How do i get more torque out of my craftsman impact gun?

If you are just oiling the gun,hold it upside down and squirt some oil ine the air chuck fitting.(I just use an empty bottle of my wife's hair dye filled with ATF-it's cheaper than a can of "air tool oil".If you are referring to the grease fitting for the impact mechanism,look for a small hole with a captured metal ball.The only tool I found to fill this is a specially designed miniature grease gun(got mine at Sears).

Just put 3-5 drops of air tool oil down the air inlet coupler and then run the gun for 5 seconds. Do this everyday that you run the gun for best results.

This gun shouldnt have an adjustment. If you cfm's from your compressor are enough. Too low cfm's mean lower torque. If cfm is high enough for the gun rating then I would say the gun is bad.

Yes a second washer would be acceptable as long as the splines on the shaft are at or slightly above the top of the pulley but it shouldn't be needed as long as the nut is torqued tight enough. Make sure the pulley is in good shape and the nut gets torqued down properly or the splines will tear up. There should have been a set of instructions with the new mandrel that gave the torque spec. Normally I just use a 1/2 inch drive craftsman air impact gun set to full power with about 100# air pressure. It is a rather large lock nut so it takes a lot of torque. Hope this helps. Please vote yes, thank you.

Make sure the expansion ring is on the end of the impact gun. this holds the sockets in place.

I just bought one of these also. Manual says oil goes into "the air inlet" which I'm thinking is where you attach the hose. That way the oil is sprayed throughout the interior of the gun once you run air through it.
Question for you: I can't get an impact socket onto this gun, almost seems like the square hole is too small. (yes, both are 1/2" drive). How do you get a socket on this stupid thing?
(man that sounds like I'm an idiot, but I've spent a half hour leaning all my body wight, wiggling, etc. and can't get a damn socket on)

The seal is bad inside leaking air pressure to the gun without squeezing the triger. Get a reseal kit from Sears

Make sure the fitting are tight on the hose and gun. Also make sure that the switch for forward/reverse is solidly in one position, if it is not it will cause what you described.

Use a good grease. Don't pack it, just lube the parts. If it is all together, put in about half an ounce of air tool oil through the plug.

An air-powered impact wrench runs off of an air compressor with a tank – the air compressor should have at least a 10 gallon tank and be able to generate at least 3hp. Also, an impact wrench requires special sockets that are designed to withstand the high torque applied by the wrench.