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6918FD-TE


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T     ECHNICAL INFORMATION
   Models No.                       6918FD                                                                         L
                                                                                                                            PRODUCT
                                                                                                                              P1/7

   Description                      Cordless Impact Wrench

CONCEPT AND MAIN APPLICATIONS
  In addition to all the powerful features of 6918D,
  6918FD has a built-in LED job light.                                                                                        H
  ( Max. fastening torque : 120 N.m and the lightest and compact body                                       12V
  in this class, etc.).
  The variations of this model are as listed below.
    Model No.                        Battery                           Q' ty      Charger
                                                                                                             W
    6918FDWAE                 1222 Ni-Cd 2.0Ah                         2 pcs.
    6918FDWDE                 1234 Ni-MH 2.6Ah                         2 pcs.     DC1414
    6918FDWFE                 1235 Ni-MH 3.0Ah                         2 pcs.
                                                                                                         Dimensions : mm ( " )
    These 3 models come with battery cover and plastic carrying case in
                                                                                                    Length ( L ) 173 (6-13/16)
    addition to the above charger and battery.
                                                                                                    Width ( W )   94 (3-11/16)
                                                                                                    Height ( H ) 231 (9-1/8)


 Specification
              Voltage (V)                                                                     12
    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 - M14 (5/16 - 9/16)
    Capacities
                High Tensile bolt                                                         M6 - M12 (1/4 - 15/32)
    Max. fastening torque : N.m ( in.lbs)                                              120 ( 1,064 )
    Built -in LED Job Light                                                                   Yes
    Electric brake                                                                            Yes
    Variable switch                                                                           Yes
    Reverse switch                                                                            Yes
    Net weight: kg (lbs)                                                                    1.6 (3.5)


 Standard equipment
   * Socket 19 - 38 .......................................         1 pc.
   * Pin 4 ......................................................   1 pc. Comes without these items for North American countries.
   * O ring 24 ...............................................      1 pc.
   * Battery cover ..........................................       2 pcs.
   * Plastic carrying case .............................            1 pc.
   < Note > The standard equipment for the tool shown may differ from country to country.
 Optional         accessories
   * Various sockets                              * Charger DC1414
   * Battery 1220                                 * Charger DC1413
   * Battery 1222                                 * Charger DC1470
   * Battery 1234                                 * Charger DC1804
   * Battery 1235                                 * Automotive charger D1422
Features         and benefits                                                                                 P2/7
                                                                 6918FD
                 Powerful, Max. Torque : 120 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
    Specifications                               6918FD           6918D             Model B
      Voltage : V                                  12               12                12
   Battery




      Current capacity : Ah                        2.6              2.6               1.7
      Energy capacity : Wh                        31.2             31.2              20.4
      Battery cell                               Ni-MH           Ni-MH              Ni-Cd
  Charging time : min.                        Approx. 60        Approx. 60        Approx. 45
  Square drive : mm (")                          12.7 (1/2)      12.7 (1/2)        12.7 (1/2)
  Max. fastening torque : N.m (in.lbs)          120 (1,064)       120 (1,064)     158 (1,400)
 No load speed (min-1=rpm)                      0 - 2,300        0 - 2,300         0 - 2,400
 Impact per minute (min-1=bpm)                  0 - 3,000        0 - 3,000         0 - 3,000
 Material of hammer case                     Magnesium alloy   Magnesium alloy   Magnesium alloy
 Built-in LED Job light                            Yes            No                   No
 Externally accessible brush                         Yes           Yes                 No
 Soft grip                                           Yes           Yes                Yes
        Length : mm                                 173           176                 168
                 (")                            (6-13/16)      (6-15/16)            (6-5/8)
  Dimensions




        Width : mm                                   94             94                 82
                 (")                             (3-11/16)      (3-11/16)            (3-1/4)
      Height : mm                                   231            231                235
               (")                                (9-1/8)        (9-1/8)            (9-1/4)
 Net weight                                      1.6 (3.5)      1.6 (3.5)          1.7 (3.7)
                 Battery                        Yes 2 pcs.      Yes 2 psc.         Yes 2 pcs.
 Standard
                 Battery cover                  Yes             Yes                Yes
 equipments
                 Charger                        Yes DC1414      Yes DC1413         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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