Central Pneumatic 95141 Installation manual

3/4” HEAVY-DUTY
IMPACT WRENCH
95141
SET UP AND OPERATING INSTRUCTIONS
Distributed exclusively by Harbor Freight Tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our website at: http://www.harborfreight.com
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright©2006 by Harbor Freight Tools®. All rights reserved. No portion of this manual or any artwork
contained herein may be reproduced in any shape or form without the express written consent of
Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein. Tools required for
assembly and service may not be included.
For technical questions or replacement parts, please call 1-800-444-3353.
Manual revised 11h

SKU 95141 For technical questions, please call 1-800-444-3353. Page 2
SAVE THIS MANUAL
Keep this manual for the safety warn-
ings and precautions, assembly, operat-
ing, inspection, maintenance and cleaning
procedures. Write the product’s serial
number in the back of the manual near the
assembly diagram (or month and year of
purchase if product has no number). Keep
this manual and the receipt in a safe and
dry place for future reference.
Safety Alert Symbol and Signal
Words
In this manual, on the labeling,
and all other information provid-
ed with this product:
This is the safety alert
symbol. It is used to alert
you to potential personal
injury hazards. Obey all
safety messages that
follow this symbol to avoid
possible injury or death.
DANGER indicates
a hazardous
situation which, if not
avoided, will result in death or
serious injury.
WARNING
indicates a
hazardous situation which, if
not avoided, could result in
death or serious injury.
CAUTION, used
with the safety
alert symbol, indicates a
hazardous situation which, if
not avoided, could result in
minor or moderate injury.
NOTICE is used to
address practices
not related to personal injury.
CAUTION, without
the safety alert
symbol, is used to address
practices not related to
personal injury.
IMPORTANT SAFETY
INSTRUCTIONS
INSTRUCTIONS PERTAINING
TO A RISK OF FIRE,
ELECTRIC SHOCK, OR
INJURY TO PERSONS
WARNING – When using tools, basic pre-
cautions should always be followed,
including the following:
General
a. To reduce the risks of electric
shock, re, and injury to persons,
read all the instructions before us-
ing the tool.
Work area
a. Keep the work area clean and well
lighted. Cluttered benches and dark
areas increase the risks of electric
shock, re, and injury to persons.
b. Do not operate the tool in explo-
sive atmospheres, such as in the
presence of ammable liquids,
gases, or dust. The tool is able to
create sparks resulting in the ignition
of the dust or fumes.
c. Keep bystanders, children, and
visitors away while operating the

SKU 95141 For technical questions, please call 1-800-444-3353. Page 3
tool. Distractions are able to result in
the loss of control of the tool.
Personal safety
a. Stay alert. Watch what you are do-
ing and use common sense when
operating the tool. Do not use the
tool while tired or under the inu-
ence of drugs, alcohol, or medica-
tion. A moment of inattention while
operating the tool increases the risk
of injury to persons.
b. Dress properly. Do not wear loose
clothing or jewelry. Contain long
hair. Keep hair, clothing, and
gloves away from moving parts.
Loose clothes, jewelry, or long hair
increases the risk of injury to persons
as a result of being caught in moving
parts.
c. Avoid unintentional starting. Be
sure the switch is off before con-
necting to the air supply. Do not
carry the tool with your nger on the
switch or connect the tool to the air
supply with the switch on.
d. Remove adjusting keys and
wrenches before turning the tool
on. A wrench or a key that is left at-
tached to a rotating part of the tool
increases the risk of personal injury.
e. Do not overreach. Keep proper
footing and balance at all times.
Proper footing and balance enables
better control of the tool in unexpect-
ed situations.
f. Use safety equipment. A
dust mask, non-skid safety
shoes and a hard hat must
be used for the applicable
conditions. Wear heavy-duty work
gloves during use.
g. Always wear eye protec-
tion. Wear ANSI-ap-
proved safety goggles.
h. Always wear hearing
protection when using
the tool. Prolonged expo-
sure to high intensity noise
is able to cause hearing loss.
Tool use and care
a. Use clamps or another practical
way to secure and support the
workpiece to a stable platform.
Holding the work by hand or against
the body is unstable and is able to
lead to loss of control.
b. Do not force the tool. Use the
correct tool for the application. The
correct tool will do the job better and
safer at the rate for which the tool is
designed.
c. Do not use the tool if the switch
does not turn the tool on or off.
Any tool that cannot be controlled
with the switch is dangerous and
must be repaired.
d. Disconnect the tool from the air
source before making any adjust-
ments, changing accessories, or
storing the tool. Such preventive
safety measures reduce the risk of
starting the tool unintentionally. Turn
off and detach the air supply, safely
discharge any residual air pressure,
and release the throttle and/or turn
the switch to its off position before
leaving the work area.

SKU 95141 For technical questions, please call 1-800-444-3353. Page 4
e. Store the tool when it is idle out of
reach of children and other un-
trained persons. A tool is dangerous
in the hands of untrained users.
f. Maintain the tool with care. Keep a
cutting tool sharp and clean. A prop-
erly maintained tool, with sharp cut-
ting edges reduces the risk of binding
and is easier to control.
g. Check for misalignment or bind-
ing of moving parts, breakage of
parts, and any other condition that
affects the tool’s operation. If dam-
aged, have the tool serviced before
using. Many accidents are caused
by poorly maintained tools. There is a
risk of bursting if the tool is damaged.
h. Use only accessories that are
identied by the manufacturer for
the specic tool model. Use of an
accessory not intended for use with
the specic tool model, increases the
risk of injury to persons.
Service
a. Tool service must be performed
only by qualied repair personnel.
b. When servicing a tool, use only
identical replacement parts. Use
only authorized parts.
c. Use only the lubricants supplied
with the tool or specied by the
manufacturer.
Air source
a. Never connect to an air
source that is capable of
exceeding 200 psi. Over
pressurizing the tool may
cause bursting, abnormal operation,
breakage of the tool or serious injury
to persons. Use only clean, dry,
regulated compressed air at the rated
pressure or within the rated pressure
range as marked on the tool. Always
verify prior to using the tool that the
air source has been adjusted to the
rated air pressure or within the rated
air-pressure range.
b. Never use oxygen, carbon dioxide,
combustible gases or any bottled
gas as an air source for the tool.
Such gases are capable of explosion
and serious injury to persons.
SAVE THESE
INSTRUCTIONS.
SYMBOLS AND
SPECIFIC SAFETY
INSTRUCTIONS
Symbol Denitions
Symbol Property or statement
noNo-load speed
.../min Revolutions or reciprocation per
minute
PSI Pounds per square inch of pressure
ft-lb Foot-pounds of torque
BPM Blows per minute
CFM Cubic Feet per Minute ow
SCFM Cubic Feet per Minute ow at
standard conditions
NPT National pipe thread, tapered
Chart continued in next column.

SKU 95141 For technical questions, please call 1-800-444-3353. Page 5
Symbol Denitions
Symbol Property or statement
NPS National pipe thread, straight
WARNING marking concerning Risk
of Eye Injury. Wear ANSI-approved
eye protection.
WARNING marking concerning Risk
of Hearing Loss. Wear hearing
protection.
WARNING marking concerning Risk
of Respiratory Injury. Wear NIOSH-
approved dust mask/respirator.
WARNING marking concerning Risk
of Explosion.
Specic Safety Instructions
1. The warnings and precautions dis-
cussed in this manual cannot cover
all possible conditions and situations
that may occur. It must be under-
stood by the operator that common
sense and caution are factors which
cannot be built into this product, but
must be supplied by the operator.
2. WARNING: The brass components
of this product contain lead, a chemi-
cal known to the State of California
to cause birth defects (or other repro-
ductive harm). (California Health &
Safety code § 25249.5, et seq.)
3. Only use with accessories rated to
handle the forces exerted by this tool
during operation. Other accessories
not designed for the forces gener-
ated may break and forcefully launch
pieces.
4. Attach all accessories properly to the
tool before connecting the air sup-
ply. A loose accessory may detach or
break during operation.
5. Obey the manual for the air compres-
sor used to power this tool.
6. Install an in-line shutoff valve to allow
immediate control over the air supply
in an emergency, even if a hose is
ruptured.
7. Use this tool with both hands only.
Using tools with only one hand can
result in loss of control.
8. Do not lay the tool down until it has
come to a complete stop. Moving
parts can grab the surface and pull
the tool out of your control.
Vibration Precautions
This tool vibrates during use. Re-
peated or long-term exposure to vibra-
tion may cause temporary or permanent
physical injury, particularly to the hands,
arms and shoulders. To reduce the risk of
vibration-related injury:
1. Anyone using vibrating tools regu-
larly or for an extended period should
rst be examined by a doctor and
then have regular medical check-
ups to ensure medical problems are
not being caused or worsened from
use. Pregnant women or people
who have impaired blood circulation
to the hand, past hand injuries, ner-
vous system disorders, diabetes, or
Raynaud’s Disease should not use
this tool. If you feel any symptoms
related to vibration (such as tingling,
numbness, and white or blue ngers),
seek medical advice as soon as pos-
sible.
2. Do not smoke during use. Nico-
tine reduces the blood supply to the
hands and ngers, increasing the risk
of vibration-related injury.

SKU 95141 For technical questions, please call 1-800-444-3353. Page 6
3. Wear suitable gloves to reduce the
vibration effects on the user.
4. Use tools with the lowest vibration
when there is a choice between dif-
ferent processes.
5. Include vibration-free periods each
day of work.
6. Grip tool as lightly as possible (while
still keeping safe control of it). Let
the tool do the work.
7. To reduce vibration, maintain tool as
explained in this manual. If abnormal
vibration occurs, stop immediately.
SAVE THESE
INSTRUCTIONS.
SPECIFICATIONS
Maximum Air Pressure 90 PSI
Air Inlet 3/8”-18 NPT
Maximum Speed* 4300 RPM
Air Consumption 9.3 CFM @ 90 PSI
Drive Size 3/4” Square Drive
Impact Mechanism Jumbo Hammer
Anvil Retainer Type Hog Ring
Maximum Torque 1300 ft-lb
Torque Range 200-650 ft-lb
Blows Per Minute 960
Recommended Hose
Size
1/2” Inside Diameter
(Not Included)
* Maximum speed, blows per minute and torque at
stated maximum air pressure. Excess air pressure is
hazardous and may cause the tool to exceed stated
maximum speed.
INITIAL TOOL SET UP/
ASSEMBLY
Read the ENTIRE IMPORTANT
SAFETY INFORMATION
section at the beginning of this
manual including all text under
subheadings therein before set
up or use of this product.
Unpacking
When unpacking, make sure that
the item is intact and undamaged. If any
parts are missing or broken, please call
Harbor Freight Tools at the number shown
throughout the manual as soon as pos-
sible.
Air Supply
TO PREVENT
EXPLOSION:
Use only clean, dry, regulated,
compressed air to power this
tool. Do not use oxygen,
carbon dioxide, combustible
gases, or any other bottled
gas as a power source for this
tool.
1. Incorporate an in-line oiler, shut-off
valve, regulator with pressure gauge,
and lter for best service, as shown in
the diagram above. An in-line shut-
off valve is an important safety

SKU 95141 For technical questions, please call 1-800-444-3353. Page 7
device because it controls the air
supply even if the air hose is rup-
tured.
Note: If an automatic oiler system is not
used, add a few drops of Pneumatic
Tool Oil to the airline connection be-
fore operation. Add a few more drops
after each hour of continual use.
2. Attach an air hose to the compres-
sor’s air outlet. Connect the air hose
to the air inlet of the tool. Other com-
ponents, such as a connector and
quick coupler, will make operation
more efcient, but are not required.
WARNING! TO PREVENT SERIOUS
INJURY FROM ACCIDENTAL
OPERATION:
Do not install a female quick
coupler on the tool. Such a coupler
contains an air valve that will allow
the air tool to retain pressure and
operate accidentally after the air
supply is disconnected.
Note: Air ow, and therefore tool perfor-
mance, can be hindered by under-
sized air supply components.
3. The air hose must be long enough
to reach the work area with enough
extra length to allow free movement
while working.
4. Turn the tool’s throttle or switch to the
off position; refer to Operation section
for description of controls.
5. Close the in-line safety valve be-
tween the compressor and the tool.
6. Turn on the air compressor according
to the manufacturer’s directions and
allow it to build up pressure until it
cycles off.
7. Adjust the air compressor’s output
regulator so that the air output is
enough to properly power the tool,
but the output will not exceed the
tool’s maximum air pressure at any
time. Adjust the pressure gradually,
while checking the air output gauge
to set the right pressure range.
8. Inspect the air connections for leaks.
Repair any leaks found.
9. If the tool will not be used at this
time, turn off and detach the air sup-
ply, safely discharge any residual air
pressure, and release the throttle
and/or turn the switch to its off posi-
tion to prevent accidental operation.
Note: Residual air pressure should not be
present after the tool is disconnected
from the air supply. However, it is a
good safety measure to attempt to
discharge the tool in a safe fashion
after disconnecting to ensure that the
tool is disconnected and unpowered.

SKU 95141 For technical questions, please call 1-800-444-3353. Page 8
OPERATING INSTRUCTIONS
1. Always wear eye protec-
tion. Wear ANSI-approved
safety goggles.
2. Always wear hearing
protection when using the
tool. Prolonged exposure
to high intensity noise is
able to cause hearing loss.
3. Whenever possible, secure the work-
piece in place, using a vise or clamps
(not included).
4. Make sure the Impact Wrench is
disconnected from its air supply hose
prior to installing or changing sockets
(not included) on the tool.
5. Select the proper 3/4” impact socket
for the job at hand. Then, rmly
insert the socket onto the Anvil (39) of
the Impact Wrench. (See Figure C.)
6. The Impact Wrench features a For-
ward/Reverse Valve (21) that allows
you to change the rotational direction
of the tool. For a forward (clock-
wise) rotation, move the Forward/Re-
verse Valve to the left. For a reverse
(counterclockwise) rotation, move
the Forward/Reverse Valve to the
right. (See Figure C.)
7. Connect the air supply hose (not
included) to the air inlet.
(See Figure C.)
8. Turn on the air compressor, and set
its regulator at 90 PSI.
Do not exceed 90 PSI.
9. Wait until the air compressor’s regula-
tor reaches 90 PSI. Then, insert the
previously installed socket onto the
nut that is to be loosened or tight-
ened.
10. Make sure to hold the Impact Wrench
rmly with both hands, as torque from
the tool will cause the tool to twist.
Then, squeeze the Trigger (27) to
turn on the tool. (See Figure C.)
11. To avoid damaging the Impact
Wrench, always make sure the
tool is at a complete stop before
changing the rotational direction.
SOCKET
(NOT INCLUDED)
AIR SUPPLY HOSE
(NOT INCLUDED)
TRIGGER
(27)
FORWARD/REVERSE VALVE
(21)
FIGURE C

SKU 95141 For technical questions, please call 1-800-444-3353. Page 9
12. When nished, release the Trigger
(27) to stop the Impact Wrench.
13. Turn off the air compressor. Squeeze
the Trigger (27) of the Impact Wrench
to release any remaining air pres-
sure in the system and tool. Discon-
nect the tool from its air supply hose.
Then, remove the socket from the
tool and store the socket in a safe
location. (See Figure C.)
14. Make sure to store the Impact
Wrench in a clean, dry, safe location
out of reach of children and other
unauthorized people.
INSPECTION, MAINTENANCE,
AND CLEANING
1. WARNING! Always wear ANSI
approved safety impact goggles
when performing any inspection,
maintenance, or cleaning proce-
dures.
2. WARNING! Prior to performing any
inspection, maintenance, or cleaning
of the Impact Wrench, make sure to
disconnect the air hose from the tool.
Then, squeeze the Trigger (27) again
to release any compressed air in the
system and tool.
3. To clean the exterior of the Impact
Wrench, wipe with a clean, damp
cloth using a mild detergent or mild
solvent. Do not immerse the tool in
liquids.
4. When storing, always store the Riv-
eter in a clean, dry, safe location out
of reach of children.
5. CAUTION! All maintenance, service,
and repairs not mentioned in this
manual must only be performed by a
qualied service technician.

SKU 95141 For technical questions, please call 1-800-444-3353. Page 10
TROUBLESHOOTING
Problem Possible Solution
Impact Wrench does not turn on when Trigger is
squeezed.
1. Turn air compressor and set its regulator is set
at 90 PSI.
2. Secure all air system connections are and
make sure that there are no leaks.
3. Make sure the Air Filter (44) within the Air Inlet
(45) is not plugged.
Releasing the Trigger on the Impact
Wrench does not turn off the tool.
Turn off the air compressor. Release any
remaining compressed air from the system and
tool. Disconnect the air supply hose from the
tool. Do not use the tool until a qualied service
technician repairs the tool.
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST
AND ASSEMBLY DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEI-
THER THE MANUFACTURER OR DISTRIBUTOR MAKES ANY REPRESENTATION
OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS QUALIFIED
TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER
AND/OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS AND PARTS
REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED
TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISKS AND
LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT
OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER INSTAL-
LATION OF REPLACEMENT PARTS THERETO.

SKU 95141 For technical questions, please call 1-800-444-3353. Page 11
PARTS LIST
* Sold only as an assembly.
** Sold only as an assembly.
Part # Description Qty. Part # Description Qty.
1 Bushing 1 25 Spacer 1
2 Spring Ring 2 26 Valve Bushing 1
3 Bearing 1 27 Trigger 1
4 Front End Plate 1 28 Gasket 1
5 Pin 1 29 Board 1
6 Cylinder 1 30 Screw 2
7 Pin 1 31 Blade 6
8 Rotor 1 32 Spring Washer 4
9 Rear End Plate 1 33 Screw 4
10 Bearing 1 34 Clutch Housing 1
11 Spacer 1 35 Front Gasket 1
12 Rear Gasket 1 36 Front Shaft Bushing 1
13 Pistol Grip Handle 1 37 Spring Ring 1
14 Trademark 1 38 O-Ring 1
15 Guide 1 39 Anvil 1
16 Screw 1 40 Impact Pin 2
17 Spring Washer 1 41 Impact Cage 1
18 Speed Conditioner 1 42 Impact Dog 1
19 Reverse Valve Bushing 1 43 Spacer 1
20* O-Ring 2 44** Air Filter 1
21* Forward/Reverse Valve 1 45** Air Inlet 1
22 Exhaust Deector 1 46 O-Ring 1
23 Roll Pin 1 47 Valve Spring 1
24 Screw 1 48 Air Closer 1
NOTE: Some parts are listed and shown for illustration purposes only, and are not
available individually as replacement parts.

SKU 95141 For technical questions, please call 1-800-444-3353. Page 12
ASSEMBLY DIAGRAM
*
**
**
*
90 Day Warranty
Harbor Freight Tools Co. makes every effort to
assure that its products meet high quality and
durability standards, and warrants to the original
purchaser that this product is free from defects in
materials and workmanship for the period of 90
days from the date of purchase. This warranty does
not apply to damage due directly or indirectly, to
misuse, abuse, negligence or accidents, repairs or
alterations outside our facilities, criminal activity,
improper installation, normal wear and tear, or
to lack of maintenance. We shall in no event be
liable for death, injuries to persons or property, or
for incidental, contingent, special or consequential
damages arising from the use of our product.
Some states do not allow the exclusion or limitation
of incidental or consequential damages, so the
above limitation of exclusion may not apply to
you. THIS WARRANTY IS EXPRESSLY IN LIEU
OF ALL OTHER WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING THE WARRANTIES OF
MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product
or part must be returned to us with transportation
charges prepaid. Proof of purchase date and an
explanation of the complaint must accompany the
merchandise. If our inspection veries the defect,
we will either repair or replace the product at our
election or we may elect to refund the purchase
price if we cannot readily and quickly provide
you with a replacement. We will return repaired
products at our expense, but if we determine there
is no defect, or that the defect resulted from causes
not within the scope of our warranty, then you must
bear the cost of returning the product.
This warranty gives you specic legal rights and
you may also have other rights which vary from
state to state.