Harbor Freight Tools Impact Driver 68128 User Manual

1” PINLESS  
AIR IMPACT WRENCH  
68128  
SET uP ANd OPERATINg INSTRuCTIONS  
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.  
 
tool. Distractions are able to result in  
the loss of control of the tool.  
conditions. Wear heavy-duty work  
gloves during use.  
g.  
h.  
Always wear eye protec-  
tion. Wear ANSI-ap-  
proved safety goggles.  
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 influ-  
ence of drugs, alcohol, or medica-  
tion. A moment of inattention while  
operating the tool increases the risk  
of injury to persons.  
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  
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.  
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. Avoid unintentional starting. Be  
sure the switch is off before con-  
necting to the air supply. Do not  
carry the tool with your finger on the  
switch or connect the tool to the air  
supply with the switch on.  
c. do not use the tool if the Trigger  
switch does not turn the tool on or  
off. Any tool that cannot be controlled  
with the Trigger is dangerous and  
must be repaired.  
d. Remove adjusting keys and  
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.  
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 Trigger to its off position before  
leaving the work area.  
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  
SKU 68128  
For technical questions, please call 1-800-444-3353.  
Page 3  
 
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.  
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.  
f.  
Maintain the tool with care. A  
properly maintained tool is easier to  
control.  
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.  
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.  
SAVE THESE  
INSTRuCTIONS.  
h. use only accessories that are  
identified by the manufacturer for  
the specific tool model. Use of an  
accessory not intended for use with  
the specific tool model, increases the  
risk of injury to persons.  
SYMBOLS ANd  
SPECIFIC SAFETY  
INSTRuCTIONS  
Symbol Definitions  
Service  
Symbol  
Property or statement  
a. Tool service must be performed  
No-load speed  
n
only by qualified repair personnel.  
o
Revolutions or reciprocation per  
minute  
b. When servicing a tool, use only  
identical replacement parts. use  
only authorized parts.  
.../min  
PSI  
Pounds per square inch of pressure  
Foot-pounds of torque  
c. use only the lubricants supplied  
with the tool or specified by the  
manufacturer.  
ft-lb  
Blows per minute  
BPM  
CFM  
SCFM  
NPT  
Cubic Feet per Minute flow  
Air source  
Cubic Feet per Minute flow at  
standard conditions  
a.  
Never connect to an air  
source that is capable of  
National pipe thread, tapered  
National pipe thread, straight  
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,  
NPS  
Chart continued in next column.  
SKU 68128  
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Page 4  
 
5. Obey the manual for the air compres-  
sor used to power this tool.  
Symbol Definitions  
Symbol  
Property or statement  
6. Install an in-line shutoff valve to allow  
immediate control over the air supply  
in an emergency, even if a hose is  
ruptured.  
WARNING marking concerning Risk  
of Eye Injury. Wear ANSI-approved  
eye protection.  
WARNING marking concerning Risk  
of Hearing Loss. Wear hearing  
protection.  
7. Use this tool with both hands only.  
Using tools with only one hand can  
result in loss of control.  
WARNING marking concerning Risk  
of Respiratory Injury. Wear NIOSH-  
approved dust mask/respirator.  
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.  
WARNING marking concerning Risk  
of Explosion.  
Specific Safety Instructions  
Vibration Precautions  
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.  
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  
first 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 fingers),  
seek medical advice as soon as pos-  
sible.  
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.  
2. Do not smoke during use. Nico-  
tine reduces the blood supply to the  
hands and fingers, increasing the risk  
of vibration-related injury.  
SKU 68128  
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Page 5  
 
3. Wear suitable gloves to reduce the  
vibration effects on the user.  
SPECIFICATIONS  
Maximum Air Pressure 90 PSI  
4. Use tools with the lowest vibration  
when there is a choice.  
Air Inlet  
1/2” -14 NPT  
1”  
Drive Size  
5. Include vibration-free periods each  
day of work.  
3200 RPM / 557 BPM  
(Blows Per Minute)  
Maximum Speed*  
Average Air  
Consumption  
10 CFM @ 90 PSI  
6. Grip tool with both hands as lightly as  
possible (while still keeping safe con-  
trol of it). Let the tool do the work.  
Recommended Min.  
Air Hose  
1/2” (Not Supplied)  
Torque  
2000 ft.-lb.  
Three  
7. To reduce vibration, maintain tool as  
explained in this manual. If abnormal  
vibration occurs, stop immediately.  
Speed Settings  
* 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)  
SAVE THESE  
INSTRuCTIONS.  
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 6  
 
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 efficient, but are not required.  
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.  
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.  
Male  
Connector  
Male  
Connector  
Tool  
Quick  
Coupler  
Air Hose  
on Reel  
Note: Air flow, and therefore tool perfor-  
mance, can be hindered by under-  
sized air supply components.  
Valve  
Oiler  
Filter  
3. The air hose must be long enough  
to reach the work area with enough  
extra length to allow free movement  
while working.  
Air  
Compressor  
Regulator with  
Pressure gauge  
4. Close the in-line safety valve be-  
tween the compressor and the tool.  
Recommended Air Line Components  
5. Turn on air compressor according to  
manufacturer’s directions and allow it  
to build up pressure until it cycles off.  
1. Incorporate a filter, regulator with  
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.  
6. 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.  
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.  
7. Inspect the air connections for leaks.  
Repair any leaks found.  
8. If the tool will not be used at this time,  
release the Trigger, close the shut-off  
valve, press the Trigger to discharge  
SKU 68128  
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Page 7  
 
trapped line pressure, and detach air  
supply hose from the air supply.  
Work Piece and Work Area Set up  
1. Designate a work area that is clean  
and well-lit. The work area must not  
allow access by children or pets to  
prevent distraction and injury.  
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.  
2. Route air hose along a safe route  
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.  
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.  
3. The air hose must be long enough  
to reach the work area with enough  
extra length to allow free movement  
while working.  
4. There must not be hazardous objects  
(such as utility lines) nearby that will  
present a hazard while working.  
Inspect tool before use, looking  
for damaged, loose, and  
missing parts. If any problems  
are found, do not use tool until  
repaired.  
general Operating Instructions  
1. WARNINg! Use only 1” Drive Impact  
type sockets (not supplied).  
Tool Set up  
2. If an automatic oiler is not used, 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.  
TO PREVENT  
SERIOuS INjuRY:  
do not adjust or tamper with  
any control or component in a  
way not specifically explained  
within manual. Improper  
adjustment can result in tool  
failure or other serious  
hazards.  
3. Push and snap socket (not included)  
onto Anvil (13).  
4. This Impact Wrench can be used in  
either Forward or Reverse direction.  
To operate in Forward, turn the Direc-  
tion Knob (33) under the housing to  
the desired Forward speed.  
1. For added stability, attach Side Han-  
dle (5) to side of Hammer Case (4)  
using Bolts (6) and Washers (7). .  
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 8  
 
5. For Reverse, turn the Direction Knob  
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.  
6. Hold the Side Handle firmly and place  
other hand around Handle (28). Gen-  
tly squeeze the Trigger (49).  
7. Place socket (not included) over  
desired nut, hold handle firmly and  
gently squeeze the Trigger.  
8. If tool requires more force to  
accomplish task in Forward or  
Reverse setting, verify that the tool  
receives sufficient, unobstructed  
airflow (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 sufficient  
force at maximum pressure and  
sufficient airflow, then a larger tool  
may be required.  
9. When the nut is tightened or loos-  
ened, release the Trigger. Use a  
torque wrench to check the torque of  
the tightened nut.  
10. To prevent accidents, turn off tool,  
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 9  
 
1. daily - Air Supply Maintenance:  
Every day, perform maintenance  
on the air supply according to  
uSER-MAINTENANCE  
INSTRuCTIONS  
the component manufacturers’  
instructions. The lubricator’s oil  
level needs to be maintained and  
the moisture filter must be regularly  
drained. Performing routine  
Procedures not specifically  
explained in this manual  
must be performed only by a  
qualified technician.  
TO PREVENT  
SERIOuS INjuRY  
FROM ACCIdENTAL  
maintenance on the air supply will  
allow the tool to operate more safely  
and will also reduce wear on the tool.  
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.  
2. Quarterly (every 3 months) -  
Tool disassembly, Cleaning,  
and Inspection: Have the internal  
mechanism cleaned, inspected, and  
lubricated by a qualified technician.  
3. Store Impact Wrench in clean, dry  
and safe location out of reach of  
children.  
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  
specified 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 flammable, 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.  
SKU 68128  
For technical questions, please call 1-800-444-3353.  
Page 10  
 
Troubleshooting  
Problem  
Possible Causes  
Likely Solutions  
Decreased output. 1. Not enough air pressure and/ 1. Check for loose connections and make sure  
or air flow.  
that air supply is providing enough air flow  
(CFM) at required pressure (PSI) to the tool’s  
air inlet. do not exceed 90 PSI maximum  
air pressure.  
2. Obstructed trigger.  
2. Clean around trigger to ensure free  
movement.  
3. Incorrect lubrication or not  
enough lubrication.  
3. Lubricate using air tool oil and grease  
according to directions.  
4. Blocked air inlet screen (if  
equipped).  
4. Clean air inlet screen of buildup.  
5. Air leaking from loose housing, 5. Make sure housing is properly assembled  
hose or connections.  
and tight. Repair hose/connection air leaks.  
6. Mechanism contaminated.  
6. Have qualified technician clean and lubricate  
mechanism. Install in-line filter in air supply  
as stated in Initial Set Up: Air Supply.  
7. Vane wear or damage.  
1. Incorrect lubrication or not  
enough lubrication.  
7. Replace all vanes.  
1. Lubricate using air tool oil and grease  
according to directions.  
Housing heats  
during use.  
2. Worn parts.  
2. Have qualified technician inspect internal  
mechanism and replace parts as needed.  
1. Check for incorrect alignment and uneven  
gaps. If cross-threaded, disassemble and  
replace damaged parts before use.  
Severe air  
leakage.  
1. Cross-threaded housing  
components.  
2. Loose housing.  
2. Tighten housing assembly. If housing cannot  
tighten properly, internal parts may be  
misaligned.  
3. Damaged valve or housing.  
3. Replace damaged components.  
4. Dirty, worn or damaged valve. 4. Clean or replace valve assembly.  
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 11  
 
PARTS LIST  
Part  
description  
Q’ty  
Part  
description  
Q’ty  
1
1
1
1
2
2
1
1
1
2
3
4
5
6
7
8
9
Hex Screw  
Gasket  
Nut  
4
26  
Pin  
8
4
1
1
4
4
1
1
27 Gasket  
28 Handle  
29 Pin  
30 Hex Screw  
31 O-Ring  
32 Valve Bushing  
33 Direction Knob  
34 O-Ring  
Hammer Case  
Side Handle  
Bolt  
Washer  
Gasket  
Oil Seal  
1
10 Anvil Bushing  
11 Circlip  
12 O-Ring  
1
1
1
35 Lever Pin  
36 Steel Ball  
37 Spring  
1
1
1
13 Anvil  
1
1
1
1
38 Throttle Bushing  
39 Throttle Valve  
40 Inlet Spring  
41 O-Ring  
1
1
1
2
14 Hammer Bushing  
15 Hammer  
16 Cam  
17 Hammer Cage  
18 Gasket  
1
1
42 Hex Screw  
43 Air Inlet  
1
1
19 Housing  
20 Bearing  
21 Rear End Plate  
22 Vane  
1
2
2
6
44 Air Inlet Screen  
45 Hose Connector  
46 Hex Screw  
47 Pin  
1
1
4
1
23 Rotor  
1
48 Pin  
1
24 Pin  
2
49 Trigger  
1
25 Cylinder  
1
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.  
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.  
SKU 68128  
For technical questions, please call 1-800-444-3353.  
Page 12  
 
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 verifies 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 specific 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 • (800) 444-3353  
SKU 68128  
For technical questions, please call 1-800-444-3353.  
Page 13  
 

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