I have this attached to an electric motor instead of gas. Been using it for nearly 20 yrs and it's worked fine. It's worked well despite the concrete that goes for 'soil' here. Mostly red clay and small/med/large smooth river stones.
I was tilling up a new bed for Spring, when the tiller stopped rotating. Upon disassembly, I found the "driver", part number 791-180152, which is nylon and accepts a square spring-driveshaft, had been stripped out round due to use.
I took it to my favorite mower shop, they found the above part in their manual, but said it was discontinued. They checked a few of their regular parts sites and no joy.
So I brought it home and tried to think of a way to return the round hole back to square. Finally settled on drilling four holes at 90° from each other, threading in 8x32 screws, then slicing off the excess with a MotoTool. It worked for awhile before failing. Perhaps I need 8 screws (2 per flat side) to absorb the torque?
Evidently it was slipping quite a bit because when I fixed it and fired it up, it was really spinning like mad, even on LOW.
I'll post a picture of the 'driver' later. I might have to machine a new one out of nylon, delrin or even aluminum on my mini-lathe. Was also considering using JB weld to permanetly join the two parts. Any ideas/suggestions? Thanks.
1998 Volvo V70 T5 212,455 mi. Original Owner.