If you only have one combine, using it to harvest beans for a week or two means other crops are not getting harvested. A SUND pickup will make picking up the windrow much easier. A flex header can also be used for direct harvesting beans. The third type of bean combine is a modified conventional combine, which is set up exclusively for beans. This machine should comfortably combine 40 acres a day, once modified.
Modification starts with replacing the rasp bar cylinder with a spike tooth cylinder.
This provides gentle separation of the seed from the pod. The cylinder drive pulley should also be changed to allow for slower rpm's. Install screens at every possible location. The main function of the screen is to allow for as much dirt and foreign material as possible to shake out. The best place to start is in front of the cylinder, under the feeder.