Central Pneumatic 98751 Installation manual

3-IN-1 AIR FRAMING NAILER
98751
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©2008 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.
Revised Manual 11a

SKU 98751 For technical questions, please call 1-800-444-3353. Page 2
SAVE THIS MANUAL
Keep this manual for the safety warn-
ings and precautions, assembly, operat-
ing, inspection, maintenance and cleaning
procedures. Write the product’s serial
number in the back of the manual near the
assembly diagram (or month and year of
purchase if product has no number). Keep
this manual and the receipt in a safe and
dry place for future reference.
Safety Alert Symbol and Signal
Words
In this manual, on the labeling,
and all other information provid-
ed with this product:
This is the safety alert
symbol. It is used to alert
you to potential personal
injury hazards. Obey all
safety messages that
follow this symbol to avoid
possible injury or death.
DANGER indicates
a hazardous
situation which, if not
avoided, will result in death or
serious injury.
WARNING
indicates a
hazardous situation which, if
not avoided, could result in
death or serious injury.
CAUTION, used
with the safety
alert symbol, indicates a
hazardous situation which, if
not avoided, could result in
minor or moderate injury.
NOTICE is used to
address practices
not related to personal injury.
CAUTION, without
the safety alert
symbol, is used to address
practices not related to
personal injury.
IMINSTRUCTIONS
INSTRUCTIONS PERTAINING
TO A RISK OF FIRE,
ELECTRIC SHOCK, OR
INJURY TO PERSONS
WARNING – When using
tools, basic precautions
should always be followed,
including the following:
General
a. To reduce the risks of electric
shock, re, and injury to persons,
read all the instructions before us-
ing the tool.
Work area
a. Keep the work area clean and well
lighted. Cluttered benches and dark
areas increase the risks of electric
shock, re, and injury to persons.
b. Do not operate the tool in explo-
sive atmospheres, such as in the
presence of ammable liquids,
gases, or dust. The tool is able to
create sparks resulting in the ignition
of the dust or fumes.
c. Keep bystanders, children, and
visitors away while operating the
Important Safety Information

SKU 98751 For technical questions, please call 1-800-444-3353. Page 3
tool. Distractions are able to result in
the loss of control of the tool.
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 inu-
ence of drugs, alcohol, or medica-
tion. A moment of inattention while
operating the tool increases the risk
of injury to persons.
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.
c. Avoid unintentional starting. Be
sure the switch is off before con-
necting to the air supply. Do not
carry the tool with your nger on the
switch or connect the tool to the air
supply with the switch on.
d. Remove adjusting keys and
wrenches before turning the tool
on. A wrench or a key that is left at-
tached to a rotating part of the tool
increases the risk of personal injury.
e. Do not overreach. Keep proper
footing and balance at all times.
Proper footing and balance enables
better control of the tool in unexpect-
ed situations.
f. Use safety equipment. A
dust mask, non-skid safety
shoes and a hard hat must
be used for the applicable
conditions. Wear heavy-duty work
gloves during use. Wear a full face
shield if you are producing metal
lings or wood chips.
g. Always wear eye protec-
tion. Wear ANSI-ap-
proved safety goggles with
side shields during use.
h. Always wear hearing
protection when using
the tool. Prolonged expo-
sure to high intensity noise
is able to cause hearing loss.
Tool use and care
a. Avoid unintentional
misres. Be sure Trigger
(59) is in the OFF posi-
tion when not in use and
before plugging in. Do
not carry any tool with your nger on
the Trigger, whether it is attached to
an air source or not. Do not point tool
towards yourself or anyone whether it
contains nails or not.
b. Do not load nails with Trigger or
safety depressed. Unintentional r-
ing may occur. Always assume Nailer
contains fasteners.
c. Do not load fasteners when Nailer
is connected to air hose. Always
assume tool contains fasteners. Unin-
tentional ring may occur.
d. Properly adjust Nailer angle to
match corresponding fasteners
before inserting nail strip. Failure
to do so can cause Nailer to jam and
lead to personal and/or property dam-
age.
e. Fire nails into an appropriate work
surface only. Do not attempt to re

SKU 98751 For technical questions, please call 1-800-444-3353. Page 4
cleat nails or staples into surfaces
too hard to penetrate. Do not drive
cleat nails or staples on top of other
cleat nails or staples, or at too steep
an angle. Cleat nails and staples can
ricochet, causing personal injury.
Never re this tool into the air or point
it toward yourself or another person.
f. Hold tool away from head and
body during use. Tool may kick
back, causing injury.
g. Do not re fasteners too close to
edge of workpiece. They may split
the workpiece and y free, causing
personal injury.
h. Carry tool safely. Carry tool by
handle.
i. 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.
j. Do not force the tool. Use correct
tool for application. The correct tool
will do the job better and safer at the
rate for which the tool is designed.
k. Disconnect the tool from the air
source before making any adjust-
ments, changing accessories, or
storing the tool. Such preventive
safety measures reduce the risk
of starting the tool unintentionally.
Turn off and detach the air supply
and safely discharge any residual
air pressure before leaving the work
area.
l. 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.
m. Maintain the tool with care. Keep
tool clean. A properly maintained tool,
reduces the risk of binding and is
easier to control.
n. 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.
o. Use only accessories that are
identied by the manufacturer for
the specic tool model. Use of an
accessory not intended for use with
the specic tool model, increases the
risk of injury to persons.
Service
a. Tool service must be performed
only by qualied 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 specied by the
manufacturer.
Air source
a. Never connect to an air
source that is capable of
exceeding 120 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 (70 to
120 PSI). Always verify prior to using

SKU 98751 For technical questions, please call 1-800-444-3353. Page 5
the tool that the air source has been
adjusted to the rated air pressure or
within the rated air-pressure range.
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.
SAVE THESE
INSTRUCTIONS.
SYMBOLS AND
SPECIFIC SAFETY
INSTRUCTIONS
Symbol Denitions
Symbol Property or statement
noNo-load speed
.../min Revolutions or reciprocation per
minute
PSI Pounds per square inch of pressure
ft-lb Foot-pounds of torque
BPM Blows per minute
CFM Cubic Feet per Minute ow
SCFM Cubic Feet per Minute ow at
standard conditions
NPT National pipe thread, tapered
NPS National pipe thread, straight
WARNING marking concerning Risk
of Eye Injury. Wear ANSI-approved
eye protection.
Chart continued in next column.
Symbol Denitions
Symbol Property or statement
WARNING marking concerning Risk
of Hearing Loss. Wear hearing
protection.
WARNING marking concerning Risk
of Respiratory Injury. Wear NIOSH-
approved dust mask/respirator.
WARNING marking concerning Risk
of Explosion.
Specic Safety Instructions
1. The warnings and precautions dis-
cussed in this manual cannot cover
all possible conditions and situations
that may occur. It must be under-
stood by the operator that common
sense and caution are factors which
cannot be built into this product, but
must be supplied by the operator.
2. 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:
• 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 lter out microscopic

SKU 98751 For technical questions, please call 1-800-444-3353. Page 6
particles. (California Health & Safety
Code § 25249.5, et seq.)
3. Take caution, as some woods contain
preservatives such as copper chro-
mium arsenate (CCA) which can be
toxic. When nailing these materials,
extra care should be taken to avoid
inhalation and minimize skin contact.
4. 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.)
5. Only use with accessories rated to
handle forces exerted by tool during
operation. Other accessories not de-
signed for the forces generated may
break and forcefully launch pieces.
6. Attach all accessories properly to the
tool before connecting the air sup-
ply. A loose accessory may detach or
break during operation.
7. Obey the manual for the air compres-
sor used to power this tool.
8. Install in-line shutoff valve to allow
immediate control over air supply in
emergency, even if hose is ruptured.
9. Do not lay tool down until it has com-
pletely stopped. Moving parts can
grab surface and lead to control loss.
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:
1. Anyone using vibrating tools regu-
larly or for an extended period should
rst 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 medical or
physical symptoms related to vibra-
tion (such as tingling, numbness, and
white or blue ngers), seek medical
advice as soon as possible.
2. Do not smoke during use. Nico-
tine reduces the blood supply to the
hands and ngers, 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 dif-
ferent 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.
7. To reduce vibration, maintain tool as
explained in this manual. If abnormal
vibration occurs, stop immediately.
SAVE THESE
INSTRUCTIONS.

SKU 98751 For technical questions, please call 1-800-444-3353. Page 7
FUNCTIONAL DESCRIPTION
Specications
Air Pressure Range 70-120 PSI
Maximum Air
Pressure 120 PSI
Air Inlet 1/4” -18 NPT
Nail Type / Length
.113”-.131” Shank
Clipped or Full Head Nails
2” to 3-1/2” Length
Magazine
Capacity
21° - 60 Nails
28°/34° - 100 Nails
Air Consumption 3 CFM @ 90 PSI
Hose 3/8”
Safety Trigger Full Sequential Actuation
INITIAL ASSEMBLY
Read the ENTIRE IMPORTANT
SAFETY INFORMATION
section at the beginning of this
manual including all text under
subheadings therein before set
up or use of this product.
Note: For additional information regarding
the parts listed in the following pages,
refer to the Assembly Diagram near
the end of this manual.
Unpacking
When unpacking, check to make sure
that the item is intact and undamaged. If
any parts are missing or broken, please
call Harbor Freight Tools at the number
shown throughout the manual as soon as
possible.
• This air tool may be shipped with a
protective plug covering the air inlet.
Remove this plug before set up.
Air Supply
TO PREVENT
EXPLOSION:
Use only clean, dry, regulated,
compressed air to power this
tool. Do not use oxygen,
carbon dioxide, combustible
gases, or any other bottled
gas as a power source for this
tool.
1. Connect a regulator valve, an in-line
shut off valve and 1/4” NPT air hose
(all sold separately) to the Quick Con-
nector. Use thread tape on all thread-
ed 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 valve
should be a ball valve because it
can be closed quickly.
See pages 8 and 9 for Air Tool
Setup procedures.
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.
2. Attach an air hose to the compres-
sor’s air outlet. Connect the air hose
to the air inlet of the tool. Other com-
ponents, such as a connector and
quick coupler, will make operation
more efcient, but are not required.
WARNING! TO PREVENT SERIOUS
INJURY FROM ACCIDENTAL
OPERATION:
Do not install a quick coupler on
the tool. Such a coupler contains
Functional Description
Initial Tool Set Up / Assembly
Rev 11a

SKU 98751 For technical questions, please call 1-800-444-3353. Page 8
Description Function
A Air Hose Connects air to tool
B Filter Prevents dirt and condensation from damaging tool or work piece
C Regulator Adjusts air pressure to tool D Lubricator (optional) For air tool lubrication
E Coupler and Plug Provides each connections
F Leader Hose (optional) Increases coupler life
G Air Cleaner / Dryer (optional) Prevents water vapor from damaging work piece
HAir Adjusting Valve (optional) For ne tuning airow at tool
G
A
E
E H
F
B
Non-lubricated Tools Lubricated Tools
A
B
C
C
DA
Air Tool & Spray Gun Portable Setup

SKU 98751 For technical questions, please call 1-800-444-3353. Page 9
Description Function
AVibration Pads For noise and vibration reduction
B Anchor Bolts Secures air compressor in place
CBall Valve Isolates sections of system for maintenance D Isolation Hose For vibration reduction
E Main Air Line - 3/4” minimum recommended Distributes air to branch lines
FBall Valve To drain moisture from system
G Branch Air Line -1/2” minimum recommended Brings air to point of use
H Filter Prevents dirt and condensation from damaging tool or work piece
I Air Cleaner / Dryer (optional) Prevents water vapor from damaging work piece
J Regulator Adjusts air pressure to tool
K Lubricator For air tool lubrication
L Air Hose Connects air to tool
M Coupler and Plug Provides each connections
NAir Adjusting Valve For ne tuning airow at tool
O Leader Hose Increases coupler life
I
M
M N
O
C C
Non-lubricated Tools Lubricated Tools
L
H
H
J
JKL
F
G
E
Slope
F
F
B B
A A
CD
Air Tool & Spray Gun Stationary Setup

SKU 98751 For technical questions, please call 1-800-444-3353. Page 10
an air valve that will allow the air
tool to retain pressure and operate
accidentally after the air supply is
disconnected.
Note: Air ow, 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. Close the in-line safety valve be-
tween the compressor and the tool.
5. Turn on the air compressor according
to the manufacturer’s directions and
allow it to build up pressure until it
cycles off.
6. Adjust the air compressor’s output
regulator so that the air output is
enough to properly power the tool,
but the output will not exceed the
tool’s maximum air pressure at any
time. Adjust the pressure gradually,
while checking the air output gauge
to set the right pressure range.
7. Inspect the air connections for leaks.
Repair any leaks found.
8. If the tool will not be used at this time,
turn off and detach the air supply
and safely discharge any residual air
pressure.
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.
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
are found, do not use tool until
repaired.
Testing the Full Sequential
Safety Trip Mechanism
TO PREVENT
SERIOUS INJURY
FROM ACCIDENTAL
OPERATION: Detach the air
supply, safely discharge any
residual air pressure in the
tool before performing any
inspection, maintenance, or
cleaning procedures.
TO PREVENT SERIOUS
INJURY: Do not adjust or
tamper with any control or
component in a way not
specically explained within
this manual. Improper
adjustment can result in
tool failure or other serious
hazards.
1. WARNING! Even though the Nailer
should be empty during this proce-
dure, ALWAYS point the Nailer at a
piece of scrap wood when testing.
2. Completely empty Magazine (79).
Operation

SKU 98751 For technical questions, please call 1-800-444-3353. Page 11
3.
Safety Nosepiece (42)
Magazine (79)
Trigger (59)
Air Coupler (95)
Figure 1
The Nailer should not re if Safety
Nosepiece (42) is not depressed
against the workpiece.
4. Make sure Trigger (59) and Safety
Nosepiece (42) move freely, with-
out sticking. Do not use nailer if
Trigger or Safety sticks.
5. Connect air supply to the Air Coupler
(95). Set the regulator at the recom-
mended 70 to 120 PSI.
6. Test by depressing Safety Nosepiece
(42) against the workpiece without
pulling the Trigger. The Tool must
not cycle (re). If it cycles (res),
stop immediately and have it repaired
by a qualied service technician.
7. Hold tool away or off of workpiece.
The Safety Nosepiece should return
to its original position. Squeeze
Trigger. The tool should not cycle
(re). If the tool res, stop immedi-
ately and have it repaired by a quali-
ed service technician.
8. Depress Safety Nosepiece against
workpiece and squeeze Trigger. The
tool must cycle (re) only once.
Release the Trigger and squeeze
it again. The tool must not cycle
(re). With the Trigger held, carefully
lift the Nailer and press it against the
workpiece again. The tool must not
cycle (re). If it fails to perform in
the manner explained in bold, have it
repaired by a qualied service techni-
cian.
WARNING! Disconnect the Nailer
from the air compressor whenever
loading or servicing.
WEAR ANSI-APPROVED IMPACT
SAFETY GOGGLES WHEN RE-
LOADING OR DOING ANY OTHER
MAINTENANCE ON NAILER. Other
people in work area must also
wear ANSI-approved safety gog-
gles.
Loading Nails
1.
Tab (75)
Lock (88)
Figure 2
Slide the Tab (75) back and the Lock
(88) will hold it in place. See Figure
2, above.
2. Load a stick of nails (not included)
into the top slot, making sure nail
heads are facing up.
3. Be Careful. When Lock is released,
the Tab will automatically and force-
fully slide forward. Keep your ngers
clear when releasing Lock.
4. Note: The Nailer may not work if
there are only a few nails left in the
tool. If there are only a few nails
remaining, simply load another strip

SKU 98751 For technical questions, please call 1-800-444-3353. Page 12
of nails into the Magazine behind the
few remaining nails and the Nailer will
be ready for further use.
Operating Nailer
Set proper angle of the Nailer for your
application (a three step process):
Failure to properly adjust the nailer
can result in tool failure or damage.
1.
Angle Adjustment Holes
Tab (75)
21o28o34o
Hex
Bolt
Figure 3
Pull back and engage the Tab (75),
exposing three adjustment holes.
Loosen the hex bolt and slide it into
the appropriate hole (21°, 28°, 34°).
Retighten the hex bolt securely,
making sure it ts into the appropri-
ate hole properly. See Figure 3,
above. Gently release the Tab.
2.
Adjuster Knob (85)
Figure 4
Remove the Adjuster Knob (85). See
Figure 4, above.
Figure 5
34o28o21o
Joint Plate (86)
Move Magazine so desired hole on
Joint Plate (86) lines up with the nut
on Magazine. See Figure 5, above.
Replace and tighten the Adjuster
Knob.
3. Inspect Pin’s (34) location. See
Figure 6, below.
If you are driving 21° angle nails, the
Pin should be in the lower hole
(position A). If you are driving 28° or
34° angle nails, the Pin should be in
the upper hole (position B). If the Pin
is in the wrong position, pull the Pin
from its Washer (35), reposition the
Bar Guide (36), and reinsert and
secure the Pin and Washer. Before
using Nailer, be sure Pin is properly
secured.
1. The driving depth of a nail can be
adjusted in two ways. First, by in-
creasing or decreasing air pressure
(never to exceed the maximum of
120 PSI). Secondly, by loosening the
Depth Screw (41) and adjusting the
Bracket A (40). We recommend you
experiment in a scrap piece of mate-
rial to determine how far to adjust the
unit.
2. Attach air supply to Air Coupler. Start
your air compressor and make sure it
is set to between the recommended
70-120 PSI.
Figure 6
Position A
(Pin in 21° Slot)
Position B
(Pin in 28° / 34° Slot)
Pin (34)
21o
21o
28o / 34° 28o / 34° Pin (34)

SKU 98751 For technical questions, please call 1-800-444-3353. Page 13
3. To re, place the Safety Nosepiece
of the Nailer on the workpiece. The
Nailer should not re if the Safety
Nosepiece is not depressed. Once
depressed, quickly squeeze the
Trigger once. Do not re repeat-
edly; nails could bounce off of one
another causing injury. We recom-
mend practicing with a piece of scrap
material.
4. The Rubber Cover (43) provides a
non-marring surface. If desired, the
Rubber Cover may be removed to ex-
pose the teeth on Safety Nosepiece.
Doing so provides a nonslip surface
and can improve accuracy.
5. When nished, disconnect the Nailer
from the air source.
Clearing Jams
WARNING! Anytime any
maintenance or repairs are
done (including clearing
jams), wear ANSI-approved
impact safety goggles and appro-
priate hearing protection. THEN:
a. Disconnect the Nailer from its air
supply.
b. Empty the Magazine (79) com-
pletely.
c. Try to re the Nailer into a piece of
scrap wood to ensure that there is
no trapped air in the system.
d. Always leave Magazine open dur-
ing maintenance. The Magazine
is spring-loaded and may cause
parts or a nail to y out of Nailer.
1. If a nail is jammed in the discharge
area, simply remove it with pliers.
2. If a nail is jammed in the magazine,
pull the Tab (75) all the way back
to the disengaged position. Using a
screwdriver, attempt to release the
jammed nail by probing either or both
of the two openings in the maga-
zine to release the nail. Pull out the
jammed nail and the remainder of the
nail strip that is still in the magazine.
3. Dispose of the remaining nail strip;
it may be bent or damaged in some
other way. Reload the magazine with
a new nail strip.
4. Be careful. When pulling back
the Tab, it will spring forward with

SKU 98751 For technical questions, please call 1-800-444-3353. Page 14
force. Keep your ngers clear when
releasing.
5. If you are unable to clear the nail
jam using the method prescribed
above, the tool should be taken to
a qualied service technician for
proper servicing.
User-Maintenance Instructions
Procedures not specically
explained in this manual
must be performed only by a
qualied technician.
TO PREVENT
SERIOUS INJURY
FROM ACCIDENTAL
OPERATION:
Turn off the tool, detach the
air supply, safely discharge
any residual air pressure in
the tool before performing any
inspection, maintenance, or
cleaning procedures.
TO PREVENT SERIOUS
INJURY FROM TOOL
FAILURE:
Do not use damaged
equipment. If abnormal
noise, vibration, or leaking
air occurs, have the problem
corrected before further use.
TO PREVENT EXPLOSION:
Lubricate the tool only
with specied 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 ammable, causing an
explosion.
WARNING! Anytime any
maintenance or repairs are
done, wear ANSI-approved
impact safety goggles and
appropriate hearing protection.
THEN:
a. Disconnect the Nailer from its air
supply.
b. Empty the Magazine (79) com-
pletely.
c. Try to re the Nailer into a piece of
scrap wood to ensure that there is
no trapped air in the system.
d. Always leave Magazine open dur-
ing maintenance. The Magazine
is spring-loaded and may cause
parts or a nail to y out of Nailer.
6. Dirt in the air supply is a major cause
of pneumatic tool wear. Use a lter in
the compressed air system for better
performance and longer tool life.
7. Make sure Trigger (59) and Safety
Nosepiece (42) move freely, with-
out sticking. Do not use nailer if
Trigger or Safety Nosepiece sticks.
8. Wipe down exterior of the Nailer with
a clean cloth before storing.
9. Store in a clean, dry and safe location
out of reach of children. REV 09e
User-Maintenance

SKU 98751 For technical questions, please call 1-800-444-3353. Page 15
Troubleshooting
Problem Possible Causes Likely Solutions
Air leaking in Cylinder Cap (8). 1. Loose Screw (6).
2. Gasket (9) is cracked or worn.
1. Tighten and recheck.
2. Replace Gasket.
Lack of power. Slow to cycle.
Low power when shooting and
returning.
1. Tool is too dry.
2. Air pressure too low.
3. Exhaust blocked.
1. Add about 3 drops of pneumatic
tool oil into the Air Coupler (95).
2. Check to make sure regulator on
air compressor is set between
70 PSI and 120 PSI.
3. Clean exhaust channel.
Not shooting fasteners or only
intermittent feeding.
1. Damaged Torsion Spring (89).
2. Wrong size of fasteners.
3. Magazine (79) or Joint Plate
(86) is dirty.
1. Replace Spring.
2. Use 2” to 3-1/2” Nails.
3. Clean Magazine and Plate.
Fastener is jammed in tool.
1. Driver channel is worn.
2. Feeder Shoe (73) is broken or
worn.
3. Bent fasteners.
4. Nailer angle is not properly
adjusted for the correct angle
nail clip.
1. Replace Driver Channel (30)
and/or Driver (20).
2. Replace Feeder Shoe.
3. Remove bent fasteners.
Replace with new fasteners.
4. Check all 3 angle adjustments
as outlined on page 10.
Follow all safety precautions whenever diagnosing or servicing the
tool. Disconnect air supply before service.
REV 08j
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
THATALLREPAIRSAND 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 98751 For technical questions, please call 1-800-444-3353. Page 16
PARTS LIST
Part Description Quantity
1 Screw 1
2 Spring Washer 3
3 Bushing 1
4 Exhaust Cover 1
5 Seal 1
6 Screw 3
7 Spring Washer 2
8A Cylinder Cap 1
9A O-Ring sealing 3
10 Washer 3
11 Valve Seat 1
12 Spring 2
13 O-Ring (M57.5 x 3.6) 1
14 O-Ring (M72.4 x 3.5) 2
15 Valve 1
16 Screw 1
17 Cylinder Seal 1
18 Collar 1
19 O-Ring (M54.4 x 4) 1
20 Driver 1
21 Cylinder 1
22 O-Ring (M67 x 3) 1
23 O-Ring (M60.25 x 2.5) 1
24 Restrictive Seal 1
25 O-Ring (M97.5 x 3.5) 1
26 Bumper A 1
27 Bumper B 1
28 Body 1
29 O-Ring (M62.3 x1.8) 1
30 Driver Channel 1
31 Spring Washer 1
32 Screw 1
33 Washer 1
34 Pin 1
35 Pin Washer 1
36 Bar Guide 1
37 Spring 1
38 Screw 1
39 Washer 2
40 Bracket A 1
41 Depth Screw 1
42 Safety 1
43 Rubber Cover 1
44 Spring Pin 1
45 Safe Guide 1
46 O-Ring (M20.3 x 2.5) 1
47 O-Ring (M20.3 x 1.5) 1
48 Valve Set 1
PARTS LIST
Part Description Quantity
49 O-Ring (M9.5 x 1.9) 1
50 O-Ring (M10.3 x 1.9) 1
51A Trigger Valve Head 1
52 O-Ring (M12.8 x 1.9) 1
53 Spring 1
54 O-Ring (M5.5 x 1.5) 2
55 Trigger Valve Stem 1
56 O-Ring (M24.8 x 2) 2
57 Trigger Valve Guide 1
58 Spring 1
59 Trigger 1
60 Seal 1
61 Trigger Pin 1
62 Nut 1
63 Washer 5
64 Screw 3
65 Turn Plate B 1
66 Bushing 1
67 Turn Plate A 2
68 Bushing 2
69 Screw 1
70 Coil Spring Base 1
71 Pin 1
72 Screw 1
73 Movable Feeder Shoe 1
74 Screw 1
75 Tab 1
76 Spring Washer 1
77 Joint Block 1
78 Screw 1
79 Magazine 1
80 Screw 1
81 Rail 1
82 Washer 1
83 Nut 2
84 Joint Guide 1
85 Adjuster Knob 1
86 Joint Plate 1
87 Support 1
88 Lock 1
89 Torsion Spring 1
90 Bushing 1
91 Nut 1
92 Soft Grip Sleeve 1
93 O-Ring (M65.4 X 2.5) 1
94 End Cap 1
95 Air Coupler 1
REV 10a
Parts List

SKU 98751 For technical questions, please call 1-800-444-3353. Page 17
REV 10a
28
29
30
31
32
33
34
35 36
37
38
39
40
39
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
54
57
58
59
60
61
68
67
39
69
66
64
63 65
63
70
71
63
12
73 74 75
64
76
77
63
64 63
62 78
79
80
81
82
83 2
84
85
6
86
6
83
282 87
88
89
90
63
62
7
91
92
93
94
95
16
Some parts are listed and shown for
illustration purposes only, and are not
available individually as replacement parts.
ASSEMBLY DIAGRAM
6
7
8A
9A
10
11
12
13
14
15
14
17
18
19
20
1
2
3
4
5
21
22
23
24
25
26
27
Parts Diagram

SKU 98751 For technical questions, please call 1-800-444-3353. Page 18
Record Product’s Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
REV 10a
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • [phone]
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 activity, 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 complaint must accompany the merchandise.
If our inspection veries 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 specic 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 • [phone]