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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

WHEELED VS TRACKED ON SOIL COMPACTION

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Joe Bly

01-31-2007 06:33:04




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So all things being equal which do you think compacts the soil the least?? I know that most research has found that on the newer rubber tracked tractors that compaction is about the same as with wheeled tractors. This is due to most of the tractors weight bearing down on the center of the tracks where the rollers are. I think what happen is the outer edges flex since they are rubber and the weight is concentrated only on the center of the track. So what I am wondering is, how do the older crawler tractors do as far as compaction?? I would think that since the tracks are steel they would not give as much and thus spread the weight out over a wider area. What do you all think?? Would love to hear from people who have or do actually farm with these older crawlers and hear what your thoughts are. Thanks

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Case450

02-01-2007 20:10:23




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 Re: WHEELED VS TRACKED ON SOIL COMPACTION in reply to Joe Bly, 01-31-2007 06:33:04  
I think a wheeled machine would compact better. All the of the weight of the machine is set down on the foot print of the machines tires. If you have a ten ton machine, that would be ten tons pressing down on the actual footprint of the tire on the ground. I'm no scientist or nothing like that but thats just how it figures to me. However, packers are usually very wide AND they vibrate. H'm, maybe i'll change my figuring to the heavier machine compacts better..lol

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seann

01-31-2007 09:33:57




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 Re: WHEELED VS TRACKED ON SOIL COMPACTION in reply to Joe Bly, 01-31-2007 06:33:04  
Yeah, tracked machines almost always have a much lower load bearing than wheeled vehicles, especially of comparable weight. But there are times when I think tracked vehicles can compact reasonably well. For one thing a tracked vehicle often will vibrate the soil in a way that a wheeled vehicle doesn't (not enough to offset the difference, but the vibration does help). And I recall a time when I was digging into this deep clay pit with my tracked loader. I would go down into the pit and dig out the clay and bank run and then back out of the pit via the ramp leading into it. As I would exit the pit at the top, the loader would pivot, or balance on a certain point at the edge of the ramp so that the entire weight of the loader + dirt load (~30,000lbs) would grind and bear down on that pivot edge. I drove in and out of that pit all day, all the while grinding and turning on that edge. By the end of the day, the clay on that edge was the hardest and most compact soil I had ever seen. It had almost turned the soil into a rocklike surface, it actually hurt your knuckles to rap on it.

But of course that's a special case, ordinarily you're not going to get that kind of compaction with a tracked vehicle. Although on the other hand tracking in loose slopes is something a tracked vehicle can do that a wheeled vehicle can't touch due to traction limitations.

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Grampa Leon

01-31-2007 06:57:51




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 Re: WHEELED VS TRACKED ON SOIL COMPACTION in reply to Joe Bly, 01-31-2007 06:33:04  
Crawler tractors compact much less than wheels
[this is why Mr. Holt developed tracks by bolting
on wooden planks]to navigate otherwise too soft areas.



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