I have a friend with what sounds to me like a stuck clutch on his 424. He almost drove the tractor into his pond when the clutch would not release while he was brush hogging. (i.e. the tractor just kept driving on even though he had depressed the clutch and hit the brakes) They were in the process of taking the tractor to a mechanic to have it repaired. I have read where starting the tractor with the clutch depressed and chained to a tree or holding it with the brakes can sometimes if you are very lucky, break the clutch loose. I am not familiar with the 424 and as of yet, I have not been able to go look at the tractor. Is the clutch pressure plate bolts or clutch assemble accessible without splitting the tractor? I was thinking of possibly backing out the pressure plate bolts some to release some pressure and may trying to tap a really thin putty knife or similar tool in between the clutch and pressure plate if the above method does not work. Any of you have this problem before? If so, what did you do to fix it. Splitting the tractor is the last resort but sometimes that just has to be done. Any suggestions, comments, or ideas very welcome. They need to get the tractor running as they use it to maintain their dirt driveway.