Page 1
T
Subject
For Models
Country
ECHNICAL INFORMATION
Modification of Inner Housing Complete and Change Plate,
Addition of Stopper Plate, Compression Spring, Stop Ring E-4
HR2020, HR2021, HR2022, HR2440, HR2440F, HR2441, HR2442, HR2445, HR2450, HR2450F,
HR2450T, HR2450FT, HR2451, HR2455
All countries
69490
(Page 1 of 5)
Description
<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
The changes <1> (See page 1 to 3) and <2> (See page 4 to 5) have been implemented.
Current New
Inner housing complete
(153611-1)
Stop ring E-4
(961011-9)
Compression spring 5
(233388-5)
Steps to replace the above parts
<1>-1. Remove gear housing cover as Fig. 1.
Fig. 1
Inner housing complete
(153686-0)
Stopper plate
(345362-2)
Gear housing cover
<1>-2. Remove tool holder section.
<1>-3. Remove two M4x12 hex. socket head bolts. (Fig. 2)
Fig. 2
M4x12 hex. socket head bolts
Tool holder section
Page 2
<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
69490
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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
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
Fig. 6
View from bottom of New Inner housing complete
Makita grease RA No.1
Page 3
69490
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<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)
Bend portion
Pins of Inner housing complete
Interchangeability(I/C)
Current part New part NoteQ'tyItem No. I/CQ'ty
Inner Housing Complete
153611-1
HR2020, HR2021,
HR2022, HR2440,
HR2441, HR2442: 080
HR2440F: 081
HR2020, HR2021,
HR2022, HR2440,
HR2441, HR2442: 081
HR2440F: 082
HR2020, HR2021,
HR2022, HR2440,
HR2441, HR2442: 082
HR2440F: 083
1
Interchangeability mark ;
The arrow means that the new part can be substituted for the current.
Inner Housing Complete
153686-0
Stopper Plate
345362-2
Compression Spring 5
233388-5
Stop Ring E-4
961011-9
Stop ring E-4
(961011-9)
Compression
spring 5
(233388-5)
1049
1
Interchangeable
as a set
1
1
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
Page 4
69490
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<2> Modifications of Inner housing complete and change plate: HR2450, HR2450F, HR2450T, HR2450FT,
HR2451, HR2452, HR2455
Current New
Inner housing complete
(153610-3)
Change plate
(345220-2)
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)
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
(153687-8)
Clutch cam
Compression
spring 5
Page 5
69490
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<1>-12. Do the reverse of disassembling for Tool holder section and Gear housing cover.
Interchangeability(I/C)
Current part New part NoteQ'tyItem No. I/CQ'ty
Inner Housing Complete
153610-3
Change Plate
345220-2
Interchangeability mark ;
The arrow means that the new part can be substituted for the current.
1
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.
Inner Housing Complete
153687-8
Change Plate
345363-0
1049
Interchangeable
1082 No1
as a set
Armature shaft
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