I have a Sno-Tek 902402 and this is my second season using it. Today when clearing my driveway, I noticed that my snow blower was having a hard time throwing the snow, and was making a whining noise. I checked the front gear case and it was full. When I manually move the impeller, it moves the augers. The break pins are all still in place. When the snowblower is started, and the augers are engaged, the impeller spins. But when I push into about 3" of semi wet snow, it starts bogging down and making a whining noise. I am a newb, so any suggestions are appreciated.