Combines Bent cylinder shaft

If the shaft is bent full length, consider that there's going to be a fairly large arch in the center which will prevent proper concave adjustment and will probably require fairly large counterwights opposite the bend for balance. likely will destroy bearings pretty quickly, as well. In the other case, assuming it's only bent on the drive end, consider how much the driven pulley will wobble. When you're operating at slower cylinder speeds with the drive belt toward the outer periphery of the pulley, the drive belt will wear_split pretty quickly, and the higher torque will probably increase the bending. Hope this is clear.

what bent the shaft... any bend is not good where is it bent i am picking at the drive end have a look and you will most likely find the boss in the cylinder has cracked or come away welded my 9610 up two days ago get a good warranty of the dealer like at least a season first start up will tell with a vibration also check you can adjust the concave up tight good luck

here is what happened on my 7720,I bought this combine 5 years ago.at the time it had a very slight wobble on the pulley.last year it broke,quite a job to take out cylinder shaft.When we got it apart we found rust where the shaft had been broke,it ran for five years that way,it got so the grease fitting would not take grease on the pulley side,probably from wobbling around a little.So you be the judge,it might last forever or might quit tomorrow.have the dealer at least throw in a new shaft,you will still have to change it someday and at least you will have it.

My CTS2 combine was discovered to have a bent cylinder shaft when it was in for a green light inspection. The mechanic noticed a vibration. The JD book tells the mechanics how to check if the vibration is serious and when it should be fixed. In my case it was recommended to be changed. The front tire has to come off the combine and cylinder gets blocked up and the shaft just slides out and the new one slides in. It is not a real hard thing to change. Mechanics thought that bent shafts were more common in cts type combines because the concaves are open so much wider that when you hit a wad it gets stuck further in under the cylinder.

If I am not mistaken I think the JD tech manuel allows for some runout as being normal -you might want to ask to see your dealers tech manual in the section about the threshing cylinder and check it out.