If you have to accomplish maintenance to your CCM CR 40 then it will always be recommended to have a Workshop Manual to use as reference in case that you need to know proven methods to strip off a specific part such as the Drive Shaft and match it again successfully.
CCM CR 40 Workshop Manuals provides precise diagnostic guides for your automobile therefore if something is wrong it can help you figure out what the issue is and the way to resolve it. You can then decide if you can do this by yourself or if the job is just too big you can still book your CR 40 in with a trusted mechanic.
CCM CR 40 manual