The little ratchet dog on the back left of the escalator may be your problem, see picture. This part gets hung up quite frequently and will jamb the escalator. If that is it, unscrew the shoulder screw release the part and just let it hang, put the shoulder screw back in. If that is not the problem, pull out the cotter pin from the arm that connects to the escalator, see picture, pull the spider dog, see picture, to the right, this will allow the spider gear to spin freely. If it does not spin freely, the problem might be a coin jam under the tin 2nd coin return chute on the front right of the escalator.
Watlingboy