Harbor Freight Tools Nail Gun 66902 User Manual

2-in-1 finish nailer/stapler  
Model 66902  
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 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 improve-  
ments, 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.  
Revised Manual 09l  
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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 (42) 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 tools 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,  
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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  
75-90 PSI  
Range  
Maximum Air  
90 PSI  
Pressure  
Air Inlet  
1/4” -18 NPT  
6-8 SCFM  
Average Air  
Consumption  
100 Nails/Staples:  
Fastener  
Capacity  
T-Head 16-Gauge Brad Nails, 3/4” -  
2” L; 1/4” 18-Gauge Crown Narrow  
Gauge Staples, 1/2” - 1-1/2” L  
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.  
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.  
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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.  
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 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  
components, such as a connector,  
air hose 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 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,  
and filter for best service, as shown in  
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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  
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.  
full sequential safety trip  
Mechanism Definition  
This tool has a full sequential safety  
trip mechanism, which is designed to  
prevent inadvertent firing. The tool should  
only fire if the Safety Nosepiece is pressed  
against the workpiece prior to pulling the  
Trigger. It should only fire again if both  
Trigger and Safety Nosepiece are re-  
leased first. The Tool should not fire if the  
Safety Nosepiece is not pressed against  
the workpiece.  
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  
Rev 09d  
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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 technician.  
full sequential safety trip  
Mechanism testing procedure  
tO preVent  
seriOus injurY  
frOM accidental  
OperatiOn:  
empty the tool before this  
procedure. point the tool at a  
piece of scrap wood when  
testing.  
loading the tool  
tO preVent  
seriOus injurY  
frOM accidental  
OperatiOn, BefOre  
lOading:  
1. Disconnect the tool from the air sup-  
ply.  
Wear ansi-approved safety  
goggles with side shields.  
Other people in the work area  
must also wear ANSI-approved  
impact safety goggles.  
2. Empty the Magazine of fasteners.  
3. Check that the Trigger and the Safety  
Nosepiece move freely, without stick-  
ing.  
release the trigger.  
4. Connect the air supply to the tool and  
set within the Operating Air Pressure  
indicated on the Specification chart.  
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.  
5. Test the tool by pressing the Safety  
Nosepiece against the workpiece  
without pulling the Trigger. the tool  
must not cycle (fire). If it cycles  
(fires), stop immediately and have it  
repaired by a qualified service techni-  
cian.  
tO preVent  
seriOus injurY  
frOM accidental  
OperatiOn:  
6. Hold the tool away or off of the work-  
piece. The Safety Nosepiece 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.  
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. Press the Safety Nosepiece against  
the workpiece 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  
1. Depress the Click Lever (74) to  
release the spring-loaded Magazine  
(67) from the Magazine Cover (61).  
2. Slide the Magazine out.  
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3. Insert the required size Fasteners  
(3/4” - 2” L 16-gauge Brad Nails or  
1/2” - 1-1/2” L18-gauge Crown Nar-  
row Staples) into the Magazine.  
use the supplied Plastic Cap (86) on  
the Safety.  
8. 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. Slide the Magazine back into place  
until it clicks.  
general Operating instructions  
1. Before each use, test the Tool, as  
directed in the prior section.  
cautiOn! tO preVent tOOl  
and accessOrY failure,  
resulting in injurY:  
do not exceed the tools maximum  
air pressure rating.  
If the tool still does not have sufficient  
force at maximum pressure and  
sufficient airflow, then a larger tool  
may be required.  
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.  
3. Grip the Body (24) of the Nailer with  
both hands and press the nose piece  
against the surface you wish to fas-  
ten. Be sure to keep hands, fingers  
and other body parts away from  
Nozzle.  
9. 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, and apply  
a thin coat of tool oil. Then store the  
tool indoors out of children’s reach.  
4. Push the nose piece on a scrap  
material, preferably the same thick-  
ness and type of material as the  
workpiece. Press the Trigger (42) to  
activate the Nailer. Performing this  
test-firing will help you to set the cor-  
rect air pressure (not exceeding 90  
PSI) to properly drive the fastener.  
user-Maintenance  
instructiOns  
Procedures not specifically  
explained in this manual  
must be performed only by a  
qualified technician.  
5. Grip the Body (24) of the Nailer with  
both hands and press the Nozzle  
against the surface you wish to fas-  
ten. Be sure to keep hands, fingers  
and other body parts away from the  
Nozzle.  
tO preVent  
seriOus injurY  
frOM accidental  
OperatiOn, BefOre anY  
Maintenance Or repairs  
are dOne (including clearing  
jams):  
6. Press the Trigger (42) to activate the  
Nailer.  
7. To avoid indenting or marring when  
working on the face of fine surfaces,  
Rev 09d, 09l  
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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.  
empty the magazine and leave  
it open during service. the  
Magazine is spring-loaded  
and may cause parts or a  
clearing jams  
tO preVent  
seriOus injurY  
fastener to fly out of the Tool.  
tO preVent seriOus  
injurY frOM tOOl  
failure:  
frOM accidental  
OperatiOn, BefOre anY  
Maintenance Or repairs  
are dOne (including clearing  
jams):  
do not use damaged  
equipment. if abnormal  
noise, vibration, or leaking  
air occurs, 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  
lubricants may damage the  
mechanism and may be highly  
flammable, causing an  
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.  
empty the magazine and leave  
it open during service. the  
Magazine is spring-loaded  
and may cause parts or a  
explosion.  
cleaning, Maintenance, and  
lubrication  
fastener to fly out of the Tool.  
1. If a fastener is jammed in the dis-  
charge area, remove it with pliers.  
note: These procedures are in addition to  
the regular checks and maintenance  
2. If a fastener is jammed in the maga-  
zine, pull the Pusher all the way  
SKU 66902  
for technical questions, please call 1-800-444-3353.  
Page 12  
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back to the engaged position. 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 repaired by a qualified service  
technician.  
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 fastener.  
Tool cycles  
without firing  
fastener.  
2. Incorrect fastener used.  
2. Empty, then fill with correct fastener.  
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.  
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 66902  
for technical questions, please call 1-800-444-3353.  
Page 13  
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parts list  
part  
description  
Q’ty  
1
1
1
4
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
part  
description  
Q’ty  
2
2
1
3
1
1
1
1
1
1
2
1
1
1
1
1
1
1
2
1
2
1
2
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
3
1
1
1
1
1
2
3
4
5
6
7
8
Shoulder Screw  
46 Spring Washer  
Exhaust Deflector  
O-Ring  
Spring Washer  
Hex Bolt  
Head Cap  
O-Ring  
47 Head Screw  
48 Head Cover  
49 Hex Bolt  
50 Safety  
51 Depth Adjusting Knob  
52 Adjusting Guide  
53 E-Ring  
54 Spring  
55 Spacer A  
56 Hex Bolt  
57 Driver Guide Cover  
58 Driver Guide  
59 Hex Bolt  
60 Spacer B  
61 Magazine Cover  
62 Steel Bar  
63 Pusher Unit  
64 Spring Holder  
65 O-Ring  
Gasket  
10 Seal  
11 Spring  
12 Head Valve Piston  
13 O-Ring  
14 O-Ring  
15 O-Ring  
16 Collar  
17 O-Ring  
18 O-Ring  
19 Driver Unit  
20 O-Ring  
21 Cylinder  
22 O-Ring  
23 Bumper  
24 Body  
25 Nozzle  
26 Seal  
27 Upper Trigger Valve  
28 O-Ring  
29 O-Ring  
30 Trigger Valve Piston  
31 O-Ring  
32 O-Ring  
33 Spring  
34 Trigger Plunger  
35 O-Ring  
36 O-Ring  
37 Lower Trigger Valve  
38 Pin  
39 Spring  
40 Trigger Plate  
41 O-Ring  
42 Trigger  
66 Spring  
67 Magazine  
68 Hex Bolt  
69 Nail Positioner  
70 Tail Hanger  
71 Nut  
72 Hex Bolt  
73 Retainer Pin  
74 Click Lever  
75 Spring  
76 O-Ring  
77 Hex Bolt  
78 Cylinder Pin  
79 Tail Cover  
80 Nut  
81 Rubber Grip  
82 Packing  
83 End Cap  
84 Hex Bolt  
85 Air Plug  
86 Plastic Cap  
87 Nut  
88 Hex Bolt  
43 Retainer Pin  
44 Safety Guide  
45 Pin  
record products 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 66902  
for technical questions, please call 1-800-444-3353.  
Page 14  
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asseMBlY diagraM  
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 66902  
for technical questions, please call 1-800-444-3353.  
Page 15  
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liMited 1 Year 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 one year from the  
date of purchase (90 days if used by a professional contractor or if used as rental equip-  
ment). This warranty does not apply to damage due directly or indirectly, 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 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 ap-  
ply 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  
SKU 66902  
for technical questions, please call 1-800-444-3353.  
Page 16  
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