Combines loud knock in shoe on l2

[tbran]

Yes, EVERTHING has to be right. Your banging indicates loose bearing flanges, incorrect rubber bushings, problems with the shaker pan underneath the walkers, bent_twisted eccentric shaft or some other thing I can't visualize at the moment. I have seen a torch taken to the sides of combines to prevent this banging. This is not the solution. It is not that the design has to be perfect to prevent banging, it has to be nearly perfect to lIVE. Each time the the shaker shoe and shaker pan cycle, there is a reversal of hundreds of pounds of mass. If this cycle is not a smooth acceleration and decelleration in a matter if hundreths of a second, sheetmetal fatigue WIll occur.

 

[ajco]

Mine had keyway in 1 shoe sprocket worn.

 

[Gleanerpilot]

K-stater, Check the nuts on the end of the rod that extends through the front of the shoe. The rubber bushings fit over the cast pieces that this rod runs through. If those nuts aren't TIGHT, you will have enough slop to allow the cast pieces to bang against the frame. I broke two rods in my l before I figured out what was happening. The nuts worked loose, I heard the banging, but before I could figure out what was going on, I broke that rod. Make sure you check both ends, not just the left side, which is easy to get to. The right side will be in under the clean grain elevator. Good luck!

 

[T__langan]

tbran - you mentioned "a reversal of hundreds of pounds of mass". Methinks you are slipping a bit, my friend! There was a perfect opportunity to relate this to watching your MIl do the "locomotion" and you missed it! Tom langan

 

[husker_gleaner]

Sounds like the castpieces are hitting the frame.They make one heck of a noise at full throtle that is where I would look first.

 

[K_stater]

Thanks - the cast pieces were hitting the frame - we had originally put the impact on the rod nuts but probably it was turning on the other side of the machine and didn't get tight enough. I replaced the bearings anyhow since they were very bad, and tightened the nuts with a backup on the other end of the rod. Works good now!

 

[Gleanerpilot]

K-stater, Thanks for the follow-up. Glad to be of assistance. Things like that can drive you up the wall until you realize what's going on, and how simple the fix is! Gleanerpilot

 

[Tom_Russell]

Good one Tom. You definitely have recuperated from the stress of planting this years crop.