Makita HR2452 Manual

Continuous Rating (W)
Voltage (V) Cycle (Hz) Input Output Max. Output(W)
120
110
220
230
240
Model No.
Description
PRODUCT
Current (A)
TECHNICAL INFORMATION
CONCEPT AND MAIN APPLICATIONS
Specification
Standard equipment
< Note > The standard equipment for the tool shown may differ from country to country.
P 1 / 19
HR2450, HR2451, HR2452
24mm (15/16 " ) Rotary Hammer
Dimensions : mm ( " )
Width ( W )
Height ( H )
Length ( L ) 360 (14-1/8)
204 (8)
72 (2-13/16)
W
H
L
The above models are the advanced version of MAKITA's
famous 3 -modes rotary hammer HR2400.
Each new model features :
HR2450 : with variable speed and reverse switch
HR2451 : with variable switch without reverse switch
HR2452 : with single speed switch without reverse switch
7.5
6.7
3.7
3.6
3.4
50 / 60 780 370 650
650
650
650
650
780 370
780 370
780 370
780 370
50 / 60
50 / 60
50 / 60
50 / 60
* Stopper pole ........................................... 1 pc.
* Side grip ................................................. 1 pc.
* Plastic carrying case ............................... 1 pc.
Model No. HR2450 HR2451 HR2452
Bit type
SDS max
SDS plus
SDS top
Spline
Hex
Blows per min, :(bpm=min -1)
No load speed : (min -1= rpm)
Protection from electric shock
Net weight :Kg (lbs )
Cord length : m ( ft )
Single blow energy ( J )
Variable switch
Reverse switch
Max. core bit diameter: mm (")
Max. diameter : mm (")
SDS
MAX
SDS
top
Yes Yes
Yes No
No
No
Power input : W 780
2.7 2.7 2.7
780 780
0 - 1,100 0 - 1,100 1,100
0 - 4,500 0 - 4,500 4,500
* 24 (15/16 )
* 25mm (1") for USA.
54 (2-1/8 ) * 24 (15/16 ) 54 (2-1/8 ) * 24 (15/16 ) 54 (2-1/8 )
by double insulation by double insulation by double insulation
** 4 (13.1) ** 4 (13.1) ** 4 (13.1)
2.4 (5.3) 2.4 (5.3) 2.4 (5.3)
** 2.5m (8.2) for Asia ** 2.0m (6.6) for Australia

P 2 / 19
Features and benefits
Cord guard is not
only tough but also
very flexible to
protect cable from
disconnection.
Accepting SDS-plus shank bit
Slide lock type chuck
for rapid changing bits
HR2450, HR2451, HR2452
Built-in torque limiter
Palm fitting
soft grip
Change lever for
3 mode settings
Rotation only
Rotation + Percussion
Percussion only
Lock button on change lever for
firmly holding the position of
selected mode
In-line and ergonomical designed
palm fitting soft grip
Equipped with
reverse switch
(only HR2450)
Lock ON button
Practical positioning chisel angle
desired 40 positions without using
chisel adapter

Comparison of products P 3 / 19
* HR2450
* HR2451
HR2452
780
2.7
4.0 (13.1)
3 Modes
R
R+P
P
* 0 - 1,100
Specifi-
cations
Power input : W
Bit type
Working mode
Vibration
: m / s2 Instruction manual
Measured by us
Instruction manual
Measured by us
Net weight : Kg
(lbs)
Length : mm
( " )
Width : mm
( " )
Height : mm
( " )
Dimensions
Noise
: dB(A)
Single blow energy : J
Protection from
electric shock
Cord length : m (ft)
Angle settings for chisel etc.
Steel : mm
( " )
Wood : mm
( " )
TCT.hammer bit : mm
( " )
Core bit : mm
( " )
Diamond core : mm
( " )
No load
speed: min-1=rpm.
Blows per
min. : min-1=bpm.
Capacity
Concrete
R : Rotation
P : Percussion
R + P : Rotation+Percussion
Model No. MAKITA
Variable speed+Reverse
Variable peed
Single peed
1,100
* 0 - 4,500
4,500
24
(15/16)
54
(2-1/8)
65
(2-9/16)
13
(1/2)
32
(1-1/4)
360
(14-1/8)
72
(2-13/16)
204
(8)
2.4
(5.3)
SDS-plus
Yes YesYes
9
101
101
by double
insulation
*HR2440
*HR2441
HR2442
* A-1
* A-2
A-3
780
2.7
4.0 (13.1)
2 Modes
R
R+P
* 0 - 1,100
1,100
* 0 - 4,500
4,500
24
(15/16)
54
(2-1/8)
65
(2-9/16)
13
(1/2)
32
(1-1/4)
352
(13-7/8)
72
(2-13/16)
204
(8)
2.3
(5.1)
SDS-plus
9
by double
insulation
620
2.2
4.0 (13.1)
3 Modes
R
R+P
P
* 0 - 870
870
* 0 - 4,850
4,850
24
(15/16)
68
(2-11/16)
80
(3-1/8)
13
(1/2)
32
(1-1/4)
360
(14-1/8)
SDS-plus
10
99
102
by double
insulation
620
2.2
5.0 (16.4)
3 Modes
R
R+P
P
0 - 1,350
0 - 4,400
24
(15/16)
50
(2)
120
(4-3/4)
13
(1/2)
32
(1-1/4)
318
(12-1/2)
72
(2-13/16)
70
(2-3/4)
185
(7-1/4)
2.4
(5.3)
205
(8-1/8)
2.4
(5.3)
SDS-plus
100
by double
insulation
HR2400 B-b
750
1.5
2.5 (8.2)
3 Modes
R
R+P
P
0 - 1,200
0 - 4,200
24
(15/16)
13
(1/2)
b:38(1-1/2)
347
(13-5/8)
71
(2-13/16)
185
(7-1/4)
2.4
(5.3)
SDS-plus
11
9.4 8.7 8.8 10.811.7
101
102
101
101
by double
insulation
a:24(15/16)
b:38(1-1/2) with
Spade bit
a:24(15/16) with
Auger bit
** No
Diamond Core : mm ( " ) ; Cutting capacity with both wet and dry type diamond core.
When using wet type dia core, employ HR2450 series model connecting
with residual current device.
** No ; But possible to set the chisel angle with chisel adapter.
Competitor A Competitor B

Comparison of products P 4 / 19
Testing conditions
* Materials : Concrete with compressive
strength, 350Kg/cm2
* Pressure added to the products : 80 N
Numbers in chart below are relative values when setting capacity of competitor A's model A-1 as 100.
80 N
Concrete with
compressive strength
350Kg/cm2
Comparison in hammer drilling
* Working mode : Rotary hammer
Bit diameter : 6.5mm
MAKITA HR2400
MAKITA HR2440
MAKITA HR2450
Bit diameter : 8.5mm
Comparison in drilling
0 50 100
100
100
110
110
100
150
MAKITA HR2400
MAKITA HR2440
MAKITA HR2450
0 50 100 150
Bit diameter : 12.5mm
MAKITA HR2400
MAKITA HR2440
MAKITA HR2450
0 50 100 150
105
105
85
80
105
105
70
100
Bit diameter : 32.0 mm
MAKITA HR2400
MAKITA HR2440
MAKITA HR2450
0 50 100 150
Testing conditions
* Materials : Douglas fir (Wood) of 60mm (2-3/8") in thickness
* Working mode : Drill
110
110
110
Competitor A A-1
Competitor A A-1
Competitor A A-1
Competitor A A-1

Repair P 5 / 19
< 1 > Lubrication
Apply the following MAKITA grease to protect parts and product from unusual abrasion.
* Grease RA No.1 (Brown) to the portions marked with black triangle
* Grease FA No.2 to the portions marked with gray triangle
* Disulphide molybdenum alloyed grease to the portion marked with white triangle
Cap 35
Change lever
Change lever
O ring 17
O ring 17
Spur gear 51
Piston cylinder
Piston cylinder
Gear housing Needle baring
O ring 68
O ring 68
Piston joint Inner housing
Inner housing
Helical gear 26
Helical gear 26
Spur gear 10
Spur gear 10
Clutch cam
Clutch cam
Swash bearing
Swash bearing 10
Tool holder
Tool holder
Steel ball 7.0
Steel ball 7.0
Cap 35 Inner lip of bit inserting side
Inner ring
Inner portion where tool holder contacts
Convex portion of cam
Inner portion where piston cylinder contacts
The portion where inner housing contacts
Inner portion where striker contacts
The portion where piston joint is assembled
Inner portion where tool holder contacts
The groove where O ring 68 is assembled
Inner portion where cam shaft contacts
The surface where helical gear 26 contacts
The portion where balls are installed
Convex portion of cam
Spiral portion
The hole where cam shaft contacts
Top of the pins
Whole part
Whole part
Whole part
Inner portion where the mechanical parts are installed.
Groove for O ring 17 assembling portion
Spur gear 51
Gear housing
Needle bearing
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown)
Grease RA No.1 (Brown) : 60g
Convex portion of cam
Disulphide molybdenum alloyed grease Whole of groove portion
Cam shaft
Grease FA No.2
Grease FA No.2 Whole of teeth portion

Repair P 6 / 19
< 2 > Disassembling chuck section
1. Slide chuck cover in the direction of gear housing, and pull out cap 35 by turning. See Fig. 1.
2. Take off ring spring 19. Then, the following parts can be disassembled from tool holder. See Fig. 1A.
< 3 > Assembling chuck section
1. Apply grease to steel ball 7.0 and cap 35 referring to < 1 > Lubrication at page 5.
2. Assemble conical compression spring 21-29 and guide washer, and hold guide washer with steel ball 7.0.
See Fig. 1B and Fig. 1A.
3. Assemble ring 21 and chuck cover to tool holder. And then, hold them with ring spring 19. See Fig. 1A.
4. Slide chuck cover in the direction of gear housing, and assemble cap 35 by turning. See Fig. 1.
* Chuck cover
* Ring 21
3. Take off steel ball 7.0 with which guide washer and conical compression spring 21-29 are held. See Fig. 1A.
Then, guide washer and conical compression spring 21-29 can be disassembled from tool holder. See Fig. 1B.
Fig. 1 Fig. 1A Fig. 1B
Cap 35
Chuck cover
Ring spring 19
Chuck cover
Ring 21
Steel ball 7.0
Gear housing
Guide washer
Conical compression
spring 21-29
Tool holder
< Note in assembling >
A. Pay attention to the assembling direction
of conical compression spring 21-29. Cap 35 side
The small portion : Gear housing side
The large portion : Cap 35 side
Gear housing side
Conical compression
spring 21-29
B. The cut portion of ring spring 19 has to come
to the opposite side of the flat portion of
tool holder.
The cut portion
of ring spring 19
The flat portion of
tool holder.

Repair P 7 / 19
< 5 > Assembling change lever
1. Apply grease to the pin of change lever and O ring 17 referring to < 1 > Lubrication at page 5.
2. Assemble compression spring 3 and lock button to change lever. And temporarily assemble cap to the position
illustrated in Fig. 3 in order to stop springing off of lock button. Do not forget to assemble O ring 17. See Fig. 3.
3. Insert the change lever in which compression spring 3 and lock button have been temporarily fixed with cap, into
the assembling hole of gear housing. See Fig. 3A. The change lever can not be inserted completely in this stage.
4. Pressing the change lever, turn it in the direction of drill mode. Then, it can be inserted completely
in any position of area B. See Fig. 3B.
5. Turn the change lever to the area C. See Fig. 3B. And assemble cap completely to the original position
of change lever, by pressing to gear housing side.
< 4 > Disassembling change lever
1. Separate cap from change lever. See Fig. 1.
2. Fully turn change lever in the direction of drill mode. Then, change lever can be pulled out from gear housing.
See Fig. 2A and Fig. 2B
Cap
Gear housing
Cap
Gear housing
Gear housing
Lock button
Compression spring 3
Fig. 2 Fig. 2A
Fig. 2B
Fig. 2C
Change lever
O ring 17
< Note >
Be careful, not to lose lock button and compression spring 3.
They can easily spring off. See Fig. 2C.
Cap
Change lever
Change lever
Change lever
Compression spring 3
Lock button
Cap assembled
temporarily
Cap assembled
completely by
pressing.
Lock button
Lock button
Compression
spring 3
Fig. 3
Fig. 3A
Fig. 3B
O ring 17
AInsert the change lever
within the area A.
B
If the change lever can not be inserted completely
in any position of area B, pressing lock button, turn it to the direction
of drill mode again in order to insert completely in any position of area B.
C
Compression
spring 3

Repair P 8 / 19
< 6 > Disassembling armature
1. Disassemble handle cover by unscrewing tapping screw 4 x 25. And disassemble carbon brushes
as illustrated in Fig. 4.
2. Separate gear housing together with armature, from motor housing by unscrewing tapping screws 4 x 45
as illustrated in Fig. 4A.
3. Slightly hitting the edge of gear housing with plastic hammer, remove armature from inner housing assembled in
gear housing. See Fig. 4B.
4. Ball bearings of fan side and commutator side can be disassembled with No.1R269 "Bearing extractor (small)".
See Fig. 4C.
Fig. 4 Fig. 4A
Fig. 4C
Fig. 4B
Carbon brush
Carbon brush
Handle
cover
Tapping s
crew 4 x 25 : 3 pcs.
Tapping s
crew 4 x 45 : 4 pcs.
Brush holder
Brush holder
Gear housing
Motor housing
Gear housing
Inner housing
Plastic hammer
No.1R269 "Bearing extractor (small)"
Ball bearing
Armature
< 7> Disassembling tool holder section
1. Disassemble change lever from gear housing as mentioned in < 4 > Disassembling change lever at page 7.
2. Separate gear housing from motor housing as illustrated in Fig. 4 and Fig. 4A. And disassemble armature as
illustrated in Fig. 4B.
3. Disassemble inner housing from gear housing as illustrated in Fig. 5.
4. Separate tool holder section from inner housing as illustrated in Fig. 5A. Pay attention, not to lose flat washer 28,
when separating tool holder section.
Fig. 4B
Inner housing
Plastic hammer
Fig. 5
Inner housing
Plastic hammer
Tool holder section
Inner housing
Tool holder section
Flat washer 28
Fig. 5A
Piston cylinder
Swash bearing section
Swash bearing section

Repair P 9 / 19
5. Ring spring 28 can not be removed without pressing washer 30 down to the spur gear 51 side, because it is
assembled between tool holder and washer 30. See Fig. 5B.
6. Disassemble ring spring 28 with retaining ring plier, pressing washer 30 down to the spur gear 51 side as
illustrated in Fig. 5C and Fig. 5D.
7. Disassemble washer 30, compression spring 31 and spur gear 51 from tool holder as illustrated in Fig. 5E.
Fig. 5B
Fig. 5E
Fig. 5C Fig. 5D
Washer 30 Spur gear 51
Compression
spring 31
Washer 30
Round bars
for arbor
Ring spring 28
Retaining ring
plier
Retaining ring
plier
No. 1R306 Ring spring
extractor
< 8 > Assembling tool holder section
1. Apply grease to spur gear 51 and tool holder referring to < 1 > Lubrication at page 5.
2. Assemble spur gear 5, compression spring 31 and washer 30 to tool holder as illustrated in Fig. 5E.
3. Pressing the washer 30 down to the spur gear 51 side, with arbor press, assemble ring spring 28 as illustrated
in Fig. 5D and Fig.5C.
4. Assemble flat washer 28 as illustrated in Fig. 5A at page 8.
5. Insert piston cylinder of swash bearing section into tool holder. And assemble tool holder section by pressing
into inner housing as illustrated in fig. 5A.

Repair P 10 / 19
< 9 > Disassembling impact bolt
1. Referring to < 7 > Disassembling tool holder section at page 8 and 9, disassemble ring spring 28, washer 30,
compression spring 31 and spur gear 51 from tool holder. See Fig. 5, Fig. 5A, B, C, D and E.
2. Push the cut portion of ring spring 28 to the out side of the hole as illustrated in Fig. 6 and Fig. A.
Cap 35 side Inner housing side
Ring spring 28 showing its
cut portion Ring spring
Push the cut portion to
the out side of the hole.
Push out ring spring 28 from
the inner groove.
O ring case O ring case
Fig. 6 Fig. 6A
Inner
housing side
Inner
housing side
Cap 35 side
Cap 35 side
3. Hold tool holder with "No.1R038 Armature holder" and vise. Insert screwdriver between ring spring 28
and O ring case. and push out ring spring 28 from the inner groove as illustrated in Fig. 6B.
Inner
housing side
Cap 35 side
O ring case
Inner groove of
tool holder
Ring spring 28
off from inner groove
Fig. 6B
Vise
No.1R038
Armature holder