Buddy loaned me a rotary cutter that has a slightly twisted PTO shaft. I have a new tube to replace the twisted part but not the time to fix it properly right now. He said if we run it as is the U joints will be out of time... My question is what kind of issues would I have if I went ahead and used it as is to cut about 1/4 acre. Would you or wouldn't you?
- Thread starter BobReeves
- Start date
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
Technically amount of angle u-joints are operated at & degree pf the twist in driveshaft will affect amount of vibration. If twisted driveshaft is operated with u-joints at equal height IE straight in line there should be little if any vibration. Twisted driveline may be more difficult to telescope in/out. Triangular driveshafts are normally not very difficult to replace twisted parts with new non twisted parts.
RobCons
Well-known Member
- Location
- Central Alabama
I would fix it. Vibrations are not good. If its twisted it may twist even more rather easily so it will not telescope in and out. If it doesnt slide like its supposed to the pto system on the tractor can be damaged by the pressure applied to it.
Janicholson
Well-known Member
I agree, and it is likely to vibrate unless the shaft is almost straight in operation with a mounted cutter, it might be OK. with a trailing
cutter I would not do it. Remember the vibration is in rotation, not balance. this affects gear strain in both directions, in the shaft toward
the cutter, and forward into the tractors PTO drive!. Jim
cutter I would not do it. Remember the vibration is in rotation, not balance. this affects gear strain in both directions, in the shaft toward
the cutter, and forward into the tractors PTO drive!. Jim
Stephen Newell
Well-known Member
I wouldn't use it until you fix it properly. The vibration will wear out the bearings on the PTO and the implement you use.
caterpillar guy
Well-known Member
If it will still slide to telescope for attaching to the tractor it can't be much of a twist. I would run it then fix. If you just change the tube the shaft more than likely will not slide on it unless you change the shaft too.
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
Not necessarily "lack of" but could also be lack of "correct operating" IE not stuck & correctly adjusted slip clutch or shear bolt
Mike(NEOhio)
Well-known Member
- Location
- Newbury, Ohio
My question would be why he lends it to you and says not to use it as is. Is he looking for a free repair job, part and labor? That said, it would probably be OK for a small amount of light cutting. Depends on how good a "buddy" he is.
wore out
Well-known Member
I would worry more about the shaft binding so that it can't easily telescope in and out as needed, especially during turns (if a pull-type cutter) or while raising and lowering (if a 3-point unit).
That's TOUGH on on bearings and snap rings that hold the tractor or cutter gearbox shafts in place.
If there's no issue with it telescoping it will be OK running a few degrees "out of phase".
I've seen machines with the drivelines 90 out of phase that have been run for YEARS like that. NOT a good idea, but some operators are CLUELESS!
buickanddeere
Well-known Member
Cheaper to go to TSC and pickup a next heavier PTO shaft . Grade 6 is the heaviest 540 rpm shaft iirc.
Brendon-KS
Well-known Member
- Location
- Goessel, KS
I completely agree with what you stated - I believe the danger of binding is a far greater concern than a few degrees of twist throwing the u-joints out of time.
buickanddeere
Well-known Member
Cheaper than the damage caused by vibration and excess linear thrust on the mower gearbox and tractor PTO stub shaft. Cheaper than wasting time fooling around with a twisted shaft that can not be truly nor accurately straightened.
he objective here may be to hope the problem can be talked away. One of the first responders asked as did another later, "how bad is the vibration?" Hook it up, start it up and report back. Does it blurr your vision? Make you sick at your stomach? Can't tell difference whether PTO engaged or not? Quantify if between.
buickanddeere
Well-known Member
Replace the PTO shaft
showcrop
Well-known Member
Or JMOR, the objective could be in that old adage "If it ain't broke then fix it until it is broke". I have better things to do myself, as I think most other people do than to go after a problem that you have to look hard to find and doesn't effect performance. I suppose it could cause readers to get the impression that everything that you have if not under two years old is maintained well enough that no one could tell that it is over a week old.
buickanddeere
Well-known Member
What is the definition of acceptable twist ?
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