Ok,Lets see if i can explain in terms that can be understood.The top shaft in the transmisson is hollow so that another shaft can be inserted through it.The shaft that runs inside the hollow shaft runs directly off the flywheel of the engine.It is splined into a drive hub that is bolted on in the center of the flywheel.The splines have worn out of this hub.When you say the tractor will try to move a little it means the shaft is trying to turn but can't because the splines are worn out of the hub.You must seperate the tractor between the engine and the transmisson.Then remove the clutch and pressure plate assembly.Now you will see the hub with the splined hole in the center.It is retained with six bolts.also look at the splines on the shaft.If you are lucky the shaft can be reused.If its worn badly replace it also.You have to remove the tranny from the rearend housing and remove the rear plate on the tranny to change the shaft.I've seen several 8600's do this over the years.Some did it at the tractor pulls.This problem was a poor design because of the fine splines on the shaft and hub.I assume you tractor has several hours of use on it.Most of them had this problem after hard use for several hundreds or thousands of hours.This is an easy fix if only the hub is replaced.However if the shaft needs replacing and its a cab tractor its a lot harder job.The hub should be reasonbly priced but,the shaft will be high.You might find a good shaft at a salvage yard.The shaft and hub drive the pump.Good Luck.
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