Harbor Freight Tools Nail Gun 66995 User Manual

2” 18-GAUGE BRAD NAILER  
66995  
SET UP AND OPERATING INSTRUCTIONS  
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.  
 
tion. A moment of inattention while  
operating the tool increases the risk  
of injury to persons.  
IMPORTANT SAFETY  
INSTRUCTIONS  
INSTRUCTIONS PERTAINING  
TO A RISK OF FIRE,  
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.  
ELECTRIC SHOCK, OR  
INJURY TO PERSONS  
WARNING – When using tools, basic pre-  
cautions should always be followed,  
including the following:  
c. Avoid unintentional starting. Be  
sure the trigger is released 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 pressed.  
General  
a. To reduce the risks of electric  
shock, fire, and injury to persons,  
read all the instructions before us-  
ing the tool.  
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.  
Work area  
a. Keep the work area clean and well  
lighted. Cluttered benches and dark  
areas increase the risks of electric  
shock, fire, and injury to persons.  
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 operate the tool in explo-  
sive atmospheres, such as in the  
presence of flammable liquids,  
gases, or dust. The tool is able to  
create sparks resulting in the ignition  
of the dust or fumes.  
f.  
Always wear eye protec-  
tion. Wear ANSI-ap-  
proved safety goggles with  
side shields.  
c. Keep bystanders, children, and  
visitors away while operating the  
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  
is able to cause hearing loss.  
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-  
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.  
SKU 66995  
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Page 3  
 
i.  
j.  
Always assume that the tool con-  
tains fasteners. Do not point the tool  
toward yourself or anyone whether it  
contains fasteners or not.  
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.  
WARNING – Do not fire fastener on f.  
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.  
Maintain the tool with care. A prop-  
erly maintained tool reduces the risk  
of binding and is easier to control.  
g. Check for misalignment or bind-  
ing of moving parts, breakage of  
parts, and any other condition that  
affects the tool’s operation. If dam-  
aged, have the tool serviced before  
using. Many accidents are caused  
by poorly maintained tools. There is a  
risk of bursting if the tool is damaged.  
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.  
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.  
Tool use and care  
a. Use clamps or another practical  
way to secure and support the  
workpiece to a stable platform.  
Holding the work by hand or against  
the body is unstable and can lead to  
loss of control.  
i.  
Use only those fasteners listed  
in the Specifications chart 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.  
b. Do not force the tool. Use the  
correct tool for the application. The  
correct tool will do the job better and  
safer at the rate for which the tool is  
designed.  
c. Do not use the tool if the trigger  
does not turn the tool on or off.  
Any tool that cannot be controlled  
with the trigger is dangerous and  
must not be used until repaired.  
Service  
a. Tool service must be performed  
only by qualified repair personnel.  
b. When servicing a tool, use only  
identical replacement parts. Use  
only authorized parts.  
d. Disconnect the tool from the air  
source before making adjust-  
ments, doing tool maintenance,  
clearing jams, touching the safety  
nosepiece, leaving work area,  
loading, or unloading the tool.  
Such precautionary measures reduce  
the risk of injury to persons.  
c. Use only the lubricants supplied  
with the tool or specified by the  
manufacturer.  
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Page 4  
 
4. Always assume the tool contains  
fasteners.  
Air source  
a.  
Never connect to an air  
source that is capable of  
exceeding 90 PSI. Over  
5. Do not point the tool toward yourself  
or anyone whether it contains fasten-  
ers or not.  
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.  
6. Do not actuate the tool unless the  
tool is placed firmly against the work-  
piece.  
7. Respect the tool as a working imple-  
ment.  
8. No horseplay. This tool is not a toy  
and can be deadly if misused.  
9. Do not load the tool with fasteners  
when any one of the operating con-  
trols, such as the Trigger or Safety  
Nosepiece, is activated.  
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.  
10. Do not remove, tamper with, or other-  
wise cause the tool operating controls  
to become inoperable.  
SAVE THESE  
INSTRUCTIONS.  
11. Do not operate the tool if any portion  
of the tool operating controls is inop-  
erable, disconnected, altered, or not  
working properly.  
SPECIFIC SAFETY  
INSTRUCTIONS  
12. Disconnect the tool from the air sup-  
ply when:  
a. Unattended.  
1. Operators and others in work area  
MUST wear ANSI-approved safety  
goggles with side shields during  
use. The employer is responsible to  
enforce the use of eye protection by  
the operator and others in the work  
area.  
b. Performing any maintenance or  
repair.  
c. Clearing a jam.  
d. Moving the tool to a new location.  
13. Do not make any modifications to this  
tool.  
2. Keep fingers away from trigger  
when not driving fasteners to  
avoid accidental firing.  
14. Refer to the tool maintenance instruc-  
tions for detailed information on the  
proper maintenance of the tool.  
3. Choice of triggering method is im-  
portant. Check manual for trigger-  
ing options.  
15. Fire fasteners into an appropriate  
work surface only. Do not attempt to  
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Page 5  
 
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.  
25. WARNING: Some dust created by  
power sanding, sawing, grinding, drill-  
ing, and other construction activities,  
contains chemicals known [to the  
State of California] to cause cancer,  
birth defects or other reproductive  
harm. Some examples of these  
chemicals are:  
16. Do not fire fasteners too close to the  
edge of a workpiece. They may split  
the workpiece and fly free, causing  
personal injury.  
• 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.)  
17. Keep clear of the workpiece near the  
area being fastened. Fasteners may  
bend sideways during firing, caus-  
ing them to exit the workpiece at an  
unexpected point, causing personal  
injury.  
18. Transport Tool safely. Always dis-  
connect air supply when moving the  
tool. Carry the tool by the handle and  
avoid contact with the trigger.  
19. Hold tool away from head and body.  
During operation the Tool may kick  
back causing injury.  
26. 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.)  
20. Do not fire fasteners into a workpiece  
that has people, utility lines, or other  
objects behind or inside it.  
21. Keep balance while using this tool.  
Keep area below clear if working in  
an elevated location, and secure air  
hose to prevent falls from bystanders  
accidentally pulling on it.  
27. 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.  
22. Obey the manual for the air compres-  
sor used to power this tool.  
23. Install an in-line shutoff valve to allow  
immediate control over the air supply  
in an emergency, even if a 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,  
24. Do not engrave or stamp anything  
into the housing to prevent weaken-  
ing of the housing.  
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Page 6  
 
arms and shoulders. To reduce the risk of  
vibration-related injury:  
FUNCTIONAL DESCRIPTION  
Specifications  
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.  
Max. Air Pressure  
Air Inlet  
90 PSI  
1/4” -18 NPT  
3/8” - 2” Brad Nails  
100 Fasteners  
18 SCFM @ 90 PSI  
3/8”  
Fasteners  
Capacity  
Air Consumption  
Air Hose  
Safety  
Single Sequential  
Components and Controls  
Air Inlet  
Trigger  
2. Do not smoke during use. Nico-  
tine reduces the blood supply to the  
hands and fingers, increasing the risk  
of vibration-related injury.  
3. Wear suitable gloves to reduce the  
vibration effects on the user.  
Magazine  
Safety  
Safety Nosepiece - Also called the work-  
piece contact, the Safety Nosepiece  
helps prevent the tool from firing un-  
less it is pressed against an object.  
4. Use tools with the lowest vibration  
when there is a choice between dif-  
ferent processes.  
5. Include vibration-free periods each  
day of work.  
The Nailer also comes with two ad-  
justing wrenches (3 and 4 mm) and a  
bottle of lubricating oil.  
6. Grip tool as lightly as possible (while  
still keeping safe control of it). Let  
the tool do the work.  
INITIAL TOOL SET UP/  
ASSEMBLY  
7. To reduce vibration, maintain tool as  
explained in this manual. If abnormal  
vibration occurs, stop immediately.  
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.  
SAVE THESE  
INSTRUCTIONS.  
SKU 66995  
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Page 7  
 
Note: For additional information regarding 1. Incorporate a filter, regulator with  
the parts listed in the following pages,  
refer to the Assembly Diagram near  
the end of this manual.  
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.  
Unpacking  
When unpacking, make sure that the  
item is intact and undamaged. If any parts  
are missing or broken, please call Harbor  
Freight Tools at 1-800-444-3353 as soon  
as possible.  
Note: If an automatic oiler system is not  
used, add a few drops of Pneumatic  
Tool Oil into the airline connection be-  
fore operation. Add a few more drops  
after each hour of continual use.  
This air tool may be shipped with a  
protective plug covering the air inlet.  
Remove this plug before set up.  
Air Supply  
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 coupler plug and  
quick coupler, will make operation  
more efficient, but are not required.  
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.  
Coupler  
Plug  
Coupler  
Plug  
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. Release the Trigger.  
Recommended Air Line Components  
5. Close the in-line safety valve be-  
tween the compressor and the tool.  
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Page 8  
 
6. Turn on the air compressor according  
to the manufacturer’s directions and  
allow it to build up pressure until it  
cycles off.  
Inspect tool before use, looking  
for damaged, loose, and  
missing parts. If any problems  
are found, do not use tool until  
repaired.  
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.  
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.  
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.  
8. The air pressure setting must not ex-  
ceed job site regulations/restrictions  
or exceed max. 90 PSI.  
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.  
Single Sequential Safety Trip  
Mechanism Definition  
This tool has a single sequential safe-  
ty 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 the trig-  
ger is released 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.  
SKU 66995  
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Page 9  
 
fails to act in the manner explained in  
bold, have it repaired by a qualified  
service technician.  
Single Sequential Safety Trip  
Mechanism Testing Procedure  
TO PREVENT  
SERIOUS INJURY  
Loading/Unloading Nailer  
FROM ACCIDENTAL  
OPERATION:  
Empty the tool before this  
procedure. Point the tool at a  
piece of scrap wood when  
testing.  
TO PREVENT  
SERIOUS INJURY  
FROM ACCIDENTAL  
OPERATION, BEFORE  
LOADING:  
Wear ANSI-approved safety  
goggles with side shields.  
Other people in the work area  
must also wear ANSI-approved  
impact safety goggles with side  
shields.  
1. Disconnect tool from the air supply.  
2. Empty the magazine of fasteners.  
3. Check that Trigger and Safety Nose-  
piece move freely, without sticking.  
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 tool by pressing Safety Nose-  
piece against the workpiece without  
pulling Trigger. The tool must not  
cycle (fire). If it cycles (fires), stop  
immediately and take the tool to a  
qualified service technician for repair.  
1. To load nails, hold Nailer with Safety  
(45) pointing downward and push up  
to release Latch (57) on Magazine  
(50).  
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 it cycles (fires), stop imme-  
diately and take the tool to a qualified  
service technician.  
2. Pull back on Magazine slide out Side  
Cover (56).  
3. Insert stick of 3/8” - 2” Brad Nails into  
front part of Magazine.  
4. Please note: Make sure pointed  
ends of fasteners are resting on bot-  
tom ledge when loading.  
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 cy-  
cle (fire) again only once. With the  
Trigger held, carefully lift the tool and  
press it against the workpiece again.  
The tool must not cycle (fire). If it  
5. Slide the Side Cover forward and into  
Magazine until Latch catches.  
6. To unload nails, follow the above  
instructions, making sure to first  
disconnect the air supply before  
unloading nails.  
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Page 10  
 
clockwise into the locked position, de-  
tach the air supply, safely discharge  
any residual air pressure in the tool,  
and release the trigger after use.  
Clean external surfaces with clean,  
dry cloth. Then store the tool indoors  
out of children’s reach.  
General Operating Instructions  
1. Before use, orient the Exhaust Cover  
(1) so that the vent faces away from  
your face during use. The Exhaust  
Cover can be rotated a full 360° until  
desired position is found.  
2. Once air connection has been set  
up and nails loaded, test the Tool, as  
directed in the prior section, before  
each use.  
USER-MAINTENANCE  
INSTRUCTIONS  
Procedures not specifically  
explained in this manual  
must be performed only by a  
qualified technician.  
3. If an automatic oiler is not used, add  
a few drops of Pneumatic Tool Oil  
(available from the include oil bottle)  
to the airline connection before use.  
Add a few drops more after each  
hour of continual use.  
TO PREVENT  
SERIOUS INJURY  
FROM ACCIDENTAL  
OPERATION, BEFORE ANY  
MAINTENANCE OR REPAIRS  
ARE DONE (including clearing  
jams):  
4. Orient the Nailer correctly so that the  
Safety is perpendicular to the work-  
piece before attempting to drive the  
fastener.  
Wear ANSI-approved safety  
goggles with side shields.  
Other people in the work area  
must also wear ANSI-approved  
impact safety goggles with side  
shields.  
5. Press Safety against work surface  
and squeeze the Trigger (35) to fire  
Nailer.  
6. If tool requires more force to  
accomplish task, verify that tool  
receives sufficient, unobstructed  
airflow (CFM) and increase pressure  
(PSI) output of regulator up to  
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.  
maximum air pressure rating of tool.  
7. CAUTION! TO PREVENT TOOL  
AND ACCESSORY FAILURE,  
RESULTING IN INJURY:  
Do not exceed the tool’s 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.  
Empty the magazine and leave  
it open during service. The  
Magazine is spring-loaded  
and may cause parts or a  
fastener to fly out of the Tool.  
8. To prevent accidents, release the  
Trigger, turn the Trigger Lock counter-  
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Page 11  
 
TO PREVENT SERIOUS  
INJURY FROM TOOL  
FAILURE: Do not use  
damaged equipment. If  
abnormal noise, vibration, or  
leaking air is detected, correct  
problem before further use.  
Clearing Jams  
TO PREVENT  
SERIOUS INJURY  
FROM ACCIDENTAL  
OPERATION, BEFORE ANY  
MAINTENANCE OR REPAIRS  
ARE DONE (including clearing  
jams):  
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  
mechanism and may be highly  
flammable, causing an  
Wear ANSI-approved safety  
goggles with side shields.  
Other people in the work area  
must also wear ANSI-approved  
impact safety goggles with side  
shields.  
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.  
explosion.  
Cleaning, Maintenance, and  
Lubrication  
Note: These procedures are in addition to  
the regular checks and maintenance  
explained as part of the regular op-  
eration of the air-operated tool.  
Empty the magazine and leave  
it open during service. The  
Magazine is spring-loaded  
and may cause parts or a  
fastener to fly out of the 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.  
1. If a fastener is jammed in the dis-  
charge area, remove it with pliers.  
2. If a fastener is jammed in the maga-  
zine, pull the Pusher all the way  
back to the engaged position. Use a  
screwdriver to release the jammed  
fastener by probing the openings in  
the magazine.  
3. WARNING! The Pusher’s spring is  
wrapped around, but not attached  
to, a roller. If the spring is extended  
beyond its length, the end will come  
off the roller and the spring will roll up  
with a snap, possibly pinching your  
finger.  
SKU 66995  
For technical questions, please call 1-800-444-3353.  
Page 12  
 
4. Pull out the jammed fastener and the 5. If you are unable to clear the fastener  
remainder of the fastener strip that is  
still in the magazine. Dispose of the  
remaining fastener strip; it may be  
bent or damaged in some other way.  
jam using the method prescribed  
above, the tool should be taken to a  
qualified service technician for proper  
servicing.  
Troubleshooting  
Problem  
Possible Causes  
Likely Solutions  
Insufficient  
fastener depth.  
1. Not enough air pressure.  
1. 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.  
2. Incorrect lubrication or not  
enough lubrication.  
2. Lubricate using air tool oil and grease  
according to directions.  
3. Blocked air inlet screen (if  
equipped).  
3. Clean air inlet screen of buildup.  
4. Mechanism contaminated.  
4. 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. Too much air pressure.  
1. Jammed fastener.  
1. Reduce air supply pressure (PSI).  
Tool cycles  
without firing  
fastener.  
1. Clear jammed fastener according to Clearing  
Jams instructions.  
2. Tool empty.  
2. Fill with correct fasteners.  
3. Incorrect fasteners used.  
3. Empty, then fill with correct fasteners.  
4. Clean and lubricate magazine and pusher.  
4. Magazine dirty or not  
lubricated properly.  
5. Insufficient air flow.  
5. 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  
jamming.  
Incorrect fastener type.  
Confirm fastener diameter, type, length, angle,  
and collation type. Correct as needed.  
Severe air  
leakage.  
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 66995  
For technical questions, please call 1-800-444-3353.  
Page 13  
 
PARTS LIST  
Part  
Description  
Q’ty  
1
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
1
1
1
1
1
1
Part  
Description  
Q’ty  
1
1
2
1
1
1
1
4
1
1
1
2
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
3
4
5
6
7
8
9
Exhaust Cover  
Hex Bolt  
37 Spring Pin  
38 Guide  
Cylinder Cap Unit  
Seal  
39 Spring Pin  
40 Hex Bolt  
41 Stopper  
42 Spring  
43 Safety Cover  
44 Hex Bolt  
45 Safety  
Seal  
O-Ring  
Compression Spring  
Gasket  
O-Ring  
10 Head Valve Piston  
11 O-Ring  
12 O-Ring  
13 O-Ring  
14 Collar  
15 O-Ring  
16 Driver  
17 Fixed Ring  
18 O-Ring  
19 Lining Ring  
20 O-Ring  
21 Cylinder  
22 O-Ring  
23 Bumper  
24 Housing  
25 Nozzle  
46 Spacer  
47 Driver Guide Cover  
48 Hex Bolt  
49 Driver Guide  
50 Magazine  
51 Steel Bar  
52 Pusher Unit  
53 Spring Holder  
54 O-Ring  
55 Pin  
56 Side Cover  
57 Latch  
58 Spring  
59 Tail Cover  
60 Hex Bolt  
61 Hex Bolt  
62 Spring Pin  
63 Nut  
64 Hex Bolt  
65 Hex Bolt  
66 Hex Bolt  
67 Tail Hanger  
68 Lock Nut  
69 Hand Grip  
70 O-Ring  
26 Seal  
27 Trigger Valve Head  
28 Trigger Valve Plunger  
29 O-Ring  
30 O-Ring  
31 Trigger Valve Body  
32 Spring  
33 Trigger Plate  
34 O-Ring  
35 Trigger  
71 End Cap  
72 Air Plug  
36 Pin  
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 66995  
For technical questions, please call 1-800-444-3353.  
Page 14  
 
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 66995  
For technical questions, please call 1-800-444-3353.  
Page 15  
 
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  
SKU 66995  
For technical questions, please call 1-800-444-3353.  
Page 16  
 

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