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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: High track dozer

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NCWayne

10-22-2013 18:44:21
98.21.228.82



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Your right in that, there are a lot of mfgs making new, low track machines that are hydrostatic. In fact, Deere/Liebherr makes one. The bad thing about them is that the drive motor/planetary is located on the track frame, and the hydraulics has to get out to them. To get there everything runs through the shaft the frame pivots around. With that setup, when the bushings in the pivot joint go bad the track frame gets cocked, and starts hitting two plugs that are in the pressure ports. The plugs then start leaking, telling you that the bushings are completely worn out and need replacement. I really don't think the designers planned it this way, but that's what routinely happens.

The fun part is trying to pull the track frame to replace the bushings. The design of the machine that I worked on, a 650 Deere, is such that the 'upper' works sticks out to each side which puts the track frame back under a ledge. Talk about a royal PITA, try getting the frame to set, and stay level enough to go back on the pivot shaft when the cable on the crane hits sheet metal 6 inches before the frame hits the shaft....

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