CAT-250HD
3
Rev. 10/13/05
Nipple
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 (Figure 2) 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 & MAINTENANCE
Lubricate the air motor daily with quality air tool oil. If no
air line oiler is used, run a teaspoon 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.
The amount of oil to be used is 1 ounce. Overfilling will
cause a reduction in the power of the tool.
TROUBLESHOOTING
Other factors outside the tool may cause loss of power or
erratic action. Reduced compressor output, excessive drain
on the air line, moisture or restrictions in air pipes or the
use of hose connections of improper size or poor conditions
may reduce air supply. If outside conditions are in order,
and the tool still performs erratically, disconnect tool from
hose and take tool to your nearest Cornwell authorized
service center.
OPERATION
Locate center of new hole by using a center punch. Place
drill bit tip in punch mark. Hold drill square with work
and start motor. Apply steady, even pressure. Do not force.
Too much pressure can cause bit to break or overheat. Too
little pressure will keep bit from cutting and cause it to
overheat. Reduce pressure just before bit cuts through the
work. When bit has penetrated work and is spinning freely,
take it from the work while the motor is running, then turn
off drill. If the drill jams in the work, release throttle
immediately. Disconnect the drill before removing bit and
determining cause of trouble. Do not attempt to free the bit
by starting and stopping the motor.
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
.
Figure 2
Figure 1
Air Inlet
CAT-250HD_Manual_101305.indd 3
10/13/05 5:21:20 PM
