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Farmall 560 O-ring swelling in valve stack


 
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garr806
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PostPosted: Sun Oct 21, 2018 12:58 pm    Post subject: Farmall 560 O-ring swelling in valve stack Reply to specific post Reply with quote

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.
 
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fastfarmall
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PostPosted: Sun Oct 21, 2018 2:44 pm    Post subject: Re: Farmall 560 O-ring swelling in valve stack Reply to specific post Reply with quote

And it's Hy - Tran brand hyd fluid ?
 
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garr806
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PostPosted: Sun Oct 21, 2018 4:36 pm    Post subject: Re: Farmall 560 O-ring swelling in valve stack Reply to specific post Reply with quote

Yes the oil I am using meets the specifications what it recommends for the 560
 
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fastfarmall
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PostPosted: Sun Oct 21, 2018 4:58 pm    Post subject: Re: Farmall 560 O-ring swelling in valve stack Reply to specific post Reply with quote

Don't know what to say,but they are not compatiable !
 
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KL in Wi
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PostPosted: Mon Oct 22, 2018 3:42 am    Post subject: Re: Farmall 560 O-ring swelling in valve stack Reply to specific post Reply with quote

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.
 
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garr806
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PostPosted: Mon Oct 22, 2018 12:23 pm    Post subject: Re: Farmall 560 O-ring swelling in valve stack Reply to specific post Reply with quote

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.
 
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