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T ECHNICAL INFORMATION
Models No. BTW121
NEW TOOL
P1/9
L
Description Cordless Impact Wrench
CONCEPTION AND MAIN APPLICATIONS
The above model is the advanced version of the existing
Model BTW120, and With the Automatic Blow-Stop
System featuring Model BTW121 you are free from the
H
over-tightening.
W
Dimensions : mm ( " )
Length ( L ) 176 (6-15/16)
Height ( H ) 251 (9-7/8)
Width ( W ) 75 (2-15/16)
Specification
Voltage (V) 12
No load speed (min-1=rpm) 0 - 2,300
Impact per minute (min-1=bpm) 0 - 3,000
Driving shank : mm ( " ) 12.7 (1/2) square
Standard bolt M8 - M14 (5/16 - 9/16)
Capacities
High Tensile bolt M6 - M12 (1/4 - 1/2)
Max. fastening torque 120N.m (1,220Kgf.cm, 88ft.lbs
Electric brake Yes
Reverse switch Yes
1.5 (3.3)
Net weight: kg (lbs)
including battery BH1220
Standard equipment
* Socket 19 - 38 .......................................... 1 pc.
* Pin 4 ........................................................ 1 pc.
* O ring 24 ................................................. 1 pc. (Except North American countries)
< Note > The standard equipment for the tool shown may differ from country to country.
Optional accessories
* Various sockets
* Protector
* Battery BH1220
* Battery BH1233
* Charger DC14SA
Features and benefits P2/9
Automatic Blow-Stop System
for prevention of over tightening
The machine is to be stopped automatically
in accordance with the pre-set blowing
Rubber protector (optional accessory)
time.
can be installed for protecting work piece
from the accidental scratch.
The required fastening torque (N.m) can not be
set with bpm. pre-selection system.
(Rubber protector)
BPM. pre-setting dial
Automatic blow-stop system
The machine is stopped automatically in accordance with
the pre-set blowing time. F 0 1 9
0 1
E
2
B C D
3 4 5 6
8
2
7
3
A
7 8 9 6 4
5
< Note >
The required fastening torque (N.m) can not be set
with this system.
Bottom view of grip end
(View from terminal side)
How to pre-set number of blow.
BPM. pre-setting dial is located in the grip end
as illustrated above,
and it can be found easily, when the battery
is taken off. F 0 1 9
0 1
E
2
The number of blows can be set by turning the dial
B C D
8
3 4 5 6
2
(arrow) with small flat head screwdriver.
7
3
The figures mean as illustrated in Fig.A - Fig.C.
A
7 8 9 6 4
See next page. 5
The second digit The first digit
(The alphabet means
working mode for
special employment.)
Features and benefits P3/9
If you want the blowing time for 196 bpm., If you want the blowing time for 104 bpm.,
align the pre-setting dial of the second digit with 9 align the pre-setting dial of the second digit with 5
and the same of the first digit with 8 as illustrated and the same of the first digit with 2 as illustrated
in Fig.A. Namely, the time for 98 x 2 = 196 bpm. in Fig.B. Namely, the blowing time for 52 x 2 = 104 bpm.
F 0 1 9
0 1
F 0 1 0
E
2
9 1
B C D
E
8
3 4 5 6
2
2
B C D
8
3 4 5 6
2
7
3
7
3
A
7 8 9 6 4
5
A
7 8 9 6 4
5
The second digit The first digit
The second digit The first digit
Fig.A Fig.B
If you want the blowing time for more than 200 BPM.,
align the both pre-setting dials with 9 as illustrated in Fig. C.
In this case, Mod.BTW151 is used as an normal
cordless impact wrench with 0 - 3,000 bpm.
F 0 1 9
0 1
E
2
B C D
8
3 4 5 6
2
7
3
A
7 8 9 6 4
5
The second digit The first digit
Fig.C
Indications and functions
the time for pre-set bpme. comes
Fastening of bolts
Mode of reverse switch
Dial pre-selection Clockwise rotation Anti-clockwise rotation Purpose
The second The first The machine stops automatically, The machine starts or stops with The fastening work
digit digit when its sensor perceives the time operation of the trigger switch. of bolts for which
for pre-set bpm which is the bpm. control is
F 0 1 9
0 1
equivalent to double of the figures required.
E
2
B C D
8
3 4 5 6
2
7
3
selected with dial.
A
7 8 9 6 4
5
0-9 1-8
The second The first The fastening work
digit digit of bolts for which
more than 200 bpm.
F 0 1 9
0 1 The machine starts or stops with is required, or
E
2
B C D
8
3 4 5 6
2
operation of the trigger switch. bpm. control is not
7
3
A
7 8 9 6 4
5
required.
9 9
The second The first The machine does not start The machine starts or stops with
digit digit in spite of operation of switch operation of the trigger switch.
trigger.
F 0 1 9
0 1
E
2
B C D
8
3 4 5 6
2
7
3
A
7 8 9 6 4
5
0 0
Features and benefits P4 /9
Indications and functions
Special purpose
Mode of reverse switch
Pre-setting dial
Clockwise rotation Anti-clockwise rotation Purpose
The second The first
digit digit
If the dial of second digit is pre-set on "A", the machine
F 0 1 9
0 1
does not start in spite of pulling trigger switch.
E
2
B C D
8
3 4 5 6
2
7
3
A
7 8 9 6 4
5
A Select any of
0-9
The machine stops after the Preliminary fastening
The second The first
first blow is perceived, The machine starts or stops of bolts
digit digit
depending on the pre-set with operation of the trigger
figures of the first digit. switch.
F 0 1 9
0 1
For instance,
E
2
B C D
8
3 4 5 6
2
0 : Stop at one
7
3
A
7 8 9 6 4
1 : Stop 0.1 sec. later
5
2 : Stop 0.2 sec. later
B Select any of 9 : Stop 0.9 sec. later
0-9
The second The first The machine starts or stops Depending on the pre-set Loosening of bolts
digit digit with operation of the trigger figures of the first digit,
switch. the machine stops when its blow
F 0 1 9
0 1 is not perceived.
E
2
B C D
8
3 4 5 6
For instance,
2
7
3
0 : Stop at one
A
7 8 9 6 4
5
1 : Stop 0.1 sec. later
C Select any of 2 : Stop 0.2 sec. later
0-9 9 : Stop 0.9 sec. later
The second The first
digit digit If the dial of second digit is set on "D", the machine does not
start in spite of pulling trigger switch.
F 0 1 9
0 1
E
2
B C D
8
3 4 5 6
2
7
3
A
7 8 9 6 4
5
D Select any of
0-9
The machine does not start in The machine stops depending Checking the functions
The second The first
spite of pulling switch trigger, on the pre-set figure of mentioned below.
digit digit
but buzzers 2 sec. after pulling the first digit, after the blow For instance
F 0 1 0
switch trigger, depending on is perceived. * BPM. pre-setting dial
9 1
the preset figure of the
E
2
For instance, * Stop of motor
B C D
8
3 4 5 6
2
7
3
first digit. * Buzzer
A
7 8 9 6 4
5
For instance, 0 : stop with one blow
E Select any of 0 : one alarm of buzzer
1 : two alarms of buzzer 1 : stop with two blows
0-9 2 : stop with three blows
2 : three alarms of buzzer
9 : ten alarms of buzzer 9 : stop with ten blows
Features and benefits P5/9
The relation between bpm. and fastening torque
N.m
Fastening standard bolt Fastening high tensile bolt
(Kgf.cm) N.m (Kgf.cm)
140
(1,428)
260 (2,652)
120 240 (2,448)
(1,224)
220 (2,244)
100 200 (2,040)
(1,020)
M14 180 (1,836)
80 160 (1,632)
(816) Standard fastening
140 (1,428)
torque for M 14 M12
60 120 (1,224)
(612) M12 Standard fastening
100 (1,020) torque for M 12
Standard fastening
40 torque for M 12 80 (816) M10
(408)
60 (612) Standard fastening
M10 Standard fastening torque for M 10
20 torque for M 10 40 (408) M8
(204) Standard fastening
20 (204) torque for M 8
0 0
1 2 3 (Time: sec.) 1 2 3 4 5 6 (Time: sec.)
50 100 150 (bpm.) 50 100 150 196 250 300 (bpm.)
25 50 75 (Pre-setting 25 50 75 98 99 99 (Pre-setting
dial) dial)
Comparison of products
Model Makita
Specifications BTW121 BTW120
Cell Ni-MH Ni-MH
Type BH1220 BH1233 BH1220 BH1233
Battery
Voltage (V) 12 12
Current capacity (Ah) 2.0 3.3 2.0 3.3
Energy Capacity (Wh) 24.0 39.6 24.0 39.6
No load speed (min-1=rpm) 0 - 2,300 0 - 2,300
Impacts per minute (min-1=ipm) 0 - 3,000 0 - 3,000
Fastening torque:N.m (kgf.cm) 120 (1,530) 120 (1,530)
Length : mm ( " ) 176 (6-15/16) 176 (6-15/16)
Dimensions Width : mm ( " ) 75 (2-15/16) 75 (2-15/16)
Height : mm ( " ) 251 (9-7/8) 276 (10-7/8) 253 (10) 276 (10-7/8)
1.9 (4.2) 2.2 (4.9) 1.9 (4.2) 2.2 (4.9)
Net weight: kg (lbs)
(including battery) (including battery)
Repair P6/9
< 1 > Disassembling housing R and L
Remove hammer case from housing R and L as illustrated in Fig. 1. So, housing R can be separated from
housing L.
Anvil can be disassembled from hammer case.
< Note > When assembling anvil to hammer case, put 0.1g MAKITA grease N No.1 to the cylindric part of anvil.
Hammer case Tapping screw
4 x 18 Anvil
Tapping screw Housing R
4 x 25
Anvil
Put 0.1g MAKITA grease N No.1
Housing L to this portion.
Fastening torque for assembling
Tapping screw 4 x 25 4 pcs. 1.76 - 2.16N.m
(18 - 22Kgf.cm)
Tapping screw 4 x 18 7 pcs. 1.27- -13Kgf.cm)
(10
1.76N.m
Fig. 1
< 2 > Disassembling hammer
(1) Press down hammer with 1R045: Large gear extractor
by turning the handle.
(2)Adjust the opening for steel ball inserting to the cam groove top of spindle.
Spindle
(3)Take off 2 pcs. of steel balls 5.6 from spindle. Cam groove top
< Note > 25 steel balls 3.5 are installed in hammer. of spindle
Check the quantity when assembling.
Steel ball 5.6 x 2
1R045 Large gear extractor
Hammer
Opening for steel
ball inserting
Steel ball 3.5 x 25
Fig. 2
Repair P7/ 9
(4) Apply grease to the position No. 1, 2, 3 and 4 as listed below, when assembling.
(3) to Steel ball 5.6 x 2
(1) to Spindle
(2) to Steel ball 3.5 x 25
MAKITA
Hammer
grease N No.2
(1) 0.5g
(2) 0.5g
(3) 0.5g
(4) 2.0g
< Note > Make sure that 25 pcs.of steel (4) to Spur gear 22
balls 3.5 are assembled in hammer, Fig. 3
when assembling. Ball bearing 6901LLB
< 4 > Removing ball bearing 6901LLB
Internal gear case
Ball bearing 6901LLB
Ball bearing 6901LLB can be removed
Give a shock by knocking internal gear case from internal gear case by the shock.
on the table.
Fig. 4
< 5 > Fastening tapping screws
When hammer case is assembled to housing, tapping screws 4 x 25 When FET spacer is assembled
have to be fastened diagonally as illustrated in Fig. 5. to yoke unit, tapping screw ST3 x 8
has to be fastened with the fastening
torque 1.1 - 1.5N.m (11 - 15Kgf.cm).
See Fig. 5A.
Yoke unit
FET spacer
Fig.5
Tapping screws ST3 x 8
P8/9
Circuit diagram
G M1 M
D
S M2
FET
Lead wires of
end bell complete
Switch
Color index of lead wires
Black
Red
Yellow BPM. pre-setting
Orange dial
Blue
White
Controller
Vinyl tube binding
5 yellow lead wires and
1 blue wire
Terminal
Wiring diagram P9/9
FET
Switch
Press FET lead wires and
the wires of end bell
complete into the bottom
of housing L.
Be careful, not to pinch Place the tube protecting 6 lead wires
them with housing R. of controller, in the center of controller,
so that the tube and controller's lead
wires are not pinched by housing R.
Fix lead wires (red Controller
and white) with lead
holder.
BPM. preselecting
dial plate
Place the tube and controller's lead wires
on controller with bending them as illustrated below.
Pass lead wires connecting controller
and terminal, between the inner wall Controller
of housing and boss for the controller
fastening screw. Tube and 6 lead wires
(5 yellow and 1 blue lead wires) bent
on controller
BPM. pre-setting dial plate
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