I have a new CC Z Force L 54. When I pull the steering bars back the PTO shuts off the blades as it should, but when I go forward after that the blades do not start turning/cutting again. (My 2007 Z Force 50 starts back when I move forward.) The manual says it should start back when one or both of the lap bars are moved forward. I have to manually push down the electric PTO button & pull it back up every time to restart the blades.