7720 Dual Speed cylinder Drive

gostate

Member
I have a 7720 parts machine with the dual speed cylinder drive. Is it feasible to put it on an older 7720 that does not have it? Is it worth the trouble?
 
Mainly depends if you need slow speeds for dry corn ect. If not I wouldn't bother. Just something more to rebuild/fix when is breaks down or leaks.
 
I would tend to agree with what Scott wrote. In our corn and soybean operation, the single speed cylinder drive on the 7700 was quite adequate for both crops.
 
If memory serves me right I think you have to switch out the cylinder shaft as well as the outside parts. While not insurmountable it would be a pretty good project. I once had a 7720 without the dual range drive and never saw a lot of need for it unless the cylinder speed was toward the low setting. The lack of belt contact with the bottom sheave would allow some slippage when the speed was in the extreme low setting which was more common with dry corn. Mike
 
The fellows below are in error as to the reason for the two speed drive. The single speed drive cylinder is limited on the top end speed which is used for small grains like wheat. IF your running corn and soybeans the single drive really was not much of a problem. To change the drive you would need to change the complete drive and cylinder shaft. This is the one that goes through the cylinder. I also think the drive sheave is different too. It would be a lot of work. I could be done but would not be a simple project.
 

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