Makita BHP448 Manual

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CONCEPT AND MAIN APPLICATIONS
Specification
Model No. BHP448
Description 14.4V Cordless Hammer Driver Drill
Standard equipment
Optional accessories
Note: The standard equipment for the tool shown above may vary by country.
Fast charger DC18RA
(for US, Canada, Guam, Panama, Mexico and Colombia)
Fast charger DC18RC
(for all countries except the countries above)
Battery protectors
Drill bits for wood
Drill bits for steel
Drill bits for masonry
Driver bitsCharger DC18SD
Charger DC24SC
Automotive charger DC18SE
Battery BL1430
+ – bit 2-45 ................ 2
Bit holder .................. 1
Belt clip ..................... 1
Grip assembly ............ 1
Model BHP448 is a successor model of BHP444, 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.
• Equipped with Battery fuel gauge for increased maneuverability.
This product is available in the following variations.
PRODUCT
Housing
color
BHP448RFE DC18RC
Model No. Type Quantity Charger Plastic
carrying
case
Battery
cover
Yes2
Battery
BL1430 1
No NoNoNo NoBHP448Z
Makita
blue
BHP448RFE3 DC18RC Yes
Systainer
case
No
No
BHP448RFX DC18RC No2BL1430 1 Yes
No NoNoNo NoBHP448ZX Yes
No3BL1430 2
Battery
Capacity of drill chuck: mm (")
Capacity: mm (")
Max 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:
minˉ¹=rpm
Energy capacity: Wh
Voltage: V
Capacity: Ah
High
Weight according to
EPTA-Procedure 01/2003*4: kg (lbs)
Low
44
Cell Li-ion
Charging time (approx.): min. 22 with DC18RC (DC18RA*3)
14.4
3.0
Yes
Yes
Yes (2 speeds)
Yes
Yes
2.2 (4.9)
13 (1/2)
65 (2-9/16)
21 stage + drill mode
Clutch torque setting: N.m (in.lbs) 1.0 - 10.0 (9 - 89)
67 (590)
43 (380)
77 (680)
0 - 1,800
0 - 350
1.5 (1/16) - 13 (1/2)
LED job light
TECHNICAL INFORMATION
Dimensions: mm (")
Width (W)
Height (H)
Length (L) 225 (8-7/8)
79 (3-1/8)
259 (10-1/4)
Note: This product is not compatible with 14.4V-1.3Ah battery BL1415.
Depth rod ................... 1
Masonry 14 (9/16)
Impacts per minute:
minˉ¹=ipm
High
Low
0 - 27,000
0 - 5,200
*with Battery BL1430
W
L
H

[3] DISASSEMBLY/ASSEMBLY
[3] -1. Drill Chuck
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
DISASSEMBLING
Fig. 1
M6x22 Flat head screw (Left handed thread)
(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. 2
Attach Battery.
F/R change lever
Set F/R Change lever
to Reverse (counter-
clockwise) rotation.
Set Speed change lever
to Low speed mode
designated with 1.
Speed change lever
Set Change ring
to Drill mode.
Change ring
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Repair
It is not required to lubricate the gear section because the portion is replaced as a factory-assembled gear unit.
[1] NECESSARY REPAIRING TOOLS
[2] LUBRICATION
Code No. Description Use for
1R359 Drill chuck removing tool
Hex wrench 10
(Use this tool if Drill chuck cannot be removed by the method of
described in “[3]-1 Drill chuck disassembling”.)
removing/ mounting Drill chuck
Open Drill chuck fully and remove M6x22
Flat head screw by turning it clockwise.
CORRECT WRONG
Fig. 3
Fig. 4
Setting of
Hex wrench
10
Vise
Grip flat surfaces
of Hex wrench 10.
Hex wrench 10
Hex wrench 10,
viewed from side [A]
Vise
Hold the long end.
[A]
Do not hold edges
of Hex wrench 10.
Do not hold
the short end.
Hex wrench 10,
viewed from side [A]
Note: Use Impact driver to unscrew
M6x22 Flat head screw if it
could not be removed
manually.
[A]
Clockwise
Counterclockwise
Hex wrench 10
Vise
Clockwise* recoil force
of Machine
*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.
2. Pull Switch trigger slowly.
3. Spindle rotates counterclockwise* and consequently
Drill chuck is removed from spindle.
Counterclockwise* force to be applied by operator

[3] DISASSEMBLY/ASSEMBLY
[3] -1. Drill Chuck (cont.)
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Repair
ASSEMBLING
Fig. 5
End of the threaded
portion of Spindle
Drill chuck
Fig. 6
Attach Battery.
F/R change lever
Set F/R Change lever
to Forward (clockwise)
rotation.
Set Speed change lever to Low speed
mode designated with 1.
Speed change lever
Set Change ring to Drill mode.
Change ring
Counterclockwise
Hex wrench 10
Fig. 7
Clockwise
4. Open Drill chuck fully, and tighten Drill chuck
with M6x22 Flat head screw by turning it
counterclockwise with Impact driver.
(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)
M6x22 Flat head screw
(Left handed thread)
Turn Drill chuck clockwise by hand until
it sits on the end of the threaded portion
of Spindle.
Note: Apply adhesive (ThreeBond 1321B/1342 or Loctite 242)
to threaded portion when re-using the removed M6x22
Flat head screw.
Counterclockwise recoil
force of Machine
*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.
3. Drill chuck is tightened and consequently Spindle is locked.
Clockwise* force to be
applied by operator

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Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Gear Assembly, Motor Section
DISASSEMBLING
Fig. 8
1. Remove two 3x16 Tapping screws and Rear cover.
And remove four 4x18 Tapping screws.
After removing Drill chuck (Re: Figs. 1, 2, 3and 4), disassemble Motor section and Gear assembly. (Figs. 8 and 9)
2. Remove Housing R, unscrewing
seven 3x16 Tapping screws.
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.
Gear assembly
Speed change leverMotor section Motor section
Rear cover
3x16 Tapping
screw (2 pcs.) 4x18 Tapping
screw (4 pcs.)
3x16 Tapping screw (7 pcs.)
Heat sink
section
Speed change
lever assembly
rear
Compression
spring 4
front Compression spring 4 compressed
by the lever of Gear assembly
Drill chuck sideMotor side Drill chuck side
Motor side
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.
6. Lifting up Motor side of Speed change lever assembly,
pull it toward the direction designated with arrow.
Space between rear Compression spring 4
and the pin on the lever of Gear assembly.
Pin on
the lever of
Gear assembly
Fig. 9
Torsion spring
Carbon brush
Brush holder complete
Yoke unit
Armature
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.
5. Shift the tail of Torsion spring from top of Carbon
brush to the Notch of Brush holder. Carbon brush
gets free from the pressure of Torsion spring.
6. From Armature, pull off Brush holder complete and Yoke unit.

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Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Gear Assembly, Motor Section (cont.)
ASSEMBLING
Fig. 10
(1) Assemble Motor section taking the reverse step of Disassembling. Refer to Fig. 9.
Insert Armature into Yoke unit as drawn in Fig. 10.
(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.
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.
[Wrong][Correct]
Notch
Yoke unit has to be assembled to Armature so that its notch is located
on the drive-end side.
Fig. 11
Leaf spring ( 2 pcs.) Compression
spring 4 ( 2 pcs.)

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Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Gear Assembly, Motor Section
ASSEMBLING
Fig. 12
Fig. 13
(5) Assemble Speed change lever assembly as drawn in Fig. 12.
(6) Assemble Motor section and Gear assembly as illustrated in Figs. 13 and 14.
If the Motor section does not fit to
Housing L, make sure that Yoke unit
is correctly amounted to Armature.
See Fig. 10.
Housing Set (L)
rear Compression
spring 4
front Compression spring 4
compressed by the lever of
Gear assembly.
Drill chuck
side
Motor side
Pin on the lever
of Gear assembly
Drill chuck
side
Motor side
Drill chuck
side
Motor side
front Compression spring 4
1. Apply the front Compression
spring 4 of Speed change lever
assembly to the flat side
(without pin) of Gear assembly
for Speed change.
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.
3. Fit the pin of Gear assembly to
Spring’s coil with slowly
returning Speed change lever
assembly toward Drill chuck side.
Space between rear Compression spring 4
and pin on the lever of Gear assembly
Pin on the lever of Gear assembly fit to
the coil of rear Compression spring 4
protrusion
notch Yoke unit
Brush holder complete
Gear ass’y
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.
4. Slide Speed change lever
assembly to the either position
2(High speed mode) or
1 (Low speed mode).

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Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Gear Assembly, Motor Section (cont.)
ASSEMBLING
Fig. 14
Yoke unit
Attach the edge of Yoke unit
to the rib of Housing L.
rib of Housing L
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.
Housing set (R)
Gap
Gap
Gear case assembly
Housing set (R)
Note in Assembling: Be careful not to give any damage on Housing set when holding with Water pump pliers.
Gear case assembly
The flat portion of Brush holder complete must be
at 90 degrees to the edge surface of Housing L.
flat portion of Brush holder complete
edge surface of
Housing L
Housing L
(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.
Brush holder
complete
90 degrees
(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.
Housing set (L)
Housing set (L)
4x18 Tapping screw
4x18 Tapping screw

P 8/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -3. F/R Change Lever
[3] -5. Parts related to Drip-proof structure
ASSEMBLING
Fig. 17
Assemble Sponge B to Housing L. And assemble Seal and Sponge A to Housing L as drawn in Fig. 17.
Assemble Sponge B to Housing R
to the portion designated with
gray color.
Sponge B
Sponge A
Note: To assure Drop-proof, use new Sponge A and Sponge B.
Assemble Sponge A to Seal.
Note: Edge of the assembled Sponge A
has to be flat to the surface of Seal.
Seal
Housing R Housing L
Assemble the Seal to
Housing L as drawn below.
Projection
Prong
ASSEMBLING
[3] -4. Switch plate complete
ASSEMBLING
Put the projection on Switch between the prongs of F/R change lever. (Fig. 15)
Fig. 15
Housing L
Switch plate
complete
Insert Switch plate complete to Housing L,
facing its symbol of Fuel gauge to
Housing R side.
Note: Switch plate complete with
faced in the wrong direction
can not be inserted to
Housing L. Symbol of
Fuel gauge
Housing R side
Set Switch plate complete
in place. (Fig. 16)
Fig. 16
ASSEMBLING
[3]-6. Cushion
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.
[Correct] [Wrong]
CushionHousing set (L) Housing set (L) Cushion
Fig. 18R Fig. 18F

P 9/ 12
Circuit diagram
Wiring diagram
Fig. D-1
Fig. D-2
Color index of lead wires' sheath
Black
Red Blue
Yellow
Brush holder
complete
Circuit with Battery fuel gauge
available for the countries
other than North American countries
FET
LED
Light
circuit
Switch
Red Lead wire is used
for some countries
instead of white.
Terminal
LED
Wire connecting
portion
Fix LED lead wires with Lead wire holders
drawn below.
Wiring of LED Lead Wires
(before setting Switch)
Wiring to Terminal
Lead wire
holder
Their lead wires must
be tight between Lead
wire holders so that
Switch can be set in
place.
The Flag connector has to be connected so that
its wire connecting portion is located over
the mark of + - poles.
Fig. D-3

P 10/ 12
Wiring diagram
FET
FET
Wiring to Switch
Connect the Lead wires to Switch, tilting their
Connectors to 45 degrees as drawn below.
Wiring in Housing L
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
Lead wire
holder
yellow
blue
black
Switch trigger
Fig. D-4
Fig. D-5
Line filter
Seal
Put Line filter in
this place.
Sponge
Put the bundled Lead wires
into the groove of Sponge.
Pay attention, not to put
Lead wires on the Seal.
Lead wires connected to
Connector have to be fixed
with Lead wire holders.
Connector
Light circuit
with Battery fuel gauge available for the countries
other than North American countries
45 degrees
Brush holder complete
Put Pigtail of Carbon brush
in the area marked with gray
color to avoid pinching with
Rear cover.
Pig tail of Carbon brush
9 mm 9 mm