c1137 code on a fs 524 help

we got this machine in freight today. copier works great. the finisher just codes out. I have it apart and see what its trying to do. the little black gear is spinning and it gets stuck out of position because of the flag on the gear. this is the gear that moves the guides up and down.. any thoughts on this problem? c1137

this fits on the bizhub 601

thanks
brent