Well, working on my 3rd year and and just ran into my first problem...
After mowing my lawn Thursday evening, I typically pull into a natural area in my backyard and blow down my mower. Upon re-start all I got was a click with a brief buzz/hum. First thought is battery. Get tester and determine battery isn't terrible, but under load I can tell it is probably time for a new battery. This morning went to LOWE's and bought a battery. After installing battery, I got a LOUDER click and a MORE DEFINED buzz/hum!! Next step I decided to investigate the starter....
My RZT50 has the Kawasaki motor (22HP). I removed the top cover. Once the top cover is removed, you actually expose the flywheel and the top of the starter. My problem became obvious! The nut at the top/end of the starter shaft had come off. The nut, washer, spring retainer, spring, and starter gear were sitting on the frame. All the parts were there, just not attached. I removed the starter from the engine and re-installed all the parts. Luckily nothing appeared to be damaged and the starter shaft still spun freely. So I re-installed the starter assembly and hooked all the electrical connections back up. Turned the key and the starter engaged the flywheel, but I didn't let it start. Went ahead and put the cover back on. Jumped in the seat and she fired up and ran like a champ! It was time to breath again!
I don't know if this is a typical issue with this type of starter, but I would recommend removing the main cover and checking that the nut at the top of your starter shaft is tight! I was lucky....all the parts were still there, and nothing was damaged!
I am still very pleased with my Cub Cadet RZT50! If it is 3 more years until my next "issue" then I will happy!
