Hydraulic Oil ???

[bighamlin]

I have four JD's, 1960 - 1970, and all call for a different hydraulic oil. My 1010 crawler calls for 10w or 5w-20 and my 2510 & 4020 tractors call for JD special type 303. While my 544 uses both 303 and type C-2, but the manual says not to use 303 in place of the C-2. My question, does anyone know if Hygard, which is what I have been using, will cause any difference in preformance for any of these applications? My Deere dealer says the Hygard is a replacement for all of the above, but I believe I must be sacrificing something with a one oil replacement.

Thanks
Paul

[Lavoy]

You must run the Hygard or equivalent in the 2510 and 4020. If you run it in the crawler you will lose a little pressure compared to a straight hyd oil, but won't hurt anything.
Not sure on the 544 though, I do not know what C2 is.
Lavoy

[bighamlin]

Lavoy, Deere makes a low viscosity hygard, would that work better than regular hygard in the crawler? Or, does Deere make a "straight hydraulic oil"?

The C-2 is an oil designation of the Allison transmission, hydraulic steering and brakes on the JD544, the loader cylinders have a seperate resevior and pump for the 303/now hygard.

Thanks
Paul

[Lavoy]

The low vis Hygard will make it squeal worse, it is enough thinner. It won't hurt anything, but you will lose some more pressure.
Deere does not make a straight hyd oil anymore that I know of. It is not hard to find though, any Farm and Fleet or TSC type store will have it on the shelf. I think the Advance Auto parts store in town even has it.
Talk to your local dealer, they may tell you that the low vis is a substitute for the C2.
Lavoy