3pt Stump Grinder Question

   / 3pt Stump Grinder Question #1  

ocaj11

Silver Member
Joined
Jun 17, 2004
Messages
190
Location
Northeast Texas
Tractor
John Deere 5325 4wd, Kubota B7500 HST
Has anyone built a stump grinder for your 3pt hitch?? I would like to build one using a hydraulic motor ran from my rear remotes of the DK55. I know absolutely nothing about stump grinders but I have a ton of stumps to get rid of /forums/images/graemlins/blush.gif
 
   / 3pt Stump Grinder Question #2  
There was one on EBay made by Arps for 2500 BIN couple days ago. I'm not sure how much flow it needs. One ingenious TBNer built one for a crawler mounted backhoe. Be nice to hear a follow up on it after a few hundred stumps to see how it held together.
 
   / 3pt Stump Grinder Question
  • Thread Starter
#3  
Triple M,

That project was the one that got me thinking about making a grinder for the 3pt. I would like to have some detailed pictures of a homemade version with specs for the hydraulic motor, wheel, teeth, frame, etc....

I would also like to hear how that unit held up.
 
   / 3pt Stump Grinder Question #4  
Hey guys!

I was the one who built the backhoe mounted stump grinder for my Magnatrac crawler. I ordered the hyd motor and cutter wheel from Power Trac made for their PT425 machine since my Magnatrac has similar hydraulic flow (about 8 to 10 gpm). After grinding a few stumps about 1 ft diameter with pretty good results I decided to go after the big Kahuna... a three trunk oak stump about 4 ft diameter. Grinding this was like grinding ROCK /forums/images/graemlins/ooo.gif I got about 1/3 way through and the hydraulic motor started leaking bad and smoking. It was toast /forums/images/graemlins/mad.gif
Power Trac sent me another (a White series RS - 460 RPM, 10 gpm flow instead of the Danfoss). I never got to find out what exactly failed inside it, but I believe that the direct cutter wheel connection to the motor shaft imparted end loads that the motor just couldn't hack. I haven't put the machine back together with the White motor which looks a bit beefier than the Danfoss, but I want to reconfigure the whole attachment anyway. Things I am going to change:

mount the cutter wheel on its own shaft with its own bearings so there won't be any excessive loads on the motor shaft
I envision having a sprocket and chain drive from the motor.

reorient the cutter wheel bracket so that when I go into stump with bucket curl the cutter wheel will be at an angle instead of straight (I'm going to make this adjustable to try different angles). Most stump grinders cut with the wheel side not the edge. This will allow scoop cuts instead of narrow slot cuts. It will also throw the chips to the side and away from the tractor /forums/images/graemlins/smile.gif

Making a 3 Pt version would be a bit more involved since you will have to add hydraulic cylinders to control the motion of the cutter. The backhoe already gave me up/down, side to side, and in/out controls so all I had to do was build a bracket to mount on in place of the bucket and plumb in the motor hydraulics. Buying the cutter wheel from PT also saved me from having fab it myself - reinventing the wheel so to speak /forums/images/graemlins/wink.gif Look at the various stump grinder manufacturers and you might be able to do the same.

Another way I've thought about mounting the grinder is on the loader with a bracket on a quick attach plate. Loader would give you up/down and curl, so all you would have to add is hydraulics to make the cutter go side to side. This would probably be simpler to fab than a 3 PT mounted machine.

Sorry for the long message. I hope some of this info gives you some help/ideas. If you got any other questions, just ask.


John
 
   / 3pt Stump Grinder Question #5  
After I posted my message, I saw a link to THIS SITE on the top of the forum page... they make retrofit wheels for other manufacturers stump grinders. Looks pretty interesting. Might be worth checking out their prices.

John
 
   / 3pt Stump Grinder Question #6  
Sorry to hear of the grinder gremlins, John. I recently got a Case 32 hoe att and was really rooting for that stump grinder project. Good luck on the modifications.
 
   / 3pt Stump Grinder Question
  • Thread Starter
#7  
John,

Sorry to hear about the grinder's demise. I'm sure your next iteration will be much improved.

If you don't mind, post some pics when you get around to making the modifications. We have a John Deere 410 Backhoe that can be used as well.

I'm simply looking for the cheapest way to get rid of a bunch of stumps using the equipment we currently have.
 

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