Farmall 560 O-ring swelling in valve stack

garr806 · Oct 21, 2018

Having a issue with O-rings that I been replacing between the hydraulic valve stack. Over time they swell up and leak. I am getting the O-rings straight from Case IH dealer. The old part number is 350667R1 and the new number is 75285739. I thought hydraulic oil was contaminated. I flushed several times and has new clean oil. I am stumped with this one.

fastfarmall · Oct 21, 2018

And it's Hy - Tran brand hyd fluid ?

garr806 · Oct 21, 2018

Yes the oil I am using meets the specifications what it recommends for the 560

fastfarmall · Oct 21, 2018

Don't know what to say,but they are not compatiable !

KL in Wi · Oct 22, 2018

Are they actual Case-IH orings or is your dealer buying some cheap o-rings from some other source and they aren't compatable? Maybe try getting some at a hyd shop.

garr806 · Oct 22, 2018

It is Hy-Tran. But what I don't understand is is that the only O-rings that swell are the blue O-rings none of the other black O-rings I have gotten from the dealer don't swell at all.

Farmall 560 O-ring swelling in valve stack

garr806

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fastfarmall

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garr806

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fastfarmall

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KL in Wi

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garr806

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