Thanks for the info.  I have ordered a repair manual for this tractor.  I have used the tractor for many years but haven't had to do much other than change the oil and grease it.  I have repaired the steering box a number of times.  It has a front end loader which puts alot of stress on the steering.  I finally built a ballast box for the back end to take some wieght off the front.  I think I will need to do something with the brakes soon.  I'm unfamiliar with the PTO clutch.  The PTO turns all the time.  I know there is supposed to be a way to disengage it but I've actually never used it.  Any advice.