Hi, I'm new to this forum (PA based) so please forgive what I'm sure will be a newbie question. I have a Toro 521 38052 1990. My Auger turns when engaged but stops with minimal resistance. With the Blower off I can manually rotate the auger backwards but not forwards. When I go backwards the Auger makes a clicking sound. Can I assume this is the worm gear or is there something else I should check?