If this occurs when you are running an implement like a rotary cutter that is powered by the PTO, you need to install an over-running clutch on the pto output shaft. These are designed to stop the continuation of forward motion when you disengage the clutch and want to stop the tractor.

See the below link and scroll to the bottom, you'll see several overiding/overunning clutches.
PTO Overiding Clutch
 
Your clutch disc is stuck to either the flywheel or pressure plate.
Common problem on these older Fords. Usually caused by leaking rear main seal or front transmission seal that get oil on the disc and gums things together.
Get it out in the open somewhere and get the tractor warmed up good.
Then put it in 4th - about half throttle.
Push the clutch pedal down and hold it down.
Then hit the brakes HARD a few times.
That will usually free it up.
In the future when you park the tractor for more than a few hours block the clutch pedal down with a 2x4, clamp, rope, or whatever so it stays disengaged. You can do that for years and years with no ill effects on the clutch.
The alternative to blocking it down is to remove the engine from the tractor so you can renew the clutch and seals.
 
Okay. I am a beginner at this. At the end of each override clutch, is the warning ". The use of PTO adapters can be hazardous if not used with adequate protection such that ASABE standard S318.16 requires suitable shielding be provided "for any device intended for installation between the tractor PTO shaft and the implement input driveline". (Part No: C690F). I have no idea what this even is. Thanks.
 

As with about Anything....there are trade-offs...

The "Over-running Clutch" ( Sprag Clutch) is only a ONE-WAY Driver for the PTO...

IF you Need to Stop, you can
an easily...BUT the Bush Hog will KEEP ON COASTING for a very long time,,

MYSELF, i prefer NOT to use one....partly because i LEARNED to with tractors with NO "live" PTO..BUT..

What I have learned is that it is BETTER to close the throttle and Hold the Brakes as much as you can ( even with a "Live PTO"), to slow the Bush Hog ( or what ever) and stop it if possible as you stop..

If it is too much of an emergency, yes, you can "Clutch" the tractor and Stop..even if the Mower is left whirling for 30 seconds or more ...which I definitely avoid..
 
That is a reference standard, and like most you have to pay to get a copy of it. In layman's terms, it means that all parts of the spinning pto shaft need to be shielded. An un-shielded PTO shaft or any similar spinning part can easily catch onto clothing and wrap a person up, pull their clothing off, pull off extremities, kill or maim. Spinning PTO shafts are to be avoided at a safe distance. On a newer tractor, the output shaft on the back of the tractor should have a shield, the shaft from the implement should have a shield, both to prevent the above.
 
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