Help identifying PTO

I got the brakes all done, the shaft seal replaced. I drained the gear oil out last night. Today, I pulled the PTO cover off. I like how they use orings on alot of stuff. They are cheaper then new gaskets.
Anywways, I pulled the pto cover off to check out the bull gears and see what kind of pto its geared for. There is a spline shaft all the way up in the front of the case, about an arm's length up. I'm assuming this is the pto drive. Now, that shaft can be easily turned no matter what the clutch position is, and no matter what gear its in including neutral. I'm wondering what the deal is since its supposivley gear for an IPTO.

AHH!!! I see...
The seasonal disconnect must be disabling that shaft... I noticed it on the pto drawings... Now How to enable it to check the shaft? Its got a center"bolt" with a bar going on top of the head? The manual mentions nothing of a seasonal disconnect. Can someone explain how to engage it?

Also, the bull gears, and dif bevel gears are in AWESOME shape. Very defined gear teeth, like they were machined yesterday. No sharp edges like one would see with wear, just very nice defined teeth edges. I guess with this and the clutch that is rather worn, it further verifies this tractors use as a loader tractor for most of its life. Whether thats a good or bad thing, I dont know, the front end is tight, so that is good.

Thanks Guys.

If your constant mesh gear and countershaft are turning with the clutch disengaged, it is probably due to the pilot bearing which located at the center of the flywheel. The bearing is supposed to be permanently lubed but fifty years stretches the concept of permanent when it comes to machinery. You have already indicated that you don't have much clutch facing left. While the facing was being eroded your bearing was also spinning. The inner and out race were moving at different speeds and probably in the presense of considerable heat. The pilot bearing can get so bad that eventually you will have to shift gears with the motor turned off unless you become expert with the simultaneous use of the throttle and shift lever.