If you want to conduct repairs to your CCM CR 40 then it is always a good plan to have access to a Workshop Manual to keep just for personal reference in the event you want to know tips on how to take off a specific part like the Clutch and install it again adequately.
CCM CR 40 Workshop Manuals will give you identifiable diagnostic information on your car so if something is wrong it helps you find out what the problem is and how you can resolve it. After that you can analyse if you can do this on your own or if the job is just too big you can make a booking for your CR 40 right into a nearby mechanic.
CCM CR 40 manual