You can tell if the problem is there at the coupling or to front or rear of tractor. The PTO drive shaft is split under the plate. There's a solid coupling(more common on later 400) or the seasonal disconnect that has jaws that lock or unlock if shift lever is moved to disconect position. I didn't think about the diesel when I said see if the shaft stops turning under load. wouldn't want to try running it with oil drained down but a short time. If you could turn the pto shaft with pto in gear and engine stopped and get something to fail before the engine turns it would be easier to find. Could also remove the bottom front cover on center housing and listen for noise at the splines Jim N. posted about. If problems in the pto drive train , some problems can be going toward engine from the disconect opening is the bolt getting loose that holds pto gear on the front lower shaft leading to failure. Bearing going bad on the shaft and letting gear drop. Gears failing or the splines that drive the top IPTO gear and shaft failing at the pressure plate. If the problem is just at the pressure plate and splines the tractor just has to be split at rear of engine to repair. Other things will require 2 splits unless the problems back at the pto. Another thing you can check with a helper before removing parts, but will have oil loss, is remove the drain plug in the bathtub shaped cover. second cover back on the bottom of center housing. Stick a stiff plastic tie in untill you feel the gear teeth hitting it and then see if it stops turning. Also the complete cover can be removed to observe the pto drive gears. Top cover on housing can also be removed also to observe gears. But if you can tell the problem is the drive splines at clutch by removing the dry compartment cover under the clutch, repair can be made without draining any transmission oil.
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