What kind of hydraulic oil does John Deere use? An exclusive formulation, specifically designed to protect John Deere transmissions, final drives and hydraulic systems. Low Viscosity Hy-Gard Hydraulic and Transmission Oil, 32 oz. What weight is John Deere low viscosity HY Gard? Petro-Canada Lubricants notes that the key difference between JDM J20A (which is replaced by the current JDM J20C or JDM 20D specification) is the addition of the Alli- son C-4 seal, oxidation, wear and frictional characteristics test requirements - a fact that is not commonly known. What is the difference between J20A and J20C hydraulic fluid? Definitely think it could by ATF or some other low vis hydrostatic fluid. Not sure about the earlier 303 type hydraulic oil but that would have been in steel buckets I imagine. Yep never remember Hy guard or low viscosity Hy guard being reddish in color for as long as I can remember. To avoid any negative elements of performance or wear, it’s always best to use the type of hydraulic fluid which has been designed for these specific machines. You might think that almost any hydraulic fluid would be acceptable for use in your John Deere tractor.
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