old General Hydraulics G6 farm sprayer pump w/PTO coupling for tractor

Old tractor driven roller type sprayer pump from an old farm estate. This pump is a model G6 from General Hydraulics Corp. It has a splined coupling to connecting to the PTO (Power Take Off) shaft on a tractor. It measures about 6" across and 4" long on the pump ( 8" long over the PTO coupling). The threaded pump ports are about 1" across. The drive spline measures about 1 3/8" across (measured over the spline teeth on the inside of the coupling) and has 6 teeth.

This pump seems in good condition, although we haven't run it (just turned the pump over by hand).