If my memory serves me correctly, your tractor was built in 1995 (5) November 4th (K04) Day shift (B).
The independent PTO is part of the hydraulic system verses a two-stage clutch like your MF 135 and is actuated by engaging the lever. To the best of my knowledge, it torques up (as you put it) as soon as it is engaged. I would engage it at low RPM’s and increase the RPM as needed. HTH. Rick H. Ga.