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Old 09-17-2013, 10:32 PM
gebby gebby is online now
LawnSite Senior Member
 
Join Date: Nov 2009
Location: COLUMBUS, OHIO
Posts: 662
Yesterday I said to check the key on the pully. I should have said the set screw. Small allen wrench needed. I'd get the rmp's up there above 3450, open the valve at the bottom and see how many oz. you get out of that in 60 seconds. There is half a dozen things you can check. The belt could be slipping. Do a search on this sight. At the top there is a search engine. Your question has been brought up many times. I think there also is a diagram of the Magnum on their web sight. As you mentioned your pump may be shot if you haven't used it for a while. Wish you luck.
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