On mine, there's a little round button about 2 inches in diameter on the right side of the belt, about 3/4 of the way toward the back. If you press on that, and put your weight at the end of the bed, it will lower. To bring it back up, you just stay off the bed and push the button again. It's hydraulic. I actually had to take the back off and adjust mine to work.
Hope this helps.
barc411
Hope this helps.
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