Makita BFT043F Manual

Specification
Standard equipment
Optional accessories
No
Battery BL1430
Battery BL1430A
Fast charger DC18RA
Charger DC18SD
Charger DC24SC
Automotive Charger DC18SE
Auto refresh adapter ADP03
Battery protector (for BL1430A)
Protectors (red/ blue/ yellow/ clear)
Torque adjust tool
Grip base (for Grip 37)
Grip 37 (Side grip)
Anti-kickback head for Spindle M
Anti-kickback head for Spindle N
BFT043F BFT083F BFT125F
Model
Specifications
No load speed: rpm= min-1 80 150
25 65
1.5 (3.3)
Battery
Driving shank: mm (")
Weight according to
EPTA-Procedure 01/2003*: kg (lbs)
LED Job light
Torque adjustment
Reversing switch
Electric brake
Soft start
Torque range: N.m (in.lbs) 1 - 4 (8.9 - 35) 3 - 8 (27 - 71) 5 - 12 (44 - 106)
Yes
Yes
Yes
Yes
Yes
Hex 6.35 (1/4)
Cell
Voltage: V
Capacity: Ah
Li-ion
14.4
3.0
Max output: W
*with Battery BL1430
Model No.
Description
PRODUCT
CONCEPT AND MAIN APPLICATIONS
P1/ 14
BFT043F, BFT083F, BFT125F
Cordless Screwdrivers 14.4V
These three cordless screwdrivers for fastening works in assembling line
have been developed as sister models of BFT040F series.
Additionally to the same tool durability and high fastening torque accuracy
as the current series models, these products feature low rotational speed for
soft joint applications such as fastening rubber parts; gaskets, hoses, etc.
These products are powered by 14.4V/ 3.0Ah Li-ion batteries
BL1430/ BL1430A*.
These products are available in the following specifications
with the model numbers described below.
BFT125FZ
BFT043FZ
BFT083FZ
5 - 12 (44 - 106)
1 - 4 (8.9 - 35)
3 - 8 (27 - 71) No No
Model No. Torque range:
N.m (in.lbs) type quantity Charger
No
Battery
cover
No
Battery
*Not compatible with 14.4V/1.3Ah Li-ion battery BL1415
TECHNICAL INFORMATION
L
H
Dimensions: mm (")
Width (W)
Height (H)
Length (L) 200 (7-7/8)
255 (10)
72 (2-13/16)
W

P 2/14
1R004 Retaining ring S pliers ST-2
1R035
1R036
Bearing setting plate 15.2 installing Ball bearing 6801LLB and Ring 12
assembling Spindle section to Clutch case
assembling Spindle section to Clutch case
Bearing setting plate 17.2
1R237 Round bar for arbor 8-100
1R269
1R288
1R291 Retaining ring S and R pliers
1R145
1R219
1R220 Ratchet head 9.5 (1R219)
1R222
765027-4
1R314
1R311 Retaining ring pliers with long bent nails
Code No. Description Use for
BFT125FBFT043F
Model No.
Description
Item No.
Ring 38 Ring 38G Ring 38IRing 38H
Spindle M/ N Either Spiindle M or Spindle N is used. It differs from country to country.
Compression spring 19 Compression spring 19D Compression spring 19E Compression spring 19C
Cam C/ A Cam C
Clutch ass’y D Clutch ass’y F Clutch ass’y G
Cam A
Armature
Clutch ass’y (as an option
for quick repair of Clutch
section) consists of Item Nos.
Part No.619265-9 Part No.619267-5
29
23
36
39
54
BFT083F
Repair
[1] NECESSARY REPAIR TOOLS
removing/installing Ring spring 11
removing M5x10 Torx countersunk head screw from Spindle
L type Torx wrench set
Torx wrench shaft 7-23N.m
tightening M5x10 Torx countersunk head screw to Spindle
Socket adapter (1R219)
Bearing extractor removing Ball bearing 6801LLB and Ring 12 from Spindle
removing Steel balls
removing/installing Ring spring 10 from/on Spindle M/ N
removing Retaining ring R-21
assembling M5x10 Torx countersunk head screw to Spindle
disassembling Clutch section
Torque adjust tool
Torx bit VT-25
Screwdriver magnetizer
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
Note: Some parts numbers and descriptions differ from model to model. Refer to the following list and replace the
descriptions in this technical information. (for example, Cam C/ A means Cam C or Cam A.)
Plate Plate G Plate IPlate H1
43
32 33 43 34 35 36 37
38 39 40 41 42 62

P3/14
Item No. Description Lubricant Amount
2g in total
a little
Portion to lubricate
Item No. Description
: Makita grease N. No.2 (2g)
: ThreeBond 1303 or Loctite 603
: Seal lubricant No.101
Compression spring 19
Cam D
35
34
38
40
Gear case
44
50
47
48
49
Spindle
Steel ball 5.0 (3pcs.)
Steel ball 4 (3pcs.)
Steel ball 3 (13pcs.)
35
34
Spindle
34
38
40
Cam A/ C
Carrier complete B
Spur gear 18 (3pcs.)
Spur gear 9 complete B
Spur gear 19 (3pcs.)
Internal gear 47
44
50
47
48
49
Three shaft pins for 47
47 49
49
Repair
Apply the following lubricants to protect parts and product from unusual abrasion (Fig. 1):
Apply ThreeBond 1303 or Loctite 603. (Fig. 1)
[2] LUBRICANT AND ADHESIVE APPLICATION
LUBRICANT
Threaded portion for engaging with M12 Lock nut Seal lubricant
No.101
(042010-1A: 100g)
Whole surface
Whole surface
Whole surface
Teeth portion that engages with and
Teeth portion
Teeth portion and three shaft pins for
Teeth portion
Portion to apply adhesive
Inner threaded portion for M5x10 Torx countersunk head screw
Ball bearing
6805LLB
Lock washer
Motor bracket M5x10 Torx countersunk head screw
Flat washer 7
Fig. 1
Makita grease
N. No.2
ADHESIVE

P4/ 14
Fig. 5 Fig. 6 Fig. 7
[3] -2. Spindle Section
Clutch case
Compression spring 5
Clutch section
Spindle section
Fig. 3
M4x4 (+) Pan head
screw (silver)
Ring 38
Clutch case cover
Clutch case
DISASSEMBLING
DISASSEMBLING
Steel ball 3 (2pcs.)
Compression spring 13 Spindle M/ N
Ring spring 10
Fig. 2
M4x8 Pan head screw (black)
Switch lever
Compression spring 2
Fig. 4
M4x22 (+) Pan head screw (4pcs.)
Clutch case
Clutch section
(= Clutch ass’y)
Housing
Retaining ring R-21
1R311
Clutch case
Switch unit
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Bit Holder Section
Bit holder section can be disassembled from Spindle M/ N
by removing Ring spring 10 from the groove of Spindle M/ N
by using 1R291. (Fig.2)
Flat washer 11 Sleeve
groove
(1) Disassemble Bit holder section from Spindle M/N. (Refer to [3] -1. Bit Holder Section.)
(2) Remove Ring 38 from Clutch case by unscrewing M4x4 (+) Pan head screw (silver),
then remove Clutch case cover from Clutch case by unscrewing M4x8 Pan head screw (black).
Switch lever and Compression spring 2 can be removed now. (Fig. 3)
(3) Remove Clutch case from Housing by unscrewing four M4x22 (+) Pan head screws.
Clutch section (= Clutch ass’y) now can be removed from Housing. (Fig. 4)
Note:Be careful not to lose Compression spring 5 located in Clutch section.(Fig. 5)
(4) Remove Retaining ring R-21 that holds Spindle section in place on Clutch case using 1R311. (Fig. 6)
(5) Remove Spindle section from Clutch case by tapping the end surface of Clutch case with plastic hammer. (Fig. 7)

P5/ 14
Ring 12
Ball bearing
6801LLB
1R269
Ring spring 11
1R004
Ring 12
Ball bearing
6801LLB
Spindle M/ N
Ball bearing
6801LLB
1R035
Spindle M/N
Ball bearing
6801LLB
1R311
Retaining ring R-21
1R237
Clutch case
Spindle M/ N
section
DISASSEMBLING
ASSEMBLING
1R269
arbor press
Ring spring 11
1R004
arbor press
1R036
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Spindle Section
(6) Remove Ring spring 11 with 1R004. (Fig. 8)
(7) Remove Ball bearing 6801LLB with 1R269. (Fig. 9)
(8) Remove the other Ball bearing 6801LLB together with Ring 12 by using 1R269. (Fig. 10)
Fig. 8 Fig. 9 Fig. 10
(1) Assemble Spindle M/ N section by using 1R035, arbor press and 1R004. (Figs. 11 and 12)
Note: Ring spring 11 is deformed in the disassembling step.
Be sure to use new Ring spring 11 when assembling Spindle M/ N section. (Fig. 12)
(2) Assemble Spindle M/ N section to Clutch case by using 1R237, 1R036, arbor press and 1R311. (Fig. 13 and 14)
Fig. 11 Fig. 12
Fig. 13 Fig. 14
Fit Retaining ring 21 exactly
into this inner groove to hold
Spindle M/ N section securely.

P6/ 14
[3] -3. Clutch Section
Compression
spring 19
Compression spring 19
Adjust ring complete
Cam D
Steel ball 4
(3pcs.)
Steel ball 5.0
(3pcs.)
Cam C/ A
Steel ball 3
(13pcs.)
Cam A/ C
M12 Lock nut
Adjust ring complete
Clutch section
(=Clutch ass’y)
ASSEMBLING
DISASSEMBLING
765027-4
M12 Lock nut
Spindle
Cam D
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Spindle Section (cont.)
(3) Make sure that Compression spring 5 is located in place in Clutch section before assembling Clutch section and
Clutch case to Housing. (Fig. 5)
(4) Assemble Clutch section and Clutch case to Housing by screwing four M4x22 (+) Pan head screws. (Fig. 4)
Then put the Lead wires of Switch unit and LED Job light in place as illustrated in Fig. D-3.
(5) Put Switch lever and Compression spring 2 in the space between Switch unit and Clutch case. (Fig. 3)
(6) Secure Clutch case cover to Clutch case with M4x8 Pan head screw (black). Then secure Ring 38 to Clutch case
with M4x4 (+) Pan head screw (silver). (Fig. 3)
It is recommended to wholly replace Clutch section with Clutch ass’y when it is broken.
However, if you need to replace some component part(s) of Clutch section independently,
disassemble/assemble Clutch section as described below.
(1) Take out Clutch section. (Figs. 3 and 4)
Note: Be careful not to lose Compression spring 5. (Fig. 5)
(2) Insert 765027-4 into the hole of Adjust ring complete, and turn it counterclockwise to reduce the tension of
Compression spring 19. M12 Lock nut (left-hand threaded) can now be removed by turning it in the direction of
the black arrow by hand. (Fig. 15)
(3) Remove Adjust ring complete, Flat washer 18 and Compression spring 19 from Spindle. (Fig. 16)
(4) The following Steel balls can be removed as drawn in Fig. 17:
Steel ball 3 (13pcs.), Steel ball 4 (3pcs.), Steel ball 5.0 (3pcs.)
Note: Use a screwdriver magnetized by 1R288 for easy removal of Steel balls.
Fig. 15 Fig. 16
Flat washer 18
Fig. 17
Steel ball 4 (3pcs.) and Steel ball 5.0 (3pcs.)
can be removed by moving Cam D towards
the threaded end of Spindle.
After removing Steel ball 4 (3pcs.) and Steel ball 5.0 (3pcs.),
Steel ball 3 (13pcs.) can be removed by moving Cam C/ A
towards Cam D.

P7/ 14
Fig. 18
Fig. 19
DISASSEMBLING
6mm
Spindle
Flat washer 7Cam C/ ACam D
Spindle
ASSEMBLING
Spindle
1R219
1R220
1R222
1R314
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -3. Clutch Section (cont.)
(5) Insert short leg of hex wrench 6 into the hole of Spindle, and fix long leg of the hex wrench securely in vise.
Insert No.T25 Torx wrench of L type Torx wrench set (1R145) into the socket of M5x10 Torx countersunk head screw.
Then remove the screw by turning No.T25 Torx wrench counterclockwise as illustrated to left in Fig. 18.
The following parts can be removed from Spindle: Cam D, Cam C/ A, Flat washer 7. (right in Fig. 18)
M5x10 Torx countersunk
head screw
No.T25 Torx wrench
M5x10 Torx countersunk
head screw
Do the reverse of the disassembling steps.
Note: When fastening M5x10 Torx countersunk screw to Spindle, do as described in Fig. 19.
Apply Sealing lubricant No.101 to all Steel balls and the Spindle's threaded portion before assembling.
(Fig. 1) Be careful not to put the grease in the threaded hole of Spindle and Torx screw.
M5x10 Torx countersunk head screw
Clean up this threaded portion
with gasoline or kerosene to
remove oil or grease.
Clean up this threaded hole
with gasoline or kerosene
to remove oil or grease from
the inner threaded portion.
Put about three drops of
ThreeBond 1303 or Loctite 603
in this threaded hole.
Fix Spindle in vise. Then fasten M5x10 Torx countersunk
head screw to the recommended torque of
8-10N.m by turning clockwise by using 1R219,
1R220, 1R222 and 1R314.
Note: Wipe away any adhesive that might ooze out.
Hex wrench 6

P 8/ 14
Gear section
Motor section
DISASSEMBLING
Plate
Lens
Housing (R)
Brush holder cap
Carbon brush
Housing (L)
Gear section
Switch unit
Switch
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -4. Motor and Gear Section
(1) Remove Bit holder section, Switch lever, Clutch case and Clutch section (=Clutch ass’y) from Housing.
(Figs. 2, 3 and 4)
(2) After removing Brush holder cap and Carbon brush, remove Housing (L) from Housing (R) by loosening
eight M3x20 Pan head screws. Then remove Switch unit from Gear section. (Fig. 20)
(3) Disconnect Lead wires of Endbell complete from Switch, then lift up and remove the assembly of Gear section and
Motor section from Housing (R). Pull off Gear section from Motor section while turning Motor bracket in the direction
of the arrow. (Fig. 21)
Fig. 20
Fig. 21
Pan head screw
M3x20 (8pcs.)
Lead wire of
Endbell complete
Motor bracket

P 9/14
ASSEMBLING
Carrier complete B
Internal gear 47
Gear case
Gear case
pliers
Endbell complete
Armature
Gear case
Disassembling Motor Section Disassembling Gear Section
Spur gear 9 complete B
Gear case Internal gear 47
DISASSEMBLING
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -4. Motor and Gear Section (cont.)
(4) Remove Endbell complete from Armature, then pull Armature from Yoke unit. (Fig. 22)
(5) Remove Lock washer by turning it with pliers. Gear section now can be disassembled as drawn in Fig. 23.
Fig. 22 Fig. 23
Note:
Be careful not to pinch your fingers between
Armature and Yoke unit when removing/
installing Armature because Yoke unit has
strong magnetic force and pulls Armature
very strongly.
Yoke unit
Lock washer
Carrier complete B Spur gear 19
(3pcs.)
Ball bearing
6805LLB
Spur gear 18
(3pcs.)
(1) Apply Makita grease N No.2 (2g) to teeth portions of all Gears and all Shaft pins portion of the Carrier complete B
and Spur gear 9 complete B. (Fig. 1)
(2) Assemble Gear section as drawn in Figs. 24 and 25.
Fig. 24
Fig. 25
Lock Motor bracket in place
by turning clockwise.
Motor bracket
Lock washer
Spur gear 9
complete B
Spur gear 19
(3pcs.)
Shaft pins for
Spur gear 18
Shaft pins for
Spur gear 19
Spur gear 18
(3pcs.)
Ball bearing
6805LLB

P10/14
ASSEMBLING
Gear section
Switch unit
Housing (R)
Motor section
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -4. Motor and Gear Section (cont.)
3) Assemble Motor section. (Fig. 22)
Assemble Motor section and Gear section together while
turning Motor bracket in the direction of the arrow.
Then install Switch unit on Gear case, and connect Lead
wires of Endbell complete to Switch. (Fig. 26)
4) Put the assembly of Gear section and Motor section
in place on Housing (R), then fasten Housing (L) to
Housing (R) as drawn to left in Fig. 22.
Note:
Do not forget to install Plate and Lens on Housing (R).
See Figs. D-2 and D-3 for detailed information on wiring.
Note:
Ribs to hold Switch unit must face
the top side of the machine.
Fig. 26
ribs to hold
Switch unit
Motor bracket
Lead wire
of Endbell complete

P11/14
DISASSEMBLING
Micro switch
ASSEMBLING
DISASSEMBLING
ASSEMBLING
Controller
LED circuit
Buzzer circuit
Switch unit
Connector
Connector
Connector
Fig. 29
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -5. Switch Section
After removing F/R change lever, loosen the screw that fastens
Micro switch to Reverse switch.
Micro switch can be removed by pulling in the direction
of the gray arrow while turning it counterclockwise. (Fig. 27)
F/R change lever
Reverse switch
screw
Fig. 27
Fig. 28
(1) Assemble Micro switch to Reverse switch by fastening
the screw to the recommended torque of 0.29 - 0.34N.m.
(2) Assemble F/R change lever to Reverse switch by fitting
the boss of Reverse switch into the concave portion of
F/R change lever. (Fig. 28)
(3) Assemble Trigger switch section to Housing (R).
concave portion
of F/R change lever boss of Reverse switch
[3] -6. Replacing Switch Unit, LED Circuit, Buzzer Circuit
When removing LED circuit, Switch unit and Buzzer circuit,
disconnect Connectors in the direction designated with the arrow.
(Fig. 29)
Note: Do not pull Lead wires in case of disconnecting Connectors.
Pull Connectors to protect Lead wires from breaking.
Connect Connectors.
Refer to Circuit Diagram.

P 12/14
Black
White
Red
Orange
Blue
Purple
Gray
Terminal
COM NO
M2
S1
S2
M2
M1
Switch section
Connector
Connector
Connector
Color index of lead wires' sheath
Yellow
Line filter
(in case it is used)
Micro Switch
Reverse
switch
Controller
Circuit diagram
Fig. D-1
Switch
unit
LED
circuit
Buzzer
circuit
DC Motor
(Endbell)

P 13/14
Lead wire (black)
Endbell complete
Connector
Switch unit
rib
Lead wire (red)
Controller
Wiring diagram
(1) Wiring in Housing (R)
Fig. D-2
[Routing Lead wires (black, red) of Endbell complete]
Black wire: Route beside the right side of the LED cover
portion of Controller, then connect to No. M2
terminal of Switch section.
Red wire: Route beside the left side of the LED cover
portion of Controller, connect to No. M1
terminal of Switch section.
LED cover portion
Place the following parts outside of Housing (R):
• Connectors and Lead wires (purple, yellow)
that connect Controller with Switch unit
• Connectors and Lead wires (gray, blue)
that connect Controller with LED circuit
LED circuit
Route the following four
Lead wires between the rib
and the inside wall of
Housing:
Lead wires (black, red)
of Terminal
Lead wires (white, red)
of Buzzer circuit
Route the following seven Lead wires
of Controller between the ribs of
Switch section:
• two wires (white, orange)
to Micro switch of Switch section
• three wires (blue, purple, white)
to Reverse switch of Switch section
• two wires (red, white)
to Buzzer circuit
Note:
Be careful not to pinch these
Lead wires between Switch section
and the inside wall of Housing.
Note: See next page for wiring of Switch unit and Switch section.
Put the Connectors
in the space between
this line and Terminal.
Buzzer
circuit
Be sure to place Sponge
of Buzzer circuit on
Housing (L) side.
Controller
Switch
rib
Locate Line filter
in this position
in case it is used.

Controller
Switch section
P 14/ 14
Wiring on Switch section
1
raised portion
Lead wire holder
3
2
6
4
5
Switch unit
LED circuit
Micro switch
from Controller (blue)
from Controller (white)
Fix the Lead wires with these Lead wire holders.
Wiring diagram
(2)Wiring on the outside of Housing
Fig. D-3
Wiring of Lead wires (yellow, purple) that connect Switch unit with Controller
(These Lead wires are covered by a protective tube and called as "Wire yp" in the illustration below.)
Switch unit
pin A of
Housing (L) Wire yp
Wire yp
pin B of
Housing (L)
flanged portion
of Clutch case
pin C of
Housing (L)
Note: Wire yp must be tight between
Switch unit and Lead wire holder of Housing (L).
Route Wire yp:
3 under pin A of Housing (L),
1 through the groove on Clutch case,
2 inside pin B of Housing (L),
6 between the raised portion and flanged portion of
Clutch case,
4 inside pin C of Housing (L),
5 through Lead wire holder of Housing (L).
Wire yp
Switch unit
Wiring on the shelf portion of Housing
Wire yp
shelf portion
of Housing
Put the following Connectors and slack portion of
Lead wires on the shelf portion of Housing:
• Connectors and Lead wires (including Wire yp)
that connect Controller with Switch unit
• Connectors and Lead wires that connect Controller
with LED circuit
Note:
Be sure to put the Connectors and the slack portion
in place carefully so that they are not pinched
between Housing and Clutch case cover.
LED circuit
Reverse
switch side
Micro
switch side
Assemble the receptacle on
each Lead wire to the terminal of
Switch section as illustrated below.
receptacle
from Endbell complete
(black)
[Reverse switch side] [Micro switch side] from Endbell complete
(red)
from Controller
(purple)
from Controller
(orange)
from Controller
(white)