I've been struggling to get a tiller going on my HT20D. The instructions say to "depress lock collar on tiller drive shaft and slide drive shaft onto the rear PTO shaft far enough to allow opposite end to slide onto tiller input shaft. After drive shaft is installed onto tiller input shaft, slide drive shaft back until collar locks into groove in PTO shaft."
My collar does not lock into that groove. Well it kind of does if I work it in there, but if I make a few revolutions by hand it works itself loose. I worked and worked at it and finally got it to where it felt pretty solid, tilled four feet and it came off.
I am attaching some pictures of the driveshaft end and the collar. Is this what it's supposed to look like? Is it worn out? I can't really figure out how it's designed to work. The collar has two pins on the inside and one of them has a kind of spring mechanism. Is that spring supposed to push back enough that it pulls the opposite edge of the collar into the groove?
I tried putting a snap ring in the groove on the tractor's PTO shaft but the collar apparently worked its way over it.
Any and all help is most appreciated! I'd really like to get this tiller going. Successfully getting this HT20D to be a loader and tiller tractor would be the end of a long and winding journey!