I FINALLY used this thing after letting it sit around taking up space for years.
During the testing phase I kept burning up belts in no time. I worked on a belt tensioner but never got it quite right. I converted it to chain drive, and set up a chain tensioner and that worked much better. I had an old rusty 3 point hitch spreader that I bought for $25, guessing I could use the frame and gearbox later for a project. I stripped the 3ph frame, and set this thing up to use behind my tractor. I trenched in about 500' with it and am very happy for the amount I've spent on it. Once this current irrigation project is done, I want to strip the motor and use the gearbox I have to convert it to PTO drive.
These pictures are from the testing phase. I've since replaced the straps with steel cable and turnbuckles. Now that I'm done (for now) with the irrigation I wanted to run, I want to fabricate a chain guard, spend some time on grinding and paint. It trenches about 3 1/2 in he's wide the way I have the teeth set now, and 8" deep. Here in SC that's all any of my existing irrigation was trenched and it's been there 30+ years.
When I work on converting it to PTO drive, I am kicking around the idea of making a larger cutting disc to extend the cutting depth to 10 or 12 inches. That's the difference between the 8" and 12" trenchers from Little Beaver. A larger cutting disc and more HP.