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T ECHNICAL INFORMATION
Models No. BFT081F
PRODUCT
P 1 / 14
L
Description Cordless Screwdriver 12V
CONCEPT AND MAIN APPLICATIONS
Model BFT081F has been developed as a the 12V version of
Model BFT080F 9.6V cordless screwdriver.
H
12V Ni-MH provides rotational speed higher than the 9.6V model
to ensure higher operation efficiency.
Also designed to tighten screws to turning angle higher than BFT080F
to cover wider range of fastening applications in assembly lines.
W
Dimensions: mm (")
Length (L) 200 (7-7/8)
Width (W) 71 (2-13/16)
with BH1220C 242 (9-1/2)
Height (H)
with BH1233C 251 (9-7/8)
Specification
Cell Ni-MH
Voltage: V 12
Battery
2.0 (Battery BH1220C)
Capacity: Ah
3.3 (Battery BH1233C)
No load seed: min-1=rpm 700
Driving shank: mm (") Hex 6.35 (1/4)
Hard joint 3 - 8 (26.6 - 70.8)
Torque range: N.m (in.lbs)
Soft joint 3 - 7.5 (26.6 - 66.4)
Electric brake Yes
Torque adjustment Yes
Reverse switch Yes
LED job light Yes (with afterglow function)
Externally accessible brush Yes
Net weight: w/ BH1220C (2.0Ah battery) 1.5 (3.3)
kg (lbs) w/ BH1233C (3.3 Ah battery) 1.7 (3.7)
Standard equipment
Adjust grip ............... 1 pc (exclusively for UAS, Canada and Italy)
Protector ................... 1 pc (exclusively for Germany)
Note: The standard equipment for the tool shown above may differ by country.
Optional accessories
Battery BH1220C (2.2Ah) Adjust grip
Battery BH1233C (3.3Ah) Protector (red)
Charger DC24SA Protector (blue)
Charger DC24SC Protector (yellow)
Charger DC18SC Grip base set
Charger DC14SA Grip 37
Charger DC14SC
Automatic refreshing adapter ADP03
P 2 / 14
Features and benefits
High Rotational Speed (No load Speed: 700rpm)
Provides high operation efficiency.
Designed to tighten screws to turning angle higher than BFT080F
to cover wider range of fastening applications in assembly lines.
Torque range on soft joint is;
BFT081F: 3 - 7.5N.m
BFT080F: 3 - 6.5N.m
Powered by 12V Slide-type Ni-MH Batteries;
BH1220C (2.2 Ah)/ BH1233C (3.3 Ah)
Note: All advantages described below are the same as the BFT080F.
High Torque Accuracy Color Coded Adjust Grip (option) for Strict
Identification Plate Torque Control at Assembling Line
10% Cm > 1.67
=
For easy tool and Adjust grip
application identification Without adjust grip,
Protector (option) it is impossible to
Protects the workpiece. change torque setting.
Also resists impacts that
can damage tool.
Two-Piece D28 Motor
With replaceable armature and
Rubber-Coated Bit Sleeve
powerful rare earth magnet
Protects the workpiece.
Externally Accessible Brushes
LED Job Light
For convenience and longer tool life
with Afterglow Function
Activates when trigger is pulled Indication Lamp and Beeper
for low light conditions.
Easy-to-Operate,
Indication lamp
Large On/Off Switch
Equipped with soft start function Indicate fastening sufficiency and
and delayed restarter battery power conditions as follows;
*Sufficient fastening: with green lamp on
Conveniently Located
*Insufficient fastening: with red lamp on
Push-Button Type
and beeps
Forward/Reverse Switch
*Warning that remaining battery power is
a little: with red lamp on and beeps
Nut and Bolt Construction Anti-Slip Dimpled Grip *Battery power remaining is too little to
run the tool.: Stops motor with red lamp
Allows repeat disassembly, Provides more control and on and beeps.
preventing damage to the housing. less fatigue.
Built-in Electronic System Side Grip (option)
Soft Start function to suppress return torque at start-ups. Ensures safe and easy control
Delayed Restarter controls the motor so that it does not of the machine when tightening
start until one second passes after a screw has been driven; screws to high turning angle.
the motor does not start even if switch trigger is pulled.
Auto Battery Shut-off ensures consistent fastening torque.
P 3 / 14
Features and benefits
Referring to the "Limit Capacity Graphs" below, select the machine to match your application.
Limit Capacity Graphs
[BFT020F, BFT021F] 9.6V
Turning angle (degree)
360
300
240
180 Fair Zone
120
60
0
0 0.5 1 2 3 4 5 6 7 8 9 10 11 12
Torque (N.m)
[BFT040F] 9.6V
Turning angle (degree)
360
300
240
180 Fair Zone
120
60
0
0 1 2 3 4 5 6 7 8 9 10 11 12
Torque (N.m)
[BFT080F] 9.6V
Turning angle (degree)
360
300
240
180 Fair Zone
120
60
0
0 1 2 3 4 5 6 7 8 9 10 11 12
Torque (N.m)
[BFT081F] 12V
Turning angle (degree)
360
300
240
180 Fair Zone
120
60
0
0 1 2 3 4 5 6 7 8 9 10 11 12
Torque (N.m)
[BFT122F] 12V
Turning angle (degree)
360
300
240
180 Fair Zone
120
60
0
0 1 2 3 4 5 6 7 8 9 10 11 12
Torque (N.m)
P 4 / 14
Features and benefits
Lists of the Electronic Functions and Reminders
1. When a screw has been driven completely at preset torque, or when there is no trouble in the machine;
Electronic Reminders
When function What LED indicator lamp and
Function Lamp of the Beeping works Alarm buzzer remind the user
LED Indicator of Buzzer
Turns on first To ensure that LED indication lamp and Alarm
Checking LED Rapid Just after the battery is
in green, then buzzer works normally; if there is no trouble in
lamp and alarm succession of installed on the machine
in red and electronic parts, each reminder turns on and
buzzer short beeps
finally in white. beeps as described to the left columns.
To ensure that a screw has been driven completely
at preset torque. The Auto fastening stop system
When a screw has been helps the user avoid overtightening.
Auto fastening Turns on fastened completely at For approximate one second after Auto fastening
stop & Delayed No beeping stop system works, the tool does not start even if
in green. preset torque and
restart the trigger switch is pulled as long as the lamp is
the clutch is released
on in green. The Delayed restart system helps
the user avoid accidental overtightening which
will be caused by fault operation of trigger switch.
2. When a screw has not been driven completely at preset torque, or when there is some trouble in the machine;
Electronic Reminders
What LED indicator lamp and
Function Lamp of the Beeping Corrective Action to Take
Alarm buzzer remind the user
LED Indicator of Buzzer
Incomplete tightening has been Tighten the screw once again.
Warning Against
Turns on performed, because the trigger switch It is important to keep on
Incomplete A long beep
in red. has been released before the fastening pulling the trigger switch till
Tightening
torque reaches preset one. the clutch is released.
Although the motor will run,
Slow It is appropriate time to replace the it is recommended to replace
Battery Power Blinks slowly
repetition of battery with full-charged one because the battery by full-charged one.
Reminder in red.
long beeps the battery power is getting low. The reminders turn off when
battery voltage recovers.
Replace the battery with full-
charged one to avoid incomplete
Auto Battery Turns on There is not battery power enough
A long beep tightening.
Shut-off in red. to tighten a screw at preset torque.
The reminders turn off when
the battery cartridge is removed.
Replace the battery with full-
Abnormal drop in battery voltage
Blinks in red charged one to avoid incomplete
Anti-Resetting Repetition of has been caused for some reason.
and green tightening.
of Controller long beeps The motor does not start even if the
alternately. The reminders turn off when
trigger switch is pulled.
the battery cartridge is removed.
Warning Against Immediately remove the battery,
Quick The controller or motor is overheated.
Overheated Blinks in red and cool down the machine.
Repetition of The motor does not start even if the
Controller or quickly. The reminders turn off when the
short beeps trigger switch is pulled.
Motor machine temperature gets low.
Blinks in red Quick repetition This indicates the abnormal condition
Motor
and green Ask Makita service centers.
Malfunction of short beeps. of motor. The tool does not operate.
alternately.
Release the trigger switch.
Warning Against
The reminders turn off when the
Fault Position of The battery cartridge has been
Blinks in red trigger switch is released.
Trigger Switch Repetition of installed on the machine with the
and green This function helps the user
(when installing long beeps trigger switch being pulled to the
alternately. avoid accidental start-ups when
the battery on the "On" position.
installing the battery cartridge
machine)
on the machine.
P 5 / 14
Comparison of products
Model No. Makita
Specifications BFT081F BFT080F
Voltage: V 12 9.6
Ni-MH Battery
Capacity: Ah 2.0 / 3.3 2.0 / 3.3
Hard Joint 3-8 3-8
Torque range: N.m
Soft Joint 3 - 7.5 3 - 6.5
No load speed: min.-1= rpm 700 540
28 28
Center height: mm (")
(1-1/8) (1-1/8)
LED Job light with afterglow function Yes Yes
Externally accessible carbon brush Yes Yes
200 200
Length
(7-7/8) (7-7/8)
Dimensions: mm (") 71 65
Width
(2-13/16) (2-9/16)
242 251
Height*
(9-1/2) (9-7/8)
1.5 1.3
with 2.0 Ah battery
Net weight: (3.3) (2.9)
kg (lbs)
1.7 1.5
with 3.3 Ah battery
(3.8) (3.3)
*with 2.0 Ah battery
P 6 / 14
Repair
CAUTION: Remove the saw blade from the machine for safety before repair/ maintenance !
[1] NECESSARY REPAIRING TOOLS
Code No. Description Code No. Description
1R004 Retaining ring pliers ST-2 200MM 1R269 Bearing extractor
1R035 Bearing setting plate, diameter 15.2 1R291 Retaining ring S and R pliers
1R036 Bearing setting plate, diameter 17.2 1R311 Retaining ring pliers with long bent nails
1R237 Round bar for arbor 8-100 765025-8 Adjust grip
[2] LUBRICATION
Apply Makita grease N. No.2 to the following portions designated with the black triangle to protect
parts and product from unusual abrasion.
Item No. Description Portion to lubricate
44 Carrier complete A Each shaft portion on which (47) spur gear 13 is mounted
47 Spur gear 13 Teeth
Teeth portions which engages with (47) spur gear 13
48 Spur gear 20 complete Apply 2.0 g in total.
Each shaft portion on which (49) spur gear 19 is mounted
49 Spur gear 19 Teeth
50 Internal gear 47 Teeth
Fig. 1
Ball bearing 6805LLB
Gear case
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Disassembling Bit Holder Section
By removing Ring spring 10 out of the groove of Spindle using Makita repairing tool No. 1R291 etc,
you can disassemble Bit holder section as illustrated below. (Fig. 2)
Fig. 2
Flat washer Compression spring Steel ball 3 (2 pcs)
Ring spring 10 Sleeve Spindle
P 7 / 14
3) -2. Disassembling/Assembling Clutch Case Section
DISASSEMBLING
1) Remove the bit holder section using Makita repairing tool No.1R291, etc.
2) Remove M4x4 (+) Pan head screw and M4x8 (+) Pan head screw,
and then remove Clutch case cover, Compression spring 2 and Switch lever.
3) Remove four M4x22 Pan head screws. Take care not to let Compression spring 5 pop out at this time. (Fig. 3)
4) Remove Retaining ring R-21, and then strike the flange portion of Clutch case from the arrow side
with plastic hammer to take Spindle out of Clutch case. (Fig. 4)
5) By removing Ring spring 11 from Spindle using Makita repairing tool No. 1R004, you can replace
two 6801LLB Ball bearings and Ring 12 using Makita repairing tool No. 1R269, etc.
Fig. 3
Pan head
screw M4x22
Clutch case
Clutch section
Fig. 4
Compression
spring 5 Clutch case
Tap the flange portion
from this side with
plastic hammer, etc.
Spindle
ASSEMBLING
1) Press-fit two 6801LLB Ball bearings and Ring 12 to Spindle using arbor press and Makita repairing tool No. 1R035.
2) Install a new Ring spring 11 on Spindle using Makita repairing tool No. 1R004, etc.
3) Press-fit Spindle section to the Clutch case using Makita repairing tools Nos. 1R036 and 1R237 and arbor press.
And then install Retaining ring R-21.
4) Install Clutch section and Clutch case onto Housing, and fix them with four M4x22 Pan head screws.
5) Set the Compression spring 5 certainly in place. And then, as illustrated in Fig. 5 secure the Lead wire of the
Switch unit which stops clutch.
Fig. 5
Housing L
Lead wire holders
Clutch case
Lead wire
(Two lead wires are bundled up
with a heat shrink tube.)
In order to avoid loose wiring, be sure to secure the Lead wire by routing it through
the Lead wire holder as illustrated to left, and under the two Lead holders as illustrated to right.
6) Set Compression spring 2 and Switch lever in place, and then fix Clutch case cover with M4x8 Pan head screws.
7) Fix Ring 38 with M4x4 (+) Pan head screws.
8) Be careful not to mistake M4x8 Pan head screws (black color) from M4x4 (+) Pan head screws (silver color).
P 8 / 14
3) -3. Disassembling/Assembling Clutch Section
DISASSEMBLING
It is recommended to wholly replace Clutch Assembly when the Clutch section is broken. However, we describe below
how to disassemble/assemble the Clutch section so that you can repair the Clutch section by replacing the component
parts if you need to do.
(1) Remove Clutch section from Clutch case section.
(2) Insert Adjust grip into the hole of Adjust ring complete, and turn it counterclockwise to remove Lock nut M12.
Decrease in the pressure of Compression spring 19 allows you to remove Lock nut M12 by turning it clockwise
by hand. (Fig 5)
(3) Remove Adjust ring complete, Flat washer and Compression spring 19 from Spindle.
(4) While shifting the positions of Cam A(C) and Cam D, replace Steel ball 3.0 (13 pcs.), Steel ball 4.0 (3 pcs.)
and Steel ball 5.0 (3 pcs.).
Fig. 5
Adjust ring complete
Lock nut M12
Flat washer
Cam D
Cam A (C) Remove Lock nut M12 by turning
Adjust grip counterclockwise.
Compression spring 19
ASSEMBLING
(1) Apply Seal lubricant No. 101 to Steel ball 5.0 (3 pcs.), Steel ball 4.0 (3 pcs.) and Steel ball 3.0 (13 pcs.)
and set these Steel balls in place on the Cams. (Fig. 6)
(2) Apply Seal lubricant No. 101 to the threads of Spindle, and then assemble Compression spring 19,
Flat washer and Adjust ring complete to Spindle, and finally secure Lock nut M12 to Spindle by turning
it counterclockwise using Adjust grip, etc.
Fig. 6
Steel ball 3.0 (13 pcs) Cam A(C) Steel ball 5.0 (3 pcs)
Cam D Steel ball 4.0 (3 pcs)
Threads of Spindle
P 9 / 14
3) -4. Disassembling/Assembling Motor Section and Gear Case Section
Note: Use Gear assembly as a replacement part if you wish to replace entire Gear case section with new one.
DISASSEMBLING
1) Remove Carbon brushes from inside of Brush holders.
2) Remove Clutch case from Motor section, and then separate Housing L from Housing R by removing
M3x20 Pan head screws (8pcs.).
3) Remove Gear case section and Motor section by lifting them up. Turn Motor bracket counterclockwise
and pull Gear case section out. (Fig. 8)
4) Remove Motor bracket out of Armature, and pull the Armature out of Yoke unit.
Be careful not to pinch your finger between the parts, which attract one another by strong magnetic force.
5) Remove Lock washer by turning it counterclockwise with long-nose pliers or slotted screwdriver. (Fig. 9)
6) Now the following parts can be replaced: Carrier complete, Spur gears (3 pcs), Ball bearing 6805LLB,
Gear case, Spur gear 20 complete, Spur Gears (3 pcs), Internal gear 47
Fig. 8 Fig. 9
The position where Switch unit is installed
Lock washer
Motor bracket
Gear case section Yoke unit
Remove Lock washer by turning it
Remove the Motor section by turning
counterclockwise with pliers or slotted driver.
Motor bracket counterclockwise.
ASSEMBLING
1) Apply Makita grease N No.2 (approx. 2g in total) to the designated portion in the gear chamber as illustrated in Fig. 10.
Fig. 10
Carrier complete: Spur gear 20 complete:
Three shafts for Spur gear Gear portion and three shafts for Spur gear
Spur gear (3 pcs)
Spur gear Internal gear 47
2) Assemble the internal parts of Gear case as described in Figs. 11, 12.
Fig. 11 Fig. 12
Carrier complete
Internal gear 47
Ball bearing
6805LLB
Spur gear 20 complete
Gear case
Install Spur gear
(3 pcs) to the shafts Spur gear
of Carrier complete. (3 pcs)
(Continued to next page)
P 10 /14
3) -4. Disassembling/Assembling Motor Section and Gear Case Section (cont.)
3) Install Lock washer on Gear case. (Fig. 13)
Install Motor bracket onto Gear case by turning it clockwise until it is locked. (Fig. 14)
4) Complete Motor section by doing as described below:
Insert armature in Yoke unit, and then mount End bell on the commutator side of Armature. (Fig. 15)
5) Assemble Motor section to Gear case section (Fig. 16)
[Gear case section]
Fig. 13
[Motor section]
Lock washer Fig. 15
Yoke unit
Armature
Fig. 14
Motor bracket End bell
Note:
Be careful not to have your finger pinched between yoke unit and armature
because armature is pulled toward yoke unit by strong magnetic force.
Fig. 16
Gear section
Motor section
6) Place the Motor section so that Switch unit face the direction of Plate installed on Housing R.
And then install the Motor section and the Gear section on Housing R. (Fig. 18)
7) Set the following electrical parts in place on Housing R:
Trigger switch, F/R change lever, Buzzer circuit, Terminal, LED circuit
After setting Plate and Lens in place, secure Housing L with eight M3x20 Pan head screws. (Fig. 19)
Fig. 18 Fig. 19
Switch unit LED circuit Controller Plate
Housing L
F/R change lever
Lens
Trigger switch
Buzzer circuit
Housing R
Terminal
P 11/14
3) -5. Disassembling/Assembling Switch Section
DISASSEMBLING
1) After removing F/R change lever, remove the screw that fastens the micro switch. Then pull off the micro switch
from Trigger switch as illustrated in Fig. 20.
Fig. 20
F/R change lever
Trigger switch
Micro switch
Screw
Pull off the micro switch
while turning counterclockwise.
ASSEMBLING
1) Put the micro switch in place on Trigger switch, then fasten it with Fig. 21
the screw to the recommended torque of 0.29 - 0.34N.m.
Concave portion
2) Fitting the boss on Trigger switch in the concave portion of
of F/R change lever Boss on Trigger switch
F/R change lever, assemble Trigger switch and F/R change lever
together. (Fig. 21)
3) Mount the assembled switch section to Housing R. (Fig. 22)
3) -6. Replacement of Switch Unit, LED Circuit and Buzzer Circuit
1) When removing LED circuit, Switch unit and Buzzer circuit, Fig. 22
pull off the connector in the direction designated by the arrow.
See Fig. 22. and "Wiring in Housing" in the pages 13 and 14. Switch unit
To avoid the disconnection of lead wires, do not hold the lead
wires when removing the above parts. Always hold the
connectors themselves.
LED circuit Connector
2) Refer to "Circuit Diagram" in page 12 when connecting
the connectors. Connector
Connected to
controller
Connector
Buzzer circuit
P 12/14
Circuit diagram
Color index of lead wires
Black White
Red Yellow
Orange Blue
Purple Gray
Switch
Micro
switch
(On/Off
function)
Controller M
Reverse
function DC Motor
with built-in (End bell)
Indicator lamp
Terminal
Switch
unit
Connector
LED
circuit
Connector
Buzzer
circuit
Connector
P 13/14
Wiring diagram
[1] Wiring in Housing
Caution:
Be careful not to pinch lead wires
[A] Rear of Controller
when fastening Housing L to Housing R. Route the endbell lead wires (black, red)
beside each side of the LED cover on Controller.
Endbell
Put the following lead wires See "Replacement of lead wire
out of Housing: Switch unit, LED circuit (black)
*Lead wires (gray, blue) from and Buzzer circuit"
Endbell
Controller to LED circuit in page 12.
lead wire
*Lead wires (purple, yellow) (red)
from Controller to Switch unit
*Lead wires (gray, blue) from
LED cover
LED circuit to Controller
on Controller
Switch unit
See "Wiring to Switch" in page 14.
Controller
LED circuit
Route the following lead wires Switch [A]
between this rib and the inside
[B]
wall of Housing R:
*Lead wires (black, red) from
Controller to Terminal [B] Rear of Switch
*Lead wires (white, red) from rib
Controller to Buzzer circuit
Route the lead wires so that
this connector is placed below
this line. Buzzer
circuit
Connector
Set Buzzer circuit in place so that rib
the sponge-side faces the direction
of Housing L. Terminal
Route the following lead wires
between the ribs on Switch:
*Lead wires (white, orange) from
Flag receptacle Controller to the micro switch
Flag receptacle
on black lead wire *Lead wires (blue, purple, white)
on red lead wire
from Controller to the reverse
function portion of Switch
*Lead wires (white, red) from
Terminal Controller to Buzzer circuit
Caution:
Be careful not to pinch the above
wires between Switch and Housing.
P 14/ 14
Wiring diagram
[2] Wiring Around Clutch Case
Switch unit
As illustrated to left,
A route lead wires
(purple, yellow) of
Lead wires Switch unit under the pin.
of Switch unit
Pin
Clutch case [View from A]
Route lead wires (purple, yellow) of switch unit between
the two pins and clutch case.
Be sure that the lead wires are tight on the clutch case.
Put the sag of the lead wires into this opening
as illustrated below.
Pin
Fix the lead wires securely
with this lead wire holder.
[3] Wiring to Switch
Switch base side 1) Connect the receptacle on each lead wire to the
corresponding terminal on Switch.
2) Fix the lead wires (black, white) from Controller
securely with lead wire holders.
Micro switch side
[View from micro switch side] [View from switch base side]
Lead wire (red)
from Endbell
Lead wire (purple) Lead wire (black)
from Controller from Endbell
Micro switch
Lead wire (blue)
Lead wire (orange) from Controller
from Controller
Lead wire (white)
Lead wire (white) from Controller
from Controller Lead wire holders
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