Posted by RodInNS on December 05, 2012 at 15:12:51 from (216.118.158.123):
In Reply to: Why Triangular Tracks? posted by in-too-deep on December 05, 2012 at 10:41:19:
The primary reason for Cat High drives was to get the sprocket up out of the danger zone where it could be impacted by rock, etc on the end of the track frame. A busted idler is cheaper to fix than a busted final drive... Secondary concerns... high drive allows for an easier component layout in the transmission case. Those machines have a modular, planetary transmission that is easily serviced by pulling the sun shafts from the final drives and unhooking the input shaft... then undo the bolt ring on the back and the whole works slides out on a tray. So the machine is far, far easier to do major service on. IIRC, a Cat tech told me years ago that they'd have a 4H transmission on the truck in about 2 hours. You won't even hope to do that on any competitors machine... Beyond that... probably not too many advantages. I find the machine to be nose heavy with a high center of gravity. However... it does also have considerably more ground clearance. That can be an advantage.... Personally I like high drive dozers. You're also seated up high and have good visibility.
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