Cornwell Tools CAT351HD User manual

CAT351HD 1 Rev. 07/24/07
Operating Instructions • Warning Information • Parts Breakdown
CAT351HD
3/8" High Powered
Heavy Duty
Impact Wrench
ALWAYS READ
INSTRUCTIONS
BEFORE USING
POWER TOOLS
ALWAYS WEAR
SAFETY GOGGLES
WEAR HEARING
PROTECTION
AVOID
PROLONGED
EXPOSURE TO
VIBRATION
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.
Working Torque: . . . . . . . . . . . . . .90-280 ft.lbs.
Maximum Torque:. . . . . . . . . . . . . . . 300 ft.lbs.
Free Speed: . . . . . . . . . . . . . . . . . . . 12,500 rpm
Rec. Air Pressure:. . . . . . . . . . . . . . . . . . . .90 psi
AirInlet:........................ 1/4"npt
RecHoseSize:.......................3/8"
OverallLength.......................5.7"
Weight...........................3.3lbs.
SoundLevel...................... 97dBA
SPECIFICATIONS

CAT351HD 2 Rev. 07/24/07
THIS INSTRUCTION MANUAL CONTAINS
IMPORTANT SAFETY INFORMATION.
READTHIS INSTRUCTION MANUAL
CAREFULLYAND UNDERSTANDALL
INFORMATION BEFOREOPERATINGTHISTOOL.
• Always operate, inspect and maintain
this tool in accordance withAmerican
National Standards Institute Safety Code of
PortableAirTools (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
protectionwhen operatingorperforming main-
tenance 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
physically 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 adjustingany
accessoryonthistool,orbeforeperforming any
maintenance on this tool.Failure to do so could
result ininjury.Whip hoses can cause serious
injury. Always check for damaged, frayed or
loose hoses and fittings, and replace immedi-
ately. 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.Seekmedical
advicebeforeresuming use.
• Place the tool on the work before starting
the tool.
• Slipping, tripping and/or falling while
operating air tools can be a major cause of seri-
ous injury or death.Be aware of excess hoseleft
onthewalkingorworksurface.
• Keep body working stance balanced
and firm.Do notoverreachwhenoperating 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 rotate briefly
after throttle is released. Avoid direct
contact with accessories during and
after use. Gloves will reduce the risk of
cutsorburns.
• Keep away from rotating 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.
• Impact wrenches are not torque control
devices. Fasteners with specific torque
requirements must be checked with suitable
torque measuring devices after installation
with an impact wrench.
• Use only impact wrench sockets and
accessories on this tool.Do not use hand
sockets and accessories.
• Donot lubricatetools with flammable or
volatileliquids such as kerosene, diesel or
jet fuel.
• Do not force tool beyond its rated capacity.
• Do not remove any labels. Replace any
damaged labels.
FAILURE TO OBSERVE THESE WARNINGS COULD RESULT IN INJURY.

CAT351HD 3 Rev. 07/24/07
Ref. # Item # DESCRIPTION QTY
1 RS351HD01 Inlet Bushing 1
2 RS351HD02 Exhaust Deflector 1
3 RS351HD03 Throttle Valve Spring 1
4 RS351HD04 Valve Stem 1
5 RS351HD05 Throttle Valve Seat 1
6 RS351HD06 Spacer 1
7 RS351HD07A Regulator & Reverse Valve (incl. #8, #9) 1
8 RS351HD08 Spring 1
9 RS351HD09 Ball 1
10 RS351HD10 Housing Cap 1
11 RS351HD11 Retainer 1
12 RS351HD12 O-Ring 1
13 RS351HD13 Gasket 1
14 RS351HD14 Motor Housing 1
15 RS351HD15 Trigger 1
16 RS351HD16 Plug Screw 1
17 RS351HD17 Ball Bearing 1
18 RS351HD18 Rear Plate 1
Ref. # Item# DESCRIPTION QTY
19 RS351HD19 Rotor 1
20 RS351HD20 Rotor Blade 6
21 RS351HD21 Cylinder 1
22 RS351HD22 Guide Pin 1
23 RS351HD23 Front Plate 1
24 RS227B25 Ball Bearing 1
25 RS351HD25 Hammer 2
26 RS351HD26 Hammer Cage 1
27 RS351HD27 Hammer Pin 2
28 RS351HD28 Anvil 1
29 RS351HD29 Retainer O-Ring 2
30 RS351HD30 Socket Retainer 1
31 RS351HD31 Anvil Bushing 1
32 RS351HD32 O-Ring 1
33 RS351HD33 Hammer Housing 1
34 Spring Washer 1
35 RS351HD35 Screw (including #34) 8
36 RS351HD36 Grip (not shown) 1
16
19
18
15
6
5
31
27
35
28
30
29
20
34
33
32
24
27
17
26
25
14
12
11
23
25
21
4
35
3
13
2
10
34
7
98
1
22
R
CORNWELL
TOOLS
PARTS BREAKDOWN - CAT-351HD

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.