I HAVE a 5400 vermeer round baler 4#5 bale and I pull it with a c-70 McCORMICK tractor and it pulls the hound out of me what do I need to look for ,I know the first would be a bearing ,can't find none that needs replacing most of the time a bad bearing will find you, gear box is full and so on , it doesn't matter wheather it's a third full ,half or almost full, it pulls the same hard. any suggestions?