Do a search in search for axle hub problems B7100 butch posted a good fix or you can do like dust-y and purchase the replacement hubs made out of a better grade cast. I saw some of these on ebay a few days ago. Butch fix sound good to me--------------------------------------------------------------------------------
My first tractor was a used B7100. It had been abused and the hubs AND axles were worn significantly. I used an old well drillers trick and bought sheets of various thickness brass shim stock. It took the rim off the hub and then removed the hub from the axle. This is what I did in 1985 and my son has the tractor now and the fix is still working GREAT! (I maintain it for him)
First make sure you mark the axle and hub with punch marks to put reinstall it as it was taken off in the worn state. Also make sure the the compression bolt is loose and the hub slides easily on and off the axle. The punch marks also get you close to where the pin goes through the hub and axle... its gotta line up in the end.
I first started with the thickest shim stock that could be wrapped around the axle and still get the hub on even if it took a little persuasion. You want to start with the hub snug on the axle.
The next thing I did was examine the wear locations on each hex side on the axle for wear and as thought the hex sides wore uneven. With the hub and initial wrap around shim in place I carefully cut and inserted various shim thicknesses to fill the voids betwee the axle and wraparound shim watching to get the hub as close to center as possible.
This takes a while but when I disassembled the fitted hub, axle and shims and fitted the shim "assembly" on the axle holding the cut shims under the wraparound shim with grease and then held the wrap around shim in place with a piece of copper wire around it.... it left my hands free to install the hub.
I greased the hell out of the hub and carefully drove the hub over the wrap around shim. It was as tight as a mouse's ear! I was very pleased to see how centered the wheel was as I put the tractor on jack stands an ran the rears in low and high gear checking for "out of round".
Worked for me and still does for my son.
Got it to copy for you TRAILDUST taught me how to do that.THIS IS HOW BUTCH FIXED HIS .handy
