I am not familiar with the DF but the critical adjustment is to have enough free travel (generally 1") in the pedal before the throw out hits the fingers on the clutch. this adjustment is usually outside between the pedal and the clutch lever. as the clutch wears, the pressure plate moves forward against the disk and the fingers move closer to the throw out bearing. A common characteristic to all the chinese clutchs (and to clutches in general) is they don't like to be slipped.... not at all. there is very likely an access to the clutch itself, but if equipped with a front loader, is often covered by one of the brackets, which would have to be removed first. then you can get in and possibly adjust if you cannot get 1" of free travel in the pedal using the outside adjustment.