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How To: Operate A Liebherr 621C Loader (Basic Control Functions) - In this video, our operator demonstrates and discusses how to use the controls of a Liebherr 621C Crawler Loader. This video covers the basics needed to run the machine. The Liebherr 621C is an excellent front end loader which is reliable and easy on the operator when used all day long on construction sites or projects. We have been and continue to be happy with the performance of this loader. W.C. Black and Sons, Inc. is a state licensed Demolition, Excavating, Grading, Land Clearing, and Hauling Contractor based in Charlotte, North Carolina. Our company is family owned and operated and has served the Carolinas for more than 35 years. To learn more about our company, visit us on the web at: http://www.wcblackandsons.com.