Juicer heating and pulp is wrapping around blades

I juice all kinds of leafy greens like kale, lettuce, spinach, sprouts; broccoli, cauliflower, cabbage, and the harder vegetables such as carrots, beets, celery, etc. I like the posting by Lisa in Jan. am finding that I have to put too much pressure to get the pulp moving.  So now I decided to clean the blade half way through my process which is a drag.  I have also tried to do the harder vegetables in between the leafy ones.  I always do the celery last as its strings wrap around the blade. Do I need a new blade?  Juicer is about 8 years old but has not been used a lot till this last May.  It is now in daily use making at least 24-30 ounces of juice. Also, the white cover that holds the screen in place has a minor fracture nearest the machine.  I would rather have it replaced before I am unable to use it.  The juicer is a daily necessity in our health regime.  I am in BC.  Where do I get a replacement? Thanks so much for your prompt reply. Eddie