I have a 2006 Cub Cadet Zero Turn 50" deck. While recently mowing, the the deck belt broke. After purchasing a belt and replacing it, now the PTO will not engage. when I pull the switch, it makes a brief chriping sound and that's it. I am not a lawn mower mechanic by no means, and do not have a lot of knowledge on this model, but can follow basic troubleshooting procedures. Any advice. Thanks.