PT 425 PTO Specs

[mlhunter]

. . . been awhile! My brother and are looking to put together a farm and fence "sprout" cutter for my PT 425 by running a 12" saw blade off a higher speed hydraulic motor. The blade speed we need is doable but to select the right motor I need the specs on the PT 425 PTO pump or the stump grinder motor which runs off it. If any one has that info we would appreciate it!

 

[Gravy]

8gpm, 2500psi.

We want pictures!

 

[J_J]

Like this.

 

[mlhunter]

Like this.

There would be some similarity to yours but ours would be made to drive up to a sprout and cut if off after cleaning up around it with my 4' Power Trac brush cutter. We have a bunch of young eastern cedars up to 4" that we need to get down along areas not farmed and also along fences. We also have groves of what I call willows that my 4' brush cutter chokes on. Those individual sprouts the brush cutter can't handle are what we would be targeting.

The shielding and the drive motor would be similar but it would have a circular type saw blade and be attached to an extension of my 2" hitch receiver plate. We may have to add some bracing on it although that remains to be seen.

We're thinking a 12" (or 14" if feasible) circular saw blade would let us cut our way into the cedars so we can see enough of the trunk to cut them down. We could than cut each down and the few that are bigger we would fell with a chain saw.

 

[BobRip]

Be careful the trees don't fall on you.

 

[mlhunter]

Be careful the trees don't fall on you.

LOL, that ROPS on my PT has saved my head a few times! We plan on extending it out in front of the tractor 3'-4'. Fortunately the cedars aren't very tall and they are soft! The other stuff is more like 1" to 2" diameter and not that tall.

However, that did make me think about putting a some kind of bar across behind the blade so the cut off sprout falls off to the sides instead of laying over towards the the tractor!

 

[FAZTRAC]

Have you looked at the new steel cutting 14 inch circular saw blades that are made to turn at a slightly lower RPM like the Evolution brand saws.
They cut through steel like butter with a clean cut and would seem to be very durable and since they can turn at a lower rpm you could use a higher displacement motor with resultant increase in torque for the cutting mission.
Just an idea if you havent already chosen a blade.

 

[MossRoad]

Just be careful about brush coming back into the operator's area and pushing the joystick back unintentionally. I've had it happen a few times, where I am pushing into dense brush only to have the implement suddenly start to raise without me raising it. Look over and there is a branch pushing the joystick back as I drive forward. It can happen very quickly. Extra caution should be taken with a moving implement like a saw or brush hog.

 

[J_J]

There would be some similarity to yours but ours would be made to drive up to a sprout and cut if off after cleaning up around it with my 4' Power Trac brush cutter. We have a bunch of young eastern cedars up to 4" that we need to get down along areas not farmed and also along fences. We also have groves of what I call willows that my 4' brush cutter chokes on. Those individual sprouts the brush cutter can't handle are what we would be targeting.

The shielding and the drive motor would be similar but it would have a circular type saw blade and be attached to an extension of my 2" hitch receiver plate. We may have to add some bracing on it although that remains to be seen.

We're thinking a 12" (or 14" if feasible) circular saw blade would let us cut our way into the cedars so we can see enough of the trunk to cut them down. We could than cut each down and the few that are bigger we would fell with a chain saw.

Could you use something like this?

YouTube - ATV-X TREECHOPPER!

 

[mlhunter]

Have you looked at the new steel cutting 14 inch circular saw blades that are made to turn at a slightly lower RPM like the Evolution brand saws.
They cut through steel like butter with a clean cut and would seem to be very durable and since they can turn at a lower rpm you could use a higher displacement motor with resultant increase in torque for the cutting mission.
Just an idea if you havent already chosen a blade.

. . . will keep that in mind, thx!

 

[mlhunter]

Could you use something like this?

YouTube - ATV-X TREECHOPPER!

I think that would work in most places. Where it might not work well is where we have groves of what I call "willows" that grow very close together. However, we could use this on my brothers Polaris and that would sure speed up the work! I'm not sure how well it would work on fence rows either.

I found this on utube, its what we had in mind building for the PT 425. It would handle the cedars and the "willows".

http://www.youtube.com/watch?v=usRalgTD4Qo&feature=related This has been corrected!

 

[BobRip]

I think that would work in most places. Where it might not work well is where we have groves of what I call "willows" that grow very close together. However, we could use this on my brothers Polaris and that would sure speed up the work! I'm not sure how well it would work on fence rows either.

I found this on utube, its what we had in mind building for the PT 425. It would handle the cedars and the "willows".

YouTube - Bobcat Brushcat Rotary Cutter Attachment

Wow! I wonder if the PT can go fast enough to cut that. Is this better than a brush cutter? What are its disadvantages? Do the blades need sharpening?

 

[J_J]

I think that would work in most places. Where it might not work well is where we have groves of what I call "willows" that grow very close together. However, we could use this on my brothers Polaris and that would sure speed up the work! I'm not sure how well it would work on fence rows either.

I found this on utube, its what we had in mind building for the PT 425. It would handle the cedars and the "willows".

YouTube - Bobcat Brush Saw Attachment This has been corrected!

There is not a lot of building for something like this, Just find a 4 ft bush hog, and a hyd motor and coupler for the gear box. Add QA to the rig and you are done. Used bush hog about $300, hyd motor about $150 to $300.

https://www.surpluscenter.com/item.asp?item=9-4124-03&catname=hydraulic

The PT rough cut mower would so just as well.

 

[3238dpw]

JJ, Would you say that is the actual motor that should be used for the 425 with a 4' brush hog.

 

[J_J]

No. The motor should be chosen to match the pressure rating, and the GPM. This motor is designed as a PTO hyd motor, but it needs about 17 GPM to operate it. The 8 GPM from the 425 would run it, but would be about half speed. The splines are correct for this motor also.

https://www.surpluscenter.com/item.asp?item=9-7368-100&catname=hydraulic

 

[3238dpw]

No. The motor should be chosen to match the pressure rating, and the GPM. This motor is designed as a PTO hyd motor, but it needs about 17 GPM to operate it. The 8 GPM from the 425 would run it, but would be about half speed. The splines are correct for this motor also.

https://www.surpluscenter.com/item.asp?item=9-7368-100&catname=hydraulic

Thanks JJ. So that motor will even hook right up with the splines. That is pretty cool! i wish I had a better understanding of how to figure out motors needed for different projects.:confused2:

 

[mlhunter]

There is not a lot of building for something like this, Just find a 4 ft bush hog, and a hyd motor and coupler for the gear box. Add QA to the rig and you are done. Used bush hog about $300, hyd motor about $150 to $300.

https://www.surpluscenter.com/item.asp?item=9-4124-03&catname=hydraulic

The PT rough cut mower would so just as well.

We don't have much time and we're trying to keep the cost of this project under $500.00 so we decided to see what we can accomplish with the stump grinder motor and blade that I already have. We can mount the motor and blade assembly rotated 90 degrees from the original and it becomes a saw blade (sort of). Then it becomes a matter of how it will cut with that slow a rotation. The existing stump teeth may work for cedars as they are pretty soft. However, it will be better if we can find a way to fit a 12" saw blade onto the motor. We may have to have a machine shop make an adapter if necessary. If it cuts slow that's ok as its still better on our backs than using a chain saw!

It goes without saying we will be doing the necessary shielding on this rig to keep it safe.

Any ideas for connecting a saw blade to this motor would be appreciated.

We are also considering replacing the stump grinding blades with 4" sharp blades that we can make and heat treat to handle the abuse.

 

[Gravy]

I converted my stump grinder to a 2" square mount so I could use it horizontally. That lets me approach the stumps from different angles. I've cut down a few saplings, but it was painfully slow. If I were going to use it for brush clearing, I would definitely adapt a circular saw blade.

 

[J_J]

mlhunter,

Tell me the cu in of the stump grinder motor, and diameter, and I can tell you the rpm, and blade tip speed. I don't think the rpm of the stump grinder is very fast. There are way to get fast, and that is more GPM's, and a smaller cu in motor. You can increase bld size for more blade tip ft per min.

 

[J_J]

I converted my stump grinder to a 2" square mount so I could use it horizontally. That lets me approach the stumps from different angles. I've cut down a few saplings, but it was painfully slow. If I were going to use it for brush clearing, I would definitely adapt a circular saw blade.

Gravy,

Does your stump grinder motor have a tapered shaft or a straight shaft?