What did you use for the hydraulic motor?There are some hydraulic augers made for tractors that requires way less flow to work properly. With one of those units, I can only see it working great, specially because down pressure can be applied versus the 3 pt ones and can also be reversed.
I built one for my homemade backhoe, that uses the auxiliary circuit with 4 GPM and works great.
Just a 200 CC Danfoss hydraulic motor. Straight to the auger, which I don't recommend, but I did it anyway at my own risk. It definitely needs a bearing support to take the axial load of the motor.What did you use for the hydraulic motor?
Can you be a little more descriptive of “doesn’t work well”. Must not have been horrible if he loved it and you are planning on using it for even bigger holes. Was it just slow, or did you need to resort to hand work?My little micro mini excavator came with one when I bought it. The excavator is only 19hp so cant have that much hydraulic flow but my father loved it for putting in 8in holes for a split rail fence a few weeks ago. Dosnt work well in rocky/root clay like we have but at least you have down pressure and reverse. I'm going to put 12in holes in for a wood shed in a few days. I have the same terrible shale/clay soil.
Dosnt work well meaning the type of 8in auger( for 4in posts) I have is a double flight and would move off rocks it couldn't pick up. Meaning lots of rock removal by hand and hole adjustment by hand. He said he would have came and got my 12in auger if he knew I had it. Lol. I guess this falls into the category or operator error or get a way bigger auger than you think you need.Can you be a little more descriptive of “doesn’t work well”. Must not have been horrible if he loved it and you are planning on using it for even bigger holes. Was it just slow, or did you need to resort to hand work?