Central Pneumatic CENTRAL PNEUMATIC 68128 Installation manual

1” PINLESS
AIR IMPACT WRENCH
68128
SET UP AND OPERATING INSTRUCTIONS
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©2010 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.

SKU 68128 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
To reduce the risks of electrica.
shock, re, and injury to persons,
read all the instructions before us-
ing the tool.
Work area
Keep the work area clean and wella.
lighted. Cluttered benches and dark
areas increase the risks of electric
shock, re, and injury to persons.
Do not operate the tool in explo-b.
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.
Keep bystanders, children, andc.
visitors away while operating the

SKU 68128 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
Stay alert. Watch what you are do-a.
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.
Dress properly. Do not wear looseb.
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.
Avoid unintentional starting. Bec.
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.
Remove adjusting keys andd.
wrenches before turning the tool
on. A wrench or a key that is left
attached to a rotating part of the tool
increases the risk of personal injury.
Do not overreach. Keep propere.
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
Use clamps or another practicala.
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.
Do not force the tool.b. 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.
Do not use the tool if the Triggerc.
switch does not turn the tool on or
off. Any tool that cannot be controlled
with the Trigger is dangerous and
must be repaired.
Disconnect the tool from the aird.
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 Trigger to its off position before
leaving the work area.

SKU 68128 For technical questions, please call 1-800-444-3353. Page 4
Store the tool when it is idle out ofe.
reach of children and other un-
trained persons. A tool is dangerous
in the hands of untrained users.
Maintain the tool with care.f. A
properly maintained tool is easier to
control.
Check for misalignment or bind-g.
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.
Use only accessories that areh.
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
Tool service must be performeda.
only by qualied repair personnel.
When servicing a tool, use onlyb.
identical replacement parts. Use
only authorized parts.
Use only the lubricants suppliedc.
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.
Never use oxygen, carbon dioxide,b.
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
NPS National pipe thread, straight
Chart continued in next column.

SKU 68128 For technical questions, please call 1-800-444-3353. Page 5
Symbol Denitions
Symbol Property or statement
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
The warnings and precautions dis-1.
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.
WARNING: The brass components2.
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.)
Only use with accessories rated to3.
handle the forces exerted by this tool
during operation. Other accessories
not designed for the forces gener-
ated may break and forcefully launch
pieces.
Attach all accessories properly to the4.
tool before connecting the air sup-
ply. A loose accessory may detach or
break during operation.
Obey the manual for the air compres-5.
sor used to power this tool.
Install an in-line shutoff valve to allow6.
immediate control over the air supply
in an emergency, even if a hose is
ruptured.
Use this tool with both hands only.7.
Using tools with only one hand can
result in loss of control.
Do not lay the tool down until it has8.
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:
Anyone using vibrating tools regu-1.
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.
Do not smoke during use. Nico-2.
tine reduces the blood supply to the
hands and ngers, increasing the risk
of vibration-related injury.

SKU 68128 For technical questions, please call 1-800-444-3353. Page 6
Wear suitable gloves to reduce the3.
vibration effects on the user.
Use tools with the lowest vibration4.
when there is a choice.
Include vibration-free periods each5.
day of work.
Grip tool with both hands as lightly as6.
possible (while still keeping safe con-
trol of it). Let the tool do the work.
To reduce vibration, maintain tool as7.
explained in this manual. If abnormal
vibration occurs, stop immediately.
SAVE THESE
INSTRUCTIONS.
SPECIFICATIONS
Maximum Air Pressure 90 PSI
Air Inlet 1/2” -14 NPT
Drive Size 1”
Maximum Speed* 3200 RPM / 557 BPM
(Blows Per Minute)
Average Air
Consumption 10 CFM @ 90 PSI
Recommended Min.
Air Hose 1/2” (Not Supplied)
Torque 2000 ft.-lb.
Speed Settings Three
* Maximum speed at stated maximum air pressure. Ex-
cess air pressure is hazardous and may cause the tool
to exceed stated maximum speed.
Recommended Min. Air Hose: 1/2” (Not Supplied)
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.
Note: For additional information regarding
the parts listed in the following pages,
refer to the Assembly Diagram near
the end of this manual.
Unpacking
When unpacking, make sure the item
is intact and undamaged. If any parts
are missing or broken, call Harbor Freight
Tools at 1-800-444-3353.
This air tool may be shipped with a•
protective plug covering the air inlet.
Remove this plug before set up.

SKU 68128 For technical questions, please call 1-800-444-3353. Page 7
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.
Quick
Coupler
Recommended Air Line Components
Regulator with
Pressure Gauge
Quick
Coupler Air Hose
on Reel
Valve FilterOiler
Male
Connector
Tool
Air
Compressor
Male
Connector
Incorporate a lter, regulator with 1.
pressure gauge, oiler, in-line shutoff
valve, and quick coupler for best ser-
vice, as shown in the diagram above.
An in-line shutoff ball valve is an
important safety device because it
controls the air supply even if the
air hose is ruptured. The shutoff
valve should be a ball valve be-
cause it can be closed quickly.
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.
Attach an air hose to the compres-2.
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.
The air hose must be long enough3.
to reach the work area with enough
extra length to allow free movement
while working.
Close the in-line safety valve be-4.
tween the compressor and the tool.
Turn on air compressor according to5.
manufacturer’s directions and allow it
to build up pressure until it cycles off.
Adjust the air compressor’s output 6.
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.
Inspect the air connections for leaks.7.
Repair any leaks found.
If the tool will not be used at this time,8.
release the Trigger, close the shut-off
valve, press the Trigger to discharge

SKU 68128 For technical questions, please call 1-800-444-3353. Page 8
trapped line pressure, and detach air
supply hose from the air supply.
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.
OPERATING INSTRUCTIONS
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.
Inspect tool before use, looking
for damaged, loose, and
missing parts. If any problems
are found, do not use tool until
repaired.
Tool Set Up
TO PREVENT
SERIOUS INJURY:
Do not adjust or tamper with
any control or component in a
way not specically explained
within manual. Improper
adjustment can result in tool
failure or other serious
hazards.
For added stability, attach Side Han-1.
dle (5) to side of Hammer Case (4)
using Bolts (6) and Washers (7). .
Work Piece and Work Area Set Up
Designate a work area that is clean1.
and well-lit. The work area must not
allow access by children or pets to
prevent distraction and injury.
Route air hose along a safe route2.
to reach work area without creat-
ing a tripping hazard or exposing air
hose to possible damage. Also avoid
sharp bends and do not place items
on hose during use.
The air hose must be long enough3.
to reach the work area with enough
extra length to allow free movement
while working.
There must not be hazardous objects 4.
(such as utility lines) nearby that will
present a hazard while working.
General Operating Instructions
WARNING!1. Use only 1” Drive Impact
type sockets (not supplied).
If an automatic oiler is not used,2. add
a few drops of Pneumatic Tool Oil
to the airline connection before use.
Add a few drops more after each
hour of continual use.
Push and snap socket (not included)3.
onto Anvil (13).
This Impact Wrench can be used in4.
either Forward or Reverse direction.
To operate in Forward, turn the Direc-
tion Knob (33) under the housing to
the desired Forward speed.
NOTE: There are three torque settings
for the Forward direction. To tighten,
place the socket over the hex nut you
wish to tighten.

SKU 68128 For technical questions, please call 1-800-444-3353. Page 9
For Reverse, turn the Direction Knob5.
to the desired Reverse speed.
NOTE: There are three torque settings
for the Reverse direction. To loosen,
set the Regulator Knob to one of the
Reverse settings.
Hold the Side Handle rmly and place 6.
other hand around Handle (28). Gen-
tly squeeze the Trigger (49).
Place socket (not included) over7.
desired nut, hold handle rmly and
gently squeeze the Trigger.
If tool requires more force to8.
accomplish task in Forward or
Reverse setting, verify that the tool
receives sufcient, unobstructed
airow (CFM) and increase the
pressure (PSI) output of regulator up
to maximum air pressure rating of the
tool.
CAUTION! TO PREVENT TOOL
AND ACCESSORY FAILURE,
RESULTING IN INJURY:
Do not exceed tool’s maximum air
pressure rating (90 PSI).
If tool still does not have sufcient
force at maximum pressure and
sufcient airow, then a larger tool
may be required.
When the nut is tightened or loos-9.
ened, release the Trigger. Use a
torque wrench to check the torque of
the tightened nut.
To prevent accidents, turn off tool,10.
detach air supply, safely discharge
any residual air pressure in tool, and
release Trigger after use. Clean ex-
ternal surfaces of tool with clean, dry
cloth, and apply a thin coat of tool oil
to the anvil end. Store indoors out of
children’s reach.

SKU 68128 For technical questions, please call 1-800-444-3353. Page 10
USER-MAINTENANCE
INSTRUCTIONS
Procedures not specically
explained in this manual
must be performed only by a
qualied technician.
TO PREVENT
SERIOUS INJURY
FROM ACCIDENTAL
OPERATION: Turn off tool,
detach air supply, safely
discharge any residual air
pressure in tool, and release
Trigger before performing any
inspection, maintenance, or
cleaning procedures.
TO PREVENT SERIOUS
INJURY FROM TOOL
FAILURE: Do not use
damaged equipment. If
abnormal noise, vibration,
or leaking air occurs, have
problem corrected before
further use.
TO PREVENT EXPLOSION:
Lubricate tool only with
specied lubricants.
Lubricate the air inlet
using only pneumatic tool
oil. Lubricate the internal
mechanism using only
white lithium grease. Other
lubricants may damage the
mechanism and may be
highly ammable, causing an
explosion.
Note: These procedures are in addition to
the regular checks and maintenance
explained as part of the regular
operation of the air-operated tool.
Daily - Air Supply Maintenance:1.
Every day, perform maintenance
on the air supply according to
the component manufacturers’
instructions. The lubricator’s oil
level needs to be maintained and
the moisture lter must be regularly
drained. Performing routine
maintenance on the air supply will
allow the tool to operate more safely
and will also reduce wear on the tool.
Quarterly (every 3 months) -2.
Tool Disassembly, Cleaning,
and Inspection: Have the internal
mechanism cleaned, inspected, and
lubricated by a qualied technician.
Store Impact Wrench in clean, dry3.
and safe location out of reach of
children.

SKU 68128 For technical questions, please call 1-800-444-3353. Page 11
Troubleshooting
Problem Possible Causes Likely Solutions
Decreased output. Not enough air pressure and/1.
or air ow.
Obstructed trigger.2.
Incorrect lubrication or not3.
enough lubrication.
Blocked air inlet screen (if4.
equipped).
Air leaking from loose housing,5.
hose or connections.
Mechanism contaminated.6.
Vane wear or damage.7.
Check for loose connections and make sure1.
that air supply is providing enough air ow
(CFM) at required pressure (PSI) to the tool’s
air inlet. Do not exceed 90 PSI maximum
air pressure.
Clean around trigger to ensure free2.
movement.
Lubricate using air tool oil and grease3.
according to directions.
Clean air inlet screen of buildup.4.
Make sure housing is properly assembled5.
and tight. Repair hose/connection air leaks.
Have qualied technician clean and lubricate 6.
mechanism. Install in-line lter in air supply
as stated in Initial Set Up: Air Supply.
Replace all vanes.7.
Housing heats
during use.
Incorrect lubrication or not1.
enough lubrication.
Worn parts.2.
Lubricate using air tool oil and grease1.
according to directions.
Have qualied technician inspect internal 2.
mechanism and replace parts as needed.
Severe air
leakage.
Cross-threaded housing1.
components.
Loose housing.2.
Damaged valve or housing.3.
Dirty, worn or damaged valve.4.
Check for incorrect alignment and uneven1.
gaps. If cross-threaded, disassemble and
replace damaged parts before use.
Tighten housing assembly. If housing cannot2.
tighten properly, internal parts may be
misaligned.
Replace damaged components.3.
Clean or replace valve assembly.4.
Follow all safety precautions whenever diagnosing or servicing the tool.
Disconnect air supply before service.

SKU 68128 For technical questions, please call 1-800-444-3353. Page 12
Part Description Q’ty
1 Hex Screw 4
2 Gasket 8
3 Nut 4
4 Hammer Case 1
5 Side Handle 1
6 Bolt 4
7 Washer 4
8 Gasket 1
9 Oil Seal 1
10 Anvil Bushing 1
11 Circlip 1
12 O-Ring 1
13 Anvil 1
14 Hammer Bushing 1
15 Hammer 1
16 Cam 1
17 Hammer Cage 1
18 Gasket 1
19 Housing 1
20 Bearing 2
21 Rear End Plate 2
22 Vane 6
23 Rotor 1
24 Pin 2
25 Cylinder 1
Part Description Q’ty
26 Pin 1
27 Gasket 1
28 Handle 1
29 Pin 1
30 Hex Screw 2
31 O-Ring 2
32 Valve Bushing 1
33 Direction Knob 1
34 O-Ring 1
35 Lever Pin 1
36 Steel Ball 1
37 Spring 1
38 Throttle Bushing 1
39 Throttle Valve 1
40 Inlet Spring 1
41 O-Ring 2
42 Hex Screw 1
43 Air Inlet 1
44 Air Inlet Screen 1
45 Hose Connector 1
46 Hex Screw 4
47 Pin 1
48 Pin 1
49 Trigger 1
PARTS LIST
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. NEITHER THE MANUFACTURER OR
DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT
HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR 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 RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE
ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER
INSTALLATION OF REPLACEMENT PARTS THERETO.
Record Product’s Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only, and are not avail-
able individually as replacement parts.

SKU 68128 For technical questions, please call 1-800-444-3353. Page 13
ASSEMBLY DIAGRAM
LIMITED 1 YEAR WARRANTY
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and dura-
bility standards, and warrants to the original purchaser that this product is free from defects in materials
and workmanship for the period of one year from the date of purchase (90 days if used by a professional
contractor or if used as rental equipment). This warranty does not apply to damage due directly or indi-
rectly, to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, normal wear
and tear, or to lack of maintenance. We shall in no event be liable for death, injuries to persons or prop-
erty, 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 mer-
chandise. 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 replace-
ment. 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.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • [phone]