The Impeller of Troy 2410 snow blower was making knocking sound, I replace bearing and Impeller and still  making knocking sound. I took Auger  off and discount belt from pulley, the shaft the impeller on it and connected to bearing   and
 
Polly can move up and down slightly by hand and it is not tight. Is suppose to be like this?
	
		
			
		
		
	
			
			
Polly can move up and down slightly by hand and it is not tight. Is suppose to be like this?