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69490-WW-1


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TECHNICAL INFORMATION
Subject               Modification of Inner Housing Complete and Change Plate,
                                                                                                        69490
                                                                                                      (Page 1 of 5)

                      Addition of Stopper Plate, Compression Spring, Stop Ring E-4
                      HR2020, HR2021, HR2022, HR2440, HR2440F, HR2441, HR2442, HR2445, HR2450, HR2450F,
For Models
                      HR2450T, HR2450FT, HR2451, HR2455
Country               All countries

Description           The changes <1> (See page 1 to 3) and <2> (See page 4 to 5) have been implemented.

<1> Modification of Inner housing complete and addition of Compression spring 5, Stopper plate, Stop ring E-4:
    For HR2020, HR2021, HR2022, HR2440, HR2440F, HR2441, HR2442, HR2445

                      Current                                                         New
                Inner housing complete                                               Inner housing complete
                      (153611-1)                                                           (153686-0)
                                                                    Stop ring E-4
                                                                     (961011-9)




                                                            Compression spring 5     Stopper plate
                                                               (233388-5)             (345362-2)



Steps to replace the above parts
<1>-1. Remove gear housing cover as Fig. 1.
Fig. 1




 Gear housing cover                                                    Tool holder section




<1>-2. Remove tool holder section.
<1>-3. Remove two M4x12 hex. socket head bolts. (Fig. 2)
Fig. 2




                                          M4x12 hex. socket head bolts
                                                                                                           69490
                                                                                                         (Page 2 of 5)
<1>-4. Remove Shaft section and Piston cylinder as Fig. 3.
       All steps for removal of re-use parts have now been completed.
Fig. 3
                                           Shaft section     Piston cylinder




<1>-5. Remove O-ring 24 and O-ring 68 as Fig. 4.
Fig. 4


                                           O-ring 68




                             O-ring 24

<1>-6. Replace the current Inner housing complete by the new one illustrated in Fig. 5, and then apply Makita grease RA
       No.1 to the designated portion as Fig. 6.
Fig. 5                                           Fig. 6

                                                   View from bottom of New Inner housing complete




                                                                               Makita grease RA No.1
      New Inner housing complete
             (153686-0)

<1>-7. Set the current O-ring 24 and O-ring 68 to the new Inner housing complete as Fig.4.
<1>-8. Assemble the current Shaft section and Piston cylinder with the new Inner housing complete as Fig. 7,
       and screw the brand new M4x12 hex socket head bolts (2 pcs.).
Fig. 7
                                                                                                               69490
                                                                                                             (Page 3 of 5)
<1>-9. Set Stopper plate through the pins of Inner housing complete as Fig 8 while lifting the current Piston cylinder
       by fingers.
       Install Compression spring 5 and Stop ring E-4 to the pin of Inner housing complete.
Fig. 8

                         Piston cylinder                     Stopper plate
                                                             (345362-2)
                                                                                                   Stop ring E-4
                                                                                                   (961011-9)


                                                  Bend portion




                                                                                                           Compression
                                                                                                           spring 5
                                                                                                           (233388-5)
                       Pins of Inner housing complete



 Interchangeability(I/C)

         Item No.           Current part                Q'ty    I/C          New part               Q'ty       Note
                      Inner Housing Complete                          Inner Housing Complete
          049                                            1                                           1
                      153611-1                                        153686-0
HR2020, HR2021,
HR2022, HR2440,                                                       Stopper Plate
                                                                                                     1
HR2441, HR2442: 080                                                   345362-2
HR2440F: 081                                                                                               Interchangeable
HR2020, HR2021,                                                                                                 as a set
HR2022, HR2440,                                                       Compression Spring 5
                                                                                                     1
HR2441, HR2442: 081                                                   233388-5
HR2440F: 082
HR2020, HR2021,
HR2022, HR2440,                                                       Stop Ring E-4
HR2441, HR2442: 082                                                                                  1
                                                                      961011-9
HR2440F: 083
Interchangeability mark ;
The arrow      means that the new part can be substituted for the current.

 Implementation
Since Nov., 2003 production.

 Supplementary information: Check whether Flat washer 9 can be seen on the Armature shaft as Fig. 9 by removing
                            the armature from the machine. If not, put Flat washer 9 (Part No. 267271-4) as shown in
                            Fig. 9. Refer to Technical information No. 67378.
 Fig. 9

    Marking on Flat washer 29 (267271-4) should face outward.




    Armature shaft
                                                                                                          69490
                                                                                                        (Page 4 of 5)

<2> Modifications of Inner housing complete and change plate: HR2450, HR2450F, HR2450T, HR2450FT,
                                                              HR2451, HR2452, HR2455

                         Current                                                        New

   Inner housing complete                                     Inner housing complete
         (153610-3)                                                 (153687-8)




                         Change plate                                                Change plate
                          (345220-2)                                                  (345363-0)


Steps to replace the above parts
   <2>-1 Remove gear housing cover.
   <2>-2 Remove Tool holder section.
   <2>-3 Remove two M4x12 Hex. socket head bolts. (Refer to Fig. 2 of page 1.)
   <2>-4 Remove shaft portion and Piston cylinder. (Refer to Fig. 3 of page 2.)
   <2>-5 Remove Change plate.
   <2>-6 Remove O-ring 24 and O-ring 68. (Refer to Fig. 3 of page 2.)
   All steps for removal of re-use parts have now been completed.
   <2>-7. Replace the current Inner housing complete by the new one in accordance with the steps <2>-8 to 14.
   <2>-8. Apply 5g of Makita grease RA No.1 as Fig. 6 of page 2.
   <2>-9. Install O-ring 24 and O-ring 68 as Fig. 4 of page 2.
   <2>-10. Set the new Change plate to the new Inner housing complete (Fig. 10).

Fig. 10

                                                            Inner housing complete
                                                                  (153687-8)




          Change plate
           (345363-0)


   <2>-11. Fix the current Shaft section and Piston cylinder with Inner housing, and then secure them by screwing the
           new M4x12 hex socket head bolts (2 pcs.). Next, set the following parts on Pin 6 as Fig. 11.
             Stop ring E-4
             Compression spring 5
             Flat washer 5
Fig.11
                                                            This protrusion of Change plate should be inserted into
                                        Piston cylinder     the groove of Clutch cam.
                                                                                                     Stop ring E-4



                                                                                                       Flat washer 5


 Shaft section
                                        Inner housing
                                          complete                                                     Compression
                                         (153687-8)                Clutch cam                          spring 5
                                                                                                        69490
                                                                                                      (Page 5 of 5)
<1>-12. Do the reverse of disassembling for Tool holder section and Gear housing cover.

 Interchangeability(I/C)

 Item No.         Current part                Q'ty   I/C          New part                Q'ty        Note
            Inner Housing Complete                      Inner Housing Complete
   049                                          1                                          1
            153610-3                                    153687-8                                 Interchangeable
            Change Plate                                Change Plate                                  as a set
   082                                          1    No                                    1
            345220-2                                    345363-0
Interchangeability mark ;
The arrow      means that the new part can be substituted for the current.

 Implementation
Since Nov., 2003 production.

 Supplementary information: Check whether Flat washer 9 can be seen on the Armature shaft as Fig. 12 by removing
                            the armature from the machine. If not, put Flat washer 9 (Part No. 267271-4) as shown in
                            Fig. 12. Refer to Technical information No. 67378.
 Fig. 12

    Marking on Flat washer 29 (267271-4) should face outward.




    Armature shaft



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