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Originally Posted by ProwlerGT
Does anyone know what the turning knob at the bottom of the impact gun does? It has a 1-2-3-4 on it. I've used impact guns before, but don't remember what that does.
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That raises the pressue in the gun, resulting in more torque.
You very well could have had your gun turned all the way down, which is why it wouldn't take the lugs off. All you need is around 100-125ft/lbs, and I can't think of many impacts that couldn't supply at least that amount of torque (psi != torque).