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Implement Alley Discussion Forum

shorten a pto shaft??

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rick call

07-12-2006 14:41:58




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Has anyone ever shortened a PTO driveshaft? Is there any pros or cons to it ? Would it be the same as shortening a driveshaft? cut, weld ? thanks!




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Chick

07-14-2006 05:31:57




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 Re: shorten a pto shaft?? in reply to rick call, 07-12-2006 14:41:58  
When I worked at the MF dealership, we madea jig out of 2 pieces of angle iron, with brackets on each piece, that held 2 long bots with wing nuts on them. Before cutting the round tube with a pipe cutter, we would mark a straight line along the side of the tube. Then we would place the 2 pieces of tube, in the angle iron jig, tighten with the bolts/wingnuts (which held the pipe perfectly straight, then tack welded on each side, loosened the jig and rotated it 90 degrees on the pipe, tightened and tack welded the tube again. After removeing the jig, you could weld the whole tube. This not only kept the pipe straight, but kept the u-joint yoke in the correct position.

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RodInNS

07-13-2006 09:24:49




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 Re: shorten a pto shaft?? in reply to rick call, 07-12-2006 14:41:58  
The answer depends entirely upon what type of shaft you're dealing with. If you have the old style shaft with the square/rectangular bar and round tube, then you do as old has suggested. I generally cut the adapter out of the shaft at the weld, shorten the tube, and then weld the adapter back in, minding the phasing. Or you can do it exactly like old said. Doesn't really matter, so long as the tube is welded to the yolk. I believe there are also some of those shafts that are square formed the full length. You'll just have to look. If that's the case, then you can just lop a piece off the end. Also remember to shorten the bar by a corresponding amount, or enough so that it slides into the tube fully. That should cover the square shafts.
There is also the metric shafts like WalterSchied and Bondolini & Pavesi That use full length formed tubes. With those you just lop the ends off to the length you need. Very simple, quick and easy.
John Deere had a habit of using another variation of the bar/tube arrangment like mentioned first. These had a splined bar, and then a tube adapter, often with ball bearings inside the adapter. Those devils were dealt with in the same manner as the square shafts. There could be more types out there that I'm not aware of either, but those are the types I've seen. HTH.

Rod

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Leroy

07-13-2006 06:01:11




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 Re: shorten a pto shaft?? in reply to rick call, 07-12-2006 14:41:58  
There are 3, maby more, types of pto shaft. first is just a square or rectangular shaft that slides in a matching tube, second is the first only adding a round, supposed to be able to turn, tube over the square part, this type does not require a seperate safty cover, the first and third types require that seperate safty cover. The first and second types are slide adjustable for length, the third type is not adjustable and is like that truck drive shaft, a large round tube with both ends welded solid and with no safty sheilding, the last type is use on a 3 universal joint PTO with a front mount bearing and the length adjustment is betweer the machine and the front mount bearing, the first to types can be used on only a 2 joint PTO shaft or a 3 joint PTO shaft with a rigid mount front bearing and the length adjustmeny is in the front part of shaft unlike the other type that the length adjustment is in the rear part of the shaft. He does not say what type of shaft he has so impossible to tell how to shorten it. on some of the sliding type units the tube can just be cut off, others a center piece can be cut out and rewelded and some cannot be shortened at all, depends on type of shaft and location-use

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Luke S

07-12-2006 16:05:06




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 Re: shorten a pto shaft?? in reply to rick call, 07-12-2006 14:41:58  
Maybe I am just stupid(highly possible), but I always just pulled the two ends apart and trimmed some from each end of the shaft with a good ol saw-zaw until I reached the desired length. Always has worked for me? But maybe I don't understand what you guys are talking about?



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IaGary

07-12-2006 19:18:15




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 Re: shorten a pto shaft?? in reply to Luke S, 07-12-2006 16:05:06  
Luke I agree with you.

Ive shorten two or three like you say.

Just remember you have to take some off of both halfs.

Chop saw with file to clean off the burrs and your done.



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paul

07-12-2006 22:44:01




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 Re: shorten a pto shaft?? in reply to IaGary, 07-12-2006 19:18:15  
Yea, just cut both sides, donm't understand the welding thing?

Some few shafts have a small bit of square welded to the end of a round tube, perhaps these are the type one needs to cut & reweld?

--->Paul



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Blue Buddy

07-12-2006 15:43:29




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 Re: shorten a pto shaft?? in reply to rick call, 07-12-2006 14:41:58  
we do a lot of this at our shop, as well as lengthen and replace tubes and shafts, even do those dang 3 lobed new fangled metric things Old has got the plan, but a couple things to keep in mind, if you cut the end off, then shorten the tube and weld on, try to get straight, but it HAS to be in phase, so mark the tube and end before you cut it, and get it on right, wrong and it will chatter and wear stuff pretty quik, in phase means the yoke ears on both ends of the same chunk of shaft (including the telescoping part) have to face the same way, so, if there was no cross in it and you laid it flat on the bench, both sets of ears are matching, not 90 degrees out, has to do with how the knuckles move as the shaft rotates, and that way the telescoping part is not trying to move as the knuckles go around, and if ya cut the square shaft to fit, the real square ones have a bump on one side so it will only go in the tube one way to keep them in phase, quik spot with the welder puts one back on easy

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old

07-12-2006 14:54:53




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 Re: shorten a pto shaft?? in reply to rick call, 07-12-2006 14:41:58  
Well the easy way to do it is to take the one end off, cut the tube and then weld the end back on. I've done it more then once



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rick call

07-12-2006 15:26:11




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 Re: shorten a pto shaft?? in reply to old, 07-12-2006 14:54:53  
Thanks!! just wanted to know so I didnt mess up!!



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old

07-12-2006 16:20:30




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 Re: shorten a pto shaft?? in reply to rick call, 07-12-2006 15:26:11  
When you take that end off don't just cut it off like with a chop saw or you will cut off the callor that the tube fits on and then you will need a new end. You need to grind off the old weld and then brake the tube free cut it how ever long you need it and then slip it back on and reweld. Also be sure to keep the U joints in time or you will have problems



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