Posted by Billy NY on December 05, 2012 at 11:37:55 from (24.29.79.122):
In Reply to: Why Triangular Tracks? posted by in-too-deep on December 05, 2012 at 10:41:19:
You'll open a can of worms on some forums with that one.
I'm going to say that the older design, certainly well proven and in use, must have had a lot to be desired, (dead axle/final drive)
On the older caterpillar tractors, it required special tooling, high tonnage pullers etc. + a lot of labor to take apart, the newer design, I believe is more "modular", easier to take apart, trans is supposed to roll out. Also the weight of the tractor on the sprockets, shock loads and or similar, I believe was another motivating factor. Large mining operations and similar, putting thousands of hours on these, overhauling them etc. easier to work on, more service time, likely had some influence. In short, there was reason for the design, with benefit. They do have a production model, D7E that looks like the old design, I saw one on a lowboy a few weeks back, but I have no idea if its the same or similar final drive arrangement of the past.
I can only believe that the changes in design, back in the 70's was motivated by many factors as mentioned above in addition to a design that is easier to service, repair and overhaul.
There is a real old Cletrac crawler model with an elevated sprocket/triangle tracks, must have been ahead of their design.
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