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T ECHNICAL INFORMATION
Models No. BTW151
L
PRODUCT
P1/8
Description 14.4V Cordless Impact Wrench
CONCEPTION AND MAIN APPLICATIONS
Because of the over-tightening, it was a problem to employ
impact wrench in the working field where the even controlled H
fastening torque is required.
However, the above mentioned BTW151 has solved this problem
with the "BPM preselection system".
Of course, BTW151 is equipped with newly developed battery
system as Model BTW150.
W
Below listed standard type model is only available.
Plastic
Model No. Battery Charger case Dimensions : mm ( " )
BTW151BSA Ni-MH Yes Length ( L ) 193 (7-5/8)
DC14SA
BH1420 / 14.4V / 2.0Ah
Height ( H ) *253 (10)
Width ( W ) 78 (3-1/16)
*253 (10) is the height with battery BH1420.
Specification
Model No. BTW151
Voltage (V) 14.4
No load speed (min-1=rpm) 0 - 2,300
Impact per minute (min-1=bpm) 0 - 3,000
Driving shank : mm ( " ) Square 12.7 (1/2)
Standard bolt M10 - M16 (3/8 - 5/8)
High Tensile bolt M8 - M12 (5/16 - 1/2)
Machine screw
Capacities
Self drilling screw
Course thread
Max. fastening torque 150N.m 1,530Kgf.cm 1,330in.lbs
Electric brake Yes
Variable speed control switch Yes
Reverse switch Yes
Net weight: kg (lbs) 1.9 (4.3) including battery BH1420
Standard equipment
* Socket 19-38 ................................... 1 pc.
* Pin 4 ................................................ 1 pc.
* O ring 24 ......................................... 1 pc. (Except North American market)
* Plastic case ....................................... 1 pc. (only for Model BTW151BSA)
< Note > The standard equipment for the tool shown may differ from country to country.
Optional accessories
* Various socket
* Battery BH1420 (2.0Ah)
* Battery BH1433 (3.3Ah)
* Charger DC14SA
Features and benefits P2/8
Model BTW151
Compact overall length : only 193 mm Only 1.9 Kg (4.3 lbs) including battery
BH1420
193m
m
Long life DC motor with the
following features
12.7mm (1/2") square drive * 2 ball bearings
* Replaceable armature
Sturdy Aluminum * Externally accessible brush
hammer case
Palm fitly soft and slim grip with
ergonomically shape for comfortable
Variable speed control switch
gripping
Push button for reversing
Bumper to protect the Newly developed 24V Ni-MH batteries
surface of materials
from scratch (BH1420 / 2.0 Ah and BH1433 / 3.3 Ah)
can be used for Mod.BTW151.
BPM. pre-selection system
The machine stops automatically, when the equipped 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
bpm. sensor perceives the pre-selected bpm.
And the over tightening can be avoided with
BPM. pre-selection system.
Consequently, Mod.BTW151 is suitable for fastening work
in the section where the fastening torque is directed in advance.
Bottom view of grip end
(View from terminal side)
BPM. pre-select dial
How to pre-select BPM.
BPM. pre-select 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
BPM. can be set by turning the dial
B C D
8
3 4 5 6
2
with flat head screwdriver so that the dial's arrow
7
3
align with the numbers or alphabet indicated on the
A
7 8 9 6 4
machine's body. 5
The figures mean as illustrated in Fig.A - Fig.C.
See next page.
The second digit The first digit
(The alphabet means
working mode for
special employment.)
Features and benefits P3/8
If you want 196 bpm., align the pre-setting dial of the second If you want 104 bpm., align the pre-setting dial
digit with 9 and the same of the first digit with 8 as illustrated of the second digit with 5 and the same of
in Fig.A. Namely, 98 x 2 = 196 bpm. the first digit with 2 as illustrated
in Fig.B. Namely, 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 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 driver 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
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 operation of the trigger switch. of bolts for which
pre-selected 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 /8
Indications and functions
Special purpose
Mode of reverse switch
Dial pre-selection Clockwise rotation Anti-clockwise rotation Purpose
The second The first
digit digit
If the dial of second digit is set on "A", the machine does not
F 0 1 9
0 1
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-selected 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-selected 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-selected figure of mentioned below.
digit digit
but buzzers 2 sec. after pulling the first digit, after the the blow For instance
F 0 1 0
switch trigger, depending on is perceived. * BPM. pre-select dial
9 1
the pre-selected 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 P5/8
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 M16 240 (2,448)
(1,224) Standard fastening 220 (2,244)
torque for M 16
100 200 (2,040)
(1,020)
180 (1,836)
80 M14 160 (1,632)
(816) Standard fastening
140 (1,428)
torque for M 14 M12
60 120 (1,224)
(612) Standard fastening
M12 100 (1,020) torque for M 12
Standard fastening
40 torque for M 12 80 (816)
M10
(408)
60 (612) Standard fastening
M8 torque for M 10
20 Standard fastening 40 (408)
(204) torque for M 10 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 (Dial pre- 25 50 75 98 99 99 (Dial pre-
selection) selection)
Comparison of products
Model Makita
Specifications BTW151 BTW150 * 6931D
Cell Ni-MH Ni-MH Ni-Cd
Type BH1420 BH1433 BH1420 BH1433 * 1402
Battery Voltage (V) 14.4 14.4 14.4
Current capacity (Ah) 2.0 3.3 2.0 3.3 4.0
Energy Capacity (Wh) 28.8 47.5 28.8 47.5 57.6
No load speed (min-1=rpm) 0 - 2,300 0 - 2,300 0 - 1,900
Impacts per minute (min-1=ipm) 0 - 3,000 0 - 3,000 0 - 2,300
Fastening torque:N.m (kgf.cm) 150 (1,530) 150 (1,530) 147 (1,500)
Length : mm ( " ) 193 (7-5/8) 193 (7-5/8) * 225(7-5/8)
Dimensions Width : mm ( " ) 78 (3-1/16) 78 (3-1/16) * 60(3-1/16)
Height : mm ( " ) 253 (10) 276 (10-7/8) 253 (10) 276 (10-7/8) * 235(10)
1.9 (4.2) 2.2 (4.9) 1.9 (4.2) 2.2 (4.9) 4.2 (9.3)
Net weight: kg (lbs)
(including battery) (including battery) (including battery)
* 6931D : The power source is a shoulder slug type battery, to which Mod.6931D is connected with cable.
Repair P6/8
< 1 > Disassembling housing R and L
Remove hammer case from housing R and L. 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.
< 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. 1
(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 Molybdenum
Hammer
grease N No.1 di-sulphide lubricant
(1) 0.5g 0.2g
(2) 0.5g
(3) 0.6g
(4) 1.0g 0.2g
< 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
Repair P7/8
< 4 > Removing ball bearing 6901LLB
Ball bearing 6901LLB is firmly assembled by pressing into internal gear case, and it is difficult to disassemble it
without any tool. For disassembling it, the following repairing tools are required.
* Bearing pullers No. 1R130 - 133
* Bearing Extractor No.1R089
(1) Bearing Puller
1R130~1R133
Initially, Slit is closed.
Bearing Extractor No.1R089 (3) (2)
(3)
Insert Bearing Puller (1) Hammer
into the inner wheel of Bearing (2).
Turn Shaft (3), it will go in, Grip
then the Slit is opened,
and the Bearing Puller (1) catches Bearing (2).
Hammer Internal gear case
Bearing Puller
Ball Bearing 6901LLB
Grip
Hit Grip strongly with Hammer,
the Bearing is pulled out by the shock.
Circuit diagram
G M1 M
D
S M2
FET
Lead wires of
end bell complete
Switch
Color index of lead wires
Black
Red
Yellow
Orange
Blue
White
Controller
Vinyl tube binding
5 yellow lead wires and
1 blue wire
Terminal
Wiring diagram P8/8
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
(6 yellow and 1 blue lead wires) bent
on controller
BPM. preselecting
dial plate