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That would greatly help if you could get me a schematic ...would greatly appreciated

The rotary manifold has been rebuilt. I am thinking it is something to do in the main control bank that switches from one pump to the other , just don't know what .....Lisa

1990 590D excavator ....had pumps rebuilt as thought this was problem but my left track travels slow ...if using bucket while traveling it works great but once I stop track wants to also ...all pressure test are great. Been going through my 3 books and no matter what I do nothing seems to work ...at...