Posted by mkirsch on December 03, 2008 at 11:23:46 from (64.80.108.56):
In Reply to: mowing with an H posted by Jack OH on November 28, 2008 at 09:01:50:
Gene, while I can't speak for combines, PTO balers and forage harvesters have overrunning clutches built into them.
On a baler, it's in the flywheel, and on a forage harvester, it's on the knife drum.
With haybines and combines, there's aren't any large flywheels, knife drums, or large blower fans that carry lots of momentum. Plus there's enough drag in the system that the machinery stops fairly quickly... The PTO shaft twisted off on the haybine when I was cutting earlier this summer. It stopped dead quicker than I could blink. No way would it push an M more than a few inches.
Without the overrunning clutch, you could do some serious damage to the tractor if you jumped on the clutch and brakes in a panic and managed to lock the wheels. We've still got the original PTO shaft from the M... The splines on the front of the shaft look like an inside-out rifle barrel, twisted almost halfway around. I'll have to ask Dad if he remembers what happened, or if that was how the tractor was when he bought it. All I remember is going to a dealer about an hour's drive away and pulling the shaft off a parts M they had on the lot. Had to be over 30 years ago.
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