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Ford Tractors Discussion Forum
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Re: Tractor Model

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Sean in PA

04-28-2013 04:32:07

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Yes, the x81 models (681, 781, 881 & 981) had the Select-O-Speed transmission with 3 PTO speeds, 540 rpm, 1000 rpm and ground speed. The x71 models only had a single sped 540 rpm PTO.

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pete black

04-28-2013 06:40:58

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 Re: Tractor Model in reply to Sean in PA, 04-28-2013 04:32:07  
Thanks Sean. thats the answer i was looking for, guess i ask in the wrong manner. my sos was 540 only by pulling the lever. how do you select 540 or 1000 rpm? also, is ground speed a seperate function? thanks again.

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Sean in PA

04-28-2013 18:57:17

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 Re: Tractor Model in reply to pete black, 04-28-2013 06:40:58  
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Pete - There are 2 levers on the left side of the tractor. The first one is on the side of the transmission up near the front of the foot rest. That lever has 3 positions, 540, Neutral and 1000. The second lever is on the left side of the rear axle center housing, near the rear of the left foot rest, and that second lever has 2 positions, neutral and "ground drive engaged".

The 2 levers are mutually exclusive, in that only one of them can be shifted to a non-neutral position at a time. If the first one is in either the 540 or 1000, the second one cannot be shifted out of neutral, and if the second one is in the "ground drive engaged" position the first one cannot be shifted out of neutral.

When that first lever is in either the 540 or 1000 position, the handle on the right side of the dash works just like yours, pulling it out engages the PTO and pushing it in disengages it.
When the second lever is in the "ground drive engaged" position, the handle on the dash has no effect, and the PTO is driven off of a gear on the transmission output shaft, so the PTO speed varies depending on how fast the rear wheels are turning, hence the name "ground speed".

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pete black

04-28-2013 19:36:30

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 Re: Tractor Model in reply to Sean in PA, 04-28-2013 18:57:17  
thanks sean, not many sos in nw al. so i was not familiar with those models that had the 540/1000 rpm and ground speed. very good explanation.

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