Hello: I was recently given an older John Deere Z225A zero turn mower. It was running great. I put a new battery in it as the previous owner said it wouldn't start it. Now when I went to start it, the starter would spin when the key is turned, but will not engage the flywheel. I did just replaced the starter and the solinoid with brand new ones. Same problem. I don't have a service manual or schematic on the wiring. Cant see spending a $100 on a manual. Can anyone offer some insight