CAT351HD
4
Rev. 07/24/07
AIR SUPPLY
Tools of this class operate on a wide range of air pres-
sures. 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 1/2 oz. 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 air regulator knob can be used as an air throttle, if
there are no other means of regulating air. Turn the air
regulator knob all the way to position 4 for maximum
power.
The air regulator can be used to adjust torque to the
approximate tightness of a known fastener.To set the tool
to desired torque, select a nut or screw of known tight-
ness of the same size, thread pitch and thread condition as
those on the job. Turn air regulator to low position,
apply wrench to nut and gradually increase power (turn
regulator to admit more air) until nut moves slightly in
the direction it was originally set. The tool is now set to
duplicate that tightness - note regulator 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 regulator 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 reversing 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 hardness, 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
Nipple
WARRANTY
Cornwell warrants its air tools for a period of 1 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
.
