Righty Tighty Lefty Loosey
Big nut on back of the wheel, turn towards the left, (counter clockwise).
Nut should come off.
Well Greases wheel hub should then slide off the shaft.
Simple!
Bad mojo abounds so:
Nut wont come off: use a propane torch to heat it (JUST THE NUT).
Nut comes off but the hub is stuck to the shaft: Heat just the wheel hub with a torch for a while, it may be grease has turned to varnish. Pull gently on spokes close to hub by hand (Gently!)
Hub still stuck: Attach a three jaw puller to the hub only, not the spokes, heat the hub really well for about 30-45 minutes with a propane torch. (Or less with something more powerful, although that will tend to discolor the hub, and I would not recommend it). Slowly and evenly tighten the thee jaw puller until the wheel hub begins to move, constantly heating as you go along.
Hub still stuck, apply Kroil every day for 4 days followed by heating the hub with torch then apply more Kroil (
http://www.amazon.com/Kano-Aerokroi...?ie=UTF8&qid=1414079796&sr=8-1&keywords=kroil) at end of 4 days Apply more Kroil, attach three jaw puller to the hub, heat with torch very hot, try to remove hub with puller. If the wheel hub is still not moving tighten the three jaw puller as much as is advisable and apply repeated blows to the end of the three jaw puller screw with a large heavy plastic (not rubber) or better yet a rawhide mallet. Don't be a sissy either really hit it. Tighten three jaw puller and repeat. This creates shock and shock loads to the hub, which help break up and corrosion.
Now I have only ever found one boat that these series of steps didn't work on. We found a replacement wheel (Yacht Specialities), and cut the hub in half with a die grinder. Some fool had pounded it on with an aluminum key back in the day, we had an aluminum, bronze, SS battery that effectively had welded everything together. Cleaned it up, took the shaft out of the pedestal threw it on a lathe for clean and true (And to address the very tip of the shaft we had been pounding on through the three jaw puller), greased it liberally, used a bronze key and put the new to the owner wheel on.
Guy