Pto doesnt disengage mf 253

[mhudgins]

My 253 massey pto doesnt engage. When using a rotary cutter it doesnt spin but when hooked to a hay rake it will spin slowly when lever is in disengaged position. With tractor idling it spins and cant stop it with a gloved hand. With tractor off shaft spins freely. My service manual shows a brake on the independent pto clutch that wears out, however when I took my lift cover off mine is different than my manual and I have a disk behind my clutch pack that has a lever that is activated by a valve when lever is in off position. Everything works smoothly , so I changed a o-ring out and greased it and put it back together but still is spinning when disengaged.
Any suggestions
Thanks in advance

 

[Jim.ME]

You could have an internal issue in the PTO clutch pack (warped discs, broken spring, etc,). What fluid are you using in it?

 

[bentrims]

According to www.agcopartsbooks.com the PTO uses a multi disc wet clutch and had a separate brake disc. With the PTO not stopping as you have explained I would suspect the clutch plates in the clutch are warped and need replaced. This could be verified by attempting to turn the PTO shaft with the engine off.

 

[mhudgins]

Spins freely with engine off
I am thinking when you disengage there is pressure put on that arm that touches that brake disk
I am going to check and see if I have any or enough pressure for that