Cornwell Tools CAT-375 User manual

CAT-375 1 Rev. 05/18/04
CAT-375
3/4" HD
Impact Wrench
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.
CAT-375
Bolt Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1/8"
Max. Free Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . 4,500 RPM
Working Torque . . . . . . . . . . . . . . . . . . . . . . . . 300-1,000 ft. lbs.
Maximum Torque . . . . . . . . . . . . . . . . . . . . . . . . . . 1,500 ft. lbs.
Air Inlet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/4" NPT
Recommended Hose Size . . . . . . . . . . . . . . . . . . . . . . . . . 3/8"
Recommended Air Pressure . . . . . . . . . . . . . . . . . . . . . . . . 90 PSI
Overall Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.25"
Net Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.88 lbs.
Avg. Air Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . 89 dBA
Sound Level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/4"
SPECIFICATIONS
• Operating Instructions • Warning Information
• Parts Breakdown
ALWAYS READ
INSTRUCTIONS
BEFORE USING
POWER TOOLS
ALWAYS WEAR
SAFETY GOGGLES
WEAR HEARING
PROTECTION
AVOID
PROLONGED
EXPOSURE TO
VIBRATION

CAT-375 2 Rev. 05/18/04
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
physically able to handle the bulk, weight and
power of this tool.
• 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.
• 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 fittings, and replace immediately.
Do not use quick detach couplings at tool. See
instructions for correct set-up.
• 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 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 rotate 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 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
• Do not lubricate tools with flammable or volatile
liquids such as kerosene, diesel or jet fuel.
• Do not force tool beyond its rated capacity.
• Do not remove labels. Replace damaged labels.
FAILURE TO OBSERVE THESE WARNINGS COULD RESULT IN INJURY
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 tightness 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 3/4" 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.
CAT-375 3/4" HD Impact Wrench

CAT-375 3 Rev. 05/18/04
CAT-375 3/4" HD Impact Wrench
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 and unclean air
will shorten tool life because of faster wear and may create a
hazardous condition.
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 hook-up procedure can be viewed
in Figure 1.
The air inlet (Figure 2), used for connecting air supply, has standard
1/4" NPT American Thread.
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.
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
Tools authorized service center.
LUBRICATION & MAINTENANCE
Lubricate the tool daily with a good grade of 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 Figure 2, or into the hose at
the nearest connection to the air supply, then run the tool. A rust
inhibitive oil is acceptable for air tools.
Nipple
FIG. 1 FIG. 2
AIR INLET
AIR
REGULATOR
FEATURES
• Twin Hammer Impact Mechanism for outstanding power and
durability
• Side handle for ease of use
• Comfort grip handle for secure grip, and ease of handling
• Rear handle forward/reverse lever for ease of use
1,500 Ft. Lbs. of Maximum torque for big job applications
• Bottom handle exhaust to keep exhaust away from the work
• Only 11.88 Lbs. and 9.25” long for great balance and comfort
Cornwell Tools™ 1 Year Limited Warranty for Air Tools
Cornwell Tools 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 Tools 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 Tools' sole liability under this
or any implied warranty and under no circumstances shall Cornwell
Tools 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.

CAT-375 4 Rev. 05/18/04
CAT-375 3/4" HD Impact Wrench
REF. NO. PART NO. DESCRIPTION QTY.
1 RS37501 Housing/Valve Sleeve 1
2 RS37502 Air Inlet 1
3 RS37503 Exhaust Deflector 1
4 RS37504 Screw 1
6 RS37505 Rubber Grip 1
8 RS37506 Hammer Cage 1
9 RS37509 O-Ring 1
10 RS37510 Anvil 1
11 RS37511 Hammer Pin 2
12 RS37512 Hammer 2
13 RS37513 O-Ring 1
14 RS37514 Valve Stem 1
15 RS37515 Valve Bushing 1
16 RS37516 Spring Pin 1
17 RS37517 Spring 1
18 RS37518 Trigger 1
19 RS37519 O-Ring 1
20 RS37520 O-Ring 1
21 RS37521 O-Ring 1
22 RS37522 Anvil Collar 1
23 RS37523 Set Screw 1
24 RS37524 Ball Bearing 1
25 RS37525 Pin 1
REF. NO. PART NO. DESCRIPTION QTY.
26 RS21109 Ball Bearing 1
27 RS37527 Pin 1
28 RS37528 Bushing 1
29 RS37529 Gasket 1
30 RS37530 Front End Plate 1
31 RS37531 Rear Cover 1
32 RS37532 Rotor 1
33 RS37533 Rotor Blade 1
34 RS37534 Cylinder 1
35 RS37535 Rear End Plate 1
36 RS37536 Regulator Knob 1
37 RS37537 Screw & Spring Washer 4
38 RS37538 Inverted Retaining Ring 1
39 RS37539 O-Ring 1
40 RS37540 Housing Cover 1
42 RS37542 Screw & Spring Washer 4
43 RS37543 Steel Ball 1
44 RS37544 Spring 1
45 RS37545 Gasket 1
46 RS37546 Plate 1
47 RS37547 Washer 1
48 RS37548 Nut 1
49 RS37549 Handle 1