Okay, more info. Plan A was a new-to-us tractor to pull the bean planter so that we could run both planters at once. Long story, but that didn't happen. So the new-to-us planter is now firmly attached to the old-to-us tractor. We will see whether the issue persists...or whether it's different with the other planter. With the rain, that will have to wait until next week.