Cornwell Tools CAT250AHMV User manual

CAT250AHMV 1 Rev. 05/27/09
CAT250AHMV
Heavy Duty
Air Hammer
Blows per minute .........................2,200 BPM
Stroke Length ................................3-3/4"
Shank Opening ..............................0.401"
Bore Diameter .................................3/4"
Average Air Consumption ..................... 4 CFM
Length ......................................11.1"
Weight .....................................5.5 Lbs
Air Inlet ...............................1/4"- 18 NPT
Minimum Hose Size .........................3/8" I.D.
SPECIFICATIONS
Some dust created by power sanding, sawing, grinding,
drilling, and other construction activities contains chemicals
known to cause cancer, birth defects or other reproductive
harm. Some examples of these chemicals are:
• leadfromlead-basedpaints,
• crystallinesilicafrombricksandcement
and other masonry products, and
• arsenicandchromiumfrom
 chemically-treatedlumber.
Your risk from these exposures varies, depending on how
often you do this type of work. To reduce your exposure to
these chemicals: work in a well ventilated area, and work with
approved safety equipment, such as those dust masks that are
specially designed to filter out microscopic particles.
ALWAYS READ
INSTRUCTIONS
BEFORE USING
POWER TOOLS
ALWAYS WEAR
SAFETY GOGGLES
WEAR HEARING
PROTECTION
AVOID
PROLONGED
EXPOSURE TO
VIBRATION
Operating Instructions
Warning Information Parts Breakdown
Copyright © Professional Tool Products, 2009
All rights reserved

CAT250AHMV 2 Rev. 05/27/09
WARNING - FOLLOW THESE RULES FOR SAFE OPERATION!
This Instruction Manual Contains
Important Safety Information.
READ THIS INSTRUCTION
MANUAL CAREFULLY AND
UNDERSTAND ALL INFORMATION
BEFORE OPERATING THIS TOOL.
• Always operate, inspect and maintain
this tool in accordance with American
National Standards Institute Safety
Code of Portable Air Tools (ANSI
B186.1) and any other applicable
safety codes and regulations.
• For safety, top performance and
maximum durability of parts, operate this tool at 90
psig 6.2 bar max air pressure with 3/8” diameter air
supply hose.
• Always wear impact-resistant eye
and face protection when operating
or performing maintenance on this tool.
Always wear hearing protection when
using this tool.
• High sound levels can cause
permanent hearing loss. Use hearing
protection as recommended by your
employer or OSHA regulation.
• Keep the tool in efficient
operating condition.
• Operators and maintenance personnel must be physi-
cally able to handle the bulk, weight and power of this
tool.
• Air under pressure can cause severe
injury. Never direct air at yourself or
others. Always turn off the air supply,
drain hose of air pressure and detach
tool from
air supply before installing, removing
or adjusting any accessory on this tool, or
before performing any
maintenance on this tool. Failure to do
so could result in injury. Whip hoses can
cause serious injury. Always check for
damaged, frayed or loose hoses and fit-
tings, and replace immediately. Do not
use quick detach couplings at tool. See
instructions for correct set-up.
• Air powered tools can vibrate in use.
Vibration, repetitive motions or
uncomfortable positions over extended
periods of time may be harmful to
your hands and arms. Discontinue use
of tool if discomfort, tingling feeling or
pain occurs. Seek medical advice before
resuming use.
• Place the tool on the work before starting the tool.
Do not point or indulge in any horseplay with this tool.
• Slipping, tripping and/or falling while
operating air tools can be a major cause
of serious injury or death. Be aware of
excess hose left on the walking or work
surface.
• Keep body working stance balanced
and firm. Do not overreach when
operating the tool.
• Anticipate and be alert for sudden changes in motion
during start up and operation of any power tool.
• Do not carry tool by the hose. Protect
the hose from sharp objects and heat.
• Tool shaft may continue to actuate
briefly after throttle is released. Avoid
direct contact with accessories during
and after use. Gloves will reduce the risk
of cuts or burns.
• Keep away from moving end of tool.
Do not wear jewelry or loose clothing.
Secure long hair. Scalping can occur if
hair is not kept away from tool and
accessories. Choking can occur if
neckwear is not kept away from tool
and accessories.
• Never use a chisel as a handstruck tool. They are
designed and heat treated to be used only in air
hammers. Select the correct shank and retainer for the
tool.
• Never use dull accessories. Never cool a hot accessory in
water as brittleness and early failure can result. Accessory
breakage or tool damage may result from prying.
Take smaller bites to avoid getting stuck.
• Do not lubricate tools with flammable or volatile
liquids such as kerosene, diesel or jet fuel.
• Don’t force tool beyond its rated capacity.
• Do not remove any labels. Replace any damaged
labels.
• Use accessories recommended by Cornwell Tools.

CAT250AHMV 3 Rev. 05/27/09
Nipple
AIR SUPPLY
Tools of this class operate on a wide range of air pres-
sures. It is recommended that air pres sure of these tools
measures 90 PSI at the tool while running free. Higher
pres sure (over 90 psig; 6.2 bar) raises performance
beyond the rated capacity of the tool which will
shorten the tool’s life be cause 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 rec om mend ed hook-
up pro ce dure can be viewed in the above figure.
The air inlet used for con nect ing air supply, has
stan dard 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 di men sions 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 sup-
ply, then run the tool. Overfilling will cause a
re duc tion in the power of the tool.
OPERATION
Always place a chisel in the hammer and hold the tool
down to the work before operating. Damage to the
tool or the retainer may result if this precaution is not
followed.
The chisel retainers are not designed for complete
safety against accidental release of cutters or ham-
mers. To avoid injury, the throttle must never be
depressed unless the chisel is held firmly against the
work place. When tool is not in actual use, the chisel
must be removed. During operation, safety goggles
should always be used to guard against flying rust and
chips. When using tool, regulate the speed so that the
chisel is not being driven out of the cylinder. If piston is
allowed to strike the cylinder wall, internal damage
will result.
To change chisel, pull back on spring hook and insert
chisel. Release spring hook.
To regulate air, turn air regulator knob out for maxi-
mum air pressure and in for minimum.
WARRANTY
Cornwell warrants its air tools for a period of 1 year to the consumer. We will repair any CAT250AHMV covered under this war-
ranty 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.

CAT250AHMV 4 Rev. 05/27/09
PARTS bREAKDOWN - cAT250AHMV
Ref. # Item # DESCRIPTION QTY
1 RS248001CWL Housing 1
2 RS848002 Pin 2
3 RS848003 Inlet Bushing 1
4 RS848004 Cap 1
5 RS848005 O-Ring 2
6 RS848006 Regulator 1
7 RS848007 O-Ring 1
8 RS848008V Valve Stem 1
9 RS848009 O-Ring 1
10 RS848010 O-Ring 1
11 RS848011 Valve Bushing 1
Ref. # Item # DESCRIPTION QTY
12 RS848012 O-Ring 1
13 RS848013 Spring 1
14 RS848014 Trigger Button 1
15 RS181112 Metal Valve Block Assy 1
20 RS848019 Piston 1
21 RS848320 Cylinder 1
22 RS248022CWL Comfort Grip 1
23 CCR130 Quick Change Chuck 1
24 RS848023 Exhaust Deflector 1
26 RS87301 Retainer Spring (optional) 1