Stump Grinder Questions!

   / Stump Grinder Questions! #1  

Scotty370

Platinum Member
Joined
Dec 18, 2008
Messages
896
Location
Buffalo, New York
Tractor
318 John Deere, 4200 John Deere, 1947 John Deere "M"
I want to build a 3 Point hitch Stump Grinder Attachment patterned after several after market units out there for my John Deere 4200. (26hp 3cyl Diesel w/ Backhoe/Bucket). Two immediate questions: What is the cutter wheel rotation suppose to be? I say lower teeth should be moving toward the tractor. Thus if your standing on the right side of the machine it would turn counter clockwise! The PTO turns counterclockwise (Doesn't it?) thus a right angled gearbox mounted on the left hand side would cause it to turn as described! This would cause the tractor to be pulled toward the stump when cutting. I think that's safer than having it try to launch the tractor forward. Also, Wouldn't it relieve 'side pressure' bearing wear if I were to build it with a shaft mounted cutter wheel supported on both ends with pillow blocks? I would leave a splined end facing the gearbox that I could hook up with a Lovejoy type connector. (IE two internally splined metal hubs with a rubber insert. Also I need parts sources for the wheel if I don't 'tooth up' a piece of 1/2" plate. I'm thinking a 24" wheel! Any help appreciated! ~Scotty
 
   / Stump Grinder Questions! #2  
I don't own one but there are videos of them on the Shaver website, Baumalight website and the Bobcat website and probably other places too. I figure you can probably see from there which direction the spin.
 
   / Stump Grinder Questions! #3  
A lovejoy style coupling is your first mistake. You should use a solid coupling or a pair of sprockets and double strand chain coupling if you are worried about alignment. Shaver uses a solid coupling, I'm pretty sure.
 
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   / Stump Grinder Questions! #5  
I have seen a very large grinder work in my yard a few times. It's the dirtiest operation you ever want to be involved in. If there is a way you can direct all that dirt and wood/dirt combination stuff AWAY from the operator and the tractor and the tractor's air filter, you will be happier. Oh yea, and another thing: the machine shakes and jerks violently sometimes. Plan for that too, if you can.
 
   / Stump Grinder Questions! #6  
I just watched a video and the shaver rotates clockwise when standing on the right side of the tractor. Or it shoots the chips out the back. Never noticed before but they have a guard that deflects most of the chip to the ground so they aren't scattered all over the place. If you decide to continue this project please give us progress and photos.



Wedge
 
   / Stump Grinder Questions! #7  
Getting the grinding wheel to turn is going to be a project in itself. But the hydraulics to move it in and out and back and forth will be a bridge to far for most do it yourselfers. Probably one of the most complicated projects you could tackle.
 
   / Stump Grinder Questions! #8  
Here's a picture of mine.
Grinder cuts down on the stump. Or counter-clockwise as you are looking at it. Cutter wheel is about 20" in dia - 3/4" plate and has 9 sets of carbide teeth. John
 

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   / Stump Grinder Questions! #9  
A larger picture
 

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   / Stump Grinder Questions!
  • Thread Starter
#10  
Thanks folks! I'm getting closer to a 'sit-down' at the drawing board! Looks like most of the commercial stand alone machines such as John's cut the chips toward the machine. I'm thinking it's safer on a 3-point hitch rig to have it throw the chips (stones, etc!) rearward. That will work, as I believe that my 540PTO turns clockwise (as you look at it from the rear of the tractor on my JD. (Can anyone confirm this? The tractor's at my summer place 50 miles away!) Thus, when the shaft goes to the 1:1.5 gearbox, and a shaft to the cutter, it will be throwing chips and debris to the back Was going to buy a wheel, but I've found teeth I can use at Greenteeth.com that I can mount on a 1/2inch plate wheel that I'll cutout. Now I have to figure out how to mount the tooth pockets as far as spacing goes! I'll be using 18 teeth, that mount in two's, at 9 locations. Thus, they'll be at 40 degrees between each pocket location. The problem arises because on the machines I'm trying to mimic, some of the teeth appear to be mounted closer to the hub than others! Darned if I can find a picture of a replacement wheel on the net that I can 'cheat' from!!! Thanks in advance for all input! ~Scotty
 

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