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SG1250-TE


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T     ECHNICAL INFORMATION
    Models No.                   SG1250                                                                 L-1
                                                                                                                       PRODUCT
                                                                                                                         P 1 / 11

    Description                  Wall chaser 125mm (5")
CONCEPT AND MAIN APPLICATIONS
   Are you still employing chisel, when you groove for                            H-1
   plumbing in the wall? Chisel is a past method!
                                                                                         H-2
   Grooving with model SG1250 is the new style of plumbing.
   Its features and benefits are as follows.
   * Electronic for soft start, constant rotational speed
   * SJS (Super Joint System) for avoiding the shock                                                          L-2
     by accidental wheel jam.                                                                  W
                                                                                                        Dimensions : mm ( " )
   * Precise grooving work with coaxial 2 diamond wheels
                                                                                                   Length ( L-1 ) 376 (14-3/4)
                                                                                                   Length ( L-2 ) 346 (13-5/8)
                                                                                                   Width ( W )    151 (5-15/16)
                                                                                                   Height (H-1 ) 284 (11-1/8)
                                                                                                   Height (H-2 ) 178 ( 7 )
 Specification
                                                                                Continuous Rating (W)
      Voltage (V)              Current (A)               Cycle (Hz)                                            Max. Output(W)
                                                                               Input           Output
           110                      13.0                  50 / 60               1,400            840                 1,800
           120                      12.0                  50 / 60               1,400            840                 1,800
           220                       6.7                  50 / 60               1,400            840                 2,100
           230                       6.4                  50 / 60               1,400            840                 2,100
           240                       6.1                  50 / 60               1,400            840                 2,100
    No load speed : min-1= rpm.                               9,000 ( for Europe : 10,000 )
                                                                   125 (5)
    Blade size Diameter : mm (")
                Arbor : mm (")                                     22.23 (7/8)
    Cutting depth : mm (")                                    0 - 30 (0 - 1-3/16)
                                                              6(1/4) - 30(1-3/16)
    Adjustment of
      cutting width : mm (")                                  Adjustable in 9 stage
                                                              by inserting the spacers




 Standard equipment
   * Diamond wheel 125 ......................... 2 pcs.
   * Plastic carrying case ......................... 1 pc.
   * Wrench 35 .......................................... 1 pc.
   * Hex wrench 6 .................................... 1 pc.

   < Note > The standard equipment for the tool shown may differ from country to country.
 Optional        accessories
   * Various diamond wheel cutter 125mm
   * Spacer 3mm for adjustment of cutting width
   * Spacer 6mm for adjustment of cutting width
                                                                                                                       P 2 / 11
Features     and benefits                                   SG1250
  Electronic features for
  * Soft start for suppressing shock at start                 Comfortable gripping by
  * Auto cut-off when overloading                             ergonomically designed handle
  * Speed control
                                                                                         Connectable with
  SJS (Super Joint System)
                                                                                         vacuum cleaner for
  provides the following benefits.                                                       dustless work
  * Smooth and comfortable
     cutting work
                                                                                                 Aluminum blade case,
  * Suppression of shock by reaction
                                                                                                 structured for easy replacement
     at starting
                                                                                                 of wheels, and easy adjusting
  * Protection of the mechanical section
                                                                                                 of cutting depth.
    from the shock by accidental wheel jam

  Adjustable groove width in 9 stage                                                               Conveniently located front
  by inserting spacers                                                                             cover efficiently prevents the
  of 3mm(1/8") and 6mm(1/4") in               Groove width                                         dust from spreading, in every
                                                               Q'ty of        Q'ty of              cutting depth.
  thickness.                                  inc. wheel
                                                               6mm flange     3mm flange
     Diamond                                  thickness
                                   Outer
     wheels                        flange         6mm                            1 pc.
                                                  9mm             1 pc.
   Inner
   flange                                        12mm             1 pc.          1 pc.
                                                 15mm             2 pcs.
                                                 18mm             2 pcs.         1 pc.
                                                 21mm             3 pcs.
                                                 24mm             3 pcs.         1 pc.
               Spacer       Spacer               27mm             4 pc.
               of 6mm       of 3mm                                4 pc.          1 pc.
                                                 30mm

Comparison        of products
                   Model No.          MAKITA            Competitor A                Competitor B                 MAKITA
 Specifications                       SG1250              Model A                     Model B                     SG150
 Power input : W                        1,400               1,400                      1,500                      1,800
 Rated amperage in USA : A                12                 12                         N/A                        N/A
 No load                           9,000
 speed : min-1= rpm.              10,000 (Europe)           8,200                          9,500                   5,100
 Blade diameter : mm (")               125 (5)             125 (5)                      125 (5)                   150 (6)
 Cutting depth : mm                     0 - 30             0 - 30                        8 - 30                   7 - 45
                  (")               (0 - 1-3/16)        (0 - 1-3/16)               (5/16 - 1-3/16)            (9/32 - 1-3/4)
 Possible adjustment of          6(1/4) - 30(1-3/16) 10(3/8), 17(11/16)          Stepless                    7(9/32) -
    cutting width : mm (")           in 9 stage      23(7/8), 30(1-3/16)         15 - 26 (9/16 - 1)                35(1-3/8)
 Auto cut-off carbon brush               Yes                 Yes                          Yes                      Yes
             Overload protection         Yes                 Yes                          Yes                      Yes
 Electronic
             Soft start                  Yes                 Yes                          Yes                      Yes
   for
             Speed control               Yes                 Yes                          Yes                      Yes
 Torque limiter                       Yes (SJS)              Yes                          No                        No
 Connection with vacuum cleaner           Yes                Yes                          Yes                      Yes
 Double insulation                        Yes                Yes                          Yes                      Yes
 Vibration : m/s2 (instruction manual)      less than 2.5            5              less than 2.5                (No data)
 Sound power level : dB(A)                       86                                                              (No data)
                   (instruction manual)                              92                     86
 Cord length : m (ft)                         5.0 (16.4)         4.0 (13.1)           4.0 (13.1)                  2.5 (8.2)
                 Length : mm ( " )           346 (13-5/8)      344 (13-1/2)         358 (14-1/8)               416 (16-3/8)
 Dimensions      Width : mm ( " )           151 (5-15/16)       164 (6-1/2)         267 (10-1/2)                172 (6-3/4)
                 Height : mm ( " )              178 (7)         248 (9-3/4)          165 (6-1/2)                   203 (8)
 Net               Catalogue                   4.1 (9.0)          3.9 (8.6)            3.8 (8.4)                 5.6 (12.3)
 weight : Kg (lbs) Measured                   4.13 (9.1)         4.13 (9.1)              4.14 (9.1)
Repair                                                                                                          P 3 / 11
< 1 > Lubrication
     Apply MAKITA grease SG. No.0 to the following portions designated by black triangle to protect
     parts and product from unusual abrasion.

   Position                                                                                      Amount : g
   No.            Parts item          Portion to be lubricated                                            (oz)
     (65)      Gear housing           where spiral bevel gear 35 rotates                          12 (0.42)


                                          (65)


                                       Spiral bevel
                                       gear 35


                                                 Fig. 1


< 2 > Removing spiral bevel gear 9 and armature
    ( 1 ) Remove blade case section and handle L and R from the motor section as illustrated in Fig. 2 and Fig. 3.




                      Pan head
                      screw M5x40
                                     Hex socket
                                     head bolt M5x30
                                                                 Blade case section
                                                  Fig. 2


       Tapping screw 4x18 (5 pcs.)                        Handle R                         Handle L




                                                                           Motor section


                                                 Fig. 3
Repair                                                                                                          P 4 / 11

  ( 2 ) Remove gear housing from motor housing. See Fig. 4.
  ( 3 ) Separate rear cover by unscrewing tapping screw 4x18. And remove carbon brush. See Fig. 5.
  ( 4 ) Remove armature with gear housing cover. See Fig. 6.
  ( 5 ) Remove retaining S-6 and flat washer 6 from armature shaft. See Fig. 7.
  ( 6 ) Remove spiral bevel gear 9 together with flat washer 12 by employing bearing extractor.
        Remove lock spring 12 by hand, and remove retaining ring S-12 with retaining ring plier. See Fig. 8.
  ( 7 ) Remove armature from gear housing cover with gear extractor. See Fig. 9.
        Be careful, not to lose flat washer 12 in this step.


                                                                                      Tapping screw 4x18
           Motor housing                                                                   Rear cover
                                                                                  Carbon
                                                                                  brush
    Gear housing




                                                                                                               Carbon
                                                                                                               brush


                                                                                                Fig. 5
   Tapping screw 4x28
   (4 pcs.)                            Fig. 4


                                                                                        Retaining ring S-6
                                                                                         Flat washer 6
              Armature




                                                                                             Fig. 7




   Gear housing
   cover                    Fig. 6
                                                                             No. 1R045 Gear extractor (large)

  1R269 Bearing extractor     Spiral bevel
                                                Lock spring 12
                              gear 9

                                                                                  Flat                  Armature
                                                                                  washer 12
                                                                         Gear housing
                                         Retaining ring S-12             cover
  Gripping spiral bevel gear 9     Flat washer 12
  together with flat washer 12,
  remove them from armature shaft.
                                   Fig. 8                                                         Fig. 9
Repair                                                                                                           P 5 / 11
< 3 > Mounting spiral bevel gear 9 and armature
    ( 1 ) Mount ball bearing 6001LLB to gear housing cover. See Fig. 10.
    ( 2 ) Mount flat washer 12 to the armature shaft. See Fig. 11.
   ( 3 ) Mount the armature to gear housing cover with arbor press. See Fig. 12.
   ( 4 ) Mount retaining ring S-12, lock spring 12 and flat washer 12 to the armature shaft. See Fig. 13.
   ( 5 ) Mount spiral bevel gear 9 to the armature shaft . See Fig. 14.
   ( 6 ) Mount flat washer 6 to the armature shaft. And then, secure the parts with retaining ring 6. See Fig. 15.
     < Note for replacing spiral bevel gear 9 >
     The following parts have to be replaced as a set with the fresh ones.
          * Spiral bevel gear 9
          * Lock spring 12
          * Retaining ring S-6


                           Ball bearing 6001LLB
                                                                  Flat washer 12




                                     Gear housing cover
                                Fig. 10                                                Fig. 11




                                                                    Retaining ring S-12

                                                                   *Lock spring 12
                                                                 Flat washer 12
                   Armature

                                                                                                 Fig. 13
                      Gear housing
                      cover
                                                                           Strongly push spiral bevel gear
                                                                           toward lock spring 12 side
                                                                           by hand with glove, while turning
                                                                           it clockwise.



                                                                        *Spiral
                                 1R217 Ring 22
                      Fig. 12                                            bevel gear 9


   After mounting flat washer 6, secure the
   parts mounted to the armature shaft,
   with retaining ring 6.
                                                                                             Fig. 14


       Flat washer 6
 *Retaining ring 6

      Fig. 15
Repair                                                                                                                    P 6 / 11
< 4 > Disassembling gear section
     ( 1 ) Unscrew 4 pcs. of hex socket head bolt M4x6. See Fig. 16.
     ( 2 ) Remove bearing box. See Fig. 17.
     ( 3 ) Remove spindle from helical gear 35 by pressing with arbor press. See Fig. 18.
     ( 4 ) Remove bearing retainer with No.1R316 "Adjustable Bearing Retainer Wrench". See Fig. 19.
     ( 5 ) Remove ball bearing 6201DDW. See Fig. 20.




                                                                                                      Spindle
                                                                                               Spiral bevel
                                                                                               gear 35


                                                                                               Bearing box

                                                                                                        1R217 Ring 22




                      Hex socket head
                      bolt M4x6 (4 pcs.)             Hit the illustrated position.
            Fig. 16                                  So, bearing box can be
                                                     removed, if it is difficult
                                                     to remove it by hand.
                                                                                                   Spindle
                                                                Fig. 17
                                                                                               Labyrinth ring
                                                                                                                Fig. 18

                  No.1R316
                  Adjustable bearing                                           Ball bearing
                  retainer wrench                                              6201DDW
       Bearing
       retainer




              When removing bearing retainer,
                                                                          Hit bearing box with plastic
              turn the adjustable bearing retainer
                                                                          hammer for removing ball
              wrench counter clockwise.
                                                                          bearing 6201DDW.
                         Fig. 19                                                     Fig. 20
Repair                                                                                                               P 7 / 11
< 5 > Assembling gear section
     ( 1 ) Mount ball bearing 6201DDW to bearing box. See Fig. 21.
    ( 2 ) Secure the ball bearing 6201DDW by mounting bearing retainer. See Fig. 22.
    ( 3 ) Mount labyrinth ring to spindle . See Fig. 23.
    ( 4 ) Mount spindle with labyrinth ring and spiral bevel gear 35 to bearing box as illustrated in Fig. 24.




           Ball bearing                    Bearing retainer              No.1R316                                Spindle
           6201DDW
                                                                         Adjustable bearing
                                                                         retainer wrench
                                                                                                                 Labyrinth
                                                                                                                 ring




                                            Bearing box

         Bearing box                                    When mounting bearing retainer,
                                                        turn the adjustable bearing retainer
                                                                                                                 Fig. 23
                                                        wrench clockwise.
                   Fig. 21                                    Fig. 22




                   Spindle
                                          Bearing box
         Spiral bevel gear 35




        No.1R028
        Bearing setting pipe



                                             Fig. 24
Repair                                                                                                         P 8 / 11

< 6 > Removing shoulder shaft and base
     ( 1 ) Remove retaining ring S-10 from shoulder shaft as illustrated in Fig. 25.
     ( 2 ) Remove shoulder shaft as illustrated in Fig. 26.
     ( 3 ) Now base can be removed from blade case as illustrated in Fig. 27.


                                                                     Shoulder shaft




             Retaining ring S-10

                               Fig. 25                                           Fig. 26




                                                                      Make sure that torsion spring 11 has
                                                                      been mounted to base, before mounting.
                                         Wave washer 10




           Base                                               Base                            Fig. 27A
                                    Thin washer 10
                               Fig. 27



< 7 > Mounting shoulder shaft and base
     ( 1 ) Take reverse step of the above illustrations, with paying attention to the following matters.
          * Make sure that torsion spring 11 has been mounted to base. See Fig. 27A.
          * Mount thin washers and wave washer as illustrated in Fig. 27.
Repair                                                                                                          P 9 / 11
< 8 > Mounting handle
    ( 1 ) Secure handle L to blade case with pan head screw of M5 size. See Fig. 28.
          The pan head screw of M5 size functions as a pilot screw for the step ( 3 ).
    ( 2 ) Mount motor section to the handle L. See Fig. 29.
    ( 3 ) Secure the motor section to the blade case with hex socket head bolt M5x30, while pressing the blade case
          toward the boss of bearing box. See Fig. 30 and Fig. 30A. And remove pan head screw of M5 size.
    ( 4 ) Mount handle R and secure it with the following order.
          1. Pan head screw M5x40
          2. Tapping screw 4x18 (3 pcs.) of A group
          3. Tapping screw 4x18 (2 pcs.) of B group
          See Fig. 31.


     Pan head screws
     of M5 size




                                                                                    Pan head screws
                                                                                    of M5 size
                                                                                          Fig. 30
                Fig. 28                                                                             Hex socket head
                                                                                                    bolt M5x30
                                                        Fig. 29




                                                                                         Boss
          Tapping screw 4x18
          A group




                                                                                  Bearing box


          Tapping screw 4x18                                                                                 Blade case
          B group
                                          Pan head                            While pressing blade case toward the boss
                                          screw M5x40                         of bearing box, secure blade case to bearing
                                                                              box with hex socket head bolt M5x30.
                                Fig. 31
                                                                                          Fig. 30A
Circuit   diagram                                                                                   P 10 / 11

   Color index of lead wires
  Black
  White                                                                 Brush holder
  Red                                                                   (Switch block side)
  Blue                                      SB2


                                                                  SB4
                                          Switch block

                                                            SB3
                  Power supply              SB1
                  cord




                                                Controller
                                                                   Brush holder
                                                                   (Controller side)

                                                  Fig. 32



Wiring    diagram
                                                                               Switch block



      < View from controller side >

                                                                                       Controller

      Put the lead wires of controller in the lead holder
      so that they are not slacken.




                           Speed
                           Control
                           Dial




              Be careful not to loosen the lead wires of field in motor housing.
              Put the loosened lead wires in the above place.


                                                  Fig. 33
Wiring   diagram                                                                   P 11 / 11


                                                           Switch block
                       < View from switch block side >




                                                               Controller


    Put lead wires of power                                      Do not loosen the lead
    supply cord by strain relief                                 wires of filed in motor
    as illustrated in Fig. 34.                                   housing.
                                                                 Put the loosened ones in the
                                                                 place as illustrated
                                                                  in Fig.34.




           Fix lead wires of controller
           with lead holder.

         Put the slack part of controler's lead wire
         in the place as illustrated in Fig.34.




                                                 Fig. 34



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