Makita HR2450 Series User manual

04-2004
1” ROTARY HAMMER V.S.
SDS-PLUS Model HR2450 (MCC)

2 Model HR2450
Item Part No.
No. No. Used Description Item Part No. No. No. Used Description
1286263-4 1Cap 35
2233915-8 1Ring Spring 19
3417629-9 1Chuck Cover
4257241-1 1Ring 21
5345187-4 1Guide Washer
6233916-6 1Conical Comp. Spring 21-29
7921923-8 1Hex. Bolt M8X120
8417630-4 1Grip Base
9152521-9 1Grip 36 Com.
10 266069-6 4Tapping Screw 4X45
11 417794-4 1Cap
12 162229-7 1Change Lever Com.
13 213278-8 1O Ring 17
14 183441-6 1Gear Housing Set
(Includes Item 15)
15 153290-5 1Needle Bearing Com.
16 233918-2 1Ring Spring 28
17 267228-5 1Washer 30
18 233328-3 1Compression Spring 31
19 227028-5 1Spur Gear 51
20 216022-2 1Steel Ball 7.0
21 153365-0 1Tool Holder Com.
22 267229-3 1Flat Washer 28
23 213128-7 1O Ring 12
24 324396-8 1Impact Bolt (Old 324278-4)
25 324218-2 1Ring 9
26 213232-2 1O Ring 15
27 324216-6 1O Ring Case
28 213073-6 1O Ring 9
29 233917-4 1Ring Spring 28
30 324214-0 1Striker
31 213227-5 1O Ring 16
32 331632-5 1Piston Cylinder (Silver, Flat -->
Silver, Gloss)
33 267104-3 1Flat Washer 12
34 324215-8 1Piston Joint
35 267104-3 1Flat Washer 12
36 211012-0 1Ball Bearing 606ZZ
37 961003-8 1Retaining Ring S-7
38 233343-7 1Compression Spring 7
39 331634-1 1Clutch Cam
40 324248-3 1Cam Shaft
41 219014-0 1Swash Bearing 10
42 226550-9 1Helical Gear 26
43 266273-7 2Hex Socket Head Bolt M4X12
44 345179-3 1Bearing Retainer
45 267234-0 1Flat Washer 8
46 211032-4 1Ball Bearing 608ZZ
47 324212-4 1Ring 8
48 213725-9 1O Ring 68
49 *1Inner Housing Com.
50 213380-7 1O Ring 24
51 210060-6 1Ball Bearing 609LLU
52 267231-6 1Flat Washer 9
53 240047-4 1Fan 60
54 517376-3 1Armature Assy (Includes Items
51-53, 55 & 56)
55 681636-0 1Insulation Washer
56 211021-9 1Ball Bearing 607LLB
57 266052-3 2Tapping Screw 4X60
58 417631-2 1Baffle Plate
59 633491-6 1Field
60 183409-2 1Motor Housing (Includes Item 64)
62 689111-0 2Spacer
63 643988-7 1Brush Holder
64 819063-3 1Makita Label
65 191927-6 2Carbon Brush CB-407 (2pcs/Set)
66 643989-5 1Brush Holder
68 650508-0 1Switch
69 153284-0 1Handle Cover Com. (Includes
2X263002-9 -Rubber Pin 4)
70 265999-8 1Tapping Screw 4X25

3 Model HR2450
Item Part No.
No. No. Used Description Item Part No. No. No. Used Description
71 682559-5 1Cord Guard 8
72 664895-1 1Cord With Plug 2P-18-4.0M
74 687063-9 1Strain Relief
75 265995-6 2Tapping Screw 4X18
76 265999-8 2Tapping Screw 4X25
77 421494-0 1Rubber Ring 19
78 417795-2 1Lock Button
79 233341-1 1Compression Spring 3
80 226399-7 1Spur Gear 10
81 265999-8 2Tapping Screw 4X25
82 *1Change Plate
83 961017-7 2Stop Ring E-3
84 417796-0 1Guide Base
85 233344-5 2Compression Spring 4
86 961011-9 1Stop Ring E-4
87 941102-2 1Flat Washer 5
88 233342-9 1Compression Spring 6
89 163430-7 1Lock Plate Com.
90 345280-4 1Hex. Washer
91 267271-4 1Flat Washer 9 (Add) *
100 251425-3 1(-) Flat Head Screw M6X22
Accessories
A01 324219-0 1Depth Gauge
A02 417724-5 2Latch
A03 134943-5 1Grip 36 Assy (Includes Items
7-9 & 90)
A04 181573-3 1Bit Grease
A05 765009-6 1Blow-Out Bulb
A06 421342-3 1Dust Cup 5 (6-14.5mm Bit Dia.)
421664-1 1Dust Cup 9 (12-16mm Bit Dia.)
A07 763047-2 1½” Drill Chuck
A08 122573-4 1Chuck Adaptor (Includes Item 100)
A09 122574-2 1Drill Chuck Assy (Includes Items
A07 & A08)
A10 763432-9 1Chuck Key
A11 - - - - - 1Bull Point, Cold Chisel, Grooving
Chisel, Scaling Chisel
(See Catalogue for Details)
A12 - - - - - 1Core Bit (See Catalogue for
Details)
A13 181490-7 1Hammer Grease 30cc
A14 A-86642 1Core Bit Adaptor (SDS Plus)
A15 191686-A 1Makita Safety Glasses
A16 752031-2 1Center Bit
A17 256806-6 1Rod (For 25-40mm)
256815-5 1Rod (For 45-118mm)
A18 824650-5 1Plastic Carrying Case
(Includes Item A02)
SERVICE CHANGES
1. Modification of Inner Housing Com and Change Plate.
*SEE SERVICE CHANGES
Item No. Description Type 1 Type 2 Type 3
49 Inner Housing Com 153367-6 153610-3 153687-8
82 Change Plate 345220-2 345363-0
91 Flat Washer 9 - - - - - 267271-4
Implementation ~ Oct 2003 Nov 2003 ~
Above parts are completely interchangeable as a set.

4 Model HR2450
SERVICE NOTE
Follow these steps when replacing the Inner Housing Com and the Change Plate.
1. Remove Gear Housing Cover.
2. Remove Tool Holder section.
3. Remove two M4x12 Hex. Socket Head Bolts. (Fig. 1)
All steps for removal of re-use parts have now been completed.
7. Replace the current Inner Housing complete by the new one.
8. Apply 5g of Makita Grease RA No.1 as (Fig. 6)
4. Remove Shaft portion and Piston Cylinder. (Fig. 2)
6. Remove O-Ring 24 and O-Ring 68. (Fig. 4)
Fig. 1
Fig. 2
Fig. 4
Fig. 6
5. Remove Change Plate. (Fig. 3) Fig. 3

5 Model HR2450
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 (PartNo. 267271-4) as shown in (Fig 12)
9. Install O-Ring 24 and O-Ring 68 as (Fig. 4)
10. Set the new Change plate to the new Inner housing complete (Fig. 10).
Fig. 4
11. Fix The Current Shaft Section And PIston Cylinder with Inner Housing, and then secure them by screwing
the new M4x12Hex. Socket Head Bolts (2pcs). Next, Set the following parts on Pin 6 shown in Fig 11.
Fig. 11
•Stop Ring E-4
•Compression Spring 6
•Flat Washer 5
Fig. 10