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How to operate a manual pallet jack
Find the release lever.
Stand behind the manual pallet jack as this is the position you will be in when you move it. Find the small lever that allows the pallet jack prongs (the large flat metal pieces near the floor) to drop all the way down toward the floor.
The pallet jack drop lever is often a small lever in the middle of the rounded handle, on the vertical stem of the manual machine. It may be distinguished by a different color of plastic, or otherwise marked, or it may not be.