"mark" wrote in message
...
I bought what is apparently the most powerful 1/2" drive impact wrench
available IR 2135 with 1000 ftlb or torque and am still finding it
weak. The other day it would not remove the bolts that hold on my
front brake caliper bracket and sometimes it wll not remove lugnuts. I
am using it at 125psi with 50' of 3/8" hose and 1/4" M (milton) quick
connects). Would going to 3/8" qc fittings help at all? I notived a
local tire shop has the air pressure at 150 psi. Is this what is
needed? How come air tools say never to go above 90 psi?

Mark

In theory the bigger QC will help, I am using a IR2132 (700 ft-lb rated)
with 1/4 QC. Other things to check.
1) Is the tool oiled. Air tool oil not only makes them last longer it makes
them work better. I put in a couple of drops every time I connect up the
any of my air tools to the hose.
2) Are you using any extensions? In my experience every extension, swivel,
or adapter I put on the Impact wrench seems to reduce the force applied at
the bolt or nut.
3) Are all controls on the gun set to max? (sorry had to ask) On my IR2132
the power control only seems to affect the tightening function not the
loosening function, your may be different.
4) is you air compressor tank at the bottom of the pressure range? On tough
bolts, I run the impact wrench until the air compressor kicks on, then wait
until it stops and I have max pressure in the tank. The difference in
performance between 90 and 125 PSI is significant.

The only time my IR2132 has not been able move things was a harmonic
balancer bolt, where I needed an extension and a 1/2 to 3/4 adapter to
reach. It struggled on one very rusty set of lug nuts on a truck I bought
that the previous owner appears to run on the beach every weekend. I had to
use the cycle the compressor trick in that case.

Carl Boyd