Makita HR2452 Handbuch

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)

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

780 370

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

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 )

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+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

(15/16)

(2-1/8)

(2-9/16)

(1/2)

(1-1/4)

360

(14-1/8)

(2-13/16)

204

(8)

2.4

(5.3)

SDS-plus

Yes YesYes

101

by double

insulation

*HR2440

*HR2441

HR2442

* A-1

* A-2

A-3

780

2.7

4.0 (13.1)

2 Modes

R+P

* 0 - 1,100

1,100

* 0 - 4,500

4,500

(15/16)

(2-1/8)

(2-9/16)

(1/2)

(1-1/4)

352

(13-7/8)

(2-13/16)

204

(8)

2.3

(5.1)

SDS-plus

by double

insulation

620

2.2

4.0 (13.1)

3 Modes

R+P

* 0 - 870

870

* 0 - 4,850

4,850

(15/16)

(2-11/16)

(3-1/8)

(1/2)

(1-1/4)

360

(14-1/8)

SDS-plus

102

by double

insulation

620

2.2

5.0 (16.4)

3 Modes

R+P

0 - 1,350

0 - 4,400

(15/16)

(2)

120

(4-3/4)

(1/2)

(1-1/4)

318

(12-1/2)

(2-13/16)

(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+P

0 - 1,200

0 - 4,200

(15/16)

(1/2)

b:38(1-1/2)

347

(13-5/8)

(2-13/16)

185

(7-1/4)

2.4

(5.3)

SDS-plus

9.4 8.7 8.8 10.811.7

101

102

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

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

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

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

O ring 17

Spur gear 51

Piston cylinder

Gear housing Needle baring

O ring 68

Piston joint Inner housing

Inner housing

Helical gear 26

Spur gear 10

Clutch cam

Swash bearing

Swash bearing 10

Tool holder

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

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) : 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

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

Compression spring 3

Lock button

Cap assembled

temporarily

Cap assembled

completely by

pressing.

Lock button

Compression

spring 3

Fig. 3

Fig. 3A

Fig. 3B

O ring 17

AInsert the change lever

within the area A.

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.

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

Handle

cover

Tapping s

crew 4 x 25 : 3 pcs.

Tapping s

crew 4 x 45 : 4 pcs.

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

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

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

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