Makita BDF441 Manual

PRODUCT
TECHNICAL INFORMATION
P 1 / 7
Model No.
Description
CONCEPT AND MAIN APPLICATIONS
Specification
Standard equipment
Optional accessories
Dimensions: mm (")
Width (W)
Height (H)
Length (L) 238 (9-3/8)
78 (3-1/16)
255 (10)
BDF441
Cordless Driver Drill 13mm (1/2")
W
L
H
Note: The standard equipment for the tool shown above may differ by country.
Battery
Capacity of drill chuck: mm (")
Capacity: mm (")
Max. clutch torque: N.m (ft.lbs)
Electric brake
Variable speed control
Reversing switch
Max. fastening
torque: N.m (ft.lbs)
Torque setting
Steel
Wood
Soft joint
Hard joint
No load speed:
min-1=rpm
Cell
Voltage: V
Capacity: Ah
1st/ 2nd/ 3rd
Charger DC14SA
Charger DC14SC
Charger DC18SC
Charger DC24SA
Charger DC24SC
Li-ion battery BL1430
Assorted drill bits for wood
Assorted drill bits for metal
Philips bit 2-45 ....... 2 pc
Bit holder................ 1 pc
Belt clip................... 1 pc
Grip assembly.......... 1 pc Plastic carrying case ..... 1 pc
+ Screw M4x12 .............. 2 pc
Li-ion
14.4
3.0
Yes
Yes
Yes
Net weight*: kg (lbs)
*Includes battery BL1430
2.0 (4.4)
13 (1/2)
50 (2)
16 stage + drill mode
1.0 - 5.9 (0.7 - 4.3)
32 (23.6)
70 (51.6)
0 - 300/ 0 - 600/ 0 - 1,700
1.5 - 13 (1/16 - 1/2)
Max output (W) 265
Model BDF441 has been developed as an upgraded sister model of Model 6339D
with the design concept of "More Control and Maneuverability".
Features lightweight and compact design achieved by using 4-pole motor and
Lithium-ion battery as power unit.
Also features the same advantages as BDF440:
Rubberized soft grip contoured to perfectly fit operator hand and angled
to provide best tool balance
All metal gear construction
Job light with afterglow function
Single sleeve chuck
This new product will be available in the following variations.
BDF441SFE
BDF441
BL1430
(Li-ion 3.0Ah) DC18SC (Low voltage areas)
DC14SC (High voltage areas)
DC18SC
Model No. type quantity Charger Offered to
USA, Canada
Mexico, Panama
All countries except
those listed above
2
2
BDF441SFE3 3
Battery

P 2 / 7
Repair
[2] LUBRICATION
It is not required to lubricate the gear section because the portion is replaced as a factory-lubricated gear unit.
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Drill Chuck
Fig. 2
[1] NECESSARY REPAIRING TOOLS
CAUTION: Remove the battery cartridge from the machine for safety before repair/maintenance !
DISASSEMBLING
Description Use for
Hex wrench 10 Removing /mounting Drill chuck
Plastic hammer Removing Drill chuck
Hex wrench
Fig. 1
Note: It is required to remove Drill chuck when replacing Gear assembly, but you need not when replacing only Housing.
1) Open the jaws of Drill chuck fully, and remove the chuck screw (Flat head screw M6x22, left-handed and threadlocker
coated) by turning clockwise with impact driver in Forward rotation mode.
2) Insert a hex wrench into Drill chuck. Then set the Speed change lever in 1st speed, and Action mode change lever in
Drill mode as illustrated in Fig. 1. Holding the machine on work bench firmly, turn Drill chuck counter clockwise
by tapping the hex wrench. Now Drill chuck can be removed from Spindle. (Fig. 2)
Fig. 4 Fig. 5
ASSEMBLING
Hex wrench
Vise
End of the threaded
portion of Spindle
Drill chuck
Action mode
change lever
Speed change lever
Speed change lever:
in 1st speed
F/R change lever:
in Forward rotation mode
Action mode change lever: in Drill mode
Battery
1) Make sure that Flat washer 13 is set in place before installing Drill chuck. (Fig. 3)
1) Turn Drill chuck clockwise until it sits on the end of the threaded portion of Spindle.
(Fig. 4)
2) See Fig. 5. Insert a hex wrench into drill chuck, and fix the other end of hex wrench
in vise. Install battery. Then set the Action mode change lever in Drill mode,
the Speed change lever in 1st speed, and F/R change lever in Forward rotation mode.
3) Slowly pull the switch trigger to rotate Spindle until the motor is locked.
Note: Pull the trigger so that Spindle reaches full speed in one second.
Important: Be sure to release the switch trigger just after Spindle is locked.
4) Secure Drill chuck with the chuck screw by turning counterclockwise with impact driver.
Note: If you reuse the removed chuck screw, apply threadlocker to threaded portion.
Fig. 3
Flat washer 13
threaded portion
of Spindle

P 3 / 7
Repair
Fig. 6
Fig. 8 Fig. 9
Fig. 10
[3] -2. Gear Assembly and Motor Section
1) Remove Rear cover and take off Carbon brush from Brush holder complete. (Fig. 6)
Tapping screw
bind PT 3x16
Rear cover
1 2
[Brush holder section (View from A)]
Carbon brush
Carbon brush
Torsion spring
1. Move the tail of Torsion spring onto the notch
of Brush holder.
2. Then pull off Receptacle from Brush holder.
A
DISASSEMBLING
Gear section
Motor section
Speed change lever assembly Brush holder complete
Yoke unit
2) Unscrew four PT4x20 Tapping screws to disconnect
Gear assembly from Housing. Then by removing
eight PT3x16 Tapping screws, separate Housing R
from Housing L. (Fig. 7)
3) Pull off Heat sink fromYoke unit of the Motor section.
Then remove the assembly of the Gear section and
the Motor section from housing L. (Fig. 8)
3) Remove Brush holder complete from Armature,
then separate the Motor section from the Gear section.
(Fig. 9)
4) Put the Motor section on a work bench so that the
drive end of Armature touches the work bench.
Then separate yoke unit from armature by pulling it
down towards the work bench. (Fig. 10)
Assembly of the Gear section
and the Motor section Heat sink
Housing L
Tapping screw bind PT4x20 (4 pcs)
Tapping screw bind
PT3x16 (8 pcs)
Housing R
Fig. 7
Gear section (= Gear assembly)

P 4 / 7
Repair
[3] -2. Gear Assembly and Motor Section (cont.)
ASSEMBLING
Your fingers can be pinched
and injured.
[Wrong][Correct] [Wrong][Correct]
Notch
Fig. 9 Fig. 10
Fig. 12
Fig. 13
1) Assemble the motor section.
Note 1.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 as illustrated to left in Fig. 9. If assembled wrong, the Motor section cannot
be assembled to Housing (L).
Note 2. Because Yoke unit is a strong magnet, when assembling Armature toYoke unit, be sure to hold the commutator
portion as illustrated to left in Fig. 10. 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.
2) Insert the pinion gear on Armature shaft into Gear assembly, and engage it with the plant gears in Gear assembly.
Making sure that the pinion gear is engaged in Gear assembly, push Armature into Gear assembly. (Fig. 11)
3) See Fig. 12. Assemble Speed change lever assembly to the protrusion on Gear assembly.
Note: Before installing Gear assembly, make sure that two Leaf springs and two Compression springs are set in place
on Speed change lever as illustrated in Fig. 12.
4) Slide Speed change lever assembly to the position of either
"low" or "high". Then assemble Brush holder complete to
the Motor section. (Fig. 13)
Speed change lever assembly
Speed change lever
assembly
Brush holder
complete
Fig. 11
Motor sectionGear assembly
Pinion gear
Compression spring Leaf spring
Projection

P 5 / 7
Repair
[3] -2. Gear Assembly and Motor Section (cont.)
ASSEMBLING
Fig. 14
Housing L
rib
The flat portion of Brush holder complete must be at 90 degrees
to the edge surface of Housing L.
flat portion of Brush holder comp.
edge surface of
Housing L
Housing L
Brush holder complete
projection
5) Assemble the unit of the Gear section and the Motor section as illustrated in Fig. 14.
notch
With the projection on Housing L
fit in the notch on Yoke,
put Yoke unit between the ribs
on Housing L.
F/R change lever
Switch
Housing L
Yoke
put the projection on Switch between
the prongs of F/R change lever.
Projection
Prong
Assembling F/R change lever to Switch
Brush holder comp.
Assembling Brush holder complete to Housing L
90 degrees

P 6 / 7
Repair
[3] -2. Gear Assembly and Motor Section (cont.)
ASSEMBLING
Fig. 15
6) Assemble Housing R to Housing L. (Fig. 7)
7) Install Carbon brush. (Fig. 15)
8) Mount Rear cover.
[Correct] [Wrong]
Lead wire of Carbon brush
Lead wire correctly routed
Torsion spring
tail of Torsion spring
tail of Torsion spring
Route the lead wire of
Carbon brush through this
outside slot in Brush holder.
The lead wire routed wrong may
interfere the tail of Torsion spring.
Brush holders viewed from A
A
Circuit diagram
Color index of lead wires' sheath
Black
Red
Orange
Blue
Brush holder complete
Terminal
Light
circuit
Connector
Connector
LED
Switch
White
Yellow
Heat sink
FET

P 7 / 7
Wiring diagram
rib A
Lead wire holder
LED
FET
Heat sink
Fix the three lead wires of FET
(black, blue, yellow from left to
right) with the lead wire holders
on switch.
[1] Lead Wires of Light Circuit
[2] Lead Wires of Switch, Brush Holder Complete and FET
Lead wires (red, black) to LED
Fix the lead wires (red, black)
to LED with the lead
wire holders.
Terminal side
Switch side
With the lead wire (orange) to Connector
positioned on the Terminal installation side,
fix Light circuit with the holder.
Light circuit
Lead wire
(orange)
Light circuit
Connector of Light circuit
rib B Do not cross the lead wires (red, black)
to LED in the circled portion.
Holder
Connect the Connecting terminals
to Switch as illustrated below.
Connecting
terminal
approx. 20 degrees
Connecting terminal
on the lead wire from
Brush holder complete
Connector of Switch
Be careful not to route
lead wires on the inlaid
edge of Housing L in
the circled portion.
Between the rib and Light circuit,
route the three lead wires
(blue, red, black) connected to the
Connector of Switch.
Connect the Connector of
Light circuit with that of Switch.
Then fix them in these holders.
Be sure to fix all the lead wires
on each Connector by routing
through the slits in the holder.
Route the lead wires (red, black) to LED
between the rib A and the rib B.
Note:
1. Make sure that the wires are tight
in the circled portion.
2. Be careful not to route over the rib.
rib
Terminal
Switch