I have a Cat 247B skid steer and the ECM that controls the Aux Hyd has quit according to the Cat dealer. They want an arm and two legs for a rebuild one. From looking at the schematic I was wondering why you can by pass the ECM all together. There is a rotary thumb wheel that controls how fast the HYDs operator. Here is a break out of the schematic. I tried to paste a schematic but this system would not let me.