Harbor Freight Tools Nail Gun 68021 User Manual

2” 18 GAUGE  
BRAD NAILER  
Model 68021  
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 2010 by Harbor Freight Tools . All rights reserved. No portion of this manual or any artwork  
contained herein may be reproduced in any shape or form without the express written consent of  
Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing  
improvements, actual product may differ slightly from the product described herein. Tools required for  
assembly and service may not be included.  
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WARNING – When using tools, basic  
precautions 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 using 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 unexpected  
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  
b. Do not operate the tool in explosive  
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.  
conditions. Wear heavy-duty work  
gloves during use.  
f.  
Always wear eye protection.  
Wear ANSI-approved 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 exposure to  
high intensity noise is able to  
cause hearing loss.  
Personal safety  
a. Stay alert. Watch what you are  
doing and use common sense when  
operating the tool. Do not use the  
tool while tired or under the influence  
of drugs, alcohol, or medication. 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 contains  
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 fasteners.  
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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 manufacturer 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.  
Service  
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.  
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 adjustments,  
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.  
Air source  
a.  
Never connect to an air  
source that is capable of  
e. Store the tool when it is idle out of  
reach of children and other untrained  
persons. A tool is dangerous in the  
hands of untrained users.  
exceeding 200 PSI. Over  
pressurizing the tool may  
cause bursting, abnormal operation,  
breakage of the tool or serious injury to  
persons. Use only clean, dry, regulated  
compressed air at the rated pressure or  
within the rated pressure range as  
marked on the tool. Always verify prior to  
using the tool that the air source has  
been adjusted to the rated air pressure  
or within the rated air-pressure range.  
f.  
Maintain the tool with care. A properly  
maintained tool reduces the risk of  
binding and is easier to control.  
g. Check for misalignment or binding  
of moving parts, breakage of parts,  
and any other condition that affects  
the tool’s operation. If damaged,  
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.  
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c. Clearing a jam.  
SAVE THESE  
INSTRUCTIONS.  
d. Moving the tool to a new location.  
13. Do not make any modifications to tool.  
Specific Safety Instructions  
14. Refer to the tool maintenance  
instructions for detailed information on  
the proper maintenance of the tool.  
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.  
15. 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.  
2. Keep fingers away from trigger  
when not driving fasteners to avoid  
accidental firing.  
16. Do not fire fasteners too close to edge of  
a workpiece. They may split workpiece  
and fly free, causing personal injury.  
3. Choice of triggering method is  
important. Check manual for  
triggering options.  
17. Keep clear of the workpiece near area  
being fastened. Fasteners may bend  
sideways during firing, causing them  
to exit the workpiece at an unexpected  
point, causing personal injury.  
4. Always assume tool contains fasteners.  
5. Do not point toward yourself or anyone  
whether it contains fasteners or not.  
6. Do not actuate the tool unless the tool is  
18. Transport Tool safely. Always disconnect  
air supply when moving the tool. Carry  
the tool by the handle and avoid contact  
with the trigger.  
placed firmly against the workpiece.  
7. Respect the tool as a working implement.  
8. No horseplay. This tool is not a toy and  
can be deadly if misused.  
19. Hold tool away from head and body.  
During operation the Tool may kick back  
causing injury.  
9. Do not load tool with fasteners when any  
one of operating controls, such as the  
20. Do not fire fasteners into a workpiece  
that has people, utility lines, or other  
objects behind or inside it.  
Trigger or Safety Nosepiece, is activated.  
10. Do not remove, tamper with, or otherwise  
cause the tool operating controls to  
become inoperable.  
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.  
11. Do not operate if any portion of operating  
controls is inoperable, disconnected,  
altered, or not working properly.  
12. Disconnect tool from air supply when:  
a. Unattended.  
22. Obey the manual for the air compressor  
used to power this tool.  
b. Performing any maintenance or repair.  
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23. Install in-line shutoff valve to allow  
immediate control over air supply in an  
emergency, even if a hose is ruptured.  
particularly to the hands, arms and shoulders.  
To reduce the risk of vibration-related injury:  
1. Anyone using vibrating tools regularly  
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, nervous system disorders,  
diabetes, or Raynaud’s Disease  
24. Do not engrave or stamp anything into  
the housing to avoid weakening it.  
25. WARNING: Some dust created by  
power sanding, sawing, grinding,  
drilling, 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:  
• Lead from lead-based paints  
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  
possible.  
• Crystalline silica from bricks and  
cement or other masonry products  
• Arsenic and chromium from chemically  
treated lumber  
Your risk from these exposures varies,  
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.)  
WARNING: The brass components of  
this product contain lead, a chemical  
known to the State of California to cause  
birth defects (or other reproductive  
harm). (California Health & Safety code  
§ 25249.5, et seq.)  
2. Do not smoke during use. Nicotine  
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.  
4. Use tools with the lowest vibration when  
there is a choice between different  
processes.  
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.  
26. The warnings and precautions discussed  
in this manual cannot cover all possible  
conditions and situations that may occur.  
It must be understood by operator that  
common sense and caution are factors  
which cannot be built into this product,  
but must be supplied by operator.  
7. To reduce vibration, maintain tool as  
explained in this manual. If abnormal  
vibration occurs, stop immediately.  
SAVE THESE  
INSTRUCTIONS.  
Vibration Precautions  
This tool vibrates during use. Repeated  
or long-term exposure to vibration may cause  
temporary or permanent physical injury,  
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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.  
Functional Description  
Specifications  
Operating Air  
70-120 PSI  
Pressure  
Unpacking  
Max. Air Pressure  
Air Consumption  
Air Inlet  
120 PSI  
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.  
.5 CFM @ 90 PSI  
1/4” -18 NPT  
Fastener Capacity 3/8” to 2” 18 Gauge Brad Nails  
Magazine Capacity 100 Fasteners  
Safety  
Full Sequential Trip Safety  
This air tool may be shipped with a  
protective plug covering the air inlet.  
Remove this plug before set up.  
Components and Controls  
Air Deflector  
(3)  
Air Supply  
Air Inlet  
Plug (63)  
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.  
Trigger  
(36)  
Latch  
(58)  
1. Connect a regulator valve, an in-line shut  
off valve and 1/4” NPT air hose (all sold  
separately) to the Quick Coupler. Use  
thread tape for all threaded connections.  
The air hose must be long enough to  
reach the work area with enough extra  
length to allow free movement while  
working. 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  
Safety (26)  
Safety Nosepiece - Also called the workpiece  
contact, the Safety Nosepiece helps  
prevent the tool from firing unless it is  
pressed against an object.  
valve should be a ball valve because  
it can be closed quickly. See pages 8  
and 9 for Air Tool Setup procedures.  
INITIAL TOOL SET UP/  
ASSEMBLY  
Read the ENTIRE IMPORTANT  
SAFETY INFORMATION  
section at the beginning of this  
manual including all text under  
subheadings therein before set up  
or use of this product.  
Note: If an automatic oiler system is not  
used, add a few drops of Pneumatic  
Tool Oil into the airline connection before  
operation. Add a few more drops after  
each hour of continual use.  
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Air Tool & Spray Gun Portable Setup  
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Air Tool & Spray Gun Stationary Setup  
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2. Attach an air hose to the compressor’s  
air outlet. Connect the air hose to the air  
inlet of the tool. Other components, such  
as a coupler plug and quick coupler, will  
make operation more efficient, but are  
not required.  
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 supply, safely  
discharge any residual air pressure, and  
release the trigger to prevent accidental  
operation.  
WARNING! TO PREVENT SERIOUS  
INJURY FROM ACCIDENTAL  
OPERATION:  
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.  
Do not install a quick coupler on the  
tool. 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  
performance, can be hindered by  
undersized 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 Trigger.  
5. Close the in-line safety valve between  
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.  
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.  
8. The air pressure setting must not exceed  
job site regulations/restrictions. The air  
pressure setting must not exceed 120  
PSI when being used with work pieces  
that have a thickness of less than 1-3/4”.  
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Safety Nosepiece are released first, and then  
both are depressed again. The Tool should  
not fire if the Safety Nosepiece is not pressed  
against an object.  
OperatingInstructions
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.  
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.  
Inspect tool before use, looking  
for damaged, loose, and missing  
parts. If any problems 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  
distraction and injury.  
1. Disconnect tool from the air supply.  
2. Empty the Moveable Magazine of  
fasteners.  
3. Check that the Trigger and the Safety  
move freely, without sticking.  
2. Route the air hose along a safe route to  
reach the work area without creating 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.  
4. Connect the air supply to the tool and  
set within the Operating Air Pressure  
indicated on the Specification chart.  
5. Test the tool by pressing the Safety  
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  
technician.  
3. Secure loose workpieces using a vise  
or clamps (not included) to prevent  
movement while working.  
4. There must not be hazardous objects  
(such as utility lines or foreign objects)  
nearby that will present a hazard while  
working.  
6. Hold the tool away or off of the  
workpiece. The Safety should return  
to its original position. Squeeze the  
Trigger. The tool must not cycle (fire).  
If the tool fires, stop immediately and  
have it repaired by a qualified service  
technician.  
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  
7. Press the Safety 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  
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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.  
General Operating Instructions  
1. Test the Tool, as directed in the prior  
section, before each use.  
2. If automatic oiler is not used, add a few  
drops of Pneumatic Tool Oil to air intake  
of tool before use. Add a few drops  
Loading the Tool  
more after each hour of continual use.  
TO PREVENT  
SERIOUS INJURY  
FROM ACCIDENTAL OPERATION,  
BEFORE LOADING:  
3. Attach the Nailer to the air supply at the  
Air Inlet Plug. Start your compressor  
and check the pressure, making sure it is  
set at the recommended 70-120 PSI.  
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.  
4. To re, place the nose of the Naile  
on the workpiece. The Nailer should  
not fire if the Safety is not depressed.  
Once depressed, gently and briefly  
squeeze the Trigger once. Do not fire  
repeatedly; nails could bounce off of  
one another, damaging the work piece or  
causing PERSONAL INJURY.  
Release the Trigger.  
Detach the air supply.  
• Attempt to fire the Tool into a  
piece of scrap wood to ensure  
that it is incapable of firing any  
fasteners.  
5. If the tool requires more force to  
accomplish the task, verify that the  
tool receives sufficient, unobstructed  
airflow (CFM) and pressure (PSI).  
1. Depress the Latch (58) and pull back the  
Sliding Magazine (52) completely.  
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,  
a larger tool would then be required.  
2.  
Load the pointed end of the nail strip into  
the bottom of the Fixed Magazine (50),  
laying the the strip flat on the bed of  
Magazine.  
3.  
4.  
Slide strip forward into Drive Guide (40).  
Gently push the Sliding Magazine inward  
and push forward until the Latch snaps  
and locks securely. WARNING! Do not  
pinch your hand.  
6. After use, to prevent accidents:  
a. Release the Trigger.  
b. Detach the air supply.  
5.  
NOTE: The small window at the front  
of the Sliding Magazine indicates the  
amount of remaining fasteners, with  
the zero (“0”) marker indicating 15  
pieces and 5-piece marker increments  
thereafter.  
c. Attempt to fire Tool into scrap wood  
to ensure it is incapable of firing.  
d. Release the Trigger again.  
e. Clean external surfaces with clean,  
dry cloth.  
f. Store indoors out of children’s reach.  
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mechanism and may be highly  
flammable, causing an explosion.  
User‑Maintenance Instructions  
Note: These procedures are in addition to  
the regular checks and maintenance  
explained as part of the regular operation  
of the air-operated tool.  
Procedures not specifically  
explained in this manual must  
be performed only by a qualified  
technician.  
Daily ‑ Air Supply Maintenance:  
TO PREVENT  
SERIOUS INJURY  
FROM ACCIDENTAL OPERATION,  
BEFORE ANY MAINTENANCE OR  
REPAIRS ARE DONE (including  
clearing jams):  
Every day, perform maintenance on the  
air supply according to the component  
manufacturers’ instructions. If equipped  
with, the lubricator’s oil level needs to be  
maintained and the moisture filter must  
be regularly drained. Performing routine  
maintenance on the air supply will allow  
the tool to operate more safely and will  
also reduce wear on the tool.  
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.  
Clearing Jams  
Release the Trigger.  
Detach the air supply.  
TO PREVENT  
SERIOUS INJURY  
FROM ACCIDENTAL OPERATION,  
BEFORE ANY MAINTENANCE OR  
REPAIRS ARE DONE (including  
clearing jams):  
• Attempt to fire the Tool into a  
piece of scrap wood to ensure  
that it 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 fastener to  
fly out of the Tool.  
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.  
TO PREVENT SERIOUS INJURY  
FROM TOOL FAILURE: Do not  
use damaged equipment. If  
abnormal noise, vibration, or  
leaking air is detected, have  
problem corrected before further  
use.  
Release the Trigger.  
Detach 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 fastener to  
fly out of the Tool.  
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  
1. If a fastener is jammed in the discharge  
area, remove it with pliers.  
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2. If a fastener is jammed in the Magazines, 13. If you are unable to clear the fastener  
depress the Latch and pull back on the  
Sliding Magazine, pulling it out of Fixed  
Magazine.  
jam using the method prescribed above,  
the tool should be taken to a qualified  
service technician 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  
remaining fastener strip; it may be bent  
or damaged in some other way.  
4. If a fastener is jammed in the Drive  
Guide, pull on the Quick Release Lever  
(44) and disengage the Quick Release  
Spring (45).  
5. Remove the jammed fastener; pliers  
maybe necessary to remove a stuck  
fastener.  
6. Inspect the Drive Guide for any bends or  
breakage. If it is damaged, do not use  
the tool until it is repaired by a qualified  
technician.  
7. Lightly oil the Drive Guide, engage the  
Quick Release Spring, and snap the  
Quick Release Lever back into place.  
8. Make sure that the Safety Tip moves  
smoothly without biding.  
9. Reload the Nailer and then reconnect it  
to the air supply.  
10. Press the Safety of the Nailer against an  
appropriate piece of scrap wood.  
11. Test fire the Nailer several times,  
checking for proper operation.  
12. Disconnect the Nailer, remove the  
fasteners, and store in a location out of  
children’s reach.  
Page 14  
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SKU 68021  
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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 110 PSI 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. Incorrect tool depth setting.  
2. Too much air pressure.  
1. Jammed fastener.  
1. Adjust depth setting, if available.  
2. 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  
120 PSI maximum air pressure.  
Frequent  
jamming.  
1. Incorrect fastener type.  
1. Confirm fastener diameter, type, length, angle, and  
collation type. Correct as needed.  
2. Bent or damaged safety  
components.  
2. Have tool serviced by qualified service technician.  
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 68021  
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Page 15  
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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.  
Parts List  
Part  
Description  
Cap Screw (M5x.80x20mm)  
Spring Gasket  
Air Deflector  
Cylinder Cap  
Sealing Gasket  
Air Deflector Plate  
O-Ring  
O-Ring  
Head Valve Spring  
Qty  
6
6
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
Part  
Description  
Qty  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
3
1
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
2
3
4
5
6
7
8
9
33 O-Ring  
34 Valve Sleeve  
35 Trigger Spring  
36 Trigger  
37 Position Pin  
38 Safety Plate  
39 Pin  
40 Drive Guide  
41 Fixed Cover  
42 Movable Plate  
43 Pin  
44 Quick Release Lever  
45 Quick Release Spring  
46 Pin  
47 Cap Screw (M4x.70x8mm)  
48 Locking Sleeve  
49 Insert Bar  
50 Fixed Magazine  
51 Position Plate  
52 Sliding Magazine  
53 Pin  
10 Head Valve  
11 O-Ring  
12 O-Ring  
13 O-Ring  
14 Cylinder Cap Sealing Ring  
15 Collar  
16 O-Ring  
17 Cylinder  
18 O-Ring  
19 O-Ring  
20 Piston Assembly  
21 Bumper  
22 Housing  
54 Pusher  
23 Sealing Washer  
24 Safety Spring  
25 Push Stem  
26 Safety  
27 Guide Sleeve  
28 Cap Screw (M4x.70x8mm)  
29 Rectangle Sealing Ring  
30 Valve Seat  
31 O-Ring  
55 Pusher Stem  
56 Pusher Spring  
57 Pin  
58 Latch  
59 Latch Spring  
60 Rubber  
61 O-Ring  
62 End Cap  
63 AIr Inlet Plug  
64 Air Inlet Plug Cover  
32 Valve Stem  
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 available  
individually as replacement parts.  
Page 16  
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SKU 68021  
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Assembly Diagram  
SKU 68021  
For technical questions, please call 1‑800‑444‑3353.  
Page 17  
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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 equipment). 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 apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF  
ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF  
MERCHANTABILITY AND FITNESS.  
To take advantage of this warranty, the product or part must be returned to us with  
transportation charges prepaid. Proof of purchase date and an explanation of the complaint  
must accompany the merchandise. If our inspection verifies the defect, we will either repair or  
replace the product at our election or we may elect to refund the purchase price if we cannot  
readily and quickly provide you with a replacement. We will return repaired products at our  
expense, but if we determine there is no defect, or that the defect resulted from causes not  
within the scope of our warranty, then you must bear the cost of returning the product.  
This warranty gives you specific legal rights and you may also have other rights which  
vary from state to state.  
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353  
Page 18  
For technical questions, please call 1‑800‑444‑3353.  
SKU 68021  
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