SOS Problem - PTO will not disengage

[sixbales]

A friend of mine has a 1963 ford 4000 with the select-o-speed transmission and approx 2600 hours on it. When he first got it the PTO would engage and disengage with the pull out knob next to the sos control. Now the pto will not disengage with that knob or when the clutch is depressed.

I know nothing about SOS operations, but I know some of y'all do. Is this an adjustment problem or worse??

 

[Dean]

Does it "disengage" when the knob is fully inward and the PTO has a load on it?

Dean

 

[Sean in PA]

The pedal that looks like a clutch pedal on an S-O-S tractor is called the inching pedal, and it has nothing to do with the PTO. The PTO on the S-O-S models is called "independent" for a reason, it operates completely independent of the rest of the transmission. The only thing that controls it is the PTO handle next to the gear selector lever on the dash board.

The PTO is driven from a separate clutch inside the transmission that does not have a brake, so it relies on lack of any impetus to continue moving as the means to "stop" it when you push the handle in to stop it. If there's no implement attached to the PTO, most of them will continue to turn, but without any real power behind the movement, and if you have a brush hog or other heavy implement attached, it will stop. If you don't have an implement attached, you can test it by pressing a 2x4 or 2x6 against the side of the PTO shaft to see if that stops it. If it stops with an implement or from the 2x, then it's fine. If it still runs with power behind it such that the implement won't stop running or the 2x won't stop it, the first thing that you should do is get a service manual and follow the instructions in there to adjust the PTO control handle cable, and if that doesn't fix it then splitting the tractor and seeing what that clutch needs is the only thing that can be done. Keep in mind that some parts are no longer available. Mine has turned with power since I got the tractor and since I only use it for brush hog work, I haven't bothered to tear into it. I just disconnect the PTO shaft when I'm not using the brush hog, and connect it when I want to use it.

 

[sixbales]

He had a flail mower attached to it, and ran it a few times, and the PTO would engage and disengage with knob.

Now the PTO will no longer disengage with the knob.

 

[nw_bearcat]

May have just loosened up the mower. Mine rarely stops spinning when lifted, but stops when hits grass

 

[sixbales]

Thanks guys for your help!! Greatly appreciated!!

 

[sixbales]

Thanks guys for your help!! Very useful and greatly appreciated!!