JJ and others - Post Hole Digger

woodlandfarms · Nov 20, 2008

I have been in the attachments section with a Post Hole digger question. Now it comes back to the PT.

In my design, I sense that it would be a good idea to be able to reverse the PHD. My initial plan was to run it off of the PTO circuit, but now I wonder if I should run it off of the clamping circuit.

Probably not, as I doubt there is enough GPM in that circuit. I am thinking of maybe an electronic switch but man, that is just more junk to wire...

In more train of thought stuff. I guess I could put the switch on the Tractor side. This poses the Oops question if I were to attach my mower or other device, would I wreck the device if it ran backward for a moment?

ponytug · Nov 20, 2008

Dear Carl,

You need the HP from the PTO circuit. You would die of boredom waiting for it to bore a hole from any other circuit.

Reversibility is a great thing. Just ensure that the motor can take it. Some of the PT motors can't. For my 1445, I specifically asked Terry about it with respect to the 72" tiller and brush cutters, neither of which can tolerate it. He said that he did make a couple special one offs for people that wanted it, but that generally you would break the motor running them the wrong way. Some of the non-PT models have much higher HP/torque motors and nice features like replaceable carbide teeth. Since your 1850 was designed as a slope mower, it has lots of hydraulic horsepower to power these units. i.e. think skidsteer...

Originally, I had been concerned about reversing the PTO, specifically the tiller jamming, but it hasn't been an issue for me. The few times that a rock has jammed it, I have been able to clear it in seconds, by turning the PTO off, and dragging the tiller backward for 4-6".

If you are planning on using it for posts, you might want to install a large angle meter or bubble level where you can see it from the driver's seat to keep your holes straight.

All the best,

Peter

woodlandfarms said:
I have been in the attachments section with a Post Hole digger question. Now it comes back to the PT.

In my design, I sense that it would be a good idea to be able to reverse the PHD. My initial plan was to run it off of the PTO circuit, but now I wonder if I should run it off of the clamping circuit.

Probably not, as I doubt there is enough GPM in that circuit. I am thinking of maybe an electronic switch but man, that is just more junk to wire...

In more train of thought stuff. I guess I could put the switch on the Tractor side. This poses the Oops question if I were to attach my mower or other device, would I wreck the device if it ran backward for a moment?

J_J · Nov 20, 2008

woodlandfarms said:
I have been in the attachments section with a Post Hole digger question. Now it comes back to the PT.

In my design, I sense that it would be a good idea to be able to reverse the PHD. My initial plan was to run it off of the PTO circuit, but now I wonder if I should run it off of the clamping circuit.

Probably not, as I doubt there is enough GPM in that circuit. I am thinking of maybe an electronic switch but man, that is just more junk to wire...

In more train of thought stuff. I guess I could put the switch on the Tractor side. This poses the Oops question if I were to attach my mower or other device, would I wreck the device if it ran backward for a moment?

This is a straight forward solution for you reversing needs. It is only a 12 gpm valve.

Burden Sales Surplus Center Item Detail

This is a 12 v DC valve for reversing motors. Once wired up correctly, a flip of the switch will put the valve in detent for continuous operation. You need a single pole double throw switch. When you need to run it in forward, flip the switch to up or fwd, To shut the motor off, toggle it to neutral. To go in reverse, flip the switch to dn, or rev. Whatever the switch is labeled. The PTO lines go the new valve, and the output lines go to the motor. You can put QD on the lines going to the new valve, so anything you are using now will still work.

Whoever you purchase the post hole digger from, ask if it will reverse. Most of them should.

The easy way would be to just reverse the lines from the motors. You probably will not need reverse very often. except to get out of trouble such as a jam.

3238dpw · Nov 20, 2008

If you look on the loader arms you will see how someone else has done what you are looking to do.
http://www.tractorbynet.com/forums/...76775484-pt-422-nh-tc-18-376745-powertrac.jpg
Here is the thread it was in on page 2.
http://www.tractorbynet.com/forums/power-trac/33525-pt-422-nh-tc-18-a.html

J_J · Nov 21, 2008

Carl, Here is a motor spool valve, it needs to have detent at least in the fwd direction. The cost between the manual and electric valve is not that much.

Burden Sales Surplus Center Item Detail

woodlandfarms · Nov 21, 2008

So JJ, you love this Burden site. I get so confused as I do not understand hydrualics.

So what kind of motor would you recommend for the following

18GPM, 3000 PSI

A pto rated speed?

A 60 to 100 RPM speed

A 900 RPM speed.

The three projects i am mulling over is a Post Hole Digger, an adapter for a wood chipper, and a stump grinder / trencher.

On the Stump Grinder I am pretty sure I am going to go direct drive. And make it multi angle capable.

farm23 · Nov 21, 2008

Last year I was considering a phd for me 1430. Terry said he would fix one that would reverse - I do not know how much it would have cost or how he was going to accomplish the reversing - but evidently is can be done on the phd.

J_J · Nov 21, 2008

woodlandfarms said:
So JJ, you love this Burden site. I get so confused as I do not understand hydrualics.

So what kind of motor would you recommend for the following

18GPM, 3000 PSI

A pto rated speed?

A 60 to 100 RPM speed

A 900 RPM speed.

The three projects i am mulling over is a Post Hole Digger, an adapter for a wood chipper, and a stump grinder / trencher.

On the Stump Grinder I am pretty sure I am going to go direct drive. And make it multi angle capable.

This is a wheel motor, and matches up to the gpm. and will turn up to 400 rpm, not that you need to go that fast. Burden Sales Surplus Center Item Detail It has a tapered shaft, so you would need a machine shop to make you an adapter for a tapered shaft to fit the auger you are planning on using. This same motor would also work as a stump grinder, Again, you need someone to make you the adapters for the motor to the blade and select the teeth you want to use. As far as a wood chipper, those blades turn really fast. You could gear up and get the rpm.

For a good intro on hydraulics, go on Ebay and look at those hydraulic Cd's, they cover just about everything. The nest time you are in a hydraulic shop, grab some of the manufactures catalogs, They usually show all the parts and explain hose makeup, and fittings and etc. Ask lots of questions.

ponytug · Nov 21, 2008

Exactly. PT just has to put in a motor that is capable of reversing. I gather that some of the motors that they use aren't capable of reversing.

All the best,

Peter

farm23 said:
Last year I was considering a phd for me 1430. Terry said he would fix one that would reverse - I do not know how much it would have cost or how he was going to accomplish the reversing - but evidently is can be done on the phd.

woodlandfarms · Nov 21, 2008

So here is a real dumb question JJ. I assume 540 RPM PTO speed is what you get when the engine is cranking - ie maximum top speed. And that most people are probably running there standard PTO at 400 RPM or so unless they are flogging the machine?

I ask because I am looking at this chipper that wants 35 HP and 540 RPMs Just making sure when I don't hit the RPM I am still OK...