track tensioning

I gather that most tracked loaders have the same kind of track tension system, drive slowly to a stop without using brakes, remove the hatch apply grease adjust the tension nut. However I don't seem to be getting the slack out of the track of my 973 cat no matter how much grease is going in and it is going in the nipple.
Am I supposed to turn the relief nut before applying the grease or does it mean the track adjustment has gone as far as it can?

regards Sillaw