pulling weight???

[johnk]

Just because you get the rope high up in the tree doesn't mean it is going to get pulled over. I had a Maple about 20" DBH that I tried that with and the tree split 3/4 of the way up. Nothing is for certain when working with the unknown. It may be rotted etc. just be careful is the main thing....

 

[c23380]

HEY, I FOUND IT.......According to the published info I found, the term I am looking for is rim pull. Evidently using the traction coeficient of dir being hard pack then I would have to multiply the weight of machine by the traction coeficient of .55 and this is the calculated lbs I can pull. This being said my machine weighs 3500 lbs, so I multiply this by.55 and come up with1925 lbs. This being the max amount assumimg the load is not adding weight to the pulling tires, (ie load being pulled is lower than drawbar) then I shound be fine with a 5000 lb rated rope or cable.
Found this under the usable power section of a book called Estimating Excavation by craftsman book co, Deryl Burch. I would post the link but I am not sure how. Thanks guys

 

[jonstark]

When selecting rope or cable consider that a dynamic rope, like a climbing rope, is very stretchy and will come slinging back atcha like a rubber band with painful or injurious results. Static or non-stretchy rope, is less likely to stretch and snap back but will to a certain degree. Cable and chain are the order of the day. Harder to handle but safer by far.

jon

 

[john_bud]

I would think long and hard about how to protect from death when the cable breaks and comes flying back faster than the speed of sound. (literally)

 

[Treemonkey1000]

C23380 are you wanting to pull the tree and root ball over in one shot? Or are you going to be cutting the base of a tree with a saw and pull it with the tractor? As mentioned in other post there are a lot of things that can go wrong pulling too hard on the tree. If you want the root ball to come up your are probably safer taking down a majority of the tree first. The trees will barber chair and snap if you are pulling from high up possibly even if you have dug around the base.
If I had my rathers about what I was using to pull a tree with it is a rope in most situations. I use 1\2" climbing ropes about 99% of the time. If they get cuts or nicks in them that rope is retired for other uses that don't need the margin of safety.
There are other threads on the site about cab protection and rear cab cages to help slow down chains, cables and other nasties from the operator.

 

[kthompson]

If you will use a pulley (fastened to another tree as has been mentioned) to run your rope or cable around and have the tractor away from it and several feet from the run to the tree if which ever you are using were to snap it should be less likely of hitting and thus hurting you or your tractor.

 

[c23380]

Thanks for the ideas. I first have to splitt and finnish sawing up what I have down, but this spring I will begin the tree removal. I like the pulley and will impliment this into my process. Thanks to all who posted, Mike

 

[JoelD]

I agree with Treemonkey, for maximum leverage pulling from high up the tree will most likely tip it. The only problem with this is that forward motion of the tractor lifts the rear end so you lose traction. What I have done is use a snatch block anchored low to keep the rear of the tractor on the ground. To do this you should keep the geometry such that the distance from the snatch block to the base of the tree is greater (much greater is better) than the height up the tree where you are pulling. Also, the lower the snatch block is relative to the tractor the better because pulling then adds weight to the rear wheels.

Steve

I've seen guys attach the pull rope at the front of the tractor and run it under the tractor and out the rear, the harder you pull the more you load the front tires. Flipping backward is geometrically impossible. I thought it was a super idea.

Joel

 

[two_bit_score]

Why not push them over rather than pull them?

 

[SPYDERLK]

HEY, I FOUND IT.......According to the published info I found, the term I am looking for is rim pull. Evidently using the traction coeficient of dir being hard pack then I would have to multiply the weight of machine by the traction coeficient of .55 and this is the calculated lbs I can pull. This being said my machine weighs 3500 lbs, so I multiply this by.55 and come up with1925 lbs. This being the max amount assumimg the load is not adding weight to the pulling tires, (ie load being pulled is lower than drawbar) then I shound be fine with a 5000 lb rated rope or cable.
Found this under the usable power section of a book called Estimating Excavation by craftsman book co, Deryl Burch. I would post the link but I am not sure how. Thanks guys

I think that that traction coefficient is very conservative. Even for a friction coefficient it seems conservative. I know for a fact that traction coefficient of AGs is above 1 on firm soil and turf because the high pressure points of the lugs bite into and interlock with the surface. As I said earlier I have done measurements showing a traction coefficient of about 1.2. Very hard pack would decrease this. If so hard as to eliminate tread bite it should be stated as the friction coefficient of rubber on dirt. The treads offer little benefit in such a case, only a little extra grab on irregularities.
larry