Makita BTW074 Manual

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CONCEPT AND MAIN APPLICATIONS
PRODUCT
Models No.
Description
BTW074, BTW104
Cordless Impact Wrench
(The image above is Model BTW074.)
W
H
L
Dimensions: mm (")
Width (W)
Height (H)
Length (L)
74 (2-15/16)
144 (5-5/8)*1
216 (8-1/2)*1/ 234 (9-1/4)*2
*1149mm (5-7/8”) for Anti-deflection anvil version
*2with 1.5Ah Li-ion battery BL1415NA
*3with 3.0Ah Li-ion battery of BL1430A
TECHNICAL INFORMATION
Specification
Standard equipment
No
Optional accessories
Li-ion Battery BL1415NA
Li-ion Battery BL1415NAP
Li-ion Battery BL1430A
Li-ion Battery BL1430AP
Battery protector
Charger DC18SD
Charger DC24SC
Automotive charger DC18SE
Fast charger DC18RA (for USA, Canada, Guam, Panama, Mexico, Colombia)
Fast charger DC18RC (for all countries except the countries above)
Protectors (blue/ white/ red)
Automatic refreshing adapter ADP03
Battery
No load speed: min.ˉ¹=rpm
Impacts per min.: min.ˉ¹=ipm
Max. fastening torque: N.m [kgf·cm] (in.lbs)
Charging time (approx.): min.
Capacities
Automatic battery shut-off system
Weight according to
EPTA-Procedure 01/2003*7: kg (lbs)
Battery fuel gauge*6
Capacity: Ah
Cell
Voltage: V 14.4
0 - 2,500 0 - 2,700
0 - 3,500
65 [660] (575)*495 [970] (841)*5
Standard bolt
High tensile bolt
Driving shank
M5 - M12 (3/16 - 1/2")
M5 - M10 (3/16 - 3/8")
Yes
Yes
Yes
Yes
Yes
Yes
Electric brake
Reverse switch
Variable speed control by trigger
LED job light
1.5/ 3.0
Energy capacity: Wh 22/ 44
Li-ion
1.1/ 1.3
(2.4/ 2.9)
BTW074 BTW104
140 150
15/ 22 with DC18RC
9.5mm (3/8") Square drive
Max output (W)
Model No.
*4 The fastening torque at 3 seconds after seating, when fastening M10 (grade 10.9) high tensile bolt.
*5 The fastening torque at 3 seconds after seating, when fastening M12 (grade 10.9) high tensile bolt.
*6 located on battery BL1415NA/ BL1415NAP/ BL1430A/ BL1430AP, not on the tool body
*7 with battery
These cordless impact wrenches for manufacturing industry as
the successors of BTW072 series models.
Their main features are:
•Extra compact design with a short overall length of 144mm (5-5/8")*1
•Powered by our new 14.4V Li-ion batteries with battery fuel gauge:
BL1415NA (1.5Ah)/ BL1415NP (1.5Ah)/
BL1430A (3.0Ah)/ BL1430AP (3.0Ah)
•Automatic impact stop system to avoid under-tightening and
over-tightening
• Torque stabilization system to stabilize the torque of each fastening
•Automatic battery shut-off system to avoid incomplete fastenings

Code No. Description Use for
1R004 Retaining Ring S Pliers disassembling / assembling Ring spring 7
1R045 Gear extractor disassembling / assembling Hammer section
1R222
1R288
Socket Adapter
Screwdriver magnetizer removing Steel ball 5.6 from Spindle
securing Ring spring 7
Repair
[1] NECESSARY REPAIRING TOOLS
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
[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. Description
Anvil Drum portion which is accepted by Needle bearing 1412 mounted in
Hammer case complete
Spindle
Steel ball 3.5 (24 pcs.) Whole portion
Whole portion
(a) Tip portion which is inserted into 14 Anvil
(b) in the hole where Spur gear 16 engages with Armature’s gear
Steel ball 5.6 (2 pcs.)
AmountPortion to lubricate
approx. 2 g
a little
a little
a little
a little
14
16
20
25
Fig. 1
Internal gear 39
Internal gear case
Yoke unit
29
20
25
14
16
Cup washer 14
Compression spring 26
Washer 24
Ring spring 7
Hammer
Hammer case
Spur gear 16
(2pcs.)
(a)
(b)
P 2/ 15

Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Note for Assembly/Disassembly
The models can be distinguished depending on the max. fastening torque. See Fig. 2.
When repairing the products, be sure to assemble Hammer, Compression spring and Switch plate complete or
Cover complete as shown in Fig.2.
Model No.Max. fastening torque Distinctive Parts
BTW073
BTW074
BTW103
BTW104
65 N.m
95 N.m
BTD063: Cover complete
(white)
BTD064: Switch plate complete
(white)
BTD103: Cover complete
(red)
BTD104: Switch plate complete
(red)
Compression spring
(orange)
Compression spring
(green)
ø39
ID plate
(white)
ID plate
(red)
Hammer B
Hammer C
Fig. 2
P 3/ 15

Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Armature
(1) Remove Armature section from Housing set as drawn in Fig. 3, and remove Brush holder from Armature in Fig. 4.
Fig. 3
Fig. 4
DISASSEMBLING
Carbon brush
Carbon
Brush
Armature
Yoke unit
Brush holder
Notch
Notch
Torsion
Spring
Carbon
Brush
Carbon
Brush
Tail of
Torsion spring
Tail of
Torsion Spring
1. Shift the tail of Torsion spring
from the top of Carbon brush to
the notch of Brush holder.
Then, Carbon brush is free from
the pressure of Torsion spring.
2. Take out Carbon brushes.
Then, disassemble
Armature and Yoke unit
from Brush holder.
1. Loosen four M4x22 Pan head screws and separate
Hammer case complete from Housing set.
2. Loosen two M3x12 Pan head screws and
separate Rear cover from Housing set.
3. Loosen seven M3x20 Pan head screws and
separate Housing set (R) from Housing set (L).
4. Take out Brush holder and Motor section
(Armature and Yoke unit) together with
Internal gear case from Housing set (L).
M3x20
Pan head screw
(7 pcs.)
M3x12
Pan head screw
Housing set (R)
Rear cover
Brush holder Internal gear case
Motor section
Housing set (L)
M4x22
Pan head screw
(4 pcs.)
Hammer case
complete
Hammer case complete
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Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Armature (cont.)
(1) Insert Armature into Yoke unit so as not to damage the wiring of Armature and not to be pinched your fingers
between yoke unit and Armature fan. And insert the drive end of Armature into Internal gear case as drawn in Fig. 6.
(2) Assemble Motor section (Armature, Yoke unit ), Internal gear case and Brush holder as drawn in Fig. 7.
Fig. 6
Fig. 7
ASSEMBLING
DISASSEMBLING
1. Hold Yoke unit on workbench and
slowly insert Armature into Yoke unit
until the drive end reaches workbench.
2. When the drive end
of Armature reaches
worktable, lift up Yoke
unit slowly.
Notch
3. Insert the drive end of Armature
into Internal gear case. And insert
the commutator end of Armature
into Brush holder.
Internal gear case
Yoke unit
Brush holder
Fig. 5
Armature
Yoke unit
Internal gear case
Motor section
Notch of
Yoke unit
Housing set (L)
Brush holder
Assemble Internal gear case, Yoke unit, Armature and Brush holder to Housing set (L) by the following points.
* setting the slip stopper of Internal gear case to the box portion of Housing set (L)
* setting the notch of Yoke unit to the projection of Housing set
(2) Remove Armature as drawn in Fig. 5.
1. Remove Internal gear case
from Motor section.
2. Remove Armature
from Yoke unit.
Note: Set Yoke unit with its Notch
facing to the workbench side.
Motor section
Projection for
Notch of Yoke unit
Box portion for Slip
stopper of Internal gear case
Slip stopper of
Internal gear case
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Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Armature (cont.)
(3) Assemble Motor section (Armature, Yoke unit ), Internal gear case and Brush holder to Housing set (L) as drawn
in Fig. 8.
Fig. 8
Fig. 9
Fig. 10
ASSEMBLING
Rib
90°
Yoke unit
Mark
Housing Set (L)
(5) Assemble F/R change lever as drawn in Fig. 10.
(6) Be sure to assemble ID plate and Cover complete or Switch plate complete to Housing set (L) in accordance with
[3] -1. Note for Assembly/Disassembly and the drawings in Fig. 2. And then, assemble Housing set (R).
(4) Mount Pig tails and Spacers as drawn in Fig. 9.
2. Assemble Switch with F/R change lever
to Housing set (L).
Prong portion of
F/R change lever
Projection
of Switch
Pig tails
Note: Make sure that the loosening of
Pig tail is within 9 mm from
the edge of Brush holder.
1. Set F/R change lever to Switch with aligning
the prong portion with the projection.
projection
9mm
Spacer
2. Aligning this groove with
the projection of Brush holder,
push Spacer toward Armature
until it stops.
The flat surface of Brush
holder complete has to be
mounted perpendicularly.
The edge of Yoke unit
has to be set inside of
the rib.
The marking on Yoke
unit should be facing
upward.
1. Spacer has to be set inside
the housing wall.
P 6/ 15

Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -3. Ball bearing 6801LLB in Internal gear case
Fig. 11
DISASSEMBLING
(1) Disassemble Brush holder and Motor section together with Internal gear case as drawn in Fig. 3.
(2) Remove Internal gear case from Armature as drawn on the left in Fig. 5.
(3) Remove Ball bearing 6801LLB from Internal gear case as drawn in Fig. 11.
Tap Internal gear case on the workbench to remove Ball bearing 6801LLB from the gear case.
Ball bearing 6801LLB
Internal gear case
Note: Should be tapped perpendicularly.
P 7/ 15

[3] DISASSEMBLY/ASSEMBLY
[3] -4. Bit holder section, Anvil
Fig. 12
DISASSEMBLING
(1) Loosen four M4x22 Pan head screws and separate Hammer case complete from Housing set.
See the drawing on the upper left in Fig. 3.
(2) Remove Ring spring 7 as drawn in Fig. 12. And then, remove Anvil as drawn in Fig. 13.
*For Anvil without Ring spring 7, Anvil can be removed as drawn in Fig. 13 skipping Fig. 12.
Fig. 13
(1) Pass Anvil through Nylon Washer 14 and mount them to Hammer case complete. Refer to Fig. 13.
*For Anvil without Ring spring 7, Hammer case section can be assembled to Housing set. Refer to Fig. 3.
(2) To stabilize Anvil in the position where Ring spring 7 can be assembled easily, set Hammer case complete
on 1R232. Refer to the drawing on the left in Fig. 12.
(3) Assemble Ring spring 7 as drawn in Fig. 14.
Anvil and Nylon washer 14 are removed from
Hammer case complete.
Anvil
Nylon Washer 14
Hammer Case Complete
1R232
Ring spring 7
Use 1R232 for stabilizing Anvil in the position
where Ring spring 7 can be removed easily.
Remove Ring spring 7 with 1R004.
Ring spring 7
1R004
Anvil
Anvil
1. Aligning the cut of Ring
spring 7 with the groove
on Anvil, push the opposite
side of the cut portion
with pliers.
2. The mounted Ring
spring 7 is widened
by just fitting it.
So fasten it with pliers
as shown below.
1R222
9.5 mm
3. For final adjustment, repeatedly
attach and detach a 9.5 mm square
socket such as 1R222 to/from Anvil
to fit Ring spring 7 into the groove
on Anvil.
Ring spring 7
Fig. 14
ASSEMBLING
Repair
P 8/ 15

[3] DISASSEMBLY/ASSEMBLY
[3] -5. Hammer section
Fig. 15
Fig. 16
DISASSEMBLING
(1) Loosen four M4x22 Pan head screws and separate Hammer case complete from Housing set.
See the drawing on the upper left in Fig. 3.
(2) Remove Hammer section from Housing set. See Fig. 15.
(3) Take out Steel ball 5.6 with 1R045 as drawn in Fig. 16.
Hammer section
2. Hold Hammer section as shown below in Fig. 16R,
and then release it from 1R045.
Caution: Do not hold Hammer section as shown below
in Fig. 16F when releasing Hammer section
from 1R045. Failure to follow this instruction
could cause Steel balls 3.5 to fall out from it.
Fig. 16R Fig. 16F
1. Pull Hammer downwards using 1R045
to align the opening for Steel ball insertion
with the top of the cam grooving on Spindle,
and then remove Steel balls 5.6 from Spindle.
Top of
Cam groove
on Spindle
Spindle
Steel Ball 5.6
(2pcs.)
Hammer
1R045
Handle
Opening for
Steel ball
insertion
Repair
P 9/ 15

[3] DISASSEMBLY/ASSEMBLY
[3] -5. Hammer section (cont.)
Fig. 17
Fig. 18
DISASSEMBLING
ASSEMBLING
Hammer and Steel balls 3.5,
viewed from above
(4) Disassemble Hammer section as drawn in Fig. 17.
Assemble Hammer section by reversing the disassembly procedure. (Refer to Fig. 17)
Note for Assembling:
Before putting Flat washer 24 in Hammer, make sure that twenty-four Steel balls 3.5 are put in the groove of Hammer
as shown in Fig. 18.
There will appear a space equivalent to
one Steel ball 3.5 in the groove of Hammer
when twenty-four Steel balls 3.5 are put
in place.
Hammer
Hammer
Flat washer 24
Cup washer 14
Compression spring 26
Spindle
Steel ball 3.5 (24 pcs.)
Repair
P 10/ 15

Circuit diagram
Fig. D-1
Wiring diagram
Yellow
Brush holder complete
Brush holder
Line filter*
*Line filter is not used for some countries.
Switch
LED Circuit
LED
Connector
Terminal
Connector
Color index of lead wires' sheath
Black
Red
Fig. D-2
Wiring to M1 Terminal of Switch Wiring to M2 Terminal of Switch
Viewed from
Housing set (L) side
Viewed from
Housing set (R) side
Viewed from
Rear side
M1 M1 M2
M1
30°±5º
M2
BTW073, BTW103
(without Automatic Impact Stop System)
BTW073, BTW103
(without Automatic Impact Stop System)
2. Bend the Terminal 90º
toward M2 Terminal side
so that Line filter can be
placed on Switch.
1. Secure Insulated terminal to
M1 Terminal with a screw
as shown below.
Secure Insulated terminal to M2 Terminal
tilting approx. 30º±5º as shown below.
P 11/ 15

Wiring diagram
Fig. D-3
Wiring of LED Lead Wires (before setting Switch)
Wiring in Housing set (L) (after setting Switch)
LED
Rib A
Rib B
Rib D
Lead wire holder A
Connectors in
Connector box B
Connectors can be also routed
through Connector box B.
In this case, Lead wires
have to be secured with Lead
wire holder B.
Note for Wiring:
If Line filter interferes with Housing set (R)
in assembling, check that Insulated terminal
is tilted enough to save the space for Line
filter referring to Fig. D-2.
Rib C
Connectors in Connector Box A
Lead wire
holder B
Rib F
LED
Boss
Rib E
Switch
Line filter
Route Lead wires connected to Switch
between Boss and the inner wall of
Housing set (L).
BTW073, BTW103
(without Automatic Impact Stop System)
Route Lead wires (black, red) between
Rib A and the inner wall of Housing set (L).
Route lead wires (black, red) between Rib A
and Rib B so that they are not pinched
with Switch.
If Connectors are put in Connector box A, route
Lead wires (black, red) through Connector box A
and secure them with Lead wire holder A .
Route Lead wires (black, red) between Rib B
and the inner wall of Housing set (L).
Be careful not to route
any Lead wires on this Rib.
Place Line filter between Rib E and Rib F.
P 12/ 15

Circuit diagram
Fig. D-4
Wiring diagram
Fig. D-5
BTW074, BTW104
(equipped with Automatic Impact Stop System)
Yellow
Brush holder complete
Brush holder
Line filter*
*Line filter is not used for some countries.
Switch
LED Light
Circuit
LED Circuit
Impact finish
indicator lamp
Controller
Connector
(6 pin)
Connector
(4 pin)
Terminal
Color index of lead wires' sheath
Black
Blue Red
BTW074, BTW104
(equipped with Automatic Impact Stop System)
Green
Gray White
Orange
Wiring to M1 Terminal of Switch Wiring to M2 Terminal of Switch
Viewed from
Housing set (L) side
Viewed from
Housing set (R) side
Viewed from
Rear side
M1 M1 M2
M1
30°±5º
M2
2. Bend the Terminal 90º
toward M2 Terminal side
so that Line filter can be
placed on Switch.
1. Secure Insulated terminal to
M1 Terminal with a screw
as shown below.
Secure Insulated terminal to M2 Terminal
tilting approx. 30º±5º as shown below.
P 13/ 15

Fig. D-6
Wiring diagram
BTW074, BTW104
(equipped with Automatic Impact Stop System)
Rib F
LED
Boss
Rib A
Rib B
Rib D
Rib C
Connector box
Rib F
LED
Boss
Rib A
Rib B
Rib D
Rib C
Connector
(4 pin)
Route Lead wires (blue, red and gray)
of Impact finish indicator lamp and
the connecting Lead wire (black)
between Rib C and Rib D.
Impact finish indicator lamp
Route Lead wires (black, red) between
Rib A and the inner wall of Housing set (L).
Route lead wires (black, red) between
Rib A and Rib B so that they are not pinched
with Switch.
Route the bundle of Lead wires (blue,
black, red and gray) between Rib A
and the inner wall of Housing set (L).
Route the bundle of Lead wires (blue,
black, red and gray) between Rib B
and the inner wall of Housing set (L).
Route Lead wires (black, red) between Rib B
and the inner wall of Housing set (L).
Route Lead wires (black, red) between
the following Ribs.
* Rib of the Boss for Screw hole
* Rib of the Connector box
Connector (6 pin) for
connecting to Switch
Connector (4 pin) for
connecting to Impact
finish indicator lamp
Secure Lead wires of both Connectors
(4 pin) with Lead wire holders.
Connector (6 pin) for
connecting to Switch
Wiring of Lead wires for LED (before setting Switch)
Wiring of Lead wires for Impact finish indicator lamp (before setting Switch)
P 14/ 15

Fig. D-7
BTW074, BTW104
(equipped with Automatic Impact Stop System)
Line filter
Route Line filter
between Ribs E and F.
Wiring in Housing set (L) (after setting Switch)
Rib F
LED light
Switch
Rib E
Route Lead wires for connecting
to Switch between Boss and
the inner wall of Housing set (L).
Boss
Be careful not to route
any Lead wires on this Rib.
Route Lead wires of
Impact finish indicator
lamp between the Ribs.
Secure lead wires of
both Connectors (6 pin)
with Lead wire holders.
Impact finish indicator lamp Note for Wiring:
If Line filter interferes with Housing set (R)
in assembling, check that Insulated terminal
is tilted enough to save the space for Line
filter referring to Fig. D-5.
Be careful not to route
any Lead wires on this Rib.
Wiring diagram
P 15/ 15