Combines Raddle chain slip clutch slipping

Usually it's the idler bearings locking up at the lower front part of the raddle chain, just behind the clean out door, if it's an older conventional machine.

Had a similar happening on l2 2 yrs ago during harvest. Found that the unloading auger in grain bin, had worn holes in the bottom of the grain hopper, allowing clean grain to dribble back into the machine. While the combine was running, no problem, grain kept returning, but after stopping, raddle clutches would slip when we tried to start up again, since clean grain was accumulating in the clean out area. Apparently Gleaners are famous for eating themselves up at times.