what hydraulic oil are you running in the machine? I run ISO46 in my hyd drive machine with no issues with foaming..all return ports and motor case drain come into the tank near the oil line but have a 'plenum' or baffle that prevent it from getting drawn into the pump without circulating first..simply a section of 3x3 box tubing with one long side cut out, it forms a "C" welded inside against the wall of the tank where the return ports are..deflects the oil away from the suction port area..is this Cadtrak built to the engineering drawings or has it been built differently or modified?
