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June Craigslist

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10 years 8 months ago #87910 by chriscokid

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10 years 8 months ago #88011 by dtallon

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10 years 8 months ago #88012 by wendell f. stegner
Replied by wendell f. stegner on topic June Craigslist
I must say that's a lot of caterpillars comen out of the wood work. Must be some good deals in the mix.

thanks for sharing,
Wendell

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10 years 8 months ago #88014 by chriscokid
Replied by chriscokid on topic June Craigslist
Dave, it looks like that blade is a bit to heavy for the R5 or the equalizier spring is broke.

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10 years 8 months ago #88016 by Garlic Pete
Replied by Garlic Pete on topic Heavy!
I'd say the blade is a little heavy for the tractor. After lifting the blade, if you have to walk down the tracks like steps, then can eat your lunch in the shade under the sprockets, it usually means your blade is a little heavy. I think if the spring was broken, the sprockets would be on the ground, as would the radiator, too, likely!

I would probably be even better at making speed bumps with that tractor than normal. It is kind of hard to cut to grade when, upon moving the lever to raise the blade, the nose goes down four inches before the blade comes up, and vice versa!

Pete.

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10 years 8 months ago #88031 by zip
Replied by zip on topic June Craigslist
brackets mounted to far foword on track frame causing tractor to site heavy on front idlers. just my observation!

1929 cat fifteen,1942 cat12 grader,1956 D47u with 4S blade,

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10 years 8 months ago #88036 by Garlic Pete
Replied by Garlic Pete on topic Bracket mount position.
Zip, your much more of an expert on stuff like this than me, so I'm going to try to learn from you.

I would have thought that the bracket position wouldn't make any difference to how much lifting the blade would pry up on the track frames. It seems to me that when the blade is on the ground, the center of gravity (CG or balance point) of the track frames would be wherever it is. Let's assume it is roughly over the middle roller and for purposes of this discussion, lets not worry about how the tractor interfaces with this system. The blade CG will be somewhere forward of that, since almost all of the mass of the blade is forward of that.

The weight of the blade, however, will be spread between the cutting edge and the ends of the push arms. The cutting edge will be carrying most of the weight and transmitting that to the ground. The push arms are attached pretty near the CG of the track frames, so when the blade is on the ground there is little influence over the resting position of the track frames.

When the blade is lifted, the lift mechanism transfers all the weight of the blade to the track frames, some through more weight being on the push arm ends and most to the lift mechanism brackets. This lifting causes the weight of the blade to apply torque to the track frames since the CG of the blade is forward of the CG of the track frames.

Where I'm confused is, it seems to me that the design and attachment points of the lift mechanism relative to the track frame CG doesn't seem to me to make any difference in the torque the weight of the blade will place on the track frames. Once the blade is off the ground and all of its weight is supported by the track frames, I would have thought that the torque applied, and the tendency of the tractor to nosedive, would be constant as long as the CG of the blade system remains in the same relationship to the CG of the track frames.

Under my assumptions, it wouldn't matter whether you put the blade lift mounts clear out at the front end of the frames, clear out at the back end, put them in the middle or hung them on a pole beyond either of those, for that matter. The torque on the track frames, the lift of the sprocket and the nose dive of the idlers would be the same.

I'll agree that the position of the lift mechanism relative to the blade CG and its position relative to the push arm pivots will have a huge influence on the force applied to the pins and bushings within that mechanism, the wear of them and the required hydraulic pressure to lift and get the speed required.

Maybe I'm wrong in some of my understanding. I am, after all, just an accountant and not an engineer or an operator.

I'd be interested to hear your thoughts.

By the way, I hope your shoulder is feeling better. I'm sorry you got hurt, but I'm glad that it has allowed you to spend more time on here, at least.

Pete.

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10 years 8 months ago #88039 by dtallon
Replied by dtallon on topic June Craigslist
It does look a little nose-heavy... Agree with Pete that a setup like that could help anybody make a good motocross track. I wonder what the idlers look like carrying all that weight on the nose. It looks like everything is attached to the track roller frame, so the equalizer spring shouldn't be under any extra load, just some extra strain trying to keep the roller frames from wanting to do the splits.

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10 years 8 months ago #88040 by zip
Replied by zip on topic June Craigslist
weight over idlers blade is heaver then rear end of tractor trunions are towerd the rear not on cg causing it to lift the rear end up. old d8h's 6 roller frame did the same thing then they went to 7 roller frame. and i'm bar fare an expert its just the way it looks to me!

1929 cat fifteen,1942 cat12 grader,1956 D47u with 4S blade,

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