Deutz D7807C PTO no disengage and ?

I use my Deutz for raking hay 99% of the time. It stays hooked to the rake all year. I was raking the last bit of hay and noted a loud whine coming from the area near the hydraulic receptacles. I stopped immediately and checked for a broken hose or massive leak suspecting the whine was the pump low on fluid. Reservoir was full no leaks. I engaged the PTO and the noise quit so I finished raking hay and drove it back to the house. I took the rake off and hooked up my 16 foot batwing bush hog and discovered upon engine start that the PTO was engaged with the handle selected to disengaged and the loud whine was back. I engaged the PTO and the noise went away. I bushogged 10 acres and other than not being able to disengage the PTO everything operated normally. I unhooked the bush hog and put the tractor in the lean to off of my corn crib where it spends the winter. I verified the linkage is moving. Can anyone shed light on this? I have three other tractors and ordinarily don't use the Deutz for anything but raking hay and my rake doesn't need PTO so it won't affect my operation but I am curious as to what happened and don't want to hurt the tractor.
In my quest to figure out the noise I also discovered a handle on the back of the tractor just above the hydraulic reservoir and dipstick that I have no idea what it is for? I tried to move it and it didnt move? I will take a picture of the handle tomorrow and post it. Anybody here have any ideas? Thank you all in advance. I figured since it is now Deutz Allis it would be OK to pose this query here...

I also need to note that pushing in the clutch which should disengage the PTO and it does not?

Did you check the level of the transmission oil? My 7806 has a fitting in the floor by my left foot with a dip stick to check the level of 90 weight. The sound you describe sounds like an unlubricated bearing.

I will look tomorrow. I don't know. Thank you...

I dont recall seeing a dipstick thats not to say there isnt one there. I have owned the tractor since 2012 when Daddy passed and assumed that the hydraulic oil was what lubricated the transmission like on my 6400 John Deere. Now I feel.stupid. I will check it out in detail tomorrow and report back. Thanks again.

PTO clutch disc /PTO throw out bearing failure.

Thanks. We are thinking some kind of failure as well. I will check the transmission once I find the dipstick.

I have owned several Deutz tractors. A Deutz-Fahr D3.5 and a Deutz-Allis 6275

It has a two stage clutch setup. The PTO is not operated by the foot clutch but a separate lever. Then you have another lever that operates a sliding gear/dog that disengages the rear PTO shaft. So when your not using the PTO your supposed to disengage the rear shaft with the selector lever.( usually a smaller lever between your legs by the gear shifters or behind them by your left heal) Then engage the PTO clutch with the Independent control lever. (Usually on your left side, out by the fender. Mine looked like a parking brake lever. Your could be on the left side of the dash too) Your not supposed to run with the independent control lever disengaged position all of the time. IF you have been running it with the independent control lever disengage all the time you more than likely locked up the bearing on the PTO clutch pack.

The Deutz tractors are a great tractor BUTTTTTTT the controls are different than your US tractors. You really need to get an operators manual and makes sure your not damaging the tractor by operating things wrong. Two examples would be running the rear end out of gear oil if not checked or ruining the PTO clutch pack by not operating it correctly. Not trying to be harsh but a manual would be cheaper than a repair on this tractor. Deutz parts are not cheap these days.
Deutzz D7807 manual 47.99

Thanks for the education. I will investigate further.

Is the Deutz a Fiat tractor like the 6000 series Allis? The Fiat uses a dual clutch system and you want to
run it engaged, you disengage the PTO with the 2nd gear lever. Get the operator's manual, they are
expensive to fix.

Bill