CAT2115M 4 Rev. 07/19/07
AIR SUPPLY
Tools of this class operate on a wide range of air pressures. It is
recommended that air pressure of these tools measures 90 PSI at
the tool while running free. Higher pressure (over 90 psig; 6.2 bar)
raises performance beyond the rated capacity of the tool which
will shorten tool life because of faster wear and could cause injury.
Always use clean, dry air. Dust, corrosive fumes and/or water in
the air line will cause damage to the tool. Drain the air tank daily.
Clean the air inlet filter screen on at least a weekly schedule. The
recommended hookup procedure can be viewed in the above figure.
The air inlet used for connecting air supply, has standard 1/4"
NPT. Line pressure should be increased to compensate for
unusually long air hoses (over 25 feet). Minimum hose diameter
should be 3/8" I.D. and fittings should have the same inside
dimensions and be tightly secured.
LUBRICATION
Lubricate the air motor daily with quality air tool oil. If
no air line oiler is used, run a 1/2 ounce of oil through the tool.
The oil can be squirted into the tool air inlet or into the hose at the
nearest connection to the air supply, then run the tool. Overfilling
will cause a reduction in the power of the tool.
OPERATION
The forward and reverse valve can be used as an air throttle, if
there are no other means of regulating air. Turn the valve knob all
the way to position 4 for maximum power.
The valve can be used to adjust torque to the approximate tight-
ness of a known fastener.To set the tool to desired torque, select
a nut or screw of known tightness of the same size, thread pitch
and thread condition as those on the job. Turn valve to low posi-
tion, apply wrench to nut and gradually increase power (turn
valve to admit more air) until nut moves slightly in the direction
it was originally set. The tool is now set to duplicate that tight-
ness - note valve setting for future use. When tightening nuts not
requiring critical torque values, run nut up flush and then tighten
an additional one-quarter to one-half turn (slight additional turning
is necessary if gaskets are being clamped). For additional power
needed on disassembly work, turn valve to its fully open position.
This impact wrench is rated at 3/8" USS bolt size. Rating must be
down graded for spring U bolts, tie bolts, long cap screws, double
depth nuts, badly rusted conditions and spring fasteners as they
absorb much of the impact power. When possible, clamp or wedge
the bolt to prevent springback.
Soak rusted nuts in penetrating oil and break rust seal before
removing with impact wrench. If nut does not start to move in
three to five seconds, use a larger size impact wrench. Do not
use impact wrench beyond rated capacity as this will drastically
reduce tool life.
The forward and reverse valve is used to change the rotation of
the tool. When the valve is out, the tool is in a forward or right
hand rotation. When the valve is pushed in, the rotation is reverse
or left hand.
NOTE: Actual torque on a fastener is directly related to joint hard-
ness, tool speed, condition of socket and the time the tool is
allowed to impact. Use the simplest possible tool-to-socket hook
up. Every connection absorbs energy and reduces power.
Operating Instructions • Warning Information • Parts Breakdown
WARRANTY
Cornwell warrants its air tools for a period of 2 year to the consumer. We will repair any air tool covered under this
warranty which proves to be defective in material or workmanship during the warranty period. In order to have your
tool repaired, return the tool to any Cornwell Authorized Warranty Center, freight prepaid. Please include a copy of
your proof of purchase and a brief description of the problem. The tool will be inspected and if any part or parts are
found to be defective in material or workmanship, they will be repaired free of charge and the repaired tool will be
returned to you freight prepaid.
This warranty gives you specific rights. You may also have other rights which vary from state to state.
The foregoing obligation is Cornwell’s sole liability under this or any implied warranty and under no circumstances
shall Cornwell be liable for any incidental or consequential damages.
Note: Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above
limitation or exclusion may not apply to you.
