Posted by MarkB_MI on February 17, 2023 at 05:00:18 from (174.240.149.176):
In Reply to: HP vs PTO implements posted by perryjosh64 on February 17, 2023 at 04:35:50:
PTO horsepower should be rated at the nominal PTO speed, 540 rpm in the case of your Ford. Engine horsepower is typically rated at maximum rpm. So the PTO rating will more closely match the implement's requirements than the engine horsepower rating. Does that mean your tractor can't handle a mower that supposedly needs at least 45 hp? Not at all; you can probable still run it but you may need to slow down your ground speed.
BTW, the Nebraska Tractor Test of your Ford says it put out 31 hp at 1900 engine rpm but only 26 hp at nominal PTO speed (540 rpm PTO/1484 engine rpm). Presumably both measurements were made at the PTO.
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