I picked up a Yanmar RS 1200 tiller for my Kubota B7100 the other day. It's a 48" wide, shaft-driven tiller, that uses a standard 1 3/8" x 6 spline coupling. These were made both in a proprietary 2 point configuration, and a 3 point configuration.
Mine is a 3 point, but a previous owner still had to extend the bracket for the lift arm pins about 4". The PTO shaft for it is too long for my 'Bota... the shaft is 28" end to end, and my Kubota needs something about 22" long. The old shaft is a splined slip yoke like an automotive drive shaft, not a 3-sided telescoping shaft like most tractor PTO Shafts. It has been shortened by a previous owner, who didn't get the joints phased very well. I didn't feel comfortable trying to shorten this one on my own.
A local shop wanted $95 to shorten and balance it, but I found a new one for $70 at a Case dealer that's going out of business...
So, my biggest question is...
If I shorten the new PTO shaft to 22", there will only be 18 inches center to center on the U-joint yokes. There's enough room for the shafts to extend and collapse without coming apart, I'm just worried that the shaft will be too short and put a lot of stress on the U-joints, tiller input shaft, and the tractor PTO.
Does this sound like it's too short; do I need to find another solution rather than shortening the shaft (like lengthening the bracket for the lift arm pins?)
Thanks for any input you may have.