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Discussion Forum
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Re: ford 871

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Author 
Bern

06-08-1999 17:22:38




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Two important things about an SOS PTO that you need to keep in mind. (1)- there is no PTO brake on this tractor.The shaft will spin 99% of the time no matter what you do. (2)- the cable adjustment for the PTO is VERY critical. It sounds like initially it was adjusted such that the control valve for the PTO clutch was in the feathering posistion. Now it sounds like you've adjusted it so far in the opposite direction that you have virtually no control valve engagement.
To check for proper adjustment, with the control knob pulled all the way out, unscrew the fitting at the trans cover. While holding control handle all the way out with one hand, pull up on the conduit with the other. There should be a slight separation of approx 1/16 to 1/8 inch between the conduit and the flare fitting. Screw cable in out out as necessary to achieve this. Also check the total travel of the handle between full in and full out (after you have reconnected the fitting at the trans cover). This measurement should be approx 1 3/8". Be very certain of your findings here when you do this. Incorrect adjustment of the cable will likely lead to clutch pack slippage under load and consequently burn up the clutch, if this hasn't happened already. If the clutch pack is already partially damaged (i.e. warped plates), no amount of adjustment will stop it. If the clutch pack is not damaged, even a proper adjustment usually won't stop it, however any attached implement should. P.S. I'm not positive on the 1 3/8 measurement, but it should be very close. It should end up being slightly less than the total travel of the handle when the cable is not inserted into the shift cover.

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