If you need to perform maintenance to your CCM CR 40 then it is always recommended to possess a Workshop Manual to keep just for reference if you want to know how you can strip off a certain component for example the Clutch and install it again accordingly.
CCM CR 40 Workshop Manuals offers you distinct diagnostic details with regards to your vehicle so if something is broken it can help you identify what the situation is and the best way to repair it. You can then analyse if this can be done by yourself or if the job is too big you could book your CR 40 right into a nearby repair garage.
CCM CR 40 manual