Steven f/AZ said: (quoted from post at 10:03:04 02/10/08) Just remember if you are going to drive something off the front pulley on the crankshaft that the only thing driving it is a couple of half-moon keys. I've had a couple of A's apart that had ruined the keyway in the pulley when the nut came loose and it looks like the keys aren't really strong enough to supply a ton of horsepower.
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the fords with the front drive pumps also have a woodruff key driving the crank pulley. lil tractors like an 8n all the way to 60 hp models. many have been used hard for 40+ years that way based on testimonials from the ford guys. i also think think that there is some type of shear safety device used in the pump shaft coupling. unfortunately i do not own or have access to one, but the guys on the ford board will have lots more info for you :) also, you are not going to use a pump that requires 50% or 100% of the power out of the engine. on that note, the road/ditch mowers you see mounted to regular ag tractor models (deere, kubota, cih/cnh) often drive the pump off the crank in front, and those pumps will take up to all the available hp out of the engine.
BUT steven's point helped me realize that possibly engine manufacturers on the applications i've mentioned designed their pulleys and cranks to also be pto duty from the start, unlike an A or H, etc where it was designed to just spin a couple light accesories. look into other applications of your engine, and at how beefy the pulley on yours is. it might have some beef to it and holes tapped in it already, or it may look like if you dropped it it would shatter.
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