Husqvarna Rider 155 Hydrostatic - will not move forward or backward?

Husqvarna Rider 155 - 2003/2004 purchased. Was mowing the lawn and the pedals stopped working. Mower would not move forward or backward. Don't know how to fix. Is there a schematic that shows me how all of the pieces fit together? Parts lists with diagrams have not helped me. I need to see how the pedals (speed limiter), cables, springs, connectors, pulleys, etc..... all connect.