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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

Hydraulic lift piston washer - confused

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tom888fish

08-24-2014 02:58:24
50.133.152.112



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Rebuilding my 8N hydraulics and per advice on here, I ordered a new style piston NAA530B it recommended O-Ring NAA533A and back up washer NAA473A, both of which I ordered. So I think I have everything. However, now I'm confused I have two O-rings with one slightly thicker than the other. I've got a black leather ring and a separate ring that seems like its not leather, but something man-made and black on one side. How does all this go on the piston? One of the posts on hydraulics here mentioned "Install the CNH neoprene washer w/ the concave side toward the O ring." which doesn't seem to describe what I have. Help!

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TheOldHokie

08-24-2014 05:22:39
71.176.182.141



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 Re: Hydraulic lift piston washer - confused in reply to tom888fish, 08-24-2014 02:58:24  
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Backup rings are available in flat and contour designs. Contour designs tend to work a bit better but either will work satisfactorily in your application. You should be using one o-ring and one backup-ring. The backup ring is placed opposite the pressure side of the o-ring.

TOH



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soundguy

08-24-2014 15:36:50
107.77.68.56



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 Re: Hydraulic lift piston washer - confused in reply to TheOldHokie, 08-24-2014 05:22:39  
To go along with that, over the years in ordering backup rings I have received 3 different styles.

Tan leather, smooth and less smooth sides

Grey leather, less smooth side and smooth side faced with shiney black rubber? ( nitrile?)

Both of those were flat

Have also got the cup shaped rubber ones



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tom888fish

08-24-2014 05:43:30
50.133.152.112



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 Re: Hydraulic lift piston washer - confused in reply to TheOldHokie, 08-24-2014 05:22:39  
Thanks THO!!



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R Geiger

08-24-2014 07:12:51
50.38.94.127



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 Re: Hydraulic lift piston washer - confused in reply to tom888fish, 08-24-2014 05:43:30  
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Make sure the bore is bright and polished. any scoring or roughness will tear up the o ring. O rings like a mirror finish.



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tom888fish

08-24-2014 15:31:09
50.133.152.112



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 Re: Hydraulic lift piston washer - confused in reply to R Geiger, 08-24-2014 07:12:51  
Borrowing a cylinder hone tomorrow to make sure its polished. Definitely some pitting, scoring, etc.



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