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HR2450T-TE


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T        ECHNICAL INFORMATION
   Models No.                 HR2450FT, HR2450T
                                                                                                                       PRODUCT
                                                                                                                         P 1 / 24

    Description               24mm (15/16") Rotary Hammer                                               L

CONCEPTION AND MAIN APPLICATIONS
   The above models are the advanced version of MAKITA's                                                                    H
   famous 3 -mode rotary hammer HR2450.
   Each new model features :                                                           W
   HR2450T : possible to quickly change from
              the chuck for SDS-plus to keyless                 Dimensions : mm ( " )
              drill chuck mutually without any tool Model No.      HR2450FT       HR2450T
   HR2450FT : equipped with built in job light      Length ( L )         384 (15-1/8)
                in addition to HR2450T's feature
                                                    Height ( H ) 212 (8-3/8)        204 (8)
                                                    Width ( W )           72 (2-13/16)
 Specification
                                                                                Continuous Rating (W)
          Voltage (V)         Current (A)            Cycle (Hz)                                              Max. Output(W)
                                                                               Input           Output
               110                 7.5                 50 / 60                  780              370                650
               120                 6.7                 50 / 60                  780              370                650
               220                 3.7                 50 / 60                  780              370                650
               230                 3.6                 50 / 60                  780              370                650
               240                 3.4                 50 / 60                  780              370                650
    Model No.                                   HR2450FT                    HR2450T
    No load speed : (min -1= rpm)              0 - 1,100                  0 - 1,100
    Blows per min, :(bpm=min -1)               0 - 4,500                  0 - 4,500
    Single blow energy ( J )                     2.7                          2.7
    Variable switch                             Yes                           Yes
    Reverse switch                              Yes                           Yes
    Bit shank                                SDS plus type              SDS plus type
    Capacity




               Concrete : mm (")                * 24 (15/16 )               * 24 (15/16 )       * 25mm (1") for USA.
               Steel. : mm (")                    13 (1/2 )                   13 (1/2 )
           Wood : mm (")                 32 (1-1/4 )                         32 (1-1/4 )
    Protection against electric shock double insulation                double insulation
    Built in job light                     Yes                                 No
    Cord length : m ( ft )                    ** 4 (13.1)                  ** 4 (13.1)         ** 2.5m (8.2 ft) for Asia
    Net weight :Kg (lbs )                      2.6 (5.7)                    2.6 (5.7)          ** 2.0m (6.6 ft) for Australia


 Standard equipment
   * Stopper pole ........................ 1 pc. * Side grip ..................... 1 pc.
   * Quick change drill chuck ..... 1 pc.
   * Plastic carrying case ............ 1 pc.

   < Note > The standard equipment for the tool shown may differ from country to country.
 Optional            accessories
   * T.C.T hammer drill bits 5.5mm - 24mm                 * Core bits                           * Dust cups 5 and 9
                         (7/32" - 15/16")                 * Center bits                         * Safety goggle
   * Bull point 14mm (9/16")                              * Core bit adaptor                    * Bit grease
   * Cold chisel 20mm (13/16")                            * Rod                                 * Blow out bulb
   * Scaling chisels 38mm and 50mm                        * Core bits (dry type)                * Dust extractor attachment
                      (1-1/2" and 2")                     * Taper shank adaptor                 * Hammer service kit
   * Grooving chisels 8mm and 12mm                        * Taper shank T.C.T.hammer drill bits
                      (5/16" and 1/2")                    * SDS plus hammer chuck set
   * Scraper assembly                                     * SDS plus adapter
Features            and benefits                                                                                      P 2 / 24
                                                                                HR2450T, HR2450FT
     Chuck can be changed quickly without any tools.
                      "Quick Change Chuck" for SDS-plus type bit
                      is one action slide type for quick change of bits.
                                                                                   Built-in torque limiter        Palm fitting
                                                                                                                  soft grip




    "Quick Change Drill Chuck"
     Note : Use only with drill mode.

             Practical positioning
             chisel angle desired              Change lever for 3 mode settings
             40 positions                                           Rotation
             without using chisel                                      +
             adapter.                                              Percussion
                                                                                            LED Job Light
                                                                                            for HR2450FT

                                           Rotation
                                           only                        Percussion
                                                                       only

Comparison               of products
                                       Model                                 MAKITA                              Competitor A
 Specifications                                        HR2450T         HR2450FT   HR2450               HR2450F    Model A
 Power input : W                                          780                780                  780                 620
 No load speed : min-1=rpm.                             0 - 1,100          0 - 1,100            0 - 1,100            0 - 870
 Blows per min. : min-1=bpm.                            0 - 4,500          0 - 4,500            0 - 4,500           0 - 4,850
 Bit shank                                              SDS-plus           SDS-plus             SDS-plus            SDS-plus
                    Variable speed                        Yes                Yes                  Yes                  Yes
 Switch
            Reverse                              Yes             Yes                               Yes                Yes
                T.C.T. hammer bit : mm ( " ) * 24 (15/16 ) * 24 (15/16 )                      * 24 (15/16 )       24 (15/16 )
     Concrete Core bit : mm ( " )              54 (2-1/8 )    54 (2-1/8 )                       54 (2-1/8 )
  Capacity




               Diamond core bit : mm ( " )     65 (2-9/16 ) 65 (2-9/16 )                        65 (2-9/16 )     68 (2-11/16 )
     Steel : mm ( " )                         13 ( 1/2 )      13 ( 1/2 )                        13 ( 1/2 )       13 ( 1/2 )
     Wood : mm ( " )                          32 (1-1/4 )     32 (1-1/4 )                       32 (1-1/4 )      30 (1-3/16 )
                        Catalogue                2.7              2.7                               2.7                2.2
 Single bow energy : J
                        Measured                 2.7              2.7                               2.7                1.9
 Working mode                                  3 Modes        3 Modes                           3 Modes             3 Modes
 R     : Rotation                                  R              R                                R                   R
 R + P : Rotation+Percussion                     R+P            R+P                               R+P                 R+P
 P      : Percussion                               P              P                                P                    P
 Angle settings for chisel etc.                  Yes             Yes                              Yes                 Yes
 LED Job light                                    No            Yes                        No             Yes          No
 Double insulation                                Yes           Yes                               Yes                 Yes
 Cord length : m ( ft )                       ** 4 (13.1)    ** 4 (13.1)                       ** 4 (13.1)           4 (13.1)
               Length : mm ( " )             384 (15-1/8) 384 (15-1/8)                       360 (14-1/8)         385 (15-1/8)
 Dimensions Width : mm ( " )                  72 (2-13/16) 72 (2-13/16)                       72 (2-13/16)         70 (2-3/4)
              Height : mm ( " )              204 (8)        212 (8-3/8)                   204 (8)     212 (8-3/8) 205 (8-1/8)
 Net weight : kg (lbs)                         2.6 (5.7)      2.6 (5.7)                         2.4 (5.3)           2.6 (5.7)
                 * 25mm (1") for USA.
               ** 2.5m (8.2) for Asia ** 2.0m (6.6) for Australia
                                                                                                         P 3 / 24
Comparison      of products
 Numbers in chart below are relative values when setting BOSCH GBH2-24DFR 's capacity as 100.
                                                                                                          80 N
 Testing conditions
  * Materials : Concrete with compressive               Concrete with
                strength, 350Kg/cm2                     compressive strength
  * Pressure loaded to the products : 80 N              350Kg/cm2
   * Working mode : Rotation+Percussion

   Comparison in hammer drilling

    Bit diameter : 6.5mm
    MAKITA HR2450FT/T                                                                110

    Competitor A Model A                                                       100

    Competitor B Model B                                                             110

                               0                   50                   100                        150
     Bit diameter : 8.5mm

    MAKITA HR2450FT/T                                                                        125

    Competitor A Model A                                                       100

    Competitor B Model B                                              85

                               0                   50                   100                        150
     Bit diameter : 12.5mm

    MAKITA HR2450FT/T                                                                      140

    Competitor A Model A                                                       100

    Competitor B Model B                                                              115

                               0                   50                   100                        150
     Bit diameter : 20.0mm

    MAKITA HR2450FT/T                                                           110

    Competitor A Model A                                                       100

    Competitor B Model B                                        75

                               0                   50                   100                        150

  Comparison in chipping         Testing conditions
                                  * Materials : Concrete with compressive strength, 350Kg/cm2
                                  * Working mode : Percussion only * Pressure loaded to the products : 80 N

    MAKITA HR2450FT/T                                                           105

    Competitor A Model A                                                       100

                               0                   50                   100                        150
Repair                                                                                                           P 4 / 24
< 1 > Lubrication to the bit holder section
     Apply MAKITA grease to the following portions to protect parts and product from unusual abrasion.
     * MAKITA grease RA No.1 to the portions designated with black triangle.
     * MAKITA grease FA No. 2 to the portions designated with gray triangle.
     * MAKITA hammer oil to the portions with white triangle.
   Position                                                                                   MAKITA       Amount : g
   No.            Parts item        Portion to be lubricated                                  grease              (oz)
    95        Cap 35                Inner lip of bit inserting side.                                         1.0 (0.04)
    98        Stopper               The inside where (103) tool holder contacts.          MAKITA             1.0 (0.04)
    99        Steel ball 7          Whole part                                            grease RA No.1     1.0 (0.04)
    104       Steel ball 6          Whole part                                                               1.0 (0.04)
    108       Steel ball 5.0        Whole part                                                               1.0 (0.04)
                                                                                          MAKITA
    103       Tool holder           The inside where (21) tool holder guide contacts.                        1.0 (0.04)
                                                                                          grease FA No.2
                                              Quick change chuck assembly

                                                            108




                         95    96   97   98    100 101   102 99 104 103 105    106      107      109 110   111




   Position                                                                                   MAKITA       Amount : g
   No.            Parts item        Portion to be lubricated                                  grease              (oz)
     104      Steel ball 6          Whole part                                            MAKITA             1.0 (0.04)
     108      Steel ball 5.0        Whole part                                            grease RA No.1     1.0 (0.04)
                                               Quick change drill chuck assembly


                                                           108




                                                                  104    105   106      107      109 110   111
Repair                                                                                                              P 5 / 24
< 2 > Lubrication to the machine parts
      Apply MAKITA grease to the following portions to protect parts and product from unusual abrasion.
     * MAKITA grease RA No.1 to the portions designated with black triangle.
     * MAKITA grease FA No. 2 to the portions designated with gray triangle.
     * MAKITA hammer oil to the portions designated with white triangle.
     * Disulphide molybdenum alloyed grease to the portions designated with arrow.

  Position                                                                                        MAKITA           Amount
  No.            Parts item               Portion to be lubricated                                grease              : g(oz)
     12       Change lever                Top of the pins                                                        1.0 (0.04)
     13       O ring 17                   Whole portion                                                          1.0 (0.04)
                                          Inner portion for the mechanical parts                                 55 (1.91)
     14       Gear housing
                                          Groove for mounting (13) O ring 17                                     1.0 (0.04)
     15       Needle bearing               Inner ring                                                            1.0 (0.04)
     19       Spur gear 51                 Inner portion where (21) tool holder guide contacts.                  1.0 (0.04)
                                           Inner portion where (32) piston cylinder contacts.                    1.0 (0.04)
     21       Tool holder guide                                                                   MAKITA
                                           The portion where (49) inner housing contacts.                        1.0 (0.04)
                                                                                                  grease RA No.1
     23       X ring 9                     Inner hole for reciprocating (24) impact bolt.                        1.0 (0.04)
     26       O ring 15                    Whole portion                                                         1.0 (0.04)
     28       O ring 9                     Whole portion                                                         1.0 (0.04)
                                           Accepting hole for (34) piston joint                                  1.0 (0.04)
     32       Piston cylinder
                                           Inner portion where (30) striker reciprocates.                        1.0 (0.04)
                                           Convex portion of cam                                                 1.0 (0.04)

     39       Clutch cam                                                                          Disulfide molyb-
                                          Whole of groove portion                                 denum alloyed 0.5 (0.02)
                                                                                                  grease
                                          Accepting hole for (40) cam shaft                                        1.0 (0.04)
                                          The surface where (42) helical gear 26 contacts.                         1.0 (0.04)
     41       Swash bearing 10                                                                    MAKITA
                                          Convex portion of cam                                                    1.0 (0.04)
                                                                                                  grease FA No.2
                                          The portion where balls are installed                                    4.0 (0.14)
     42       Helical gear 26             Teeth portion

                                          Whole portion                                           MAKITA
     48       O ring 68                                                                                          1.0 (0.04)
                                                                                                  hammer oil XLD
                                          Teeth portion                                           MAKITA           1.0 (0.04)
     80       Spur gear 10
                                          Accepting hole for (40) cam shaft                       grease RA No.1   1.0 (0.04)




                      13              15        19        21        22 23 93          24 25 26 27        28   29
                                14
                                     30        32         34                     48
                 12




                                          80         39    40                                       49
                                                                      41      42
Repair                                                                                                           P 6 / 24
< 3 > Assembling quick change chuck
  (1) Mount torsion spring 31 by inserting pin of torsion spring 31 into the hole of tool holder and mount 2 pcs. of
      steel ball 6.0 to tool holder. See Fig. 1.

                                   Torsion spring 31

                                     Long pin of torsion spring 31

                                                   Tool holder




      Short Pin of
      torsion spring 31                                     Steel ball 6.0
                                                                                 Long Pin of
                                                                                 torsion spring 31
                   Coat the steel ball 6.0 with MAKITA grease N No.1,
                   before mounting.
                   Now the steel ball sticks on the hole of tool holder.
                                                               Fig. 1


  (2) Mount change ring to the inside of change cover while aligning the hole of change ring with the hole of
      change cover. See Fig. 2.


                          Change ring
                                                  Holes for pin of torsion spring 31




                    Change cover


                                                   Change ring
                                                                  Change cover

                                                               Fig. 2


  (3) Mount tool holder to change cover by passing the long pin of torsion spring 31 through the holes of change ring
     and change cover. And turn the tool holder approx. by 75



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