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6991D-TE


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T     ECHNICAL INFORMATION
   Models No.                 6991D, 6992D
                                                                                                                              PRODUCT
                                                                                                                                P1/5
                                                                                                                    L
    Description               9.6V Cordless Impact Wrench

CONCEPTION AND MAIN APPLICATIONS
   These models are 9.6V cordless impact wrenches with more compact
   and light weight body comparing with Mod.6909D,                                             H
   but their fastening torques are more powerful than the existing.
   Model 6991D is 9.5mm (3/8") square drive type and
   Model 6992D is 12.7mm (1/2") square drive type.
   The variations of these models are as listed below.

                                         Battery
   Model No.                    No.       Type    Ah       Q'ty Charger
                                                                                                                  W
   6991, 6992DWA              9122               2.0       1 pc.
                                         Ni-Cd
   6991, 6992DWAE             9122               2.0       2 pc.                                     Dimensions : mm ( " )
   6991, 6992DWD              9134               2.6       1 pc. DC1411                    Model No.     6991D        6992D
   6991, 6992DWDE             9134       Ni-MH 2.6         2 pc.                           Width ( W )   77 (3)      77 (3)
   6991, 6992DWF              9135               3.0        1 pc.                          Height ( H ) 231 (9-1/8) 231 (9-1/8)
   6991, 6992DWFE             9135               3.0        2 pc.                          Length ( L ) 168 (6-5/8) 176 (6-15/16)




 Specification
   Model No.                                              6991D                       6992D
   Voltage (V)                                                          D/C 9.6 V
   No load speed (min-1=rpm)                                            0 - 2,300
   Impact per minute (min-1=bpm)                                        0 - 3,000
                                                   100N.m (1,020Kgf.cm, 880in.lbs)
   Max.fastening torque
                                                  (when fastening high tensile bolt M12 for 3 sec.)
   Driving shank : mm ( " )                         9.5 ( 3/8 ) Square          12.7 ( 1/2 ) Square
                                                              M8 - M14 (5/16" - 9/16")
   Capacities Standard bolt
              High tensile bolt                               M6 - M10 (1/4" - 3/8")
   Net weight: kg (lbs)                               1.3 (2.9 lbs)              1.4 (3.1 lbs)




 Standard equipment
   * Battery Cover ...................................................... 1 pc.
   * Socket 19 - 38 with 12.7mm square drive ........... 1 pc. for Model 6992D (except North American market)
   * O ring 24 .............................................................. 1 pc. for Model 6992D (except North American market)
   * Plastic carrying case ............................................. 1 pc.
   < Note > The standard equipment for the tool shown may differ from country to country.

 Optional      accessories
   * Various socket ( only 12.7 mm square drive)                    * Charger DC1411
   * Set plate for battery without push button                      * Charger DC1801
   * Battery 9133                                                   * Automotive charger DC1422
   * Battery 9134
   * Battery 9135
   * Battery 9100
   * Battery 9102
   * Battery 9102A
   * Battery 9120
   * Battery 9122
Features    and benefits                                                                                            P2/5
 Model 6991D : 9.5mm (3/8") square drive type
 Model 6992D : 12.7mm (1/2") square drive type

 The lightest weight in each class
  Model 6991D : 1.3 Kg (including any of battery 9122, 9134 or 9135)
  Model 6992D : 1.4 Kg (including any of battery 9122 or 9135)


                                               More compactly designed body
                                               Refer to the comparisons listed
                                               below.
                                                                                         Newly designed D28 type motor
  9.5mm square drive                                                                     with the following features
  for Mod. 6991D                                                                         * more compact and light weight
                                                                                         * Externally accessible brush
                                                                                         * Replaceable armature
 12.7mm square drive                                                                     * Effective cooling
 for Mod. 6992D

                    Magnesium alloyed                                               Push Button for Reversing
                    hammer case.

             Easily operateable variable                                             Palm-fitly, Soft Grip
             speed control switch

           Set plate (optional accessory)
           can be attached
           for the battery without
           push button.                                                      High capacity battery 9135 with 3.0Ah
                                                                             can be used.
Comparison       of products

  9.5mm (3/8") square drive type models
           Manufacturer                                               MAKITA
 Specification   Model No.                  6991D                      6909D                           6907D
 Square drive : mm ( " )                    9.5 (3/8)                   9.5 (3/8)                       9.5 (3/8)
  No load speed : (min -1= rpm)             0 - 2,300                   0 - 2,200                      0 - 2,000
  Blows per min : (min -1= bpm).            0 - 3,000                   0 - 2,800                      0 - 2,600
 Equipped motor                             D28-15                      D31- 16                        RS750
 Max. fastening torque (N.m)                   100                        88                             69
 Externally accessible brush                  Yes                         Yes                           No
 Overall length : mm                          168 (6-5/8)                170 (6-11/16)                 185 (7-9/32)
 Net weight :Kg (lbs )                      1.3 (2.9)                   1.4 (3.1)                      1.3 (2.9)


  12.7mm (1/2") square drive type models
           Manufacturer                      MAKITA                 Competitor A
 Specification   Model No.                  6992D                     Model A-1
  Square drive : mm ( " )                   12.7 (1/2)                 12.7 (1/2)
  No load speed : (min -1= rpm)              0 - 2,300                   0 - 2,200
  Blows per min : (min -1= bpm).             0 - 3,000                   0 - 2,900
  Equipped motor                            D28-15
 Max. fastening torque (N.m)                   100                        98
 Externally accessible brush                  Yes                        Yes
  Overall length : mm ( " )                 176 (6-59/64)              181 (7-1/8)
 Net weight :Kg (lbs )                      1.4 (3.1)                   1.6 (3.6)
Repair                                                                                                  P3/5
 < 1 > Removing housing R and L
      Remove hammer case from housing R and L.
      And then, housing R and L can be removed.


 < 2 > Removing 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 steel ball 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
                                              L
                                                                 (4) Spur gear 22
       L= 85mm
       L=105mm
       L=130mm

                                              W
                    W: The maximum opening width
                      is 170mm.


                                                           Fig. 1

         (4) Apply MAKITA grease N No.2 to the position No. 1, 2,
            3 and 4, when assembling.                                                     (1) Spindle
            (1) Spindle : 0.5g           (3) Opening for
             (2) Hammer : 0.5g               steel ball inserting
                                                                                                (2) Hammer
            (3) Opening for                       Steel ball 3.5 x 25
                steel ball inserting : 0.5g
            (4) Spur gear 22 : 2.0g




                                                                                           (4) Spur gear 22

                                                                              Fig. 2
Repair                                                                                                       P4/5

< 3 > Removing ball bearing 6901LLB

                                          Internal gear case




                                                                                          Ball bearing 6901LLB




         Give a shock by knocking internal gear case                 Ball bearing 6901LLB can be removed
         on the working table.                                       from internal gear case by the shock.
                                                           Fig. 3



< 4 > Fastening torque for tapping screws
       Tapping screws Fastened position    Fastening torque: N.m (Kgf.cm)
        4 x 18         Housing set (R & L) 1.27 - 1.76 (13 - 18)
        4 x 25        *Hammer case          1.76 - 2.16 (18 - 22)
        3x8            FET Spacer           1.1 - 1.5   (11 - 15)
      < Note > Hammer case has to be fastened diagonally as illustrated in Fig. 4, when assembling.



                                                 Hammer case




                                 Fig. 4




Circuit    diagram



                                                                     FET
                                                                     (Field Effect Transistor)

                                                               Red

                  Brush holder

                                                                        M2      M1
                                               Black


                                                                          Switch
Wiring     diagram                                                                                         P5/5
 Pass the lead wires as illustrated in Fig.5.


                                                FET
                                                (Field Effect Transistor)

                                                                    Lead wire (Black) to be
                                                                    connected to switch has to be passed
                                                                    under the lead wire (Red).
                                                                             Lead wire (Red) to be
                                                                             connected to switch




                                                             Rib
                             FET lead wires




                                                   Fig.5



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