Large hammers have an air driven piston (an air cushion betweem pistons) and an intermediate anvil that actually hammers on bit. If the cylinder and air cushion piston are dry there will not be enough suction/pressure between the driver piston and driven. Remove lower part of hammer and lube with electric hammer grease. Make sure that orings fit snuggly and the anvil is not jammed. Do not store hammer with the bit pointing up because the driven piston will slide down cylinder and hug driver piston. If the hammer was stored pointing up, turn hammer around and place in stand with nose down in a warm location so that the driver piston will drop into place. Good holidays
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