I have a 2007 Takeuchi tb135 excavator with 2000 hours on it. I bought it with 1700 hours and did my work that I needed done right away and now I have a chance to fix a few things. The machine travels in a curve in high speed so I start with the basics and tension both crawlers to spec. ,no change. Next I raise machine up and mark both tracks and one side travels faster than the other, both sides show a difference when pushing the 2 speed button, one side not as much. Next I have local tractor mechanic check the pressure on all the pumps and all are in spec so we check pressures at the final drives and they are also in spec but one side has more flow on the case drain than the other side.(Forgot to mention that both finals are factory drives that came on the machine new so no different ratios ) Next I changed hydraulic fluid (aw46), filter, checked strainer and every thing is clean as new. Then I bite the bullet and put a new factory final drive on the slow side, when I get done I hit the button and it kicks into high speed , works great. THE PROBLEM SWITCHED TO THE OTHER SIDE !!!. I switched pump lines 1 and 2 and no change, I switched main relief valve lines , no change. I have went through the factory troubleshooting guide. Now what ?? Will the hydraulic gurus out there help please ??:Banghead
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