NF hydro lift cylinder rebuild ?
 

Hey guys I am having a problem with my cylinder sinking pretty fast while in neutral position but my reservoir always seems to be full. Not sure the problem but am thinking I am going to rebuild the cylinder anyway. Are there special seals I will need to get or are they just ordinary O-rings that would be in an assortment pack? Would like to have all parts on hand before I start the project. Any help pointing me in the right direction would be appreciated!! Thanks in advanced!

Need more info, what tractor are you working on ? They made a lot of different size cylinders over the years. Pics would also help. Problem could also be the valve leaking inside.

The Nf units are simple, should be four O rings, 3 # 29 and 1 of # 25. The parts list gives the size of them here.
http://www.partstree.com/parts/cub-c...related-parts/

Any decent hydraulic repair shop should have those seals.
Just take your cylinder apart and take it to them.
That way you will be assured of getting parts suitable for hydraulic service.
Parts for mine were about $5 and that included tax!