your hand pump grease gun only puts out about 6 to 700 PSI but the long handel grease guns can reach up to 10,000 PSI of preassure if it will not go using that much force I would suggest either appling a small amount of heat not hardly enough to scorch the paint or set it out in direct sunlight on a sunny day with a mirror reflecting sunlight at it then while it is still warm/hot attempt to grease it again if that fails only then would I attempt to remove the zert the ones on my 42" deck are basicly bolts with the center drilled out and a zert fitting installed in the head
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