My friend has a zero turn 50" cub cadet 22hp that is about 5yrs old he is having a problem when he is mowing forward it just stops pulling but it will run in reverse just fine and if he turns left or right and then pushes forward it moves foreward again what could cause this? Also when he turns off the key only one cylinder is all that seems to turn off. He has it in a shop that I personally dont trust we would like to see what other people says about this problem. he dosent remember what the mod. no.is but can go get it if needed.