In the Mb1000 is a clutch, with which you can open/close two power lines. You can work with each one independent, so you can start/stop PTO during driving or start/stop driving during PTO-work.
You open/close the driving clutch with a special hydraulic system. The clutch for PTO you open/close with air pressure.
From the dual clutch you have two shafts going into the gearbox. (One shaft is inside the other one...)
On the pictures you can see the dual clutch on the engine and the gear box with the shafts.
At the gearbox-picture you also can see the mechanic for opening/closing the clutches. Could be possible that it´s a bit different to the Mb1000. This pictures are from an 800 from 1976. This machine is mechanic/pneumatic - controlled (not hydraulic/pneumatic)
So, I hope I was able to help you?
Where are you from?
Greetings
Cliff
Trac - warum mehr wollen? Da war doch was mit dem Sinn des Lebens???
Sorry, I only have information about my Mb-trac 800.
In my workshop-manual is the distance from the contact ring (you can see on my picture) to the surface of the fly wheel.
Driving clutch 106 mm +-0,5mm
PTO clutch 130 mm +-0,5mm
But sorry, I cannot say whether this fits to Mb-1000. This are the distances from dual clutch DT280/280G and DT295 from LuK.