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Re: tractor detail,s
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Posted by chadd on May 23, 2006 at 07:52:59 from (155.92.30.225):
In Reply to: tractor detail,s posted by kirk ,in ks, on May 23, 2006 at 07:01:50:
PTO horsepower is measured by hooking a dyno up to the PTO shaft and then using hydraulic pressure to place load on the engine. As a larger load is applied, the governor will continue to feed more fuel in to the engine so that it will maintain the PTO speed at 540 rpm. When the load is just high enough that the governor can just barely keep the engine speed fast enough to keep the PTO speed at 540 rpm(i.e the throttle plate is as close to vertical as the governor will let it go), that is the max PTO horsepower. Drawbar horsepower is just what it sounds like. It is a water brake hooked to a carriage that provides variable resistance to a tractor pulling it with its drawbar. Because pulling always involves some slippage and power loss, and involves moving the weight of the tractor its self, it will always be lower than what you get at the PTO. That is the way I understand it to be, although, I am sure someone else will be able to give you a more accurate answer.
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