Thats the Float button that allows your attachment to follow the uneven contour of the ground. Just soak it good with Knocker or PB Blaster and take a lite weight hammer and tap down on the big top button then up on the bottom pin then down again while holding back on the lift handle. When its working right you slightly pull back on the handle while pushing down on the thumb button and the Float lock button pops out releasing the thumb button to rise. Keep soaking and tapping and it'll free up for you.
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Keep dragg'n em in. They're like orphans...they all need a place to call home.
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