This machine is a Tigercat 720c rubber tired buncher. 90L75 sauer pump and two 51 series sauer motors. The machine pulls fine when cold and fades as it heats. I have replaced the rotating group in the pump as well the barrel, piston rings and valve plate in the motors and checked the flushing valves. Same problem. I may be getting ahead of myself here as I yet to make the road trip to check for lose of charge pressure and isolate the motors. These motors have a charge pressure relief valve. If one of these was set below the pump charge relief could that cause a super heat of the oil ? Any ideas would be appreciated .
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