Posted by John in La on July 11, 2010 at 10:43:42 from (68.222.28.49):
I have a Bush Hog Model 502 brush cutter with removable side panel that came with my tractor when I bought it. The tractor is a Ford 861 diesel and is rated at about 40 PTO HP. I have found out that it originally came with a clutch in the PTO driveline but the original owner replaced the PTO shaft for some reason and did not put any kind of overload protection in it.
I am on the fence on how to fix this problem but know I need to do something. Since the input shaft of the cutter gear box is splined I can not use a normal shear pin.
So now I feel my options are a clutch.... or a shear pin type yoke.
I really do not want the clutch because I am afraid of seizing up over time from being out in the weather but some people have said this would be my best choice because it does not have any shear pins to worry about.
My problem is I do not know anything about PTO drive line ratings and or what system to buy. I see metric shafts; different class ratings; ect.. and need some help deciding what to buy.
So what class/inch lb rating should I be using on a 40 pto hp tractor?? I would like to cut down and reuse my old shaft but do not know what to look for to get matching parts. I might even consider a whole new shaft if the difference in price over piecing this old shaft to a new over load protection is not to much.
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