A VSL making a grinding noise is usually caused by the motor height being out of alignment. This video explains what's going on and how to reset the motor height: https://www.youtube.com/watch?v=uByWxGIyAAc&t=2s
If the loader is still not performing properly contact Valken customer support. Please open a ticket with our customer service department. To open a ticket, please click on the chat button on the bottom of this website and our customer service representative will be happy to assist you.