The time I owned the ZTS tractors, they had 2 cylinders that pressed in the clutch plate and were in the bell housing one either side of the shaft coming out of the gearbox, and if 1 went press in the clutch pedal and nothing would happen.
But they had to be centred when fitting new ones, it`s like your problem the shaft going into the cylinder is off centre and is scoring the wall or pressing it crooked.