[clark90]

I want to slow down my auger some to get rid of vibration. It currently runs at 580 rpm or 26% of engine speed. If I slow engine to 2000 (520 rpm unload speed) auger runs smoother. My question for the math heads, what size sprocket change do I need?

 

[mrgrothen]

Has your unloader suffered from vibration since it was new, or is this problem something that has been getting worse with use? Any problems with the universal joint, hanger bearing or torsion dampener in the swing auger? The reason I ask about use is it seems as flightings wear, they tend to become imbalanced. This is not just on combine harvesters but grain carts and truck augers as well. If it is getting worn, maybe a shop specializing in flighting balancing could tune it up a bit.

 

[clark90]

It is a since new problem, 150 sep hrs. I think they over sped the auger to get 4.5 bu. a sec out of it.

 

[mrgrothen]

Did a little checking and your right side unloader drive has a 42 tooth sprocket on the floor auger driven by a 24 tooth sprocket on the unloader countershaft. If my arithmetic is correct if you change the driver sprocket to a 21 tooth sprocket you should turn about 507 rpm. if you go to a 22 tooth sprocket that puts you up around 532 rpm. I noticed the 6 series must use a two groove belt drive system from the maindrive to the unload clutch and maybe the ratio has been changed over the 5 series to cause more speed though without some careful measuring, that is just speculative. I have not looked in my 5 series owners manual at the shaft speed diagram to see what the unloader was rated to turn back in 04'. I know the M11 was rated at 100 rpm less than the QSC but maybe belting differences made the mainshaft speed the same. Good luck

 

[silverluv]

I would not mess with slowing it down. The auger is probably tweaked a little or not balanced properly since new. Take it out and get it professionaly balanced and life should be good. I have had to do this to our a few times, it helps alot.