ECHNICAL INFORMATION
PRODUCT
T
P 1/ 12
Model No.
Description
BDF448
14.4V Cordless Driver Drill
L
CONCEPT AND MAIN APPLICATIONS
Model BDF448 is a successor model of BDF444, featuring:
• Extremely compact tool size with an overall length of 225mm (8-7/8") -
the shortest in its class
• High power and productivity achieved with new DC motor (FD31-30)
• Enhanced dust and drip-proof performance to ensure reliable operation
even under bad weather.
H
• Equipped with Battery fuel gauge for increased maneuverability.
Note: This product is not compatible with 14.4V-1.3Ah battery BL1415.
W
This product is available in the following variations.
Plastic
Dimensions: mm (")
Battery
Battery
cover
Housing
Systainer
case
Charger
carrying
Model No.
color
Type Quantity
case
Length (L) 225 (8-7/8)
BDF448Z
BDF448RFE BL1430
BDF448RFE3 BL1430
BDF448ZX
BDF448RFX BL1430
No
No
2
3
No
2
No
1
2
No
1
No
No
Yes
Yes
No
No
No
No
No
Yes
Yes
Width (W)
79 (3-1/8)
DC18RC
DC18RC
No
Height (H) 259 (10-1/4)
Makita
blue
No
DC18RC
Specification
Voltage: V
14.4
Capacity: Ah
Battery Energy capacity: Wh
3.0
44
Cell
Li-ion
22 with DC18RC
0 - 1,800
0 - 350
1.5 (1/16) - 13 (1/2)
13 (1/2)
Charging time (approx.): min.
High
Low
No load speed:
minˉ¹=rpm
Capacity of drill chuck: mm (")
Steel
Capacity: mm (")
Wood
Torque setting
65 (2-9/16)
21 stage + drill mode
Clutch torque setting: N.m (in.lbs)
Max lock torque: N.m (in.lbs)
1.0 - 10.0 (9 - 89)
67 (590)
43 (380)
77 (680)
Yes
Soft joint
Hard joint
Max fastening
torque: N.m (in.lbs)
Electric brake
Mechanical speed control
Variable speed control
Yes (2 speed)
Yes
Reversing switch
LED job light
Yes
Yes
Weight according to
EPTA-Procedure 01/2003*: kg (lbs)
2.2 (4.8)
* with Battery BL1430
Standard equipment
+ – bit 2-45 ................ 2
Bit holder .................. 1
Belt clip ..................... 1
Grip assembly ............ 1
Note: The standard equipment for the tool shown above may vary by country.
Optional accessories
Fast charger DC18RA
Charger DC18SD
Battery protectors
Drill bits for wood
(for US, Canada, Guam, Panama, Mexico and Colombia) Charger DC24SC
Fast charger DC18RC
Automotive charger DC18SE Drill bits for steel
Battery BL1430
(for all countries except the countries above)
Driver bits
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P 2/ 12
Repair
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
[1] NECESSARY REPAIRING TOOLS
Code No.
Description
Use for
(Use this tool if Drill chuck cannot be removed by the method of
described in “[3]-1 Drill chuck disassembling”.)
removing/ mounting Drill chuck
1R359 Drill chuck removing tool
Hex wrench 10
[2] LUBRICATION
It is not required to lubricate the gear section because the portion is replaced as a factory-assembled gear unit.
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Drill Chuck
DISASSEMBLING
(1) Remove M6x22 Flat head screw as drawn in Fig. 1.
(2) Preset the machine as drawn in Fig. 2. And set Hex wrench 10 to Vise as drawn in Fig. 3.
(3) Gripping Hex wrench 10 with Drill chuck firmly, remove Drill chuck as drawn in Fig. 4.
Fig. 1
Fig. 2
Set Change ring
to Drill mode.
Change ring
Speed change lever
Set Speed change lever
to Low speed mode
designated with 1.
Open Drill chuck fully and remove M6x22
Flat head screw by turning it clockwise.
Note: Use Impact driver to unscrew
M6x22 Flat head screw if it
could not be removed
manually.
F/R change lever
Set F/R Change lever
to Reverse (counter-
clockwise) rotation.
M6x22 Flat head screw (Left handed thread)
Attach Battery.
Fig. 3
CORRECT
WRONG
Hold the long end.
Hex wrench 10
Grip flat surfaces
of Hex wrench 10.
Do not hold edges
of Hex wrench 10.
Do not hold
the short end.
Vise
Setting of
Hex wrench
10
[A]
[A]
Hex wrench 10,
Hex wrench 10,
viewed from side [A]
viewed from side [A]
Vise
Fig. 4
Counterclockwise
Counterclockwise* force to be applied by operator
Clockwise
*Note: The rotational direction is viewed from operator.
1. Hold Hex wrench 10 with Drill chuck and grip Machine.
Important:
Grip Machine tightly with both hands to provide
the sufficient counterclockwise* force against clockwise*
recoil force of Machine.
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
Vise
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P 3/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Drill Chuck (cont.)
ASSEMBLING
(1) Set the machine. (Fig. 5 and 6)
(2) Set Hex wrench 10 to vise and described in Fig. 3.
(3) Set Drill chuck in place. (Fig. 7)
Fig. 6
Fig. 5
Turn Drill chuck clockwise by hand until
it sits on the end of the threaded portion
of Spindle.
Set Speed change lever to Low speed
mode designated with 1.
Set F/R Change lever
to Forward (clockwise)
rotation.
Speed change lever
Set Change ring to Drill mode.
Change ring
Drill chuck
F/R change lever
Attach Battery.
End of the threaded
portion of Spindle
Fig. 7
*Note: The rotational direction is viewed from operator.
1. Hold Hex wrench 10 with Drill chuck and grip Machine.
Important: Grip Machine hard with both hands to provide
sufficient clockwise* force against
counterclockwise* recoil force of Machine.
2. Pull Switch trigger slowly to turn Spindle clockwise*.
Note: Pull the Trigger so that Spindle’s rotating reaches full
speed in one second.
Clockwise* force to be
applied by operator
3. Drill chuck is tightened and consequently Spindle is locked.
4. Open Drill chuck fully, and tighten Drill chuck
with M6x22 Flat head screw by turning it
counterclockwise with Impact driver.
Counterclockwise
Counterclockwise recoil
force of Machine
Clockwise
Hex wrench 10
M6x22 Flat head screw
(Left handed thread)
Note: Apply adhesive (ThreeBond 1321B/1342 or Loctite 242)
to threaded portion when re-using the removed M6x22
Flat head screw.
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P 4/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Gear Assembly, Motor Section
DISASSEMBLING
After removing Drill chuck (Re: Figs. 1, 2, 3 and 4), disassemble Motor section and Gear assembly. (Figs. 8 and 9)
Fig. 8
1. Remove two 3x16 Tapping screws and Rear cover.
And remove four 4x18 Tapping screws.
2. Remove Housing R, unscrewing
seven 3x16 Tapping screws.
3x16 Tapping screw (7 pcs.)
Rear cover
3x16 Tapping
screw (2 pcs.)
4x18 Tapping
screw (4 pcs.)
3. Pull out Heat sink section, and remove Gear assembly
together with Motor section and Speed change lever.
4. Remove Speed change lever and Motor section
from Gear assembly.
Motor section
Speed change lever
Motor section
Speed change
lever assembly
Gear assembly
Heat sink
section
6. Lifting up Motor side of Speed change lever assembly,
pull it toward the direction designated with arrow.
5. Push Speed change lever assembly toward Motor side
until it stops to have space between the pin on the lever
of Gear assembly and rear Compression spring 4.
Motor side
Drill chuck side
Drill chuck side
Motor side
rear
Compression
spring 4
Pin on
the lever of
Gear assembly
Space between rear Compression spring 4
and the pin on the lever of Gear assembly.
front Compression spring 4 compressed
by the lever of Gear assembly
Fig. 9
5. Shift the tail of Torsion spring from top of Carbon 6. From Armature, pull off Brush holder complete and Yoke unit.
brush to the Notch of Brush holder. Carbon brush
gets free from the pressure of Torsion spring.
Yoke unit
Armature
Carbon brush
Torsion spring
Brush holder complete
Note: Pay attention not to pinch your finger between Yoke unit and Armature when removing.
Do not scratch the copper wires of Armature. Yoke unit draws Armature by its considerable
strong magnet force.
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P 5/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Gear Assembly, Motor Section (cont.)
ASSEMBLING
(1) Assemble Motor section taking the reverse step of Disassembling. Refer to Fig. 9.
Insert Armature into Yoke unit as drawn in Fig. 10.
Fig. 10
[Correct]
[Wrong]
Yoke unit has to be assembled to Armature so that its notch is located
on the drive-end side.
Note in Assembling:
1. Do not pinch your finger between Armature fan and Yoke unit.
2. Insert Armature into Yoke unit carefully so that its wire does not
damage.
Notch
(2) Assemble Brush holder complete to Commutator end of Armature. Refer to the drawings in Fig. 9.
Carbon brushes in Brush holder complete have to be still left from Armature’s commutator in this step.
(3) Fasten Heat sink with Pan head screw to Yoke unit. And insert the Motor section into Gear assembly, while engaging
Armature’s gear with the Planet gears in Gear assembly. Refer to the center right drawing in Fig. 8.
(4) Before mounting Speed change lever assembly, make sure that Lead springs and Compression springs are assembled
to Speed change lever assembly. See Fig. 11.
Fig. 11
Compression
spring 4 ( 2 pcs.)
Leaf spring ( 2 pcs.)
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P 6/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Gear Assembly, Motor Section
ASSEMBLING
(5) Assemble Speed change lever assembly as drawn in Fig. 12.
Fig. 12
front Compression spring 4
Pin on the lever
of Gear assembly
1. Apply the front Compression
spring 4 of Speed change lever
assembly to the flat side
(without pin) of Gear assembly
for Speed change.
Drill chuck
side
Motor side
2. Push Speed change lever assembly
toward Motor side until it stops to
have space between pin of Gear
assembly and rear Compression
spring 4.
rear Compression
spring 4
Drill chuck
side
Motor side
Space between rear Compression spring 4
and pin on the lever of Gear assembly
front Compression spring 4
compressed by the lever of
Gear assembly.
3. Fit the pin of Gear assembly to
Spring’s coil with slowly
returning Speed change lever
assembly toward Drill chuck side.
Drill chuck
side
Motor side
4. Slide Speed change lever
assembly to the either position
2(High speed mode) or
Pin on the lever of Gear assembly fit to
the coil of rear Compression spring 4
1 (Low speed mode).
(6) Assemble Motor section and Gear assembly as illustrated in Figs. 13 and 14.
Fig. 13
If the Motor section does not fit to
Housing L, make sure that Yoke unit
is correctly amounted to Armature.
While aligning the notch of Yoke unit with projection of
Housing L, mount Yoke unit together with Gear ass’y
and Motor section to Housing L.
See Fig. 10.
Housing Set (L)
protrusion
Brush holder complete
Gear ass’y
notch
Yoke unit
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P 7/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Gear Assembly, Motor Section (cont.)
ASSEMBLING
(7) Make sure Brush holder complete and Yoke unit are precisely mounted to Housing R. See upper drawing in Fig. 14.
And then, mount Housing R to Housing L as drawn in Fig. 14.
Fig. 14
The flat portion of Brush holder complete must be
rib of Housing L
at 90 degrees to the edge surface of Housing L.
Yoke unit
flat portion of Brush holder complete
Attach the edge of Yoke unit
to the rib of Housing L.
edge surface of
Housing L
90 degrees
Housing L
Brush holder
complete
Brush holder complete
Gap arises between Housing R and L when Gear assembly is fastened to Housing R and L.
Holding Housing R and L with Water pump pliers at the portion by their screw holes (designated with
black triangles), fasten Gear case assembly to Housing set with 4x18 Tapping screws.
Gap
4x18 Tapping screw
Gear case assembly
Housing set (L)
Housing set (R)
Gap
Gear case assembly
Housing set (L)
Housing set (R)
4x18 Tapping screw
Note in Assembling: Be careful not to give any damage on Housing set when holding with Water pump pliers.
(8) Fasten Housing R to Housing L with seven 3x16 Tapping screws.
Refer to the upper right drawing in Fig. 8.
(9) Contact Carbon brush with Armature’s commutator, putting Torsion spring on the Carbon brush.
Refer to the left drawing in Fig. 9.
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P 8/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -3. F/R Change Lever
Fig. 15
ASSEMBLING
Prong
Put the projection on Switch between the prongs of F/R change lever. (Fig. 15)
Projection
[3] -4. Switch plate complete
Fig. 16
ASSEMBLING
Housing R side
Insert Switch plate complete to Housing L,
facing its symbol of Fuel gauge to
Housing R side.
Set Switch plate complete
in place. (Fig. 16)
Switch plate
complete
Note: Switch plate complete with
faced in the wrong direction
can not be inserted to
Housing L
Housing L.
Symbol of
Fuel gauge
[3] -5. Parts related to Drip-proof structure
ASSEMBLING
Assemble Sponge B to Housing L. And assemble Seal and Sponge A to Housing L as drawn in Fig. 17.
Fig. 17
Assemble Sponge B to Housing R
to the portion designated with
gray color.
Note: To assure Drop-proof, use new Sponge A and Sponge B.
Assemble Sponge A to Seal.
Assemble the Seal to
Note: Edge of the assembled Sponge A
has to be flat to the surface of Seal.
Housing L as drawn below.
Sponge B
Housing R
Housing L
Sponge A
Seal
[3]-6. Cushion
Fig. 18R
Fig. 18F
ASSEMBLING
[Correct]
[Wrong]
Be sure to install Cushion into
Housing set (L) as drawn in Fig. 18R.
Note: Fig. 18F is the wrong installation.
Pay attention to the direction.
Housing set (L)
Cushion
Housing set (L)
Cushion
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P 9/ 12
Circuit diagram
Fig. D-1
Circuit with Battery fuel gauge
available for the countries
other than North American countries
Color index of lead wires' sheath
Yellow
Blue
Black
Red
LED
Brush holder
complete
FET
Red Lead wire is used
for some countries
instead of white.
Switch
Light
circuit
Terminal
Wiring diagram
Fig. D-2
Fig. D-3
Wiring of LED Lead Wires
(before setting Switch)
Wiring to Terminal
The Flag connector has to be connected so that
its wire connecting portion is located over
the mark of + - poles.
Fix LED lead wires with Lead wire holders
drawn below.
Wire connecting
portion
LED
Lead wire
holder
Their lead wires must
be tight between Lead
wire holders so that
Switch can be set in
place.
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P 10/ 12
Wiring diagram
Fig. D-4
Wiring to Switch
Connect the Lead wires to Switch, tilting their
Fix the FET Lead wires as follows:
yellow with Lead wire holder nearest to Switch trigger
blue with the center Lead wire holder
black with Lead wire holder farthest from Switch trigger
Connectors to 45 degrees as drawn below.
45 degrees
FET
yellow
black
blue
Lead wire
holder
FET
Switch trigger
Fig. D-5
with Battery fuel gauge available for the countries
other than North American countries
Wiring in Housing L
Brush holder complete
Put Pigtail of Carbon brush
in the area marked with gray
color to avoid pinching with
Rear cover.
9 mm
9 mm
Put Line filter in
this place.
Line filter
Pig tail of Carbon brush
Put the bundled Lead wires
into the groove of Sponge.
Seal
Pay attention, not to put
Lead wires on the Seal.
Sponge
Connector
Lead wires connected to
Connector have to be fixed
with Lead wire holders.
Light circuit
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P 11/ 12
Circuit diagram
Fig. D-1A
Circuit without Battery fuel gauge
available exclusively for North American countries
Color index of lead wires' sheath
Yellow
Blue
White
Black
Red
LED
Brush holder
complete
FET
Switch
Terminal
Wiring diagram
Fig. D-2A
Fig. D-3A
Wiring of LED Lead Wires
(before setting Switch)
Wiring to Terminal
Fix the LED lead wires
with Lead wire holders
drawn below.
The Flag connector has to be connected so
that its wire connecting portion is located
over the mark of + - poles.
Wire connecting
portion
LED
Lead wire
holder
Their lead wires must be
tight between Lead wire
holders so that Switch
can be set in place.
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P 12/ 12
Wiring diagram
Fig. D-4A
Wiring to Switch
Fix FET Lead wires as follows:
Connect Lead wires to Switch, tilting their
yellow with Lead wire holder nearest to Switch trigger
blue with the center Lead wire holder
black with Lead wire holder farthest from Switch trigger
Connectors to 45 degrees as dran below.
45 degrees
FET
yellow
black
blue
Lead wire
holder
FET
Switch trigger
Fig. D-5A
without Battery fuel gauge
available exclusively for North American countries
Wiring in Housing set (L)
Brush holder complete
Put Pigtail of Carbon brush
in the area marked with gray
color to avoid pinching with
Rear cover.
9 mm
9 mm
Pigtail of Carbon brush
Put the bundled Lead wires
into the groove of Sponge.
Seal
Pay attention not to put
Lead wires on the Seal.
Lead wires connected to
Connector have to be fixed
with Lead wire holders.
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