Re: Bang-Clank PTO

Posted by Dr. Evil on June 24, 2002 at 12:12:30 from (12.4.181.2):

In Reply to: Bang-Clank PTO posted by BTD on June 24, 2002 at 06:22:13:

I think what all these people are explaining is the "PHASE" the PTO shaft U-joints are in determines how smooth the U-Joints transmit power when the PTO shaft is running at an angle. The geometry of the u-joints cause them to accelerate and slow down the other end of the shaft from the driving source. Since the flywheel effect of the chopper blades prevents the blades from speeding up & slowing so fast the PTO drive train in Your tractor speeds up & slows down at a frequency WAY faster that it should... in effect Your hammering the daylights out of Your PTO. PTO shafts that have 3 U-joints are better than a 2 joint PTO... and the angles the U-jionts run at when turning should almost be identicle... If You chopper is a pull-type, the U-joint closest to the tractor will run about 3-4 times the angle of the one at the gearbox of the chopper. I've run over 1000's of acres with PTO choppers like that and You can not turn short with them. I used to pull a 6 ft. Brillion with a Super H.... about 1 turn of the steering wheel, maybe 1-1/2 turns was Max. was all the tighter I could turn.

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