If you have to carry out fixes to your Triumph TR 6 Thunderbird then it is always a good idea to own a Workshop Manual for personal reference in the event you need to know the right way to take out a specific component much like the Wheel Bearing and match it again safely.
Triumph TR 6 Thunderbird Workshop Manuals will give you exact diagnostic information for your automobile so if something is faulty it can help you identify what the issue is and ways to fix it. You can then decide if this can be achieved yourself or if the job is too big you could make a booking for your TR 6 Thunderbird in to a trusted repair garage.
Triumph TR 6 Thunderbird manual