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Welcome from Preston County, West Virginia

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Jeff, Not really an east project and definitely gonna be messy! The piece shown in your photo is a nut. Leave the cylinder attached and use a spanner type pin wrench...a pin fits into the hole in your photo. Standard right hand thread. A whack or 2 on the wrench will break it loose. When the nut comes out of the cylinder, it may be followed by oil...depending which way cylinder is (retracted/extended) you may get a LOT of oil (retracted) or a little oil (extended). Next, detach rod end and pull rod & piston out of cylinder...MORE oil! Now, remove nut on bottom of piston and remove piston. Nut can now be slid from rod and seal replaced. Hopefully your seal kit will have piston packings too...a good time to replace them! After you put the piston back on the rod, you need to tighten the piston nut tight, REAL tight! I'd suggest attaching rod end to tractor and pulling with all you've got on that nut. There're may be a torque spec, not sure, but it will be around 400 ft-lbs or more!

On reasm, a radiator clamp can be useful to collapse the seal on the piston so it can be more easily slipped into cylinder. Be VERY CAREFUL here NOT to nick or damage the piston seal! Hope this helps! Bob
 
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