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PTO question?

There are 3 kinds of PTO.
1) Transmission PTO: runs off the transmission and has power only when the clutch is engaged. It is geared directly to the drive wheels when engaged and the inertia of an implement can keep the tractor moving for several feet when you step on the clutch pedal if you don't use an overrunning clutch.
2) Live PTO: uses a two-stage clutch;first engages the PTO, second the transmission. When you step on the pedal, half way down disengages the transmission, all the way down disengages the PTO as well. The PTO is disengaged from the transmission when the clutch pedal is pressed.
3) Independent PTO: The clutch pedal is for the transmission only. There is a totally different clutch (usually a lever) for the PTO. The PTO can be started or stopped regardless of what the transmission is doing. The transmission and PTO operate completely independently of each other.
I hope that covers it.
 
Tractors with out a live PTO operates the PTO from the same clutch that runs the transmission. If you push the clutch to stop the tractor you also stop the pto. A live PTO operates separately from the transmission clutch so stopping the tractor has no effect on the PTO.
 
Good explanation...in addition, AC used a hand clutch to get live pto. D Series used a Hi-Lo, similar to IH TA, but had a clutch in the middle position- giving live pto and hyd.
 
There is one more variation of PTO that you don't see very often, usually on tractors built outside the US. That is the ground speed PTO. It is powered after the transmission so that the shaft speed is directly related to ground speed. On those tractors you can usually select between ground speed and transmission driven PTO.
 
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