Makita HR2450T, HR2450FT User Manual

ECHNICAL INFORMATION

Models No.

HR2450FT, HR2450T

PRODUCT

P 1 / 22

Description

24mm (15/16") Rotary Hammer

CONCEPTION AND MAIN APPLICATIONS

The above models are the advanced version of MAKITA's famous 3 -mode rotary hammer HR2450.

Each new model features : HR2450T : possible to quickly change from the chuck for SDS-plus to keyless drill chuck mutually without any tool HR2450FT : equipped with built in job light in addition to HR2450T's feature

Specification

Voltage (V) Cycle (Hz)

110 7.5 120

220 230 240

Model No. HR2450FT HR2450T

No load speed : (min -1= rpm)

Blows per min, :(bpm=min -1) Single blow energy ( J ) Variable switch

Reverse switch

Bit shank

Concrete : mm (") Steel. : mm (")

Wood : mm (")

Capacity

Protection against electric shock

Built in job light Cord length : m ( ft )

Net weight :Kg (lbs )

Current (A)

6.7

3.7

3.6

3.4

50 / 60 50 / 60

50 / 60 50 / 60 50 / 60

0 - 1,100 0 - 1,100 0 - 4,500 0 - 4,500

2.7 2.7

Yes Yes Yes

SDS plus type

* 24 (15/16 )

13 (1/2 ) 13 (1/2 ) 32 (1-1/4 ) 32 (1-1/4 )

double insulation double insulation

Yes No

** 4 (13.1) ** 4 (13.1)

2.6 (5.7) 2.6 (5.7)

Model No. Length ( L )

Height ( H )

Width ( W )

Input Output

Yes

SDS plus type

* 24 (15/16 )

Dimensions : mm ( " )

HR2450FT HR2450T

384 (15-1/8)

212 (8-3/8) 204 (8)

72 (2-13/16)

Continuous Rating (W)

780 780 780 780 780

370 370 370 370 370

* 25mm (1") for USA.

** 2.5m (8.2 ft) for Asia ** 2.0m (6.6 ft) for Australia

Max. Output(W)

650 650 650 650 650

Standard equipment

* Stopper pole ........................ 1 pc.

* Quick change drill chuck ..... 1 pc.

* Plastic carrying case ............ 1 pc.

< Note > The standard equipment for the tool shown may differ from country to country.

* Side grip ..................... 1 pc.

Optional accessories

* T.C.T hammer drill bits 5.5mm - 24mm (7/32" - 15/16") * Bull point 14mm (9/16") * Cold chisel 20mm (13/16") * Scaling chisels 38mm and 50mm (1-1/2" and 2") * Grooving chisels 8mm and 12mm (5/16" and 1/2") * Scraper assembly

* Core bits * Center bits * Core bit adaptor * Rod * Core bits (dry type) * Taper shank adaptor * Taper shank T.C.T.hammer drill bits * SDS plus hammer chuck set * SDS plus adapter

* Dust cups 5 and 9 * Safety goggle * Bit grease * Blow out bulb * Dust extractor attachment * Hammer service kit

Repair

< 1 > Lubrication to the bit holder section Apply MAKITA grease to the following portions to protect parts and product from unusual abrasion. * MAKITA grease RA No.1 to the portions designated with black triangle. * MAKITA grease FA No. 2 to the portions designated with gray triangle. * MAKITA hammer oil to the portions with white triangle.

P 2 / 22

Position No.

95 Cap 35 Inner lip of bit inserting side. 98 Stopper

99 Steel ball 7

104 108

103

Parts item

Steel ball 6 Steel ball 5.0

Tool holder

Portion to be lubricated

The inside where (103) tool holder contacts. Whole part Whole part Whole part

The inside where (21) tool holder guide contacts.

Quick change chuck assembly

96 97

100

101

102

108

MAKITA grease

MAKITA grease RA No.1

MAKITA grease FA No.2

103104

105

106

107

109

Amount : g (oz)

1.0 (0.04)

111

110

Position No.

104 108

Parts item

Steel ball 6 Steel ball 5.0

Portion to be lubricated

Whole part Whole part

Quick change drill chuck assembly

108

104

105

106

MAKITA grease

MAKITA grease RA No.1

107

109

Amount : g (oz)

1.0 (0.04)

111

110

Repair

< 2 > Lubrication to the machine parts Apply MAKITA grease to the following portions to protect parts and product from unusual abrasion. * MAKITA grease RA No.1 to the portions designated with black triangle. * MAKITA grease FA No. 2 to the portions designated with gray triangle. * MAKITA hammer oil to the portions designated with white triangle. * Disulphide molybdenum alloyed grease to the portions designated with arrow.

P 3 / 22

Position No.

12 13

14 15

19 21

23 26 28

Parts item Change lever Top of the pins O ring 17

Gear housing Needle bearing

Spur gear 51 Tool holder guide X ring 9

O ring 15 O ring 9

Piston cylinder

Clutch cam

Swash bearing 10

Helical gear 26

Portion to be lubricated

Whole portion Inner portion for the mechanical parts Groove for mounting (13) O ring 17

Inner ring Inner portion where (21) tool holder guide contacts. Inner portion where (32) piston cylinder contacts. The portion where (49) inner housing contacts.

Inner hole for reciprocating (24) impact bolt. Whole portion Whole portion Accepting hole for (34) piston joint

Inner portion where (30) striker reciprocates. Convex portion of cam

Whole of groove portion

Accepting hole for (40) cam shaft

The surface where (42) helical gear 26 contacts. Convex portion of cam The portion where balls are installed

Teeth portion

MAKITA grease

MAKITA grease RA No.1

Disulfide molybdenum alloyed grease

MAKITA grease FA No.2

Amount : g(oz)

1.0 (0.04)

1.0 (0.04) 55 (1.91)

1.0 (0.04)

0.5 (0.02)

1.0 (0.04)

4.0 (0.14)

O ring 68

Spur gear 10

Whole portion

Teeth portion Accepting hole for (40) cam shaft

80 39

1915

34 48

22 23 24 25 26 27 28 2993

41 42

MAKITA hammer oil XLD

MAKITA grease RA No.1

1.0 (0.04)

Repair

< 3 > Assembling quick change chuck

(1) Mount torsion spring 31 by inserting pin of torsion spring 31 into the hole of tool holder and mount 2 pcs. of steel ball 6.0 to tool holder. See Fig. 1.

Torsion spring 31

Long pin of torsion spring 31

Tool holder

P 4 / 22

Short Pin of torsion spring 31

Coat the steel ball 6.0 with MAKITA grease N No.1, before mounting. Now the steel ball sticks on the hole of tool holder.

(2) Mount change ring to the inside of change cover while aligning the hole of change ring with the hole of change cover. See Fig. 2.

Change ring

Change cover

Steel ball 6.0

Long Pin of torsion spring 31

Fig. 1

Holes for pin of torsion spring 31

Change ring

Change cover

Fig. 2

(3) Mount tool holder to change cover by passing the long pin of torsion spring 31 through the holes of change ring and change cover. And turn the tool holder approx. by 75

Long pin of torsion spring 31

The hole of change ring aligned with the hole of change cover

Fig. 3

° . See Fig. 3.

Approx. 75

Repair

(4) Mount steel ball 5.0 to the space between change cover and tool holder. And secure the steel ball 5.0 with leaf spring. See Fig. 4.

(5) Mount flat washer 24. See Fig. 5. (6) Secure flat washer 24 with ring spring 21. See Fig. 6.

Steel ball 5.0

Flat washer 24

P 5 / 22

Leaf spring

Fig. 4

(7) Mount flat washer 2. And then mount steel ball 7.0 to the hole of tool holder. See Fig. 7.

Coat the steel ball 7.0 with MAKITA grease N No.1, before mounting. Now the steel ball sticks on the hole of tool holder.

(8) Mount conical compression spring 21-29, guide washer and stopper. See Fig. 8. (9) Mount chuck cover. See Fig. 9. (10) While sliding the chuck cover in the direction designated with arrow, mount ring spring 19. See Fig. 10.

Now the parts mounted in Fig. 7, Fig. 8 and Fig.9 have been secured with the ring spring 19. (11) Mount cap 35 as illustrated in Fig. 11.

Flat washer 21

Steel ball 7.0

Fig. 7

If it is difficult to mount leaf spring with your hand, mount it with "retaining ring plier for shaft."

Stopper

Guide washer

Conical compression spring 21-29

Fig. 8

Leaf spring

Chuck cover

Fig. 5

Ring spring 21

Fig. 6

Slide chuck cover.

Cap 35

Ring spring 19

Fig. 11

Fig. 9

< 4 > Disassembling quick change chuck

(1) Remove cap 35 while sliding chuck cover in the direction designated with arrow. See Fig. 12. (2) Remove ring spring 19, keeping the chuck cover in the slid position. See Fig. 12.

(3) Remove chuck cover, stopper, guide washer, conical compression spring 21-29. See Fig. 13. (4) Remove steel ball 7.0 and flat washer 21. See Fig. 14.

Stopper

Guide washer

Conical compression spring 21-29

Fig. 13

Cap 35

Chuck cover

Ring spring 19

Fig. 12

Chuck cover

Fig. 10

Flat washer 21

Steel ball 7.0

Fig. 14

Repair

(5) Remove ring spring 21. Then, flat washer 24 can be removed from tool holder. See Fig. 15. (6) Remove leaf spring with No.1R212 "Retaining Ring Plier". Then, steel ball 5.0 can be removed from tool holder.

See Fig. 16. If it is difficult to remove leaf spring with No.1R212 "Retaining Ring Plier", slightly knock the change cover to the working table several times. Then, leaf spring can be removed. See Fig. 16A.

(7) Remove tool holder and change ring from change cover. See Fig. 17. (8) Remove torsion spring 31 and steel ball 6.0 from tool holder. See Fig. 18.

P 6 / 22

Flat washer 24

Ring spring 21

Tool holder

Change ring

Change cover

Fig. 17

Leaf spring

Fig. 15

Flat washer 24

Steel ball 5.0

Leaf spring

Fig. 16

Torsion spring 31

Tool holder

Steel ball 6.0

Fig. 18

Change cover

Leaf spring

Fig. 16A

< 5 > Assembling quick change drill chuck

(1) Mount keyless drill chuck 13 to chuck holder by turning it clockwise. See Fig. 19. (2) Secure the keyless drill chuck by turning flat head screw M6x22 counter-clockwise. See Fig. 19. (3) Mount the keyless drill chuck, while aligning the flat portion of chuck holder with the flat portion of spacer.

See Fig. 20.

Spacer

Keyless drill chuck 13

Flat head screw M6x22

Fig. 19

Chuck holder

Hold this part with vise firmly.

Fastening torque for keyless drill chuck 13 is 36 - 46N.m.

Chuck holder

Align the flat portion.

Fig. 20

Repair

(4) Mount torsion spring 31 to the chuck holder by inserting its short pin into the pin hole of chuck holder. See Fig. 21.

(5) Mount change ring to the inside of change cover while aligning the hole of change ring with the hole of change cover. See Fig.22.

(6) Keyless drill chuck 13 to change cover by passing the long pin of torsion spring 31 through the holes of change ring and change cover. And turn the keyless drill chuck 13 approx. by 75

(7) Mount steel ball 5.0 to the space between change cover and chuck holder. And secure the steel ball 5.0 with leaf spring. See Fig. 24.

(8) Mount flat washer 24. See Fig. 25. (9) Secure flat washer 24 with ring spring 21. See Fig. 26.

Change ring

° . See Fig. 23.

Holes for pin of torsion spring 31

P 7 / 22

Insert the short pin of torsion spring 31 into the pin hole of chuck holder.

Fig. 21

Long pin of torsion spring 31

Change cover

The hole of change ring aligned with the hole of change cover

Fig. 23

Change ring

Fig. 22

Approx. 75

Change cover

Steel ball 5.0

Leaf spring If it is difficult to mount leaf spring with your hand, mount it with "retaining ring plier for shaft."

Fig. 24

Leaf spring

Flat washer 24

Fig. 25

Flat washer 24

Ring spring 21

Fig. 26

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