Two key points: what type/size of impact wrench is it and what is your inlet pressure. Most cheap and even good quality impact wrenches are designed to run at pressures above 75psi (some even at 90+ psi particularly for larger 1/2" models). If your inlet pressure is low you will get no power and excessively low pressure will cause the problem you mentioned, no rotation just the air flow. If low inlet pressure is ok then it very well could be the tool. Do you lubricate it frequently or at all with a air tool lubricant.
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18 years ago