In article ,
"habbi" wrote:

I have what I thought was a decent quality cambell hausfeld 1/2" gun which
is rated at 380 ftlbs. All fitting are 1/4" M style and hose is 25' 3/8" ID.
It will not remove my lug nuts from my chev 1/2 ton truck. I tried pressures
from 90 up to 120 psi with no luck. It removed a few of them but some will
not loosen at all. I am using 1/2" drive impact sockets as well. Anyway are
these guns over rated, it is made in Taiwan. I noticed some ingersoll rand
and even sears brands rated up to 600-700 ftlbs, is this what I need. I
tried a friends Chicago pneumatic and it would not spin the nuts either.
Also there is an Allen set screw type plug in the side of the gun and it
says oil, how do you know how much to put in? Thanks

One thing about impact guns is that a loose/worn socket or a worn nut
will cause a lot of bounce. You'll jiggle the socket around a whole
lot, and get it warm, but never get anywhere. A way to counteract it is
to violate the safety warnings and grab the socket by hand (I wear a
leather glove while doing it) and manually twisting it and holding it in
the direction you want to go. Then hammer on it. That way you'll get
the most force directly into the fastener when the hammer hits.
More air pressure actually won't get you that much more kick out of
an impact. It'll just deplete your air tank more quickly and be louder.
I own some Ingersoll-Rand impacts, but plan to migrate over to
Chicago Pneumatic eventually. But either brand is better than the
walmart brand if you need the extra force.

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B.B. --I am not a goat! thegoat4 at airmail dot net