Post hole digger motor

[lutt]

Good evening everyone. I am wanting to convert my 3 point post hole digger to use on my 420 loader on my 4200 deere. I was wandering what hydraulic motor I needed. I used the search, but didn't come up with much. I will be turning a 12 inch auger. I have a lot of holes to punch in a large upcoming fencing project in clay to clay gravel soil. So down pressure is going to be a God send. Pump flow is around 7 gallons a minute. Thanks guys! LUTT

 

[Fawken]

I hate to sound redundant, check the tech page at Surpluscenter.com. They list the required GPM for various motors and sell most all of them as well.

 

[lutt]

I have , there are a lot of folks on here that have put these together. That's why I am asking. I want to get it right the first time. Thanks LUTT

 

[MossRoad]

You'll need your tractor hydraulic's PSI and GPM and the RPM that you want the auger to turn at. Plug those numbers into the calculator at Surplus Center and it will tell you the Cubic Inch Displacement of the motor that you will need to achieve that.

 

[bigdeano]

Make sure the motor has enough torque to turn a 12" auger in your soil. That's the hard part to figure it seems to me. Sorry I can't help you.

 

[lutt]

Thanks, I am out on the lower Mississippi River at work, I'll have to research the rhino auger I have for the numbers. Motor mount and shaft size are something else I know I need to look into. THANKS LUTT

 

[Redneck in training]

It might be more cost effective to get down force kit for you three point PHD.
https://www.google.com/search?q=dow...ed=0CEEQyjc&ei=_EVcVZnFOMnZoASkoYGQBA#imgrc=_

 

[lutt]

That is something I should consider, didn't even cross my mind putting down pressure on it! THANKS! LUTT

 

[J_J]

Look through these PTO hyd motors and see if one will fit your tractor hyd.

Surplus Center

If you still need down force, there are kits for that..

6818-Danuser Down Force Kit For J20/80 Series 3 point PTO Auger

 

[lutt]

Look through these PTO hyd motors and see if one will fit your tractor hyd. Surplus Center If you still need down force, there are kits for that.. 6818-Danuser Down Force Kit For J20/80 Series 3 point PTO Auger

Thanks JJ I sure will!

 

[Piston]

I would also recommend a downforce kit for the 3 point hitch model.

I used a standard PHD to drill all the holes for quite a large fence a while ago. It didn't have down force and was a pain in the butt in my soil conditions.

Because of that, I bought a Landpride HD25 hydraulic auger to use on my FEL so I could have down force.

I also wanted to be able to back the auger out by reversing direction, which I really like and have used on more than one occasion.

Ultimately I believe the "best" setup is a hydraulic PHD hooked up to the 3 point hitch with a down pressure kit.

 

[lutt]

Thanks Piston! LUTT

 

[dfkrug]

I am wanting to convert my 3 point post hole digger to use on my 420 loader on my
4200 deere. I was wandering what hydraulic motor I needed.

You want something like the Worksaver 714H. I have installed that unit on a JD 955, but on the
backhoe, not the loader. Worked great. Having better control, down-force, and reversing
make this approach SO much nicer than a PTO PHD.

I have also built one from components, copying the 714H fairly closely.

If you are designing from scratch, you can go with direct-drive, or gearbox drive, like
the 714H uses. Direct-drive is simpler, but the drive unit is longer which limits
clearance, and a BIG hyd motor will be needed to slow the speed down. About 20
cubic inches! $$$$!

If you use an angle gearbox, then you have more clearance, you get more
torque, and you can buy only a 7ci motor. The 714H (and my PHD) uses
a 3.18-to-one gearbox which triples the torque.

BTW, a 12" auger bit is huge: I hope your soil is soft.

 

[lutt]

You want something like the Worksaver 714H. I have installed that unit on a JD 955, but on the backhoe, not the loader. Worked great. Having better control, down-force, and reversing make this approach SO much nicer than a PTO PHD. I have also built one from components, copying the 714H fairly closely. If you are designing from scratch, you can go with direct-drive, or gearbox drive, like the 714H uses. Direct-drive is simpler, but the drive unit is longer which limits clearance, and a BIG hyd motor will be needed to slow the speed down. About 20 cubic inches! $$$$! If you use an angle gearbox, then you have more clearance, you get more torque, and you can buy only a 7ci motor. The 714H (and my PHD) uses a 3.18-to-one gearbox which triples the torque. BTW, a 12" auger bit is huge: I hope your soil is soft.

Yes sir, that is what I was planning on doing, building from scratch and putting on my loader. Lot of things to consider here. I have been using it on the three point quit a bit. With all the rain we are getting this year, it may not wind up being a issue! Thanks LUTT