I took the input shaft out of the upper gears case of my drive to get a better look at the gear wear (metal on both magnets). Is there a procedure to time the gears when reinstalling the shaft? Any help would be appriciated.

Pull the back cover off, line up the "+" on one gear with "-" on the other gear and make sure they stay in time as the input shaft goes in.

Thanks a bunch! It was a big help.