david brown 990 Ram Cylinder


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david brown 990 Ram Cylinder

Mike I have a 1963 DB 990. The 3 point hitch recently lost all it's lifting power. I've disassembled the ram cylinder and found that there is one O-ring in the piston groove. The O-ring is worn smaller than the piston diameter. I figure that is why the 3pt has no strength.

In the ITC manual I have, it calls out the O-ring as "Piston ring, O-ring, and leather backup ring".

Is there supposed to me more than just an o-ring? If so how do I go about getting the Piston ring and leather backup ring? There is no specification in the book for any of these items, no )-ring specificaiton either.

Any help would be appreciated.

Mike

AJ Mike, First off I am not faimilar with the cylinder you have but on the other hand have resealed hundred of others,the seal on the piston is what I think you are talking about,some of the seals can be a square rubber ring and outside that and on top of it fits a flat leather ring,if you got that type the two rings usually come together,it is most important when fitting the rubber ring that it does not get twisted as you put it in the groove,sometimes you have to soak the leather one in hot water to get it over the piston,some of the newer ones have a Z shape cut in them to let them expand a bit to go over the piston,you will need to squeeze the leather ring into the groove to get the piston into the cylinder.
AJ

AJ Mike forgot to mention above that the leather ring is often gone missing,it does no harm as its soft.
AJ

Mike Thanks AJ! That last bit of information regarding the the leather ring wearing away answers most of my questions. I went to Tractor supply and found an O-ring that fits and seals the piston well, but I think I'll see if I can track down a square ring with the leather casing before I start re-assembling the tractor this weekend.

Incedently, I ran across a website that was very helpful. There are 2 pages of cross sections of piston seals and rod seals that illustrate what you are saying very clearly.

http://www.epm.com/pack_app1.htm

Thanks again for your help and the installation tips,
Mike

AJ Glad I was of some use and thanks for the link,you may as well get the two piece seal as the o'ring will wear out.
AJ

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