So i decided to mount the drill motor. I want to see if it has enough hydraulic power to actually drill a hole.
In order to do this I needed to build a coupler and slice a drill rod in half to make connections to my auger bit.
So I come up with some more junk laying around and weld it up.. I finally have a auger hanging off the motor. I did not build a bearing assembly that would prevent pressure from pushing up on the gear reduction from the bottom. I am up in the air on that and that will take at least 2 days to figure out.
My test hole went OK. I need to change up a few hydraulic lever controls. I need it to turn and move down and the same time.
The motor spins slow. As in about a 1/3 speed of what i would prefer. The machine has enough down pressure to pick the whole front end up in air. The motor does not stop spinning so the gear reduction must be a lot.
So it passes the "will it dig test" but I ran into several problems. The first problem is it pretzeled the 5/8 shear pin i put in the coupler. I was thinking it could shear if it bound up. It is not even close to strong enough. I switch that out to a hardened 7/8s bolt. To do this I had to take everything apart and redrill the holes with the mill.
The next issue i ran into is the tapered drill rods locked together so tight it took Me 2 hours to get them back apart. A 4' pipe wrench and 1000 lbs table and vice was not enough. I had to lock it down in the back of a forklift counter weight and use an excavator to push on the wrench.
I quickly came to realize that unscrewing the drill rods is a problem that I cant handle without some mechanical advantage.
I have been unsure of how to accomplish this task. Because there are 3 factors that need to be addressed. The lower drill rod needs to be held in place and supported so that it can not fall into the hole, it also needs to be locked down so that it does not spin. The middle drill rod needs to be unscrewed at the top side which will be 10' in the air and it needs to unscrew from the lower drill rod.
After much thought I decided to build a barn door style table that could clamp and hold the lower rod.
Then I decided to put hydraulics on a pipe wrench to be able to break the upper connection.
If your paying attention you will notice the wrench is up sidedown that tightens the connections...
The problem I have now is the drill stem connection which is 10' up in the air. Depending on which joint is the tightest, using the drill motor to unscrew the connections, the weaker connection will let go first. This could be the one at the motor or the connection at the table. If it lets go at the motor first I must unscrew the rod by hand which pisses me off because I wanted to use the motor hydraulics.
I have not worked through this issue yet.
I also need to figure out how to clean up the hoses. The machine has 20 different hydraulic functions so hoses are everywhere.
Left out rigger up / down
Right out rigger up/ down
Hydraulic winch in/ out
Mast tilt up /down
Motor up / down
Drill direction left/ right
Hydraulic wrench in /out
Push blade up / down
Push blade tilt left /right
Push blade angle left / right

Last picture is some photos of some different pipe hold ideas i was looking at.