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BTW121-TE


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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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