We have used the Shurwood Aquatiger pump for the last 10 hrs on the tractor.. This yr I had to put a new seal in it. ( I don't think it was the heat.. Others have gone longer.) Use one with the the bronze impeller.. But I have been looking at the ones from summit and Jegs for the next tractor.. Surpluscenter.com had the Aquatiger pumps..
Bryan
Bryan