ECHNICAL INFORMATION
PRODUCT
T
P 1/ 7
Models No.
Description
BFS440, BFS450
L
Cordless Screwdriver
CONCEPT AND MAIN APPLICATIONS
H
Models BFS440 and BFS450 have been developed as a single-shot type
Cordless Screwdriver, featuring more convenience with one-touch locator
and LED job light.
W
(The image above is BFS450.)
These products are available in the following variations.
Dimensions: mm (")
Length (L) 258 (10-1/8)*1
Width (W)
Height (H)
80 (3-1/8)
193 (7-5/8)
*1. It differs by country.
BFS440
Battery
type
Plastic
carrying case
Model No.
Charger
Housing color
Offered to
quantity
2
BL1430
(Li-ion 3.0Ah)
No
BFS440RFE
DC18RA
No
Yes
No
Makita-blue All countries except North America
BFS440Z
BFS450
BL1830
(Li-ion 3.0Ah)
BFS450RFE
BFS450Z
2
DC18RA
No
Yes
No
Makita-blue All countries except North America
No
All models also include the accessories listed in "Standard equipment".
Specification
Model
BFS440
BFS450
Specification
Voltage: V
14.4
18
Battery Capacity: Ah
1.5 or 3.0*2
Cell
Li-ion
Max output: W
235
325
No load speed: min.-1 = rpm
4,000
Driver bit: mm (")
Capacities: mm (")
[drywall]
Shank
6.35 (1/4) Hex
Diameter
4 (5/32)
Reverse switch
Yes
Yes
LED job light
Net weight*3: kg (lbs)
1.7 (3.8)
1.9 (4.2)
*2. 1.5Ah: Battery BL1415 or BL1815; 3.0Ah: Battery BL1430 or BL1830
*3. BFS440: includes battery BL1430; BFS450: includes battery BL1830
Standard equipment
Phillips bit 2-25 ...................... 2 Magnetic connect bit 6.35-60 (Magnetic connect bit 6.35-76) ...................... 1
Belt clip ................................... 1
Note: The standard equipment for the tool shown above may differ by country.
Optional accessories
Phillips bit 1-25
Phillips bit 2-25
Phillips bit 3-25
Magnetic connect bit 6.35-60
Fast charger DC18RA
Charger DC24SA (for North America only)
Charger DC24SC (for all countries except North America)
Magnetic connect bit 6.35-76
Batteries BL1430, BL1415 (for BFS440)
Batteries BL1830, BL1815 (for BFS450)
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P 2/ 7
Repair
CAUTION: Remove the bit and the battery from the machine for safety before
repair/ maintenance in accordance with the instruction manual!
[1] NECESSARY REPAIRING TOOLS
Code No.
Description
Use for
1R269 Bearing extractor Removing Ball bearing 608
[2] LUBRICATION
Apply Makita grease FA.No.2 to the following portions designated with the black triangle to protect parts and product
from unusual abrasion.
Item No.
18
Description
Spindle
Portion to lubricate
Amount
(a) The drum portion that contacts Plane bearing 14
(b) The Cam portion that contacts 24 Clutch cam C
(c) The portion that contacts 18 Spindle
a little
19
Shoulder pin 8-10
(d) The Drum portion that contacts 24 Clutch cam C
21
20
Flat washer 25
Clutch cam C
Whole portion
4g
4g
Each depressed portion for Steel ball 4
(e) Teeth of the small gear that engages Helical gear 48
(f) Teeth of the large Gear that engages Armature's gear
24
Gear complete 18-44
31
Fig. 1
a little
Plane bearing 14
Makita grease FA.No.2
(a)
18
(c)
19
20
(d)
21
(b)
24
Steel ball 4.0
Helical gear 48
Ball bearing 608
(f)
31
(e)
Armature
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P 3/ 7
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -3. Locater Section
DISASSEMBLING
Pull Lock ring strongly. Locater complete and Lock ring can be removed together.
When removing Locater base complete together with Locater complete and Lock ring, etc.:
1 Loosen 4x18 Tapping screws (2 pcs.) and remove Front cover.
2 Loosen M4x25 Pan head screw and pull Locater base complete. (Fig. 2)
Locator section can be removed as illustrated in Fig. 3.
Fig. 2
Fig. 3
Leaf spring Ring spring 33
Locater base complete
Lock ring
Dust seal ring
2
M4x25
Pan head screw
Locater complete
1
Locater base complete Brake pin
Lock ring
Front cover
ASSEMBLING
4x18 Tapping screws (2 pcs.)
M4x25 Pan head screw Locater complete
Do the disassembling step in reverse.
[3] DISASSEMBLY/ASSEMBLY
[3] -4. Helical Gear 48, Clutch Section
DISASSEMBLING
1) Pull Lock ring strongly. Locater complete and Lock ring can be removed together.
2) Loosen 4x18 Tapping screws (9 pcs.) and remove Housing R. (Fig. 4)
3) Separate an assembly of Helical gear 48 and Clutch cam, etc. (Fig. 5) from Housing L and remove Ball bearing 608
with 1R269.
4) Remove Leaf spring by hooking and turning it with Long nose pliers. (Fig. 6) Do not lose Steel ball 3.5 on Spindle.
The assembly (Re: Fig. 5) can be removed by hand as illustrated in Fig. 7.
Fig. 4
Fig. 5
4x18 Tapping screws (9 pcs.)
Ball bearing 608
Housing R
Assembly of Helical gear 48 and Clutch cam, etc.
Fig. 6
Leaf spring
Fig. 7
Ball bearing Steel ball 4 Flat washer 26 Flat washer 25 Spindle Sleeve 20 Plane bearing 14
608 (3 pcs.) (2 pcs.)
Spindle
Long nose
pliers
Steel ball 4
Clutch cam C Compression spring 25 Shoulder pin 8-10 O ring 18
Helical
gear 48
Leaf spring
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P 4/ 7
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -4. Helical Gear 48, Clutch Section (cont.)
ASSEMBLING
Taking the steps described in Fig. 8 to 11.
Fig. 8
1) Put Flat washer 26 on the flanged portion of
Clutch cam C.
Note: Make sure that there is no space between
Flat washer 26 and the flanged portion.
2) While turning Compression spring 25
in the direction of the arrow, push it down
until it touches Flat washer 26.
Compression spring 25
Flat washer 26
Clutch cam C
Fig. 9
3) Apply Makita grease FA No.2 to
the inside wall of Clutch cam C
to prevent Steel Ball 4 (3 pcs.)
from falling off from Clutch cam C.
4) Put each Steel ball 4 in the concave portion on the inside wall
of Clutch cam C.
Then assemble Clutch cam C to Helical gear 48.
Steel ball 4
(3 pcs)
Clutch cam C
Helical gear 48
Fig. 10
5) Assemble the parts illustrated below into Clutch section.
Note:
Plane bearing 14
Steel ball 3.5
Apply Makita grease FA.No.2 to the specific portions of
Spindle and Shoulder pin 8-10 illustrated in Fig. 1.
Spindle
Shoulder pin 8-10
O Ring 18
Sleeve 20
Flat washer 25 (2 pcs)
Assembly of Helical gear 48
Ball bearing 608
Fig. 11
Rubber sleeve 10
Gear complete 18-44
Plane bearing 5
(front)
6) Assemble Gear section to Housing L.
Note: Do not forget to put Flat washer 5 between
Gear complete 18-44 and Plane bearing 5
(front).
Flat washer 5
Plane bearing 5
(rear)
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P 5/ 7
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -5. Motor Section
DISASSEMBLING
1) Remove Housing R (Fig. 4)
2) Disassemble Armature from the machine as illustrated in Figs. 12 and 13.
Fig. 12
Fig. 13
Brush holder
Carbon
brush
complete
Torsion
spring
2
1
Armature
Carbon
brush
1. Move the tail of Torsion spring
onto the notch of Brush holder.
2. Then pull off Receptacle from
Brush holder, then remove
Carbon brush.
Yoke unit
ASSEMBLING
1) Insert Armature into Yoke unit as described in Figs. 14 and 15.
2) Assemble Brush holder complete to the commutator end of Armature. (Fig. 12)
Fig. 14
Fig. 15
Yoke unit is not reversible when assembled
to Armature.
Be sure to assemble so that the notch in
Yoke unit is positioned on the drive-end
of Armature.
Because Yoke unit is a strong magnet, when assembling Armature
to Yoke unit, be sure to hold the commutator portion as illustrated
to left. Do not hold the Armature core as illustrated to right
or your fingers will be pinched between Yoke unit and the fan of
Armature that is pulled strongly by the magnet force.
If assembled wrong, the Motor section
cannot be assembled to Housing L.
[Correct]
[Wrong]
[Correct]
[Wrong]
Gear
Your fingers will be pinched
and injured.
notch
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P 6/ 7
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -5. Motor Section (cont.)
ASSEMBLING
3) Assemble the Motor section to Housing L as illustrated in Fig. 16.
Fig. 16
Assembling Brush Holder to Housing L
1) Fit Brush holder complete in the groove
of Housing L.
Housing L
groove
rib
2) The flat portion of Brush holder complete
must be at 90 degrees to the edge surface
of Housing L.
projection
flat portion of Brush holder complete
edge surface of
90 degrees
Housing L
Housing L
notch in Yoke unit Brush holder complete
Assembling Yoke Unit to Housing L
With the projection on Housing L fitting in the notch on Yoke unit,
put Yoke unit inside the four ribs on Housing L.
Brush holder complete
viewed from Front cover side
[3] -6. Switch
Fig. 17
ASSEMBLING
Put the projection on Switch between the prongs of F/R change lever,
then assemble the Switch to Housing L. (Fig. 17)
F/R change lever
prong
projection
Switch
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P 7/ 7
Circuit diagram
Fig. D-1
Color index of lead wires' sheath
Black
White
Red
Switch
Blue
Brush Holder
Complete
Yoke unit
LED
Circuit
Terminal
Wiring diagram
Fig. D-2
Switch lead wires (red, black)
must be passed between rib A and rib B.
Switch
rib B
rib A
Brush holder
complete
Switch lead wires
(red, black) must be
fixed with these
Lead wire holders.
LED
Terminal
Lead wires (red, black) of Brush holder complete
must be fixed with these lead wire holders.
Do not put any
Lead wire on
this rib to protect
from pinching.
Wire connecting portion
Connecting Flag Connector
to Terminal
Pole mark
Flag connector
The flag connector must be so connected that
the wire connecting portion is positioned on
the side of pole marks of Terminal.
Terminal
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