Hi, I recently bought a second hand John deere STX38 yellow deck. The mower was still going very well with just the brakes not working well. Then I had to replace the breather hose because it broke. This left the mower sitting for about 4 weeks as we waited for it. We finally got the hose, replaced it. Now the mower starts, the engine goes but I can't get it into gear at all. I have no experience with mowers. Any help at all is very much appreciated.