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6934FD-TE


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T    ECHNICAL INFORMATION
   Models No.              6934FD                                                               L
                                                                                                                    PRODUCT
                                                                                                                      P1/7

   Description             Cordless Impact Wrench

CONCEPT AND MAIN APPLICATIONS
   The above product has been developed as a 14.4V version
   of the existing model 6918D.                                                                               H
   Its features and benefits are as follows.
    * Increased amount of work with 14.4V battery.
    * Max. fastening torque : 140N.m
    * Built-in job light
   The variation of this model is as listed below.                                       W
                               Battery
    Model No.       Type No.       Cell     Q'ty    Charger
                                                                                            Dimensions : mm ( " )
    6934FDWAE 1422 (2.0Ah) Ni-Cd                                                       Length ( L )  173 (6-13/16)
                                            2 pcs. DC1414
    6934FDWDE 1434 (2.6Ah) Ni-Cd                                                       Width ( W )    94 (3-11/16)
    These 2 models come with battery cover and plastic                                 Height ( H )  238 (9-3/8)
    carrying case in addition to the above charger and battery.



 Specification
            Voltage (V)                                             14 .4
   No load speed (min-1=rpm)                                       0 - 2,300
   Impact per minute (min-1=bpm)                                   0 - 3,000
   Square drive : mm ( " )                                         12.7 (1/2)
              Standard Bolt                                  M8 - M16(5/16" - 5/8")
   Capacities High Tensile bolt                              M6 - M12(1/4" - 15/32")
   Max. fastening torque : N.m (in.lbs)                        140 (1,240)
   Electric brake                                                  Yes
   Variable switch                                                 Yes
   Reverse switch                                                  Yes
   Net weight: kg (lbs)                                            1.7 (3.7)




 Standard equipment
   * Battery cover ........................... 2 pcs.
   * Socket 19-38 .......................... 1 pc.
   * Pin 4 ........................................ 1 pc. Comes without these items for North American countries.
   * O ring 24 ................................. 1 pc.
   < Note > The standard equipment for the tool shown may differ from country to country.


   < Note > The standard equipment for the tool shown may differ from country to country.

 Optional     accessories
   * Battery 1420 (Ni-Cd 14.4V, 1.3Ah)             * Charger DC 1439
   * Battery 1422 (Ni-Cd 14.4V, 2.0Ah)             * Charger DC 1470
   * Battery 1434 (Ni-MH 14.4V, 2.6Ah)             * Charger DC 1803
   * Battery 1435 (Ni-MH 14.4V, 3.0Ah)             * Charger DC 1804
   * Charger DC 1413                               * Automotive charger CD1422
   * Charger DC 1414
Features              and benefits                                                                                   P2/7

                                                                     6934FD
                     Powerful, Max. Torque : 140 N.m                                    Compact size in this class
                                                                            173mm
                     Magnesium alloy hammer case                          (6-13/
                                                                                 16")

                                                                                                  Externally accessible
                                                                                                  carbon brush

                                                                                                  Push button for
                                                                                                  reversing

                        Built-in LED Job Light                                             Soft Grip for comfortable control
                        for shining your working
                        point in shadow                                                     D28 Type DC motor with
                                                                                            the following features.
                        Variable speed control switch                                       * Rare earth metal magnet
                                                                                            * Efficient cooling
               So long service life to fasten 100,000                                       * Externally accessible carbon
               screws or bolts.                                                               brush extends the motor life
               In case of the product of the competitor D,                                    2 times longer than
               the following troubles arise with the fastening                                the competitor's product.
               of 10,000 - 40,000 screws or bolts.                                            Furthermore MAKITA's
               * Breakage of switch by the vibration                                          replaceable armature makes
               * The end of the service life of carbon brush,                                 the tool life even beyond
                 in other words, the end of the service life                                  the motor life.
                 of DC motor itself
               * The battery falls out of the machine easily,
                 due to wear on the battery holder.



Comparison                of products
                              Model No.                          MAKITA                   Competitor A       Competitor B
    Specifications                                    6934FD            BTW150              Model G            Model H
      Voltage : V                                       14.4              14.4                14.4               14.4
   Battery




      Current capacity : Ah                             2.6               2.0                 1.7                2.4
      Energy capacity : Wh                             37.4             28.8                 24.5               34.6
      Battery cell                                    Ni-MH            Ni-MH                Ni-Cd              Ni-Cd
  Charging time : min.                             Approx. 60         Approx. 30          Approx. 45         Approx. 60
  Square drive : mm (")                               12.7 (1/2)       12.7 (1/2)          12.7 (1/2)         12.7 (1/2)
  Max. fastening torque : N.m (in.lbs)               140 (1,240)        150 (1,330)       175 (1,550)        160 (1,400)
 No load speed (min-1=rpm)                           0 - 2,300         0 - 2,300           0 - 2,400          0 - 2,200
 Impact per minute (min-1=bpm)                       0 - 3,000         0 - 3,000           0 - 3,000          0 - 2,500
 Material of hammer case                          Magnesium alloy     Aluminum          Magnesium alloy       Aluminum
 Built-in LED Job light                                 Yes             No                     No                  No
 Externally accessible brush                             Yes            Yes                    No                  No
 Soft grip                                               Yes            Yes                   Yes                 Yes
        Length : mm                                     173             193                   168                 195
                 (")                                (6-13/16)         (7-5/8)               (6-5/8)             (7-5/8)
  Dimensions




        Width : mm                                       94              78                    82                  85
                 (")                                 (3-11/16)        (3-1/16)               (3-1/4)             (3-3/8)
      Height : mm                                       238              253                  235                 243
               (")                                    (9-3/8)           (10)                (9-1/4)             (9-9/16)
 Net weight                                          1.7 (3.7)        1.9 (4.2)            1.8 (4.0)           2.0 (4.4)
                 Battery                            Yes 2 pcs.        Yes 1 ps.            Yes 2 pcs.          Yes 2 pcs.
 Standard
                 Battery cover                      Yes               No                   Yes                 Yes
 equipments
                 Charger                            Yes DC1414        Yes DC14SA           Yes                 Yes
Repair                                                                                                                 P3/7
< 1 > Lubrication
     Apply MAKITA grease N. No.2 to the following portions designated by black triangle to protect
     parts and product from unusual abrasion.

                 Hammer case                 Hammer
                          Nylon washer 14                        (23)      (28) (27) (29) (31)
                                        (21)




                                                 Fig. 1           (32)          (28)   (29)

   Position                                                                                                  Amount : g
   No.              Parts item                Portion to be lubricated                                                (oz)
    21            Anvil                        Cylindrical portion                                           0.5 (0.02)
    23            26 pcs. of Steel ball 3.5                                                                  0.5 (0.02) in total
    27            Spindle                      The cylindrical portion where (21) anvil contacts             0.5 (0.02) in total
    28            Spur gear 22                 Teeth portion                                                 2.0 (0.07)
    29            Pin 5                        Cylindrical portion                                           0.5 (0.02)
    31            Internal gear 51             The portion where (28) spur gear 22 engages.                  0.5 (0.02)


< 2 > Removing housing R and L
     Remove hammer case from housing R and L.
     And then, housing R and L can be removed.
< 3 > Disassembling hammer and spindle section
      (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.
         (3) Take off 2 pcs. of steel ball 5.6 from spindle. See Fig. 5.
         (4) Hold the hammer section as illustrated in Fig. 6. And loose the handle of large gear extractor.
            < Caution > Do not hold gear extractor as illustrated in Fig. 5, when loosening the handle of gear extractor.
                        Because, steel balls 3.5 can fall out of hammer unintentionally.




                                              Steel ball 5.6




                  Spindle
          Cam groove top
          of spindle
           Opening for steel                              Hammer
           ball inserting




                       Fig. 5
                                                                                                    Fig. 6
Repair                                                                                                          P4/7
     (5) Now hammer section can be disassembled as illustrated in Fig. 7.
     (6) After removing flat washer 24, steel balls 3.5 can be taken out from hammer. See Fig. 8.


         Spindle section                                                                             Hammer
                                               Flat washer 24
                                            Pin 5




         Cup
         washer 14

       Compression                                                                Steel ball 3.5
       spring 25                                                                  (24 pcs.)
                                     Spur gear 22
                                                                                               Flat washer 24
                                                      Spindle                            Fig. 8

         Hammer
                       Fig. 7




 < 4 > Assembling hammer and spindle section
    (1) Put 24 pcs. of steel ball 3.5 into hammer, and cover them with flat washer 24. See Fig. 9.
    (2) Mount 2 pcs. of spur gear 22 to spindle and pass 2 pcs. of pin 5 (as a gear shaft) through spindle and spur gears 22.
        Mount flat washer 24 to the spindle. Now the spindle section has been completed. See Fig. 10.
        Put compression spring 25 and cup washer 14 on the hammer. Mount the spindle section to the hammer
        as illustrated in Fig. 10.


                Flat washer 24                                             Spindle section
          Steel ball 3.5                      Pin 5    Flat washer 24
          (24 pcs.)




                                                                    Cup
                                                                    washer 14

                                                Spur gear 22
                                                                Spindle
          Hammer

                   Fig. 9                             Compression spring 25
                                                                Hammer

                                                                        Fig. 10
Repair                                                                                                       P5/7

  (4) Mount 2 pcs. of steel ball 5.6 to the cam groove top which has been aligned with the opening of hammer, wheel
     holding the large gear extractor as illustrated in Fig. 11A.

  (3) Press the hammer toward the spur gear 22 side with No.1R045 "Large Gear Extractor" in order to reserve the
      opening for mounting steel balls 5.6. See Fig. 11.

                                                            Cam groove top                  Steel ball 5.6




                                                              Opening
                                                              of hammer




                       Fig. 11                                                        Fig. 11A
Repair                                                                                                         P6/7
< 5 > Assembling the body
   (1) Mount a rubber pin 4 to housing R, and another rubber pin 4 to housing L. See Fig. 12A
   (2) When securing housing R and L with 8 pcs. of tapping screw bind PT3x16, fasten the screws with the fastening
      torque of 1.1 - 1.3N.m (11 - 13 kgf.cm).
   (3) When securing hammer case with 4 pcs. of tapping screw 4x25, fasten the screws with the fastening
      torque of 1.76 - 2.16N.m (18 - 22 kgf.cm). The 4 pcs. of tapping screw 4x25 have to be fasened diagonally.
      See Fig. 12C.
   (4) When securing FET and FET spacer with tapping screw ST3x8, fasten the screw with the fastening
      torque of 1.1 - 1.5N.m (11 - 15 kgf.cm). See Fig. 12B

      Tapping screw
                                    Tapping screw
      4x25
                                    4x25


                                        Hammer case


                                     Tapping screw
                                     4x25
      Tapping screw                                                                  Tappin screw
                              Fig.12C
      4x25                                                                           bind PT3x16
                                                                                     ( 8 pcs.)

     Tapping screw
      4x25
     (4 pcs.)                                  Hammer and spindle
                                               section


   Hammer case



                                                                                                   Housing R




         Housing L



                                                                                                Rubber pin 4, mounted
                                                                                                to housing R

                                                                                                       Fig. 12A



                                                          Rubber pin 4
                                                                                  Yoke unit
                                                                            FET spacer

                                                                                        FET
                                                      Fig. 12
                                                                            Tapping screw
                                                                            ST3x8

                                                                                        Fig. 12B
Circuit   diagram                                                                                               P7/7
       Color index of lead wires' sheath
        Black
        Red


              Endbell




                                                                              Heat shrink tube            LED circuit




                                                             M2
                                                      M1

           FET
           (Field Effect Transistor)                Switch



Wiring    diagram

                                                         Endbell




                                                                                        Internal gear case
                                                                          Yoke unit
                                                                                                             FET
                                                                                                             (Field Effect
                                                                                                             Transistor)




                                           LED circuit          Rib                                           LED circuit
                                                                               Switch




 Push the following lead wires                                                                 Put the lead wire (black),
                                                                                               connecting endbell and
 deep into the lead holders                  Put the slack portion of the following
                                                                                               switch, under the same
 as illustrated above.                       lead wires in this space.
                                                                                               lead wire (red) and pass
                                             * FET lead wires (black)
 * LED lead wire (black)                                                                       it through the space
                                             * LED lead wire (red)
 * LED lead wire (red)                                                                         between rib and FET.
                                             * LED lead wire (black)



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