If you want to accomplish maintenance to your CCM 450 DS then it is usually a good idea to own a Workshop Manual for a reference just in case you want to know ways to take out a specific part much like the Wheel and match it again in the correct way.
CCM 450 DS Workshop Manuals provides distinct diagnostic info for the car or truck so if something is faulty it will help you determine what the issue is and methods to resolve it. Then you are able to evaluate if you can do this on your own or if the job is simply too big you can actually make a booking for your 450 DS right into a trusted mechanic.
CCM 450 DS manual