Mechanical dock levelers use springs to move up and down. Part of the spring system works to extend and pull back the dock leveler as it is moving up and down. Since springs are temperature-sensitive, they need continual adjustment to work properly in hot and cold weather. This causes the springs to wear down more quickly. In addition, springs are the most constantly-used parts on mechanical dock levelers, so they wear out faster than any other parts and require more frequent replacement. This spring is a main extension spring for a Rite Hite mechanical dock lifter. When this spring fails, the dock leveler will not extend, and the dock leveler cannot be manually extended.
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Everything worked out just right I will be ordering more parts