skid steer brush cutter motor. HELP!!!!!

[pairofhounds]

Trying to find out a good direct drive/axial piston hydraulic motor for a heavy duty brush cutter. I have already built one using motor connected to gearbox. Naturally, no manufacturer wants to share this info. I have a bush hog 672 that Id like to put a direct drive motor on. Anyone got some ideas? Hi speed hi torque. 20-30 gpm flow. like the setup in attached photo...
2012 CID skid steer brush cutter | no-reserve auction on Friday, November 15, 2013 |

 

[J_J]

I am assuming you looked at the price of the skidsteer.

Just a plain hyd motor with the cu in displacement to provide enough torque will run too slow.

If you look close, that motor is connected to a planetary gear assembly.

It also has a case grain.

That is to up the speed.

A 30 cu in hyd motor using 30 GPM will run at 231 rpm and produce about 14324 in lbs of torque working at 3000 psi.

If you feed that into a gear box, you have to work out the blade rpm and you will also lose some torque.

 

[pairofhounds]

Any tips to create a comparable unit? The excavator cutter you helped me with works great! Now working on a heavy duty skidsteer unit..

 

[J_J]

Tell us what the gear box ratio is and we can compute the blade speed and torque.

It would take about 52 HP to drive that motor to full capacity.

 

[pairofhounds]

I don't want to use a gearbox. Just like the direct drive in pics

 

[J_J]

That is a gear box in the picture.

My educated guess says gearbox.

I could be wrong.

 

[pairofhounds]

Check out the xtreme unit Brush Cutters Archives - CID Attachments

 

[J_J]

They are running through a standard gearbox.

On our Power-Trac's brush cutter, they use a direct drive hyd motor.

I believe they use a 3 cu in hyd motor to turn the blades.

The PTO GPM is about 8 GPM, so the speed would be about 616 rpm for blade speed.

A gear box can increase the speed or increase the torque.

The X-treme Brush Cutter does use a piston direct drive hyd motor.

This is a piston hyd motor, and you can bet that they are not cheap.

Eaton - Hydraulics - Motors - Piston Motors - Heavy Duty Piston Motors

3.3in3/rev to 7.6in3/rev, Max speeds to 4500 rpm, Max pressure to 6000 psi.

Here is a small piston hyd motor.

1.89 DYNAPOWER/STRATOPOWER PISTON HYD MOTOR

 

[pairofhounds]

Ok... so where and what parts do I need? Thanks!

 

[pairofhounds]

Nevermind. I see your post. Will check