Im building 2 different styles of one right now for my backhoe and excavator. One is just a hydraulic motor on a plate with a ssprocete and shaft running from it to a sprocket on the bearing and shaft assembly from a combine part. I dont think it will work too good. THe other one is a hydraulic motor and a Fairfield Torque hub planetarey that came out of an older excavators swing mechanism. The otor was bad but i had another hydraulic motor that was smaller and had the same splind shaft on the end of it. Im working on finding a splined coupler to attach my augers adapter shaft to the splines.