Harbor Freight Tools Nail Gun 66872 User Manual

16-GAUGE FINISH NAILER  
66872  
SET UP AND OPERATING INSTRUCTIONS  
®
Distributed exclusively by Harbor Freight Tools .  
3491 Mission Oaks Blvd., Camarillo, CA 93011  
Read and understand tool labels and  
manual. Failure to follow warnings could  
result in DEATH or SERIOUS INJURY.  
SAVE THIS MANUAL.  
©
®
Copyright 2009 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.  
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tool. Distractions are able to result in  
the loss of control of the tool.  
g.  
Always wear hearing  
protection when using  
the tool. Prolonged expo-  
sure to high intensity noise  
Personal safety  
is able to cause hearing loss.  
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.  
h. Do not attach the hose or tool to  
your body. Attach the hose to the  
structure to reduce the risk of loss of  
balance if the hose shifts.  
i.  
Always assume that the tool con-  
tains fasteners. Do not point the tool  
toward yourself or anyone whether it  
contains fasteners or not.  
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.  
j.  
WARNING – Do not fire fastener on  
top of another fastener. This is able  
to cause the fastener to be deflected  
and hit someone, or cause the tool to  
react and result in a risk of injury to  
persons.  
k. WARNING – Remove finger from  
the Trigger when not driving fas-  
teners. Never carry the tool with  
finger on trigger, the tool is able to fire  
a fastener.  
c. Avoid unintentional starting. Be  
sure the Trigger (40) is off before  
connecting to the air supply. Do not  
carry the tool with your finger on the  
trigger or connect the tool to the air  
supply with the trigger on.  
Tool use and care  
d. 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.  
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.  
e.  
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.  
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.  
f.  
Always wear eye protec-  
tion. Wear ANSI-ap-  
proved safety goggles.  
c. Do not use the tool if the Trigger  
does not turn the tool on or off.  
Any tool that cannot be controlled  
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with the trigger is dangerous and  
must be repaired.  
Service  
a. Tool service must be performed  
d. Disconnect the tool from the air  
source before making adjust-  
ments, doing tool maintenance,  
clearing jams, touching the safety,  
leaving work area, loading, or un-  
loading the tool. Such precautionary  
measures reduce the risk of injury to  
persons.  
only by qualified 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 specified by the  
manufacturer.  
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.  
Air source  
a.  
Never connect to an air  
source that is capable of  
f.  
Maintain the tool with care. A prop-  
erly maintained tool is more efficient  
and reduces the risk of binding and is  
easier to control.  
exceeding 90 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.  
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.  
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.  
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.  
SAVE THESE  
INSTRUCTIONS.  
i.  
Use only those fasteners listed  
in the Accessories section of this  
manual. Fasteners not identified for  
use with this tool by the tool manu-  
facturer are able to result in a risk  
of injury to persons or tool damage  
when used in this tool.  
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2. Keep fingers away from Trigger  
when not driving fasteners to  
avoid accidental firing.  
SYMBOLS AND  
SPECIFIC SAFETY  
INSTRUCTIONS  
3. Always assume the tool contains  
fasteners.  
Symbol Definitions  
4. Do not point the tool toward yourself  
or anyone whether it contains fasten-  
ers or not.  
Symbol  
Property or statement  
Pounds per square inch of pressure  
PSI  
CFM  
SCFM  
NPT  
5. Do not actuate the tool unless the  
tool is placed firmly against the work-  
piece.  
Cubic Feet per Minute flow  
Cubic Feet per Minute flow at  
standard conditions  
6. Respect tool as a working implement.  
National pipe thread, tapered  
National pipe thread, straight  
7. No horseplay. This tool is not a toy  
and can be deadly if misused.  
NPS  
WARNING marking concerning Risk  
of Eye Injury. Wear ANSI-approved  
eye protection.  
8. Do not load the tool with fasteners  
when any one of the operating con-  
trols is activated.  
Warning marking concerning Risk of  
Puncture Injury. Wear heavy-duty  
work gloves.  
9. Do not remove, tamper with, or other-  
wise cause the tool operating controls  
to become inoperable.  
Read the manual before set-up and/  
or use.  
10. Do not operate the tool if any portion  
of the tool operating controls is inop-  
erable, disconnected, altered, or not  
working properly.  
WARNING marking concerning Risk  
of Hearing Loss. Wear hearing  
protection.  
WARNING marking concerning Risk  
of Respiratory Injury. Wear NIOSH-  
approved dust mask/respirator.  
11. Disconnect the tool from the power  
source when:  
a. Unattended.  
WARNING marking concerning Risk  
of Explosion.  
b. Performing any maintenance or  
repair.  
Specific Safety Instructions  
c. Clearing a jam.  
d. Moving the tool to a new location.  
1. Operators and others in work area  
MUST wear ANSI-approved safety  
goggles with side shields during  
use. The employer is responsible to  
enforce use of eye protection by the  
operator and others in the work area.  
12. The written approval of the tool man-  
ufacturer must be obtained prior to  
making any modifications to the tool.  
13. Refer to the tool maintenance instruc-  
tions for detailed information on the  
proper maintenance of the tool.  
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14. Fire fasteners into an appropriate  
work surface only. Do not attempt to  
fire fasteners into surfaces too hard  
to penetrate. Do not drive fasteners  
on top of other fasteners, or at too  
steep of an angle. Fasteners can  
ricochet causing personal injury.  
birth defects or other reproductive  
harm. Some examples of these  
chemicals are:  
• Lead from lead-based paints  
• Crystalline silica from bricks and  
cement or other masonry products  
• Arsenic and chromium from chemi-  
cally treated lumber  
Your risk from these exposures var-  
ies, 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. (California Health & Safety  
Code § 25249.5, et seq.)  
15. Do not fire fasteners too close to the  
edge of a workpiece. They may split  
the workpiece and fly free, causing  
personal injury.  
16. Transport Tool safely. Always dis-  
connect air supply when moving the  
tool. Carry the tool by the handle and  
avoid contact with the trigger.  
17. Hold tool away from head and body.  
During operation the Tool may kick  
back causing injury.  
24. 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.)  
18. Do not fire fasteners into a workpiece  
that has people, utility lines, or other  
objects behind or inside it.  
19. Keep balance while using this tool.  
Keep area below clear if working in a  
high location, and secure air hose to  
prevent falls from bystanders acci-  
dentally pulling on it.  
25. 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.  
20. Obey the manual for the air compres-  
sor used to power this tool.  
21. Install in-line shutoff valve to allow im-  
mediate control over air supply in an  
emergency, even if hose is ruptured.  
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:  
22. Do not engrave or stamp anything  
into the housing to prevent weaken-  
ing of the housing.  
23. WARNING: Some dust created by  
power sanding, sawing, grinding, drill-  
ing, and other construction activities,  
contains chemicals known [to the  
1. Anyone using vibrating tools regu-  
larly or for an extended period should  
State of California] to cause cancer,  
SKU 66872  
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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.  
FUNCTIONAL DESCRIPTION  
Specifications  
Air Pressure Range  
60-90 PSI  
Maximum Air Pressure 90 PSI  
Average Air  
4-6 SCFM  
Consumption  
Air Inlet  
1/4” -18 NPT  
100 Nails  
Magazine Capacity  
Trigger Type  
Contact Trip Trigger  
3/4” to 2” Long,  
16-Gauge Collated,  
(Finish Nails)  
Fastener Capacity  
2. Do not smoke during use. Nico-  
tine reduces the blood supply to the  
hands and fingers, increasing the risk  
of vibration-related injury.  
Components and Controls  
Air Inlet  
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.  
Trigger  
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.  
Magazine  
Safety  
Safety - Also called the workpiece contact,  
the safety helps prevent the tool from firing  
unless it is pressed against an object.  
7. To reduce vibration, maintain tool as  
explained in this manual. If abnormal  
vibration occurs, stop immediately.  
INITIAL TOOL SET UP/  
ASSEMBLY  
SAVE THESE  
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.  
SKU 66872  
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Note: For additional information regarding  
the parts listed in the following pages,  
refer to the Assembly Diagram near  
the end of this manual.  
and filter for best service, as shown in  
the diagram above. An in-line shut-  
off valve is an important safety  
device because it controls the air  
supply even if the air hose is rup-  
tured.  
Unpacking  
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.  
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.  
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.  
Note: Air flow, 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. Release the tool’s trigger.  
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.  
1. Incorporate an in-line oiler, shut-off  
valve, regulator with pressure gauge,  
SKU 66872  
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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.  
are found, do not use tool until  
repaired.  
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 injury and distraction.  
8. The air pressure setting must not ex-  
ceed job site regulations/restrictions.  
The air pressure setting must not  
exceed 90 PSI when being used with  
work pieces that have a thickness of  
less than 1-3/4”.  
2. Route the air hose along a safe route  
to reach the work area without creat-  
ing a tripping hazard or exposing the  
air hose to possible damage. The air  
hose must be long enough to reach  
the work area with enough extra  
length to allow free movement while  
working.  
9. Inspect the air connections for leaks.  
Repair any leaks found.  
10. 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 trigger to  
prevent accidental operation.  
3. Secure loose workpieces using a vise  
or clamps (not included) to prevent  
movement while working.  
4. There must not be hazardous ob-  
jects (such as utility lines or foreign  
objects) nearby that will present a  
hazard while working.  
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.  
Testing the Full Sequential Safety  
Trip Mechanism  
TO PREVENT  
SERIOUS INJURY  
FROM ACCIDENTAL  
OPERATION:  
OPERATING INSTRUCTIONS  
Empty the tool before this  
procedure. Point the tool at a  
piece of scrap wood when  
testing.  
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.  
The Tool should not fire if the nose  
is not depressed against the workpiece.  
This tool has a full sequential safety trip  
mechanism, which is designed to prevent  
inadvertent firing. The tool will only fire if  
the Safety is resting on the workpiece prior  
to pulling the Trigger.  
Inspect tool before use, looking  
for damaged, loose, and  
missing parts. If any problems  
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1. Disconnect the tool from the air sup-  
ply.  
Loading the Tool  
TO PREVENT  
SERIOUS INJURY  
FROM ACCIDENTAL  
OPERATION, BEFORE  
LOADING:  
2. Empty the Magazine of fasteners.  
3. Check that the Trigger and the Safety  
on the nose of the tool, move freely,  
without sticking.  
Wear ANSI-approved safety  
goggles with side shields.  
Other people in the work area  
must also wear ANSI-approved  
impact safety goggles.  
4. Connect the air supply to the tool at  
the Male Air Coupler (53) and set at  
the recommended 60-90 PSI, and not  
over the maximum 90 PSI.  
Release the trigger.  
5. Test the tool by depressing the Safety  
against the workpiece without pull-  
ing the Trigger. The Tool must not  
cycle (fire). If it cycles (fires), stop  
immediately and have it repaired by a  
qualified service technician.  
Detach the air supply.  
• Attempt to fire the Tool into  
a piece of scrap wood to  
ensure that it is disconnected  
and is incapable of firing any  
fasteners.  
6. Hold the tool away or off of the work-  
piece. The Safety of the tool should  
return to its original position. Squeeze  
the Trigger. The tool must not cycle  
(fire). If the tool fires, stop immedi-  
ately and have it repaired by a quali-  
fied service technician.  
TO PREVENT  
SERIOUS INJURY  
FROM ACCIDENTAL  
OPERATION:  
Release the trigger, detach the  
air supply, and safely  
discharge any residual air  
pressure in the tool before  
loading. Keep the Tool  
pointed away from yourself  
and others at all times. Do  
not load fasteners with the  
Trigger or Safety depressed.  
7. Depress the Safety against the work-  
piece and squeeze the Trigger. The  
tool must cycle (fire) only once.  
Release the Trigger and squeeze  
it again. The tool must not cycle  
(fire). With the Trigger held, carefully  
lift the tool and press it against the  
workpiece again. The tool must not  
cycle (fire). If it fails to perform in  
the manner explained in bold, have it  
repaired by a qualified service techni-  
cian.  
1. In order to prevent marring the sur-  
face, attach the Nozzle Cover (56).  
The tang on the Cover goes to the  
back of the Nozzle (59). If the Cover  
is attached incorrectly, the Nozzle  
cannot be depressed and the Nailer  
will not function. When not used, at-  
tach the Nozzle Cover onto the tang  
at the back of the Tail Cover (65).  
8. Please note: The Trigger and Safety  
will not work when the Nailer Maga-  
zine is empty.  
2. Depress the Pusher (63) to release  
the Magazine (82).  
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3. Slide the Magazine out all the way.  
6. If the tool requires more force to  
accomplish the task, verify that the  
tool receives sufficient, unobstructed  
airflow (CFM) and increase the  
pressure (PSI) output of the regulator  
up to the maximum air pressure  
rating of this tool.  
4. Insert the required size Fasten-  
ers (3/4”, 1”, 1-1/4”, 1-1/2” or 1-3/4”  
16-gauge) into the Magazine with the  
point towards the Nozzle. WARN-  
ING! Insert ONLY one size of fasten-  
er at a time. Do NOT load fasteners  
of different sizes together.  
CAUTION! TO PREVENT TOOL  
AND ACCESSORY FAILURE,  
RESULTING IN INJURY:  
Do not exceed the tool’s maximum  
air pressure rating.  
5. Slide the Magazine back into place  
until the Pusher (71) locks in.  
6. Air exhaust may be directed in any  
direction. Rotate the Exhaust Valve  
Cover (1) to keep exhaust from blow-  
ing back at the operator’s face.  
If the tool still does not have sufficient  
force at maximum pressure and  
sufficient airflow, then a larger tool  
may be required.  
7. To prevent accidents, turn off the  
tool, detach the air supply, safely  
discharge any residual air pressure  
in the tool, and release the trigger  
after use. Clean external surfaces of  
the tool with clean, dry cloth. Then  
store the tool indoors out of children’s  
reach.  
General Operating Instructions  
1. Test the Tool, as directed in the prior  
section, before each use.  
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.  
USER-MAINTENANCE  
INSTRUCTIONS  
3. Place the Nozzle on a scrap material,  
preferably the same thickness and  
type of material as the workpiece.  
Press the Trigger (40) to activate the  
Nailer. Performing this test-firing will  
help you to set the correct air pres-  
sure (not exceeding 90 PSI) to prop-  
erly drive the fastener.  
Procedures not specifically  
explained in this manual  
must be performed only by a  
qualified technician.  
TO PREVENT  
SERIOUS INJURY  
4. Grip the Body (29) of the Nailer with  
both hands and press the Nozzle  
(59) against the surface you wish to  
fasten. Be sure to keep hands, fin-  
gers and other body parts away from  
Nozzle.  
FROM ACCIDENTAL  
OPERATION, BEFORE ANY  
MAINTENANCE OR REPAIRS  
ARE DONE (including clearing  
jams):  
5. Press the Trigger (40) to activate the  
Nailer.  
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Wear ANSI-approved safety  
goggles with side shields.  
Other people in the work area  
must also wear ANSI-approved  
impact safety goggles.  
explained as part of the regular op-  
eration of the air-operated tool.  
1. Daily - Air Supply Maintenance:  
Every day, perform maintenance on  
the air supply according to the com-  
ponent manufacturers’ instructions.  
The lubricator’s oil level needs to be  
maintained and the moisture filter  
must be regularly drained. Perform-  
ing routine maintenance on the air  
supply will allow the tool to operate  
more safely and will also reduce wear  
on the tool.  
Release the trigger.  
Detach the air supply.  
• Attempt to fire the Tool into  
a piece of scrap wood to  
ensure that it is disconnected  
and is incapable of firing any  
fasteners.  
The Magazine is spring-  
loaded and may cause parts  
or a fastener to fly out of the  
Tool. Empty the magazine  
and leave it open during  
service.  
Clearing Jams  
TO PREVENT  
SERIOUS INJURY  
FROM ACCIDENTAL  
OPERATION, BEFORE ANY  
MAINTENANCE OR REPAIRS  
ARE DONE (including clearing  
jams):  
TO PREVENT SERIOUS  
INJURY FROM TOOL  
FAILURE:  
Do not use damaged  
equipment. If abnormal noise,  
vibration, or leaking air leaks  
occur, have the problem  
corrected before further use.  
Wear ANSI-approved safety  
goggles with side shields.  
Other people in the work area  
must also wear ANSI-approved  
impact safety goggles.  
TO PREVENT EXPLOSION:  
Lubricate only with specified  
lubricants. Lubricate the air  
inlet using only pneumatic  
tool oil. Lubricate the internal  
mechanism using only white  
lithium grease. Other  
Release the trigger.  
Detach the air supply.  
• Attempt to fire Tool into piece  
of scrap wood to ensure  
that it is disconnected and  
incapable of firing fasteners.  
lubricants may damage the  
mechanism and may be highly  
flammable, causing an  
Empty the magazine and leave  
it open during service. The  
Magazine is spring-loaded  
and may cause parts or a  
explosion.  
fastener to fly out of the Tool.  
Cleaning, Maintenance, and  
Lubrication  
1. If a fastener is jammed in the dis-  
charge area, remove it with pliers.  
Note: These procedures are in addition to  
2. If a fastener is jammed in the maga-  
the regular checks and maintenance  
zine, pull the Pusher all the way  
SKU 66872  
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out. Use a screwdriver to release  
the jammed fastener by probing the  
openings in the magazine.  
remaining fastener strip; it may be  
bent or damaged in some other way.  
4. If unable to clear jam using the meth-  
od prescribed above, the tool should  
be taken to a qualified service techni-  
cian for proper servicing.  
3. Pull out the jammed fastener and the  
remainder of the fastener strip that is  
still in the magazine. Dispose of the  
Troubleshooting  
Problem  
Insufficient  
fastener depth.  
Possible Causes  
1. Incorrect tool depth setting.  
2. Not enough air pressure.  
Likely Solutions  
1. Adjust depth setting, if available.  
2. Check for loose connections and make  
sure that air supply is providing enough air  
pressure (PSI) to the tool’s air inlet. Do not  
exceed maximum air pressure.  
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. Mechanism contaminated.  
5. Have qualified technician clean and lubricate  
mechanism. Install in-line filter in air supply  
as stated in Initial Set Up: Air Supply.  
Fasteners drive  
too deeply.  
1. Incorrect tool depth setting.  
2. Too much air pressure.  
1. Tool empty.  
1. Adjust depth setting, if available.  
2. Reduce air supply pressure (PSI).  
1. Fill with correct fasteners.  
Tool cycles  
without firing  
fastener.  
2. Incorrect fasteners used.  
2. Empty, then fill with correct fasteners.  
3. Clean and lubricate magazine and pusher.  
3. Magazine dirty or not  
lubricated properly.  
4. Insufficient air flow.  
4. Check for loose connections and make  
sure that air supply is providing enough air  
flow (CFM) and pressure (PSI) to the tool’s  
air inlet. Do not exceed maximum air  
pressure.  
5. Nails jammed.  
5. Check the Magazine, remove Nozzle, and  
clear bent or broken nails.  
Frequent  
Incorrect fastener type.  
Confirm fastener diameter, type, length, angle,  
jamming.  
and collation type. Correct as needed.  
Severe air  
leakage.  
(Slight air leakage  
is normal,  
especially on  
older tools.)  
1. Cross-threaded housing  
components.  
1. Check for incorrect alignment and uneven  
gaps. If cross-threaded, disassemble and  
replace damaged parts before use.  
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 66872  
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PARTS LIST  
Part  
Description  
Q’ty  
1
2
1
4
1
6
1
1
1
1
1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
Part  
Description  
Q’ty  
1
1
1
1
3
2
1
1
1
1
1
1
3
1
1
1
2
1
1
1
1
1
1
1
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
3
4
5
6
7
8
9
Exhaust Valve Collar  
42 Guide  
O-Ring (33 x 1.75)  
Cover Grip  
Screw (5 x 35)  
Cylinder Cap  
Air Seal  
O-Ring (22 x 1.5)  
Exhaust Valve  
Spring  
43 Trigger Release Catch  
44 Compression Spring  
45 Catch Guide Plate  
46 Screw (5 x 22)  
47 Washer (5 x 1.1)  
48 Spacer  
49 Spring Pin (3 x 24)  
50 Trigger Pin  
51 O-Ring (37.5 x 3.5)  
52 Tail Cover  
53 Male Air Coupler  
54 Screw (4 x 8)  
55 Driver Guide Cover  
56 Nozzle Cover  
57 Safety  
58 Screw (4 x 18)  
59 Nozzle  
60 Nylon Nut (M5)  
61 Magazine Support  
62 Belt Hook  
63 Pusher  
64 Compression Spring  
65 Tail Cover  
66 Step Pin  
67 Spacer  
68 Screw (4 x 25)  
69 Scaleboard  
70 Screw (3 x 12)  
71 Pusher  
72 Spring Holder  
73 Feeder Spring  
74 Steel Bar  
75 Handle Grip  
76 Exhaust Valve Assembly  
77 Head Valve Piston  
78 Piston Set  
10 O-Ring (9.8 x 2.4)  
11 O-Ring (32 x 2.5)  
12 Firing Valve Piston  
13 O-Ring (13 x 3)  
14 O-Ring (24.5 x 3)  
15 O-Ring (22.9 x 2.7)  
16 Piston Head  
17 Piston Driver Coupling  
18 Spring Pin (4 x 10)  
19 Spring Pin (2.5 x 10)  
20 Driver Blade  
21 Collar  
22 O-Ring (44.8 x 2.6)  
23 Spacer  
24 O-Ring (26.6 x 2.6)  
25 Cylinder  
26 Bumper  
27 Gasket  
28 E-Ring (Ø2.5)  
29 Body  
30 Nozzle  
31 O-Ring (11 x 1.05)  
32 Upper Housing  
33 O-Ring (8 x 1)  
34 Conical Spring  
35 O-Ring (1.9 x 1.2)  
36 Remote Core  
37 Remote Housing  
38 O-Ring (9.8 x 1.9)  
39 Spring  
79 Cylinder  
80 Trigger Valve  
81 Rack  
40 Trigger  
41 Trigger Frame  
82 Magazine  
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 66872  
For technical questions, please call 1-800-444-3353.  
Page 14  
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SKU 66872  
For technical questions, please call 1-800-444-3353.  
Page 15  
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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 ac-  
tivity, 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 com-  
plaint must accompany the merchandise. If our inspection verifies the defect, we will ei-  
ther 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 re-  
paired 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  
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 66872  
For technical questions, please call 1-800-444-3353.  
Page 16  
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