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The articulated machines won't cut my snow and dirt "plowing" requirements. The wheel/tire diameters are much too small.
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Moss . . . I'm not sure what he is trying to do, but I'd guess his assumption to be wrong.
Keith . . . I've seen a Ventrac demonstration where a 4200 with a FEL dug a hole deep enough to bury the tractor to the top of the ROPS and it then piled the dirt at the edge of the hole. The tractor drove down into the hole and then straight up the pile. It moved all the dirt with those little tires. Also, the larger PT equipement would probably move a mountain.
What I really think is that you are thinking about traction in conventional tractor terms, but the articulated-oscillating machines seem to have significantly better traction because all 4 tires place virtually equal amounts of pressure on the ground, something that only exists with a rigid frame tractor when it is on smooth/flat ground.
After working with a couple of these and seeing a few more of them working, there is no doubt in my mind that they are generally superior to traditional CUTS, and since I own 2 traditional CUTS, that is a lot of crow I am eating every time I state that the PTs are generally better and more capable machines!