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Ford Tractors Discussion Forum
Show Parts for Model:

Re: Select-O-Speed (SOS) Quick ID, ORC vs DDC

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Sean in PA

04-11-2013 18:27:54
71.224.102.32



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It is my understanding that an overrunning clutch only "grabs" in one direction, sort of like a ratchet, so when the tractor's going down a hill it can go faster than the engine would be driving it on flat ground at a given rpm, which can lead to a runaway situation on a steep hill. The ORC S-O-S transmissions would still limit forward speed on a downhill in certain gears because the ORC only came into play when the number one servo was in one of two possible states. Someone else will probably chime in with the info on whether it would overrun when the number 1 servo was pressurized or whether it was when it was not pressurized, but I haven't memorized that part of the design.

A direct drive clutch is just that, direct, like a standard manual transmission clutch, so when it's engaged the engine will not only drive it forward, it will also limit the forward speed in a down hill situation.

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jeff pk

04-12-2013 09:44:21
50.39.128.154



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 Re: Select-O-Speed (SOS) Quick ID, ORC vs DDC in reply to Sean in PA, 04-11-2013 18:27:54  
Thanks for that explanation Sean. I have the ORC and many steep hills here so you may have just saved my life...



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