My motor with 300 hours makes what I would call a momentary growling sound when lowered to the almost vertical position.  I don't see or feel any corrosion or problems on the operating shafts and there's no hesitation.  The fluid is full and clean.  What could this be?
			
			 
                 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 