Cornwell Tools CAT-3790-6 User manual

CAT-3790-6 1 Rev. 05/18/07
CAT-3790-6
1" Dr. Impact
Wrench with 6"
Extended Anvil
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
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.
Max. Free Speed . . . . . . . . . . . . . . . . 4,500 RPM
Maximum Torque . . . . . . . . . . . . . . . . 1,600 ft. lbs.
AirInlet........................ 1/2"NPT
Recommended Hose Size . . . . . . . . . . . . . 3/4" ID
Recommended Air Pressure . . . . . . . . . . . . . 90 PSI
Overall Length . . . . . . . . . . . . . . . . . . . . . . 18.4"
Net Weight . . . . . . . . . . . . . . . . . . . . . . 13.9 lbs.
Avg. Air Consumption . . . . . . . . . . . . . . . 7.9 CFM
SPECIFICATIONS

CAT-3790-6 2 Rev. 05/18/07
FAILURE TO OBSERVE THESE WARNINGS COULD RESULT IN INJURY.
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 Stan-
dards 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 3/4" 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 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 instruc-
tions for correct set-up.
• Air powered tools can vibrate during
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.
• Slipping, tripping and/or falling while
operating air tools can be a major cause of seri-
ous 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
sockets and accessories, as they may
be damaged or cause damage to the
equipment or operator.
• 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 any labels. Replace any
damaged labels.
• Use accessories recommended by
Cornwell Tools.

CAT-3790-6 3 Rev. 05/18/07
PARTS BREAKDOWN - CAT-3790-6
Ref. # Item # DESCRIPTION QTY
101 RS1078101 Bolt Assembly 10
102 RS1078102 Oil Seal 1
103 RS37906103 Hammer Case 1
104 RS37906104 Hex. Soc. Head Screw 1
105 RS1078105 Steel Ring 1
106 RS76803 Hammer Case Bushing 1
107 RS1078107 Socket Retainer 1
108 RS1078108 O-Ring 1
109 RS1078109 Anvil (extended) 1
110 RS1078110 Hammer Frame Pin 2
111 RS1078111 Hammer 2
112 RS1078112 Hammer Frame 1
113 RS76804 Collar 1
114 RS1078114 O-Ring 1
115 RS1078115 Washer 1
116 RS1078116 Fixed Ring 1
117 RS37906117 Handle 1
118 RS1078118 Protector 4
201 RS37906201 Housing (Incl. #202) 1
202 Thread Insert (Incl. w/#201) 8
203 RS1078203 Housing Gasket 1
204 RS37906204 Rear Cover Unit 1
205 RS76721 Spring 1
206 RS1734416 Steel Ball 1
207 RS1078207 O-Ring 3
Ref. # Item # DESCRIPTION QTY
208 RS1078208 Regulator-B 1
209 RS1078209 Hex. Soc. Head Bolt 1
210 RS1078210 O-Ring 1
211 RS1078211 Regulator-A 1
212 RS1078212 Reverse Valve 1
301 RS1078301 O-Ring 1
302 RS76822 Bearing 1
303 RS1078303 Oil Seal 1
304 RS1078304 Magazine 1
305 RS1078305 Cylinder 1
306 RS1078306 Blade 6
307 RS1078307 Rotor 1
308 RS1078308 Rear End Plate 1
309 RS221RA35 Bearing 1
310 RS1078310 Pin 1
401 RS1078401 Trigger 1
402 RS1078402 Spiral Pin 1
403 RS1078403 Spiral Pin 1
404 RS1078404 Bushing 1
405 RS1078405 Pin 1
406 RS1078406 Seal 1
407 RS1735113 Ball 1
408 RS1078408 Spring 1
409 RS1078409 Air Inlet 1
Also available: RS1078TK Tune-up kit, including items #'s: 102, 107, 108, 114, 203, 207 (3), 210, 301, 303, 306 (6), 406

CAT-3790-6 4 Rev. 05/18/07
Operating Instructions • Warning Information • Parts Breakdown
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 used for connecting air supply has standard
1/2" NPT. Line pressure should be increased to compensate
for unusually long air hoses (over 25 feet). Minimum hose
diameter should be 3/4" 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. ounce 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. A rust
inhibitive oil is acceptable for air tools.
WARNING: After an air tool has been lubricated, oil will
discharge through the exhaust port during the first few
seconds of operation. The exhaust port must be covered with a
towel before applying air pressure to prevent serious 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. 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 air regulator is also used to change the rotation of the tool.
When the valve is turned to the right, the tool is in a forward
or right hand rotation. When the valve is turned to the left, 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.
TROUBLESHOOTING
Other factors outside the tool may cause loss of power or erratic
action.Reducedcompressoroutput,excessivedrainontheairline,
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.
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 descrip-
tion 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.
Air inlet
Air reGUlAtOr