gard I have, and it doesn't say anything about any standards (like you would see with motor oil such as 'SJ'). I don't know enough about oils to say whether there is an appropriate substitute. Its components are almost the same as John Deere Hy Gard. It may be used in all operating temperatures.' You need is to consider the ambient air temperature you will encounter again according to my manual reg. It is high quality, multifunctional tractor hydraulic fluid.

John Deere Low Viscosity HY_GARD (J20D) transmission oil is specially formulated to provide maximum protection against mechanical wear, corrosion, and foaming. Do not use type 'F' automatic transmission fluid. Use only Low Viscosity HY-GARD (J20D) transmission oil. This machine is equipped with an internal wet disc brake transmission. 'Use John Deere Low Viscosity HY-GARD (J20D) transmission oil to reduce transmission noise. I have a 2001 GT235 with the K71 transmission, and here's what the manual says:

John deere hy gard low viscosity