Makita BlW120 User manual

Cordless Impact Wrench
Capacities
Standard bolt
High tensile bolt
Equipped with Electric Brake
No load speed Impacts Max fastening Overall Net
lRPMI per minute torque length weight
INSTRUCTION MANUAL
Battery Cartridge
BlW120
Voltage Battery Charger Input output Charging time
SPEC IF I CAT1 0 N S
BH1233 I 12 V 11 DCl4SA I A.C. only 50Hz ~ 60Hz I D.C. 7.2 V ~ 14.4V I 50mln.
x Manufacturer reserves the right to change specifications without notice.
* Note: Specifications may differ from country to country.
WARNING: For your personal safety, READ and UNDERSTAND before using
SAVE THESE INSTRUCTIONS
FOR FUTURE REFERENCE.

GENERAL SAFETY RULES USA0031
(For All Battery Operated Tools)
WARNING! Read and understand all instructions. Failure
tofollow all instructions listed below, may result in electric
shock, fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
Work Area
1. Keep your work area clean and well lit. Cluttered benches and dark areas invite
accidents.
2. Do notoperate power tools in explosive atmospheres, such as in the presence
of flammable liquids, gases, or dust. Power tools create sparks which may
ignite the dust or fumes.
3. Keep bystanders, children, and visitors away while operating a power tool.
Distractions can cause you to lose control.
Electrical Safety
4. A battery operated tool with integral batteries or a separate battery pack
mustbe recharged only
with the specified charger for the battery. A charger
that may be suitable for one type of battery may create
a risk of fire when
used
with another battery.
5. Use battery operated tool only with specifically designated battery pack.
Use of any other batteries may create a risk of fire.
Personal Safety
6. Stay alert, watch what you aredoing, and use common sense when operating
a power tool.
Do not use tool while tired or under the influence of drugs,
alcohol, or medication.
A moment of inattention while operating power tools
may result
in serious personal injury.
7. Dress properly. Do notwear loose clothingorjewelry. Containlonghair. Keep
your hair, clothing, and glovesaway from movingparts. Loose
clothes, jewelry,
or long hair can be caught
in moving parts.
8. Avoid accidental starting. Be sure switch is in the lockedor off position before
inserting battery pack. Carrying tools
with your finger on the switch or
inserting the battery pack into a tool
with the switch on invites accidents.
9. Remove adjusting keys or wrenches before turning the tool on. A wrench
or a key that is left attached to a rotating part of thetool may result
in personal
injury.
IO. Do notoverreach. Keepproper footing and balanceatalltimes. Proper footing
and balance enable better control of the tool
in unexpected situations.
11. Use safety equipment. Always wear eye protection. Dust mask, non-skid
safety shoes, hard hat, or hearing protection must be used for appropriate
conditions.
2

Tool Use and Care
12. Use clamps or other practical way to secure and support the workpiece to
a stable platform. Holding the work by handor against your body is unstable
and may lead to
loss of control.
13.
Do not force tool. Use the correct tool for your application. The correct tool
will do the job better and safer at the rate for which
it is designed.
14. Do not use tool if switch does not turn it on or off. A tool that cannot be
controlled with the switch is dangerous and must be repaired.
15.Disconnect battery pack from tool or place the switch
in the locked or off
position before making any adjustments, changing accessories, or storing
the tool. Such preventive safety measures reduce the risk of starting the tool
accidenta
I I y.
16.Store idle tools out of reach of children and other untrained persons. Tools
are dangerous in the hands of untrained users.
17. When battery pack is not in use, keep it away from other metal objects like:
paper clips, coins, keys, nails, screws, or other smallmetal objects that can
make a connection from one terminal to another. Shorting the battery
terminals together may cause sparks, burns, or a fire.
18. Maintain tools with care. Keep cutting tools sharp and clean. Properly
maintained tools
with sharp cutting edge are less likely to bind and are easier
to control.
19. Check for misalignment or binding of moving parts, breakage of parts, and
any other condition that may affect the tool's operation. If damaged, have
the tool serviced before using. Many accidents are caused by poorly
maintained tools.
20. Use only accessories that are recommended by the manufacturer for your
model. Accessories that may besuitable for one tool may create a risk of injury
when used on another tool.
Service
21. Tool service must be performed only by qualified repair personnel. Service
or maintenance performed by unqualified personnel may result in a risk of injury.
22. When servicing a tool, use only identical replacement parts. Follow
instructions
in the Maintenance section of this manual. Use of unauthorized
parts or failure tofollow Maintenance Instructions may create a risk of shock
or injury.
3

USEOZS-l
Specific Safety Rules
1. Holdtool by insulated gripping surfaces when performing an operation where
the cutting tool may contact hidden wiring. Contact with
a "live" wire will
also make exposed metal parts of the tool "live" and shock
the operator.
2. Be aware that this tool is always in an operating condition, because it does
not have to be plugged into an electrical outlet.
3. Wear ear protectors.
4. Check the socket carefully for wear, cracks or damage before installation.
5. Hold the tool firmly.
6. Always be sure you have a firm footing.
7. Be sure no one is below when using the tool in high locations.
8. The proper fastening torque may differ depending upon the kind or size of
the bolt. Check the torque
with a torque wrench.
SAVE THESE INSTRUCTIONS.
SYMBOLS
The followings show the symbols used for tool.
v .................................... volts
- .................................... direct current
n, .................................... no load speed
.../ min ................................... revolutions or reciprocation per minute
c- .................................... number of blow
4

usc002 2
IMPORTANT SAFETY INSTRUCTIONS
FOR CHARGER &
BATTERY CARTRIDGE
1. SAVE THESE INSTRUCTIONS
- This manual
contains important safety and operating instructions for battery charger.
2. Before using battery charger, read all instructions and cautionary markings on (1)
battery charger, (2)battery, and (3) product using battery.
3. CAUTION - To reduce risk of injury, charge only MAKITA rechargeable batteries
marked on the charger label. Other types of batteries may burst causing personal
injury and damage.
4. Do not expose charger to rain or snow.
5.
Use of an attachment notrecommended or soldby the battery charger manufacturer
may result in a risk of fire, electric shock, or injury to persons.
6. To reducerisk of damage toelectricplugand cord, pullby plugrather than cord when
disconnecting charger.
7. Makesure cordislocated so that it will notbestepped on, tripped over, or otherwise
subjected to damage or stress.
8. Anextension cordshouldnotbeused unless absolutely necessary.
Use of improper
extension cordcould result in arisk of fire and electric shock. Ifextensioncordmust
be used, make sure:
a. That pinsonplugof extensioncordare the same number, size, andshape as those
b. That extension cord is properly wired and in good electrical condition; and
c. That wire size is at least as large as the one specified
in the table below.
of plugon charger;
TABLE 1
RECOMMENDED MINIMUM AWG SIZE FOR
EXTENSION CORDS FOR BATTERY CHARGERS
I Length of Cord (Feet) I 25
I 50 1 100 I 150 1
I I
I AWGSizeofCord I 18 I 18 I 18 I 16 I
I I I I I I
9. Do not operate charger with damaged cord or plug - replace them immediately.
10. Do not operate charger if it has received a sharp blow, been dropped, or otherwise
damaged
in any way; take it to a qualified serviceman.
11. Do not disassemble charger or battery cartridge; take it to a qualified serviceman
when serviceor repair is required. Incorrect reassembly may result
in a risk of elec-
tric shock or fire.
12. To reduce risk of electric shock, unplug charger from outlet before attempting any
maintenance or cleaning. Turning off controls will not reduce this risk.
13.
If operatingtime has become excessively shorter, stopoperating immediately. It may
result
in a risk of overheating, possible burns and even an explosion.
14. If electrolyte gets into your eyes, rinse them out with clear water and seek medical
attention right away.
It may result in loss of your eyesight.
5

ADDITIONAL SAFETY RULES
FOR CHARGER
& BATTERY CARTRIDGE
1. Do not charge Battery Cartridge when temperature is BELOW 10°C (5OOF)
2. Do notattempt touse a step-uptransformer, anengine generator or DC power
3. Do not allow anything to cover or clog the charger vents.
4. A battery short can cause a large current flow, overheating, possible burns
or ABOVE 4OoC (104OF).
receptacle.
and even a breakdown.
(1) Do not touch the terminals with any conductive material.
(2) Avoid storing batterycartridge in a container with other metalobjects such
(3) Do not expose battery cartridge to water or rain.
ture may reach or exceed 5OoC
(122OF).
completely worn out. The battery cartridge can explode in a fire.
as nails, coins, etc.
5. Donot store the tool and Battery Cartridge in locations where the tempera-
6. Do not incinerate the Battery Cartridge even if it is severely damaged or is
SAVE THESE INSTRUCTIONS.
SYMBOLS
The followingshow the symbolsusedforthecharger. Besurethat you understandtheirmeaningbeforeuse.
@ +
0 Readyto charge
0 Charging
0 Chargingcomplete
#E & 0 Delaycharge (Cooling)
wx 0 Defectivebattery
0 Conditioning
x 0 Coolingabnormality
6

FUNCTIONAL DESCRIPTION
Installing
or removing battery cartridge
*Always switch off the tool before inser-
tion or removal
of the battery cartridge.
To remove the battery cartridge, withdraw
it from the tool while slidingthe buttonon
the side
of the cartridge.
*To insert the battery cartridge, align the
tongue on the battery cartridge with the
groove in the housing and slip
it into
place. Always insert it
all the way until it
locks in place with
a little click. If you can
see the red part on the upper side
of the
button, it is not locked completely. Insert
it fully until the red part cannot be seen. If
not,
it may accidentally fall out of the tool, causing injury to you or someone aroundyou.
Do not use force when inserting the batterv cartridqe. If the cartridQe does not slide in
easily, it is not being inserted correctly
Charging
*Plug the battery charger into the proper
AC voltage source. Two charging lights
will flash in green color repeatedly.
Insert the battery cartridge into charger
until it stops adjusting to the guide
of
charger. Terminal cover of charger can be
opened with inserting and closed with
pulling out the battery cartridge.
When the battery cartridge is inserted,the
charging light color will change from
green to red and charging will begin. The
charging light will keep lighting up lit
steadily during charging.
One redcharging light indicates chargedcondition in
0 - 80% and two redones indicates
With finish of charge, the charging lights will change from two red ones to two green
80 - 100%.
ones.
The chargingtime is as follows:
Battery
BH1220: approx. 30 minutes.
Battery BH1233:approx.
50 minutes.
If you leave the battery cartridge in the charger after the charging cycle is complete, the
charger will switch into its “trickle charge (maintenancecharge)” mode which will last
approximately
24 hours.
*After charging, unplugthe chargerfrom the power source.
7

NOTE:
The battery charger is for charging Makita battery cartridge. Never use it for other pur-
poses or for other manufacturer's batteries.
When you charge a new batterycartridge or a batterycartridge which has not been used
for
a long period of time, it may not accept a full charge. This is a normal condition and
does not indicate
a problem.You can rechargethe battery cartridgefully after discharging
itcompletely and recharging
a couple of times.
If you charge a battery cartridgefrom a just operatedtool or a battery cartridgewhich has
been left in
a location exposed to direct sunlight for a long time, the charging light may
flash in redcolor. If this occurs, wait for
a while. Charging will begin after the battery car-
tridge
is cooled by the coolingfan installed inthe charger. When the temperature on bat-
tery is more than approx. 70°C. two charging lights may flash in red color, and when
approx. 50°C
- 70"C, one charging light inredcolor.
If the charging light flashes alternately in green and red color, charging is not possible.
The terminals on the charger or battery cartridgeare cloggedwith dust or the batten/car-
tridge isworn out or damaged.
Coolingsystem
This charger is equippedwith coolingfan for heatedbattery in order to enable the battery
to prove its own performance. Sound of cooling
air comes out during cooling, which
means nottrouble on the charger.
-Trouble on cooling fan
-Incomplete cool down of battery,such as, beingcloggedwith dust
The battery can be chargedin spite of the yellow warning light. But the chargingtime will
be longer than usual in this case.
Check the sound of coolingfan, vent on the charger and battery, which can be sometime
cloggedwith dust.
The cooling system is in order although no sound of cooling fan comes out, if the yellow
warning lightwill not flash.
*Always keep clean the vent on charger and battery for cooling.
*The products should be sent to repair or maintenance, if the yellow warning light will
Conditioningcharge
Conditioningcharge can extend the life of battery by automatically searching the optimum
charging condition for the batteries in every situations.
The battery employed in the following conditions repeatedly, will be worn out shortly, and
yellow warning light may flash.
*Yellow light will flash for warning inthe following cases.
frequently flash.
1. Rechargeof batterywith its hightemperature
2. Recharge of battery with its lowtemperature
3. Rechargeof full charged battery
4. Over-discharge of battery (continueto discharge battery inspite of downof power.)
5. Rechargeunder broken cooling system
The charging time of such battery is longer than usual.
8

Tricklecharge (Maintenancecharge)
If you leave the battery cartridge, in the charger to prevent spontaneous discharging after
full charge, the charger will switch into its "trickle charge (maintenance charge)" mode
and keepthe battery cartridge fresh and fully charged.
Tips for maintainingmaximum battery life
1. Chargethe battery cartridge before completely discharged. Always stop tool operation
2. Never recharge a fully charged battery cartridge. Overcharging shortens the battery
3. Charge the battery cartridgewith room temperature at 10°C - 40°C (50°F - 104"F)..Let
4. Charge the NickelMetal Hydride battery cartridge when you do not use it for morethan
and charge the battery cartridge when you notice less tool power.
service life.
a hot battery cartridge cool down before charging it.
six months.
Switch action
CAUTION:
Before inserting the battery cartridge into the tool, always check to see that the switch
trigger actuates properlyand returns to the
To start the tool, simply pull the trigger.
Tool speed is increased by increasing pres-
sure on the trigger. Release the trigger to
stop.
"OFF" position when released.
9

Reversingswitch action
CAUTION:
Always check the direction of rotation before operation.
*Use the reversing switch only after the tool comes to a complete stop. Changing the
When not operating the tool, always set the reversing switch lever to the neutral posi-
direction
of rotation before thetool stops may damagethe tool.
tion.
This tool has a reversing switch to change
the direction
of rotation. Depress the
reversing switch lever from the A side for
clockwise rotation or from the
B side for
counterclockwise rotation. When the re-
versing switch lever is in the neutral posi-
tion, the switch trigger cannot bepulled.
Reversingswitch lever
I
Clockwise Counterclockwise
10

ASSEMBLY
Selectingcorrect socket
Always usethe correct size socket for bolts and nuts.An incorrect size socket will result in
inaccurateand inconsistent fastening torque and/or damage to the bolt or nut.
Installing or removingsocket
Always be sure that the tool is switched off and the battery cartridge is removed before
installing or removingthe socket.
To install the socket, push it onto the anvil
of the tool until it locks intoplace.
To removethe socket, simply pull it off.
11

OPERATION
The proper fastening torque may differ depending upon the kind or size of the bolt, the
material of the workpiece to be fastened, etc. The relation betweenfastening torque and
fastening time is shown inthe figures below.
Standardbolt
N .m
(ft . Ibs) I
(72)
100
a,
60
.- g (43)
20
(14)
0
1.0 2.0 3.0
Fasteningtime
High tensile bolt
Properfasteningtorque for MI4(9/16")
Proper fastening torque for M12
(1/2')
Properfastening torque for MI0 (3/8")
Seconds
N .m
(ft
. Ibs)
120 -
(87)
Proper fastening torque for M12 (1/2")
Proper fastening torque for MI0 (3/8")
Proper fastening torque for ME (5116")
Seconds
1.0 2.0 3.0 4.0 5.0
Fasteningtime
12

Hold the tool firmly and place the socket over the bolt or nut. Turn the tool on and fasten
for the proper fastening time.
NOTE:
When fastening screw M8 or smaller, carefully adjust pressure on the switch trigger so
Holdthe tool pointed straight at the bolt.
*If you fasten the bolt for a time longer than shown in the figures, the bolt or the
socket may be overstressed, damaged, etc. Before starting your job, always perform a
test operation to determine the properfasteningtime for your bolt. Especiallyfor the bolt
other than
M8 (5/16"). perform the above test operation to preventthe trouble on socket
or bolt, etc.
that the screw is not damaged.
The fastening torque is affected by
a wide variety of factors including the following. After
fastening, always check the torque with a torque wrench.
1. When the battery cartridge is discharged almost completely, voltage will drop and the
2. Socket
fastening torque will be reduced.
Failureto use the correct size socket will cause a reduction inthe fastening torque.
A worn socket (wear on the hex end or square end) will cause a reduction inthe fas-
tening torque.
3. Bolt
.Even though the torque coefficient and the class
of bolt are the same, the proper
Eventhough the diameters of bolts are the same, the properfastening torque will dif-
4. The manner of holding the tool or the material of driving position to be fastened will
5. Operatingthe tool at low speed will cause a reduction inthe fastening torque.
fastening torque will differ accordingto the diameter of bolt.
fer according to the torque coefficient, the class of bolt and the bolt length.
affectthe torque.
13

MAINTENANCE
CAUTION:
Always be sure that the tool
is switched off and the battery cartridge is removed before
attemptingto performinspection or maintenance.
Replacingcarbon brushes
Remove and check the carbon brushes
regularly. Replace when they wear down to
the limit mark. Keep the carbon brushes
clean and free to slip in the holders. Both
carbon brushes should be replaced at
the same time. Use only identical carbon
brushes.
Use
a screwdriver to remove the brush
holder caps. Take out the worn carbon
brushes, insert the new ones and secure
the brush holder caps.
Limitmark
To maintain product SAFETY and RELIABILITY,repairs, any other maintenance or adjust-
ment should be performedby Makita Authorized
or FactoryService Centers, always using
Makita replacement parts.
14

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.
The accessories
or attachmentsshouldbe used only inthe properand intendedmanner.
.Batterycharger
Model
DCl4SA
Shoulderstrap
Plastic carryingcase
BatterycartridgeBH1220 / BH1233
Protector
15

ITEM NO DESCRIPTION
I
2
3
4
6
8
17
I8
19
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
31
38
39
40
41
42
43
46
41
HOUSING SET
INC
4243
NAME PLATE
TAPPING SCREW
4x18
F/R CHANGE LEVER
SWITCH CJLA-IA-TD
PIN
2 5
HAMMER CASE COMPLETE
TAPPING SCREW
4x25
NYLON WASHER 18
ANVIL
HAMMER
STEEL BALL
3 5
FLAT WASHER 24
COMPRESSION SPRING 25
FLAT WASHER 24
SPINDLE
SPUR GEAR
22
PIN 5
FLAT WASHER 12
INTERNAL GEAR 51
STEEL BALL 5 6
BALLBEARING 690ILLB
INTERNALGEARCASE
YOKE UNIT
ARMATURE
ENDBELL COMPLETE
CARBON BRUSH
CB-431
BRUSH HOLDER CAP
FET SPACER
TAPPING SCREW
ST3X8
HOUSING SET
INC
1.43
MAKITA LABEL
SUPPORT PLATE
TERMINAL
NO USED
1
i
7
1
1
1
1
4
1
1
1
25
t
1
1
1
2
2
1
1
2
1
1
1
1
1
1
2
1
1
1
1
1
1
17

I
MAKITALIMITED ONE YEAR WARRANTY
WARNING
Some dust created by power sanding, sawing, grinding, drilling, and other
construction activities contains chemicals known [tothe State of Califomia]to
cause cancer, birth defects or other reproductive harm. Some examples of
these chemicals are:
0 Leadfrom lead-based paints,
0 Crystalline silica from bricksand cement and other masonry products, and
0 Arsenic andchromiumfrom 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 masksthat are specially designed
to filter out microscopicparticles.
Warranty Policy
Every Makita tool is thorou ly inspected and tested before leaving the factory. It is warranted to
be free of defects from workanshipand materials for the period of ONE YEAR from the date of
original purchase. Should any trouble develop during this one-year period, return the COMPLETE
tool, freight prepaid, toone of Makita’s Factory or Authorized Service Centers. If inspection shows
the trouble is caused by defective workmanship or material, Makita will repair (or at our option,
replace) without charge.
This Warranty does
not apply where:
repairs have been made or attempted by others:
repairs are required because of normal wear and tear:
The tool has been abused, misused or improperly maintained;
8 alterationshave been made to the tool.
IN NO EVENT SHALL MAKITA BE LIABLE FOR ANY INDIRECT, INCIDENTAL OK CON-
SEQUENTIAL DAMAGES FROM THE SALE
OR USE OFTHE PRODUCT. THIS DISCLAIMER
APPLIES BOTH DURING AND AFTER THE TERM OF
THIS WARRANTY.
MAKITA DISCLAIMS LIABILITY
FOR ANY IMPLIED WARRANTIES, INCLUDING IMPLIED
WARRANTIES OF “MERCHANTABILITY” AND “FITNESS FOR A SPECIFIC PURPOSE,”
AFTER THEONE-YEAR TERM OFTHISWARRANTY.
This Warranty gives you specific legal rights, and you may also have other rights which vary from
state to state. Some states do not allow the exclusion or limitation of incidental or consequential
damages,
so the above limitation or exclusion may not apply to you. Some states do not allow
limitation on how long an implied warranty lasts,
so the above limitation may not apply to you.
Makita Corporation
3-11 -8,Sumiyosh/-cho,
Anjo, Aichi 446-8502 Japan
884377-061
PRINTED IN JAPAN