The pto is turning when not on in my 5525 john deere

https://www.tractorbynet.com/forums/threads/deere-4400-pto-question.120738/ ---------in this link are 4400 manuals also

There are routine maintenance procedures for the steering actuators and filters. See the operators manual.

Manuals are available for download free of charge from the John Deere website.

https://techpubs.deere.com/en-US/Search/Equipment#

This may not be the problem but is a good place to start.

Try the following test. For safety purposes remove spark plugs. Now with engine off and key in run position turn PTO on. You should hear the clutch engage (clunk). Grab both sides of the clutch pulley and try to rotate the pulley. If the clutch is properly engaged you will not be able to rotate the clutch pulley without turning the engine.

ask here.

http://www.mytractorforum.com/12-john-deere-forum

http://www.tractorbynet.com/forums/john-deere

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Best Manuals

How To Replace John Deere PTO Clutch

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Here's the link and I'm sure you will get the solution of your problem.
5525 john deere

Probably......Your starter motor is jammed up or the solenoid. Oil and tap hammer the starter motor and gear to the flywheel to see if you can free it up. Otherwise disassemble the starter from the housing and see if the motor will spin when you put 12V to it

http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt?search=model&model=la105