Welcome to SatGuys!
For faster, more accurate help with your 4DTV IRD, you may want to have this thread move into the C-band areas.
Which version of the 4DTV are you using and what, dish size, what feedhorn and LNB setup?
Have you replaced the servo lately?
Was the above setup tracking the arc and working correctly before you added the 4DTV, or is this a new setup?