Tractor Repair: hy, clutch release bearings, double clutch

Question
i am sorry but i am romanian,and i undarstand what i am reading but i am not writing well.
i have an david brown 850 implematic:
1.between which years was made this model?
2.has  double clutch?(or two clutch,one for power plug,and other for gear )
because it's give power at power plug just when i release total total the clutch pedal

Answer
Hello,

  Actually, your writing is not so bad.  It's better than some that I have gotten from people in the United States.

  Sorry, I don't have any information on what year this model was made.

  To repair your clutch problem, the tractor will have to be split and the clutch and pressure plate will have to be repaired or replaced.  The clutch release bearings will also need to be replaced.  The release bearing for the transmission drive clutch slides over the bearing for the power take off, which I think is what you mean by "power plug".  If something goes wrong with the bearings or pressure plate, releasing the main drive clutch will affect the operation of the power take off clutch.