Makita BDF446 Manual

P 1/ 10
Model No.
Description
CONCEPT AND MAIN APPLICATIONS
Specification
Dimensions: mm (")
Width (W)
Height (H)
Length (L) 192 (7-9/16)
79 (3-1/8)
251 (9-7/8)
BDF446
Cordless Driver Drill
Battery
Capacity of drill chuck: mm (")
Capacity: mm (")
Lock torque: N.m (in.lbs)
Electric brake
Variable speed control
Mechanical speed control
Reversing switch
Max. fastening
torque: N.m (in.lbs)
Torque setting
Steel
Wood
Soft joint
Hard joint
No load speed:
min-1=rpm
Cell
Voltage: V
Capacity: Ah
High
Standard equipment
Optional accessories
Note: The standard equipment for the tool
shown above may vary by country.
Fast charger DC18RC
Charger DC18SD
Charger DC24SC
Automotive Charger DC18SE
Battery BL1430
Battery BL1430A
Drill bits for wood
Drill bits for steel
Belt clip
Bit holder
+ – bit 2-45 ........ 1 pc
Belt clip ............ 1 pc
Weight according to
EPTA-Procedure 01/2003*2: kg (lbs)
Low
Max output: W
Li-ion
Charging time (approx.):
min.
22
with DC18RC
14.4
3.0
Yes
Yes
Yes (2 speed)
Yes
Yes
1.7 (3.7)
13 (1/2)
38 (1-1/2)
16 stages + drill mode
Clutch torque setting: N.m (in.lbs) 1.0 - 5.0 (9 - 44)
45 (400)
30 (270)
44 (390)
0 - 1,500
0 - 400
1.5 (1/16) - 13 (1/2)
250
Model BDF446 is the upgraded version of model BDF442, featuring:
• More compact and lightweight design than BDF442
• More comfortable operation will be provided by redesigned ergonomic grip
• Compatible with the 14.4V Li-ion batteries equipped with the Battery protection circuit
designed to protect the battery from damages due to overdischarge, high temperature
or overload current
Note: This product is not compatible with 14.4V-1.3Ah battery BL1415.
This product is available in the following variations.
All models also include the accessories listed below in "Standard equipment".
Housing
color
BDF446RFE
(---) DC18RC
Model No. Type Quantity Charger Plastic
carrying case
Battery
cover
Yes
Yes
2
Battery
BDF446RFE3
BL1430 DC18RC Yes
BDF446RF
BL1430
1
1
3 2
0
No NoNoNo No
BDF446Z
(---)
Makita blue
Makita blue
Makita blue
BL1430 DC18RC
Makita blue
whiteBDF446RFW
PRODUCT
LED job light
W
L
H
*2 with Battery BL1430
TECHNICAL INFORMATION
OFFICIAL USE
for ASC & Sales Shop

P 2/ 10
Repair
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
[1] NECESSARY REPAIRING TOOLS
[2] LUBRICATIONS
[3] DISASSEMBLY/ASSEMBLY
[3]-1. Drill Chuck
Code No. Description Use for
Hex Wrench 10 removing / mounting Drill chuck
1R359
DISASSEMBLING
It is not required to lubricate the gear section because the portion is replaced as a factory-lubricated gear unit.
Drill chuck removing tool (Use this tool if Drill chuck cannot be removed by the method
described in “ [3]-1. Drill chuck disassembling”.)
(1) Set Machine and Repairing tools. (Figs. 1, 2, 3)
CORRECT WRONG
Fig. 3
Fig. 1 Fig. 2
Note: Use Impact driver to unscrew
M6 x 22 Flat head screw if it
could not be removed manually.
Open Keyless drill chuck fully and
remove M6 x 22 Flat head screw
by turning it clockwise.
M6 x 22 Flat head screw
F/R Change lever
Set Speed change lever
to Low speed mode
indicated by “1”.
Set Change ring
to Drill mode.
Speed change lever
Change ring
Set F/R Change lever to
Reverse (counter clockwise)
rotation.
Attach battery.
Setting of Hex wrench 10
Vise
Grip flat surfaces
of Hex wrench 10.
Hex wrench 10
Hex wrench 10,
viewed from side [A]
Vise
Grip the long end.
[A] [A]
Do not grip edges of
Hex wrench 10.
Do not grip
the short end.
Hex wrench 10,
viewed from side [A]

P 3/ 10
Repair
[3] DISASSEMBLY/ASSEMBLY
[3]-1. Drill Chuck (cont.)
DISASSEMBLING
*Note: The rotational direction is viewed from operator.
1. Grip Hex wrench 10 with Drill chuck and hold Machine.
Important:
Be sure to hold the grip of Machine tightly with sufficient
counterclockwise* force against clockwise* recoil force
of Machine.
2. Pull Switch trigger slowly.
3. Spindle rotates counterclockwise* and consequently
Drill chuck is removed from spindle.
Hex wrench 10
Counterclockwise* force
to be applied by operator
Clockwise* recoil force
of Machine
Fig. 4
(2) Remove Drill chuck. (Fig. 4)
ASSEMBLING
Fig. 5 Fig. 6
end of the threaded
portion of Spindle
Drill chuck
Turn Drill chuck clockwise until it sits on
the end of the threaded portion of Spindle.
F/R Change lever
Set Speed change lever
to Low speed mode
indicated by "1".
Set Change ring
to Drill mode.
Speed change lever
Change ring
Set F/R Change lever to
Forward (clockwise) rotation.
Attach battery.
(1) Set the machine. (Fig. 5, 6)
(2) Set Hex wrench 10 to vise and described in Fig. 3.

P 4/ 10
Repair
[3] DISASSEMBLY/ASSEMBLY
[3]-1. Drill Chuck (cont.)
ASSEMBLING
(3) Tighten Drill chuck. (Fig. 7)
Hex wrench 10
Fig. 7
M6x22 Flat head screw
4. Open Keyless drill chuck fully,
then drive M6x22 Flat head screw
by turning counterclockwise*
with Impact driver.
Counterclockwise
recoil force
of Machine
*Note: The rotational direction is viewed from operator
1. Grip Hex wrench 10 with Drill chuck and hold Machine.
Important:
Be sure to hold the grip of Machine tightly with sufficient
clockwise* force against counterclockwise* recoil force
of Machine.
2. Pull Switch trigger slowly to turn Spindle clockwise*.
3. Drill chuck is tightened and consequently Spindle is locked.
Clockwise* force to
be applied by operator Note:
Apply adhesive (ThreeBond 1321B/
1342 or Locktite 242 to threaded
portion) when re-using removed
M6x22 Flat head screw.
DISASSEMBLING
Fig. 8
[3]-2. Gear assembly and Motor section
Rear cover
1. Unscrew two 3x16 Tapping screws,
then remove Rear cover.
2. Pull Carbon brushes in the direction of the arrow
after shifting the end of each Torsion spring from
the top of Carbon brushes.
Carbon brushes
(1) First, remove Drill chuck.(Figs. 1,2,3,4)
(2) Then remove Rear cover and disconnect Carbon brushes from Armature’s Commutator
before dismantling Housing set. (Fig. 8)
Shift the end of each
Torsion spring to the
concave portion of
Brush holder.

P 5/ 10
Repair
[3] DISASSEMBLY/ASSEMBLY
[3]-2. Gear assembly and Motor section (cont.)
DISASSEMBLING
(3) Disassemble Gear assembly and Motor section. (Fig. 9)
Fig. 9
3. Unscrew nine 3x16 Tapping screws,
then remove Housing (R).
4. Remove the assembly of
Motor section and Gear section.
Housing (R)
5. Remove Speed change lever,
then separate Gear assembly
from Motor section.
6. Remove Armature along with Yoke unit
from Brush holder complete.
Speed change lever
Gear assembly
Brush holder
complete
Armature
Yoke unit
Armature
7. Pull Armature from Yoke unit.
Yoke unit
Motor section

P 6/ 10
Repair
[3] DISASSEMBLY/ASSEMBLY
[3]-2. Gear assembly and Motor section (cont.)
(4) Insert Armature into Yoke unit carefully and connect Motor section to Gear assembly. (Fig. 11)
(3) Put Leaf spring in place on the inside of Housing (L). (Fig. 10)
Fig. 11
Fig. 10
ASSEMBLING
3. Mount Speed change lever to Gear assembly. (Refer to Fig. 14)
notch
Notch must be located on Armature
drive-end as above.
[Wrong][Correct]
Note: Be careful when inserting
Armature as fingers can
be pinched and injured.
[Wrong][Correct]
Be sure to hold Commutator portion as your fingers
can be pinched by Armature fun due to strong magnetic
force toward Yoke unit.
2. Connect Motor section to
Gear assembly by engaging
Armature gear with Planetary
gears in Gear assembly.
Be sure to put Leaf spring
in place as drawn on the right.
Leaf springHousing (L)
1. Insert Commutator end
into Brush holder complete.

P 7/ 10
Repair
[3] DISASSEMBLY/ASSEMBLY
[3]-2. Gear assembly and Motor section (cont.)
ASSEMBLING
(5) Engage the notch of Yoke unit with the projection inside of Housing (L) when mounting the assembly of
Gear section and Motor section to Housing (L). (Fig. 12)
(6) Adjust the assembly of Motor section and the Gear section to the correct position in Housing (L)
so as to assemble Housing (R) to Housing (L) smoothly and exactly. (Fig. 13)
Fig. 12
Fig. 13
projection for fitting
to the notch
Engage the notch of Yoke unit with the projection inside of Housing (L).
Housing (L) notch
Yoke unit
The flat portion of Brush holder must be at
exactly 90 degrees to the edge of Housing (L).
edge of
Housing (L)
Brush holder
complete
Housing (L)
flat portion of
Brush holder
complete
90 degrees Yoke unit must be mounted
within these ribs.
This rib must be fit in
the groove of Change ring.

P 8/ 10
Repair
[3] DISASSEMBLY/ASSEMBLY
[3]-3. Speed change lever
Assemble Speed change lever to Gear assembly. (Fig. 14)
Mount F/R Change lever on Switch before assembling Housing (R) to Housing (L). (Fig. 15)
Fig. 14
Fig. 15
ASSEMBLING
1. Be sure to put two
Compression springs
on the back of
Speed change lever.
hook
2. Mount Speed change lever to
Gear assembly.
Note: Be sure to fit the hook of
Gear assembly in Speed
change lever.
Gear assembly
Low speed side
3. Set Speed change lever to either
Low speed side or High speed side.
High
speed side
Compression springs
[3]-4. F/R Change lever
F/R Change lever
projection
Engage the prong portion
with the projection of Switch.
prong portion

Circuit diagram
P / 1
Fig. D-1
White
Color index of lead wires' sheath
Black
Red
Yellow
Brush holder
complete
Switch
Terminal
Connector
FET (Field effect transistor)
LED
job light
Line filter
Line filter is not used
for some countries.

Wiring diagram
P 1/ 1
Fig. D-3
Fig. D-2
Brush holder
complete
Lead wire wiring of Brush holder complete
Switch
Terminal
boss
Connector
Line filter
Wiring in Grip portion
Fix Lead wires with these
Lead wire holders.
Place Line filter here
if it is used.
Line filter
2. Assemble Receptacles to
Lead wires.
1. Pass Lead wires of Brush holder complete
through Line filter if it is used.
Receptacle
Line filter
Line filter is not used
for some countries.
LED job light
LED Lead wires must be
tight in this area indicated
by the dotted line.
Pass Lead wires to Switch
in this area.
Do not pass between
the boss and Housing wall.