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BTW151-TE


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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



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