Welcome to the wonderful world of Hydrostatic transmissions! I bought a new Craftsman, DYT 4000, in 2004 and thought I died and went to heaven. The neighbor was grinding and clunking gears in his John Dear manual transmission while I was driving my mower with one hand and enjoying a brewski with the other. I would run the thing full bore up and down my acre and one half lot and could care less about changing oil in the tranny. One day while driving up a hill and laughing at my neighbor who has been grinding gears in his JD my tranny for years, my tranny stopped working. I pushed my mower to the shed and noticing my neighbor laughing at me while he continued to grind his gears. 800 hard earned dollars and two weeks later I mowed my now very high lawn.....yes, my neighbor was still grinding gears but he didn't miss a beat mowing his now neat and tidy lawn...good luck my friend!