Welcome to the forum. As already mentioned, we have an extensive Technical library at this site and if you click on the liink
you will be transported to the clutch section. Over the years, Case used several types of clutches but more than likely, you have the latest style called the EZ Adjust clutch. You will find several manuals in the clutch section that will help you determine which clutch you have and how to perform a clutch adjustment.
If you clutch disc is worn out, it can be replaced as a separate item. Unfortunately, we cannot be there to show you how to do this work. All we can do is to provide the Service Manual for the clutch, tell you where to buy parts if you need them and to help you understand better what you may not understand after reading the clutch manual carefully a few times.
Hang in there. You have a great tractor with a minor problem. There is a learning curve to the clutch adjustment but it can be mastered.