On every tractor or vehicle I have owned the clutch free play was measured with the engine off and sometimes you have to depress the clutch by hand to feel the resistance change. Most clutches require around 3/4 to one inch of free play.
This measured at the foot pedal from the clutch being fully released to point of resistance.
I would suggest double checking to see what the free play is supposed to be on tractor.
At 140 hrs you should probably check this but if it was set correctly from the factory it should not require adjustment. My branson has 300+ hours and has not required any adjustment to date.