Briggs & Stratton 6381-00 User manual

1/2 in. HEAVY DUTY IMPACT WRENCH
Operator’s Manual
BRIGGS & STRATTON IS A TRADEMARK OF BRIGGS & STRATTON CORPORATION AND IS USED UNDER LICENSE TO ALTON INDUSTRY LTD. GROUP
Product Model # 6381-00
Manual # 80018889
BRIGGS & STRATTON CORPORATION
MILWAUKEE, WISCONSIN, U.S.A.
Read and understand this
instruction manual thoroughly
before using the product. It
contains important information
for your safety as well as
operating and maintenance
advice.
Not for Reproduction

2 BRIGGSandSTRATTON.COM
Thank you for purchasing this quality-built Briggs & Stratton™ air tool. We are pleased that you’ve placed your confidence
in the Briggs & Stratton brand. When operated and maintained according to the instructions in this manual, your Briggs &
Stratton air tool will provide reliable service.
Where to Find Us
You can contact Briggs & Stratton Customer Service by phone at [phone], or on the Internet at
BRIGGSandSTRATTON.COM.
Date Purchased
BRIGGS & STRATTON IS A TRADEMARK OF BRIGGS & STRATTON
CORPORATION AND IS USED UNDER LICENSE TO ALTON
INDUSTRY LTD. GROUP
MILWAUKEE, WI 53201
800 743 4115
BRIGGS&STRATTON
Made in China
Copyright ©2016. All rights reserved.
WARNING Some dust created by using power tools contains chemicals known to the state of California to
cause cancer and birth defects or other reproductive harm. This product contains one or more chemicals known to
the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.
Not for Reproduction

3
General Safety Information 3. Always use protective eyewear which provides
protection from flying particles from the front and
side when using the tool. Ear protectors should also
be worn.
4. Never use oxygen, carbon dioxide, combustible gases
or any other type of bottled gases as a power source
for this tool.
5. Do not connect the air supply hose to the tool with
your finger on the trigger.
6. Do not exceed the maximum working pressure 90
PSI/6.3 bar for the tool. Never connect to an air
source that is capable of exceeding 200 PSI/13.7 bar.
Excessive pressure will reduce the tool life and/or
might cause a hazardous situation.
7. Never leave the operating tool unattended. Discon-
nect the air hose when the tool is not in use.
8. Keep the air supply hose away from heat, oil and
sharp edges.
9. Check the air supply hose for wear and/or leaks
before each use. Make sure that all connections are
tight and secure.
10. Do not use the tool for anything other than impact
wrench operations.
11. Do not carry out any alterations and/or modifications
to the tool.
12. Always disconnect the tool from air supply before
replacing any accessories, performing any repair and
maintenance, moving to another work area, or
passing the tool to another person.
13. Never use the tool if it is defective, damaged, or
operating abnormally.
14. Check for misalignment or binding of moving parts,
breakage of parts and any other condition that affects
the tool operation. If damaged, have the tool serviced
before using.
15. Keep working parts of the tool away from hands and
body.
16. Do not carry the tool by the air hose.
17. Do not apply excessive force of any kind to the tool.
Let the tool perform the work at the rate at which was
designed.
18. Do not remove any labels on the tool. Replace if they
become obscured or damaged.
19. Always maintain the tool with care. Keep it clean for
the best and safest performance.
20. This tool vibrates with use. Quick change couplings
should not be located directly at the air inlet, as they
add weight and could fail due to vibration.
21. Continuous operation of this tool might be harmful to
your hands or arms. Stop using the tool if discom-
fort, a tingling feeling or pain occurs. Resume work
after recovery. Seek medical advice if a serious
symptom occurs.
●Improper operation or maintenance of this tool could
result in personal injury. Read and understand all warnings
and operation instructions before using this tool.
●When using this tool, these basic safety precautions
should always be followed to reduce the risk of personal
injury.
Workplace conditions
1. Always work in a clean, dry, well-ventilated area free
of combustible materials. Never operate the tool near
flammable substances such as gasoline, naphtha,
cleaning solvent, etc.
2. Dress properly. Do not wear loose clothing. Tie up or
cover long hair, remove any jewelry, necklaces, etc.,
which might become caught by the tool.
3. Keep the work area well lit and free of clutter. Slips,
trips and falls are major causes of workplace injury.
Be aware of the total length of the hose as it may lay
on the ground in your walking path, or on the
working surface in use.
4. Ensure that there are no electrical cables, gas pipes,
etc., which can cause a hazard if damaged by use of
the tool.
5. Keep visitors a safe distance from the work area.
Keep children away.
Use of air tools
1. Stay alert and use common sense when operating the
tool. Watch what you are doing. Do not operate the
tool when you are tired or under the influence of
alcohol, drugs or medication.
2. Do not overreach. Keep proper footing and balance at
all times.
The safety alert symbol is used to identify safety
information about hazards that can result in personal
injury.
A signal word DANGER, WARNING or CAUTION is used
with the alert symbol to indicate the likelihood and the
potential severity of injury.
DANGER Indicates a hazardous situation that, if not
avoided, will result in death or serious injury. This signal
word is to be limited to the most extreme situations.
WARNING Indicates a hazardous situation that, if not
avoided, could result in death or serious injury.
CAUTION Indicates a hazardous situation that, if not
avoided, could result in minor or moderate injury.
NOTICE Indicates information considered important, but
not hazard-related.
WARNING
WARNING Read manufacturer's instructions.
Not for Reproduction

4 BRIGGSandSTRATTON.COM
Product Description
DESCRIPTION QUANTITY PART
1/2 in. Heavy Duty Impact Wrench
Anvil
Trigger
F/R Valve Knob
Air Inlet
Grease Cap
Warning Label
1
1
1
1
1
1
1
A
B
C
D
E
F
G
Air impact wrench safety instructions
1. Always use the impact wrench in the manner and for
the functions described in this manual.
2. Always ensure the wrench is not moving and discon-
nected from the air supply when changing sockets etc.
Only use impact sockets. Do not use standard sock-
ets.
3. Always finish tightening wheel nuts or engine parts
with a torque wrench or suitable spanner to the
correct torque as recommended by the vehicle
manufacturer.
4. Always avoid excessive use of the impact wrench.
When tightening a nut or bolt, never allow the wrench
to impact more than 8 times. This is to avoid over-
tightening. 3 to 4 impacts is normally sufficient.
5. Always ensure that the socket is correctly installed
onto the tool anvil before starting the tool.
6. Due to the possible presence of asbestos dust from
brake linings, always wear suitable respiratory
protection.
7. Never carry the impact wrench by the air supply hose.
8. Always disconnect the tool from the air supply when
changing impact sockets or when the wrench is not
required for immediate use in order to avoid acciden-
tal start.
9. Hold the tool correctly. Always use both hands to
control the impact wrench.
10. Always ensure that the wrench has come to a
complete stop before putting it down after use.
11. If necessary, use clamps or proper devices to securely
fix the workpiece when installing/tightening or
removing/loosening threaded fasteners on the
workpiece.
12. For overhead work, wear a safety helmet.
13. Do not discard the Operator's Manual. It contains
safety instructions.
14. Always store this product in a dry and safe place out
of reach of children or untrained operators.
5. Drain water from the air compressor tank daily, as
well as any condensation in the air lines. Water in the
air line may enter the tool and cause damage to the
tool mechanisms during operation.
6. Clean the tool air inlet screen filter for blockage
weekly. Clean if necessary.
7. A 3/8" (inner diameter) air hose is recommended for
air supply and airflow to get the optimum perfor-
mance of tool.
8. A long air hose (usually over 26 ft/8 m) may cause up
to 15 PSI/1.1 bar drop in pressure, so you need to set
the output pressure of the air compressor higher to
maintain the required working pressure at the tool.
9. Use proper hoses and fittings. It is not recommended
to use quick change couplings directly on the tool.
Tool vibration may cause damage or tool failure.
Instead, use a lead hose that can connect directly to
the tool, and a connect coupling between the air
supply and hose.
10. Check the hoses for wear or defects before each use.
Make certain that all connections are secure.
11. An individual air tool has its specification of air
consumption (CFM). Check the specifications of your
compressor to be sure that it can support both the
minimum CFM and PSI required.
Air Supply
1. Use only clean, dry, regulated compressed air as the
power source.
2. Make sure that the air compressor being used for the
tool operation supplies the correct output (CFM).
3. Have the tool in the "off" position when connecting
the tool to the air supply.
4. Use 90 PSI/6.3 bar working pressure for the tool.
High pressure and unclean air will shorten the life of
the tool due to faster wear of the tool.
WARNING Read and understand the air compres-
sor instruction manual thoroughly before using the
tool. It contains important safety information pertain-
ing to the use of the air compressor and air hoses.
NOTE Working pressure refers to the air line pressure
set to the tool when the tool is under working conditions.
Terms used throughout this manual are Cubic Feet per
Minute (CFM) and Pounds per Square Inch (PSI).
Please refer to the typical air system layout recom-
mended below.
A
E
D
G
C
B
F
6. Shut Off Valve
7. Whip Hose
8. Coupler Body And Connector
9. Drain Daily
10. 1/2" Or Larger Pipe And Fitting
AIR SYSTEM LAYOUT：
1. Air Tool
2. Air Hose 3/8" (I.D.)
3. Oiler
4. Pressure Regulator
5. Filter
11. Air Dryer
12. 1" Or Larger Pipe And Fitting
13. Air Compressor
14. Auto Drain
15. Drain Daily
6
9
13
14
15
8
7
12
10
5
4
3
2
11
1
WEAR APPROVED EYE
PROTECTION. USE ONLY
IMPACT SOCKETS
/ACCESSORIES. 90 PSI
MAXIMUM AIR PRESSURE.
HEARING PROTECTION
IS RECOMMENDED. AVOID
PROLONGED EXPOSURE
TO VIBRATION. READ
OPERATING INSTRUCTIONS.
WARNING
Not for Reproduction

D
NOTE This tool features a power regulator valve. Rotate the
F/R valve knob (D) until desired output is achieved. The
settings 1, 2, 3 are only for reference and do not denote a
specific power output. "Setting 1" is the least amount of power
while "Setting 4" is most amount of power. Rotate the F/R
valve knob (D) either clockwise or counterclockwise having
the triangle mark or hollow line on the knob (D) pointing at
any setting to get the desired power.
Figure 5
Forward/Reverse rotation is selected by pushing the F/R valve
knob in the direction shown by the arrow on the back of
the wrench.
1. How to install/tighten threaded fasteners
Push the F/R valve knob (D) backward. Press the
trigger (C). Then the tool anvil (B) runs clockwise.
(See Figure 5)
2. How to remove/loosen threaded fasteners
Push the F/R valve knob (D) forward. Press the
trigger (C). Then the tool anvil (B) runs counterclockwise.
(See Figure 5)
Operation Instructions
5
Assembly Instructions
4. If longer reach is necessary, use an extension bar
(not included) and then mount impact socket onto the bar.
3. Choose the correct impact socket (not provided) as needed
and mount it onto the anvil (B). (See Figure 3)
WARNING Only use impact sockets that have a
RPM rating equal to or greater than the tool itself.
5. Mount a leader hose (not included) by hand into the air
inlet (E). (See Figure 4)
NOTE Use thread sealant tape (not included) on the male
plug and tighten it with a wrench for airtight connection.
Do not overtighten.
6. Connect air supply hose to the leader hose.
7. Set the working pressure at 90 PSI/6.3 bar for best tool
performance.
Figure 4
E
Technical Specifications
SPECIFICATIONS
COMPONENT
1/2 in. (12.70 mm)
7,000 RPM
500 ft.-lbs.
6.5 CFM
90 PSI
1/4 in. (6.35 mm) NPT (F)
3/8 in. (9.53 mm) (inner diameter)
Square drive
Free speed
Max. torque
Avg. air consumption
Working pressure
Air inlet
Air hose
1. Remove the air inlet protective cap from the air inlet (E).
(See Figure 1)
E
Figure 1
2. Place 2 - 3 drops of air tool oil (not included) into the male
plug before each use. (See Figure 2)
Figure 2
Figure 3
B
Not for Reproduction

NOTE This tool also features a grease cap (F) on the protector
cover. Remove the screw in the grease cap with a hex key (not
provided). Use a grease gun (not included) and insert the gun
nozzle into the grease cap. Several drops of grease are
recommended for lubrication. After lubrication, replace the screw
secure and tight. This will help the hammer assembly to work in
good condition and extend too life. Lubricate the hammer
assembly once every working day. (See Figure 6)
Figure 6
F
6 BRIGGSandSTRATTON.COM
Care and Maintenance
An in-line oiler is recommended to be installed on air supply line as it increases tool life and keeps the tool in sustained opera-
tion. The in-line oiler should be regularly checked and filled with air-tool oil. Proper adjustment of the in-line oiler is performed
by placing a sheet of paper next to the tool's exhaust ports and holding the throttle open approximately 30 seconds. The in-line
oiler is properly set when a light stain of oil collects on the paper. Excessive amounts of oil should be avoided.
In the event that it becomes necessary to store the tool for an extended period of time, it should receive a generous amount of
lubrication at that time. The tool should be run for approximately 30 seconds to ensure oil has been evenly distributed through-
out the tool. The tool should be stored in a clean and dry environment.
Recommended lubricants: use air-tool oil or any other high-grade turbine oil containing moisture absorbent, rust inhibitors,
metal wetting agents and an EP (extreme pressure) additive.
Clean the tool all over with a cotton rag after each use. Keep the tool in a dry and safe place out of reach of children.
Troubleshooting
1. Flush the tool with air tool oil or gum solvent.
2. Lubricate the tool.
3. a. Adjust the regulator on the tool to the maximum setting if available.
b. Adjust the compressor regulator to the tool maximum of 90 PSI/6.3 bar.
4. Tighten and seal hose fittings if leaks are found. Use sealing tape.
5. a. Be sure the hose is the proper size. Long hose or tools using large volumes
of air may require a hose with an I.D. of 1/2 in. or larger depending on the
total length of the hoses.
b. Do not use a multiple number of hoses connected together with quick-
connect fittings. This causes additional pressure drops and reduces the tool
power. Directly connect the hoses together.
6. Have qualified technician replace the rotor blade.
7. Drain water from tank. (See the air compressor manual). Oil the tool and
continue running it until no water is evident. Oil the tool again and run for
1-2 seconds.
Tool runs
slowly or will
not operate.
1. Grit or gum in the tool.
2. No oil in the tool.
3. Low air pressure.
4. Air hose leaks.
5. Pressure drops.
6. Worn rotor blade.
7. Moisture blowing out
of the tool exhaust.
PROBLEM CORRECTIVE ACTIONPOSSIBLE CAUSE
Not for Reproduction

Exploded Diagram and Parts List
Part No.
Description Qty.
Part No.
Description Qty.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Main housing
Trigger sleeve
Trigger
Trigger shaft
Screw
F/R valve knob
Valve bushing
O-ring
Valve
Spring
Steel ball
F/R valve knob
Valve seat
Throttle vavle
Valve spring
Exhaust deflector
Washer
Air inlet
Screw
O-ring
Dowel pin
Gasket
1
1
1
1
2
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Retainer ring
Rear rotor bearing
Rear plate
Cylinder
Rotor
Rotor blade
Front plate
Bearing
Washer
Washer
Hammer
Hammer cage
Hammer pin
Anvil
O-ring
Retainer O-ring
Anvil bushing
Gasket
Protector cover
Spacer
Cap screw
Soft grip
1
1
1
1
1
6
1
1
1
1
2
1
2
1
1
1
1
1
1
4
4
1
7
Not for Reproduction

Briggs & Stratton™ Air Tool Warranty Policy
LIMITED WARRANTY
These are our standard warranty terms, but occasionally there may be additional warranty coverage that was not determined at
time of publication. For a listing of current warranty terms for your air tool, go to BRIGGSandSTRATTON.COM
This Limited warranty does not include the following:
A. Parts that are worn or broken or which have become inoperative due to abuse, misuse, accidental damage, neglect or lack of
proper installation, operation or maintenance (as outlined in the applicable owner’s manual or operating instructions) or product
that has been used for industrial, professional, commercial or rental purposes;
B. Normal wear and tear or expendable parts or accessories that may be supplied with the product which are expected to become
inoperative or unusable after a reasonable period of use;
C. Routine maintenance and consumable items such as, but not limited to fuel, lubricants, valves, belts, knobs, nuts, uids,
tune-ups, or adjustments;
D. Damage caused by repairs made or attempted by persons not authorized by the manufacturer;
E. Product that was sold to the original purchaser as reconditioned or refurbished product (unless otherwise specied in writing);
F. Product or parts thereof if any part from another manufacturer has been installed or any repairs or alterations have been made
or attempted by unauthorized persons;
G. Normal deterioration of the exterior nish such as, but not limited to, scratches, dents, paint chips, nor any corrosion or
discoloring by heat, abrasive and chemical cleaners;
H. Component parts sold by and identied as the product of another company, which shall be covered under the other product
manufacturer's warranty, if any.
For questions about our warranty on this product, contact us at:
Alton Industry LTD. Group
1031 North Raddant Road
Batavia Illinois 60510
888-899-0146
[email protected]
www.altonindustries.com
January, 2016
Briggs & Stratton™ is a trademark of BRIGGS & STRATTON CORPORATION and is used under license to Alton Industry
Co. Ltd® Alton Industry Co. Ltd warrants this Briggs & Stratton brand product for a period of one year from the date of
original retail purchase against defects in materials and workmanship. Subject to the conditions and limitations described
below, if Alton Industry Co. Ltd determines this product is covered under this warranty, it will be replaced with the same
model or one of equal value or specication, at Alton Industry Co. Ltd's option. Alton Industry Co. Ltd will bear the cost of
replacement. The purchaser must contact Alton Industry Co. Ltd® for all warranty authorizations.
There is no other express warranty. Implied warranties, including those of merchantability and fitness for a particular
purpose, are limited to one year, or to the extent permitted by law. Liability for incidental or consequential damages are
excluded to the extent exclusion is permitted by law. Some states or countries do not allow limitations on how long an
implied warrant lasts, and some states of countries do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitation and exclusion may not apply to you. This warranty gives you specic legal rights and you
may also have other rights which vary from state to state or country to country.
Save your proof of purchase receipt. If you do not provide proof of the initial purchase date at the time warranty service is
requested, the manufacturing date of the product will be used to determine the warranty period. Product registration is not
required to obtain warranty service on Briggs & Stratton products.
Not for Reproduction