I see no one knew the directionality of a pressure pump. Pump vendor is not replying either, sad what customer service is like nowadays. I believe it is bi-directional but I opted not to experiment.
BUT, I now have eliminated another gas engine to maintain. I mounted the pump on my trash pump drive (20K gph) so it is running in the normally accepted direction. The pump frame is mounted on my Kubota quick hitch system for easy on/off. I have 2.5/1 gearing on the mid PTO shaft so at normal pump RPM, engine is running at the low end. Used it for about an hour and a half yesterday morning cleaning the decks. Dirt and grime come off easy................ now, how to get the leaf stains off..........