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Allis Chalmers Discussion Forum

Live PTO vs. Non-live PTO

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Tom Hallick

01-30-2004 19:53:07

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I have a 1947 AC B, Does it have a live PTO or a non-live PTO? What is the difference and how can I tell? Thanks in advance for any help.


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01-31-2004 07:24:10

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 Re: Live PTO vs. Non-live PTO in reply to Tom Hallick, 01-30-2004 19:53:07  
B and C models do not have a live pto. Live means there is some means to stop the tractor wheels from moving while maintaining pto speed. Some tractors have a two stage clutch, others use a second clutch. Independent pto is direct engine driven with its own clutch- can shift the pto in or out of gear irregardless of tractor motion. WD45 has a separate clutch ahead of the transmission to stop wheel movement- it is not on the rear axle like on the CA.

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01-31-2004 02:34:24

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 Re: Live PTO vs. Non-live PTO in reply to Tom Hallick, 01-30-2004 19:53:07  
NO. Live PTO means you have a two stage clutch where you push it half way down, the power to the transmission stops, stopping the tractor but the PTO still runs. When you push it all the way down, the PTO stops. Very handy for mowing and baleing.

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01-31-2004 06:16:42

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 Re: Re: Live PTO vs. Non-live PTO in reply to CH, 01-31-2004 02:34:24  
also, most hydraulic pumps mount in the back by the pto. when you push in the engince clutch to stop the tractor, the pto and hydraulic pump stop also. you can not railse implements, or use hydraulic cylinder with the clutch in, you must kick transmission out of gear and let the clutch back out.
---the newer CA and WD45 series tractors put a second clutch on one rear axle. you pull the hand clutch which disengages the axle and you stop movemnt of the tractor, but transmission, pto and hydraulics are still moving.

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Dave K

02-01-2004 10:18:51

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 Re: Re: Re: Live PTO vs. Non-live PTO in reply to steve, 01-31-2004 06:16:42  
The WD and WD 45 do not have a clutch on one rear axle. They have a hand operated transmission clutch, running in oil, which stops forward motion and allows the PTO and hydraulics to function just fine. To stop everything they have a dry engine clutch with a standard clutch foot pedal.


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