What size of compressor do you have? Do you know the CFM rating on it? What impact wrenches use is compressed air volume, and lots of it. If you have a small tank or compressor, you will not have the volume of compressed air to loosen anything. They should be fine with a 7hp 80 gallon tank, but that is about as small as you should think to run an impact on. You may get some limited use with a 60 gallon tank, but if you get any smaller, you will only loosen the bolts that weren"t that tight to start with. That may be the issue with your current impact. I can loosen some very tight nuts with my IR, but even the cheapies will get most nuts with sufficent volume of compressed air. If you can not get any appreciable use from a brand new, allbeit cheapie, impact, I"ld start looking at your air compressor capacity.
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