Hi Greg,
Pull the inspection cover off and you will see there are two shafts in the front of the transmission case. The upper one is the power shaft(clutch shaft)in, the lower one is power out to the hydraulic pump. Chances are one or both are shot. You will have to pull the cotter keys out of the sleeves on the hyd. pump drive shaft and drop the short shaft segment out, then you can get a light up there for a good look-see. The yoke on the trans shaft unscrews, and then you can get to the seal and bearing easily. If it's the upper you will have to unbolt the yoke and split the tractor between the trans. and the clutch housing far enough that you can get the bearing holder off. Those seals are fairly common items--got mine from a bearing jobber, or CaseIH can order them for you... Good luck
Wes