Makita AN923 User manual

1
ENGLISH (Original instructions)
INSTRUCTION MANUAL
IMPORTANT: Read Before Using.
Pneumatic Framing Nailer
AN923
AN943
007004

2
ENGLISH (Original instructions)
SPECIFICATIONS
Model AN923 AN943
Air pressure 0.44 - 0.83 Mpa (4.4 - 8.3 bar)
Nail Iength 50 mm - 90 mm
Nail capacity 64 - 74 pcs. 60 - 84 pcs.
Dimensions (L X H X W) 559 mm X 347 mm X 109 mm 455 mm X 365 mm X 109 mm
Min. hose diameter 8.5 mm
Net weight 4.0 Kg
• Due to our continuing programme of research and development, the specifications herein are subject to change without notice.
• Specifications may differ from country to country.
• Weight according to EPTA-Procedure 01/2003.
END106-3
Symbols
The following show the symbols used for the equipment.
Be sure that you understand their meaning before use.
･Read instruction manual.
･Wear safety glasses.
･Do not use on scaffoldings, ladders.
ENG905-1
Noise
The typical A-weighted noise level determined according
to EN792:
Model AN923
Sound pressure level (LpA) : 89 dB(A)
Sound power level (LWA) : 102 dB(A)
Uncertainty (K) : 3 dB(A)
Model AN943
Sound pressure level (LpA) : 92 dB(A)
Sound power level (LWA) : 105 dB(A)
Uncertainty (K) : 3 dB(A)
Wear ear protection
ENG904-1
Vibration
The vibration emission value determined according to
EN792:
Model AN923
Vibration emission (ah) : 4.0 m/s2
Uncertainty (K) : 1.5 m/s2
Model AN943
Vibration emission (ah) : 3.5 m/s2
Uncertainty (K) : 1.5 m/s2
ENG901-1
• The declared vibration emission value has been
measured in accordance with the standard test
method and may be used for comparing one tool
with another.
• The declared vibration emission value may also be
used in a preliminary assessment of exposure.
WARNING:
• The vibration emission during actual use of the
power tool can differ from the declared emission
value depending on the ways in which the tool is
used.
• Be sure to identify safety measures to protect the
operator that are based on an estimation of
exposure in the actual conditions of use (taking
account of all parts of the operating cycle such as
the times when the tool is switched off and when it
is running idle in addition to the trigger time).
ENH003-13
For European countries only
EC Declaration of Conformity
We Makita Corporation as the responsible
manufacturer declare that the following Makita
machine(s):
Designation of Machine:
Pneumatic Framing Nailer
Model No./ Type: AN923,AN943
are of series production and
Conforms to the following European Directives:
2006/42/EC
And are manufactured in accordance with the following
standards or standardised documents:
EN792
The technical documentation is kept by our authorised
representative in Europe who is:
Makita International Europe Ltd.
Michigan Drive, Tongwell,
Milton Keynes, Bucks MK15 8JD, England

3
30.1.2009
000230
Tomoyasu Kato
Director
Makita Corporation
3-11-8, Sumiyoshi-cho,
Anjo, Aichi, 446-8502, JAPAN
ENB067-3
IMPORTANT SAFETY
INSTRUCTIONS
WARNING: WHEN USING THIS TOOL, BASIC
SAFETY PRECAUTIONS SHOULD ALWAYS BE
FOLLOWED TO REDUCE THE RISK OF PERSONAL
INJURY, INCLUDING THE FOLLOWING:
READ ALL INSTRUCTIONS.
• For personal safety and proper operation and
maintenance of the tool, read this instruction
manual before using the tool.
• Always wear safety glasses to protect your eyes
from dust or nail injury.
WARNING: It is an employer's responsibility to
enforce the use of safety eye protection equipment
by the tool operators and by other persons in the
immediate working area.
• For Australia and New Zealand only
Always wear safety glasses and face shield to
protect your eyes from dust or nail injury. The safety
glasses and the face shield should conform with the
requirements of AS/NZS 1336.
WARNING: It is an employer's responsibility to
enforce the use of safety eye protection equipment
by the tool operators and by other persons in the
immediate working area.
Safety glasses
Face shield
000114
• Wear hearing protection to protect your ears
against exhaust noise and head protection. Also
wear light but not loose clothing. Sleeves should be
buttoned or rolled up. No necktie should be worn.
• Rushing the job or forcing the tool is dangerous.
Handle the tool carefully. Do not operate when
under the influence of alcohol, drugs or the like.
• General Tool Handling Guidelines:
(1) Always assume that the tool contains
fasteners.
(2) Do not point the tool toward yourself or
anyone whether it contains fasteners or not.
(3) Do not activate the tool unless the tool is
placed firmly against the workpiece.
(4) Respect the tool as a working implement.
(5) No horseplay.
(6) Do not hold or carry the tool with a finger on
the trigger.
(7) Do not load the tool with fasteners when any
one of the operating controls is activated.
(8) Do not operate the tool with any power source
other than that specified in the tool
operating/safety instructions.
• An improperly functioning tool must not be used.
• Sparks sometimes fly when the tool is used. Do not
use the tool near volatile, flammable materials such
as gasoline, thinner, paint, gas, adhesives, etc.;
they will ignite and explode, causing serious injury.
• The area should be sufficiently illuminated to
assure safe operations. The area should be clear
and litter-free. Be especially careful to maintain
good footing and balance.
• Only those involved in the work should be in the
vicinity. Children especially must be kept away at all
times.
• There may be local regulations concerning noise
which must be complied with by keeping noise
levels within prescribed limits. In certain cases,
shutters should be used to contain noise.
• Do not play with the contact element: it prevents
accidental discharge, so it must be kept on and not
removed. Securing the trigger in the ON position is
also very dangerous. Never attempt to fasten the
trigger. Do not operate a tool if any portion of the
tool operating controls is inoperable, disconnected,
altered, or not working properly.
• Operate the tool within the specified air pressure of
0.44 - 0.83 MPa (4.4 - 8.3 bar) for safety and longer
tool life. Do not exceed the recommended max.
operating pressure of 0.83 MPa (8.3 bar). The tool
should not be connected to a source whose
pressure potentially exceeds 1.37 MPa (13.7 bar).
• Make sure that the pressure supplied by the
compressed air system does not exceed the
maximum allowable pressure of the fastener
driving tool. Set the air pressure initially to the lower
value of the recommended allowable pressure (see

4
SPECIFICATIONS).
• Never use the tool with other than compressed air.
If bottled gas (carbon dioxide, oxygen, nitrogen,
hydrogen, air, etc.) or combustible gas (hydrogen,
propane, acetylene, etc.) is used as a power source
for this tool, the tool will explode and cause serious
injury.
• Always check the tool for its overall condition and
loose screws before operation. Tighten as required.
• Make sure all safety systems are in working order
before operation. The tool must not operate if only
the trigger is pulled or if only the contact arm is
pressed against the wood. It must work only when
both actions are performed. Test for possible faulty
operation with nails unloaded and the pusher in
fully pulled position.
• Make sure that the trigger is locked when the
change lever is set to the LOCK position.
• Check walls, ceilings, floors, roofing and the like
carefully to avoid possible electrical shock, gas
leakage, explosions, etc. caused by striking live
wires, conduits or gas pipes.
• Use only nails specified in this manual. The use of
any other nails may cause malfunction of the tool.
• Never use fastener driving tools marked with the
symbol "Do not use on scaffoldings, ladders" for
specific application for example:
−when changing one driving location to
another involves the use of scaffoldings,
stairs, ladders, or ladder alike constructions,
e.g. roof laths;
−closing boxes or crates;
−fitting transportation safety systems e.g. on
vehicles and wagons.
• Do not permit those uninstructed to use the tool.
• Make sure no one is nearby before nailing. Never
attempt to nail from both the inside and outside at
the same time. Nails may rip through and/or fly off,
presenting a grave danger.
• Watch your footing and maintain your balance with
the tool. Make sure there is no one below when
working in high locations, and secure the air hose
to prevent danger if there is sudden jerking or
catching.
• On rooftops and other high locations, nail as you
move forward. It is easy to lose your footing if you
nail while inching backward. When nailing against
perpendicular surface, nail from the top to the
bottom. You can perform nailing operations with
less fatigue by doing so.
• A nail will be bent or the tool can become jammed if
you mistakenly nail on top of another nail or strike a
knot in the wood. The nail may be thrown and hit
someone, or the tool itself can react dangerously.
Place the nails with care.
• Do not leave the loaded tool or the air compressor
under pressure for a long time out in the sun. Be
sure that dust, sand, chips and foreign matter will
not enter the tool in the place where you leave it
setting.
• Do not point the ejection port at anyone in the
vicinity. Keep hands and feet away from the
ejection port area.
• When the air hose is connected, do not carry the
tool with your finger on the trigger or hand it to
someone in this condition. Accidental firing can be
extremely dangerous.
• Handle the tool carefully, as there is high pressure
inside the tool that can be dangerous if a crack is
caused by rough handling (dropping or striking). Do
not attempt to carve or engrave on the tool.
• Stop nailing operations immediately if you notice
something wrong or out of the ordinary with the
tool.
• Always disconnect the air hose and remove all of
the nails:
1.When unattended.
2.Before performing any maintenance or repair.
3.Before cleaning a jam.
4.Before moving the tool to a new location.
• Perform cleaning and maintenance right after
finishing the job. Keep the tool in tip-top condition.
Lubricate moving parts to prevent rusting and
minimize friction-related wear. Wipe off all dust from
the parts.
• When not operating the tool, always lock the trigger
by turning the change lever to the LOCK position.
• Do not modify tool without authorization from
Makita.
• Ask Makita's Authorized service centers for
periodical inspection of the tool.
• To maintain product SAFETY and RELIABILITY,
maintenance and repairs should be performed by
Makita Authorized Service Centers, always using
Makita replacement parts.
• Use only pneumatic tool oil specified in this manual.
• Never connect tool to compressed air line where
the maximum allowable pressure of tool cannot be
exceeded by 10 %. Make sure that the pressure
supplied by the compressed air system does not
exceed the maximum allowable pressure of the
fastener driving tool. Set the air pressure initially to
the lower value of the recommended allowable
pressure.
• Do not attempt to keep the trigger contact element
depressed with tape or wire. Death or serious injury
may occur.
• Always check contact element as instructed in this
manual. Nails may be driven accidentally if the
safety mechanism is not working correctly.

5
SAVE THESE INSTRUCTIONS.
INSTALLATION
Selecting compressor
(CFM)
Compressor air outputper minute
Nailingfrequency (times/min.)
0
1
2
3
4
10 20 30 40 50
0.83Mpa(8.3bar)
0.64Mpa(6.4bar)
0.53Mpa(5.3bar)
0.44Mpa(4.4bar)
004293
The air compressor must comply with the requirements
of EN60335-2-34.
• Select a compressor that has ample pressure and
air output to assure cost-efficient operation. The
graph shows the relation between nailing frequency,
applicable pressure and compressor air output.
Thus, for example, if nailing takes place at a rate of
approximately 40 times per minute at a
compression of 0.59 MPa (5.9 bar), a compressor
with an air output over 3 CFM (ft3/minute) is
required. Pressure regulators must be used to limit
air pressure to the rated pressure of the tool where
air supply pressure exceeds the tool's rated
pressure. Failure to do so may result in serious
injury to tool operator or persons in the vicinity.
Selecting air hose
004294
• Use an air hose as large a diameter and as short as
possible to assure continuous, efficient nailing
operation. With an air pressure of 0.49 MPa (4.9
bar), an air hose with an internal diameter of over
8.5 mm (5/16") and a length of less than 20 m (6.6
ft.) is recommended when the interval between
each nailing is 0.5 seconds. Air supply hoses shall
have a minimum working pressure rating of 1.03
MPa (10.3 bar) or 150 percent of the maximum
pressure produced in the system whichever is
higher.
CAUTION:
• Low air output of the compressor, or a long or
smaller diameter air hose in relation to the nailing
frequency may cause a decrease in the driving
capability of the tool.
Lubrication
004295
To insure maximum performance, install an air set (oiler,
regulator, air filter) as close as possible to the tool. Adjust
the oiler so that one drop of oil will be provided for every
30 nails.
When an air set is not used, oil the tool with pneumatic
tool oil by placing 2 (two) or 3 (three) drops into the air
fitting. This should be done before and after use. For
proper lubrication, the tool must be fired a couple of times
after pneumatic tool oil is introduced.
1
007005
1. Pneumatic tool
oil

6
FUNCTIONAL DESCRIPTION
CAUTION:
• Always lock the trigger and disconnect the hose
before adjusting or checking function on the tool.
Nose adapter (Accessory)
CAUTION:
• Always lock the trigger and disconnect the hose
before installing or removing the nose adapter.
When nailing workpieces with easily-marred surfaces,
use the nose adapter.
Attach the nose adapter to the contact arm.
1
2
007803
Adjusting depth of nailing
1
A
B
007006
To adjust the depth of nailing, turn the adjuster. The
depth of nailing is the deepest when the adjuster is
turned fully in the A direction shown in the figure. It will
become shallower as the adjuster is turned in the B
direction. If nails cannot be driven deep enough even
when the adjuster is turned fully in the A direction,
increase the air pressure. If nails are driven too deep
even when the adjuster is turned fully in the B direction,
decrease the air pressure. Generally speaking, the tool
service life will be longer when the tool is used with a
lower air pressure and the adjuster set to a lower depth of
nail driving.
CAUTION:
• Always lock the trigger and disconnect the hose
before adjusting the depth of nailing.
Installing the hook
1
007062
CAUTION:
• Always lock the trigger and disconnect the hose
from the tool.
• Never hook the tool at high location or on
potentially unstable surface.
The hook is convenient for hanging the tool temporarily.
To use the hook, simply lift up hook until it snaps into the
open position.
When not in use, always lower hook until it snaps into the
closed position.
ASSEMBLY
CAUTION:
• Always lock the trigger and disconnect the hose
before carrying out any work on the tool.
Loading the nailer
007007
Select nails suitable for your work. Insert strip of nails into
the magazine.
011695
Load nails so that they get parallel to the driver guide.
1. Hook
1. Adjuster
1. Contact arm
2. Nose adapter

7
1
007008
Pull the pusher lever to the rear to engage the pusher to
the last nail.
Unloading the nailer
3
1
2
007009
Pull the pusher lever to the rear. Return the pusher lever
back while keeping the pusher depressed to disengage it
from the strip of nails.
Depress the nail stopper and remove the strip of nails
from the magazine.
1
007010
Connecting the air hose
12
007011
Lock the trigger. Slip the air socket of the air hose onto
the air fitting on the nailer. Be sure that the air socket
locks firmly into position when installed onto the air fitting.
A hose coupling must be installed on or near the tool in
such a way that the pressure reservoir will discharge at
the time the air supply coupling is disconnected.
OPERATION
CAUTION:
• Make sure all safety systems are in working order
before operation.
1. To drive a nail, you may place the contact element
against the workpiece and pull the trigger, or
1
007012
2
007013
2. Pull the trigger first and then place the contact
element against the workpiece.
• No. 1 method is for intermittent nailing, when you
wish to drive a nail carefully and very accurately.
No. 2 method is for continuous nailing.
CAUTION:
• However when the tool is set to the "Intermittent
Nailing" mode, WITH THE TRIGGER HELD IN A
HALF-PULLED POSITION, an unexpected nailing
could occur, if contact element is allowed to
re-contact against the workpiece or the other
surface under the influence of recoil.
In order to avoid this unexpected nailing, perform
as follows;
A. Do not place the contact element against the
workpiece with excessive force.
B. Pull the trigger fully and hold it on for 1-2 seconds
after nailing.
• For No. 1 method, set the change lever to
the position.
For No. 2 method, set the change lever to
the position.
After using the change lever to change the nailing
method, always make sure that the change lever is
properly set to the position for the desired nailing
method.
1. Air socket
2. Air fitting
1. Nail stopper
1. Pusher lever
2. Depress
3. Return
1. Pusher

8
1
2
3
4
007014
Anti dry fire mechanism
This tool is equipped with an anti dry fire mechanism.
When there are a few nails remaining in the magazine,
the contact arm will be locked in the undepressed
position to prevent the tool from being activated. Load
more nails to resume operation.
Jammed nailer
1
2
3
4
004308
CAUTION:
• Always lock the trigger, disconnect the hose and
remove the nails from the magazine before clearing
a jam.
When the nailer becomes jammed, do as follows:
Insert a small rod or the like into the ejection port and tap
it with a hammer to retract the driver.
Use pliers to bend the jammed nail so that the nail head
comes out of the slot in the driver guide. Then remove
the jammed nail.
1
2
004309
Nails
Nail
004310
Handle nail coils and their box carefully. If the nail coils
have been handled roughly, they may be out of shape or
their connector breaks, causing poor nail feed.
Avoid storing nails in a very humid or hot place or place
exposed to direct sunlight.
Nail
Humid Hot
004311
MAINTENANCE
CAUTION:
• Always disconnect the air hose from the tool before
attempting to perform inspection or maintenance.
• Never use gasoline, benzine, thinner, alcohol or the
like. Discoloration, deformation or cracks may
result.
Maintenance of the nailer
Always check the tool for its overall condition and loose
screws before operation. Tighten as required.
007015
With tool disconnected, make daily inspection to assure
free movement of the contact element and trigger. Do not
use tool if the contact element or trigger sticks or binds.
1. Pliers
2. Slot
1. Hammer
2. Small rod
3. Ejection port
4. Driver
1. Continuous
nailing
2. Trigger lock
3. Lock lever
4. Intermittent
nailing

9
007016
Make sure that the trigger is locked when the change
lever is set to the position.
1
2
007017
When the tool is not to be used for an extended period of
time, lubricate the tool using pneumatic tool oil and store
the tool in a safe place. Avoid exposure to a direct
sunlight and/or humid or hot environment.
007018
000219
Maintenance of the compressor, air set and air
hose
1
004317
1
004318
After operation, always drain the compressor tank and
the air filter. If moisture is allowed to enter the tool, It may
result in poor performance and possible tool failure.
Check regularly to see if there is sufficient pneumatic oil
in the oiler of the air set. Failure to maintain sufficient
lubrication will cause O-rings to wear quickly.
1
2
004319
Keep the air hose away from heat (over 60°C, over
140°F), away from chemicals (thinner, strong acids or
alkalis). Also, route the hose away from obstacles which
it may become dangerously caught on during operation.
Hoses must also be directed away from sharp edges and
areas which may lead to damage or abrasion to the hose.
Stove
Thinner
004320
1. Oiler
2. Pneumatic oil
1. Air filter
1. Drain cock
1. Trigger lock
2. Change lever

10
To maintain product SAFETY and RELIABILITY, repairs,
any other maintenance and adjustment should be
performed by Makita Authorized Service Centers, always
using Makita replacement parts.
OPTIONAL ACCESSORIES
CAUTION:
• These accessories or attachments are
recommended for use with your Makita tool
specified in this manual. The use of any other
accessories or attachments might present a risk of
injury to persons. Only use accessory or
attachment for its stated purpose.
If you need any assistance for more details regarding
these accessories, ask your local Makita Service Center.
• Nails
• Air hoses
• Safety goggles
NOTE:
• Some items in the list may be included in the tool
package as standard accessories. They may differ
from country to country.

11

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Makita Corporation
Anjo, Aichi, Japan
www.makita.com
884653C227