David G has it right. If that 500 GPM pump is moving 500 GPM for any length of time it would be a big load for 55 HP. If it were pumping 50 GPMs at 100 psi it would burn hardly any fuel. You should be able to find out how much your nozzles or whatever flow, at a given pressure and then you can tell how heavily you are loading the tractor. 35 years as a firefighter. The problem with tractors on pumps is lack of auto shut down in case of overheat or loss of oil pressure.
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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