If you need to do auto repairs for your CCM 604 R then it will always be recommended to possess a Workshop Manual to keep just for personal reference in the event you need to know the right way to take off a particular component for example, the Gearbox and fit it again effectively.
CCM 604 R Workshop Manuals can provide particular diagnostic guides on your car so if something is wrong it will help you work out what the problem is and the best way to make it better. You can then assess if you can do this by yourself or in case the job is simply too big it is possible to make a reservation for your 604 R into a decent car garage.
CCM 604 R manual