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Re: Whats a ground speed P.T.O
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Posted by Dean on December 28, 2004 at 06:58:58 from (216.45.168.152):
In Reply to: Re: Whats a ground speed P.T.O posted by john in la on December 28, 2004 at 06:18:12:
In a way, yes. There has been a lot of confusion surrounding the difference between live PTO and independent PTO. Live PTO like that found on Ford 860s and others has a separate engine clutch to disconnect the engine from the PTO but only after the main drive clutch has already been disengaged. As a result, you can stop tractor movement before stopping PTO power but not the other way around. Additionally, both tractor and PTO clutches must be disengaged (or engine stopped) in order to engage the PTO dog clutch (left-side lever beneath seat). Independent PTO, like that found on the Select-O-Speed Fords and others has a completely independent clutch controlled by a dash-mounted control which can be both engaged and disengaged regardless of tractor movement. These systems can be either ground speed or engine speed (in some cases either) depending upon the type of transmission in the tractor. Finally, in a ground-speed PTO system, live or not, there is no mechanism between the PTO drive and the transmission drive that facilitates variable tractor speed while maintaining constant PTO speed. Select-O-Speed transmissions, as well as other power-shifting types and hydrostats, can be shifted (at least between some ranges) without clutching, thereby allowing variable tractor speed independent of PTO speed. Hope this helps. Dean
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