Makita HR2450FT Manual

Models No.
Description
PRODUCT
TECHNICAL INFORMATION
CONCEPTION AND MAIN APPLICATIONS
Specification
Standard equipment
Optional accessories
< Note > The standard equipment for the tool shown may differ from country to country.
P 1 / 22
HR2450FT, HR2450T
24mm (15/16") Rotary Hammer
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
Dimensions : mm ( " )
Width ( W )
Height ( H )
Length ( L )
Model No. 384 (15-1/8)
212 (8-3/8) 204 (8)
72 (2-13/16)
HR2450FT HR2450T
W
H
L
780
780
780
780
780
370
370
370
370
370
650
650
650
650
650
Continuous Rating (W)
Voltage (V) Cycle (Hz) Input Output Max. Output(W)
110 7.5
6.7
3.7
3.6
3.4
120
220
230
240
Current (A)
50 / 60
50 / 60
50 / 60
50 / 60
50 / 60
Model No. HR2450FT HR2450T
Bit shank SDS plus type
Blows per min, :(bpm=min -1)
No load speed : (min -1= rpm)
Protection against electric shock
Net weight :Kg (lbs )
Cord length : m ( ft )
Single blow energy ( J )
Variable switch
Reverse switch
Steel. : mm (")
Wood : mm (")
Concrete : mm (")
SDS plus type
Yes Yes
Yes Yes
2.7 2.7
0 - 1,100 0 - 1,100
0 - 4,500 0 - 4,500
* 24 (15/16 ) * 25mm (1") for USA.
13 (1/2 ) 13 (1/2 )
* 24 (15/16 )
32 (1-1/4 ) 32 (1-1/4 )
double insulation double insulation
** 4 (13.1) ** 4 (13.1)
2.6 (5.7) 2.6 (5.7) ** 2.5m (8.2 ft) for Asia
** 2.0m (6.6 ft) for Australia
Built in job light Yes No
* Stopper pole ........................ 1 pc.
* Quick change drill chuck ..... 1 pc.
* Plastic carrying case ............ 1 pc.
* Side grip ..................... 1 pc.
* 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
Capacity

Repair P 2/ 22
< 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.
Position
No. Parts item MAKITA
grease Amount : g (oz)
Portion to be lubricated
Position
No. Parts item MAKITA
grease Amount : g (oz)
Portion to be lubricated
Quick change chuck assembly
95
95 Cap 35 Inner lip of bit inserting side.
Whole part
Whole part
Whole part
Whole part
Whole part
The inside where (103) tool holder contacts.
The inside where (21) tool holder guide contacts.
96 97 98
98 Stopper
99
99 Steel ball 7
Steel ball 6
Steel ball 6
100 101 102 103104
104
104
104
Tool holder
103
Steel ball 5.0
Steel ball 5.0
108
105 106 107 109 110
108
108
108
111
105 106 107 109 110 111
MAKITA
grease RA No.1
MAKITA
grease RA No.1
MAKITA
grease FA No.2
Quick change drill chuck assembly
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)

Repair P 3/ 22
< 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.
1915
14
12
13
80 39 40 41 42 49
21 22 23 24 25 26 27 28 2993
32
30 34 48
Position
No. Parts item
Change lever Top of the pins
Whole portion
MAKITA
grease Amount : g(oz)
Portion to be lubricated
12 O ring 17
13 Inner portion for the mechanical parts
Groove for mounting (13) O ring 17
Gear housing
14
Needle bearing
15 Spur gear 51
19
MAKITA
grease RA No.1
Inner ring
Inner portion where (21) tool holder guide contacts.
Inner hole for reciprocating (24) impact bolt.
Inner portion where (30) striker reciprocates.
Tool holder guide
21
X ring 9
23 Whole portion
O ring 15
26 Whole portion
O ring 9
28 Accepting hole for (34) piston joint
Piston cylinder
32
Clutch cam
39
Whole portion
Teeth portion
O ring 68
48
Swash bearing 10
Helical gear 26
41
42
Teeth portion
Spur gear 10
80 Accepting hole for (40) cam shaft
Accepting hole for (40) cam shaft
The surface where (42) helical gear 26 contacts.
Inner portion where (32) piston cylinder contacts.
The portion where (49) inner housing contacts.
Disulfide molyb-
denum alloyed
grease
Whole of groove portion
Convex portion of cam
Convex portion of cam
The portion where balls are installed
MAKITA
grease FA No.2
MAKITA
hammer oil XLD
MAKITA
grease RA No.1
55 (1.91)
0.5 (0.02)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
4.0 (0.14)

Repair P 4/ 22
< 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.
(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.
(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 °. See Fig. 3.
Short Pin of
torsion spring 31
Long 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.
Torsion spring 31
Tool holder
Steel ball 6.0
Fig. 1
Fig. 2
Change cover
Change ring
Change cover
Change ring
Holes for pin of torsion spring 31
Long Pin of
torsion spring 31
The hole of change ring
aligned with the hole of
change cover
Long pin of
torsion spring 31 Approx. 75
°
Fig. 3

Repair P 5/ 22
< 4 > Disassembling quick change chuck
(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.
(7) Mount flat washer 2. And then mount steel ball 7.0 to the hole of tool holder. See Fig. 7.
(8) Mount conical compression spring 21-29, guide washer and stopper. See Fig. 8.
(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.
(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.
Fig. 4 Fig. 5 Fig. 6
Fig. 7 Fig. 8
Fig. 9 Fig. 10
Fig. 11
Steel ball 5.0
Leaf spring Leaf spring
Flat washer 24 Flat washer 24
If it is difficult to mount
leaf spring with your hand,
mount it with "retaining
ring plier for shaft."
Ring spring 21
Steel ball 7.0
Flat washer 21 Stopper
Guide washer
Conical
compression
spring 21-29
Chuck cover
Ring spring 19
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.
Cap 35
Slide chuck
cover.
Ring spring 19
Cap 35
Chuck cover
Fig. 12
Chuck cover Stopper
Guide washer
Conical
compression
spring 21-29
Fig. 13
Steel ball 7.0
Flat washer 21
Fig. 14

Repair P 6/ 22
< 5 > Assembling quick change drill chuck
Leaf spring
Flat washer 24
Flat washer 24
Ring spring 21
Steel ball 5.0
Leaf spring
Leaf spring
Fig. 15 Fig. 16
Fig. 18
Fig. 16A
(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.
(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.
Fig. 17
Tool holder
Change ring
Change cover
Torsion spring 31
Tool holder
Steel ball 6.0
Chuck holder
Hold this part with
vise firmly.
Keyless
drill chuck 13
Flat head
screw M6x22
Fig. 19
Align the flat
portion.
Align the flat
portion.
Chuck holder Spacer
Fig. 20
Change
cover
Fastening torque for
keyless drill chuck 13
is 36 - 46N.m.

Repair P 7/ 22
(4) Mount torsion spring 31 to the chuck holder by inserting its short pin into the pin hole of chuck holder.
See Fig. 21.
Insert the short pin
of torsion spring 31
into the pin hole of
chuck holder.
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.
Change cover
Change ring
Change cover
Change ring
Holes for pin of torsion spring 31
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 °. See Fig. 23.
The hole of change ring
aligned with the hole of
change cover
Long pin of
torsion spring 31 Approx. 75
°
Fig. 23
Steel ball 5.0
Leaf spring
Leaf spring
If it is difficult to mount
leaf spring with your hand,
mount it with "retaining
ring plier for shaft."
Flat washer 24
Flat washer 24
Ring spring 21
Fig. 24
Fig. 25
Fig. 26
(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.

Repair P 8/ 22
< 6 > Disassembling quick change drill chuck
Fig. 27 Fig. 28
Fig. 29
Fig. 30
Fig. 29A
Fig. 31 Fig. 32
Fig. 33 Fig. 34
Steel ball 5.0
Leaf spring
Leaf spring
Flat washer 24
Flat washer 24
Ring spring 21
Leaf spring
(1) Remove ring spring 21. Then, flat washer 24 can be removed from chuck holder. See Fig. 27 and Fig. 28.
(2) Remove leaf spring with No.1R212 "Retaining Ring Plier". Then, steel ball 5.0 can be removed from chuck holder.
See Fig. 29.
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. 29A.
(3) Remove keyless drill chuck with spacer and change ring from change cover. See Fig. 30.
(4) Remove torsion spring 31 from chuck holder. See Fig. 31.
(5) Remove spacer from chuck holder. See Fig. 32.
(6) Remove flat head screw M6x22 by tuning it clockwise. See Fig. 33.
(7) Remove keyless drill chuck 13 by tuning it counter clockwise. See Fig. 34.
Change
cover
Keyless
drill chuck
Spacer
Spacer
Change ring
Change cover
Torsion spring 31 Keyless
drill chuck
Chuck holder
Hold this part with
vise firmly for easy
removing of keyless
drill chuck.
Keyless
drill chuck 13
Flat head
screw M6x22

Repair P 9/ 22
< 7 > Disassembling change lever
(1) Separate cap from change lever. See Fig. 35.
(1) Apply grease to the pin of change lever and O ring 17. Refer to "< 2 > Lubrication to the machine parts" in page 3.
< Note >
Be careful, not to lose lock button
and compression spring 3.
They can easily spring off.
(2) Fully turn change lever in the direction of drill mode. Then, change lever can be pulled out from gear housing.
See Fig. 36.
< 8 > Assembling change lever
Fig. 36
Fig. 37
Fig. 38
Fig. 39
Cap
Gear housing
Cap
Gear housing
Gear housing
Lock button
Compression spring 3
Fig. 35
Fig.36F
Change
lever
O ring 17
(2) Assemble compression spring 3 and lock button to change lever. And temporarily assemble cap to the position
illustrated in Fig. 37 in order to stop springing off of lock button. Do not forget to assemble O ring 17. See Fig. 37.
(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. 38. 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. 39.
(5) Turn the change lever to the area C. See Fig. 39. And assemble cap completely to the original position
of change lever, by pressing to gear housing side.
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
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 10/ 22
< 9 > Disassembling armature
Fig. 40
Fig. 41
Fig. 42
Fig. 43
1. Remove handle cover by unscrewing 3 pcs. of tapping screw 4 x 45.And remove carbon brushes
as illustrated in Fig. 40.
2. Separate gear housing together with armature, from motor housing by unscrewing 4 pcs. of tapping screw 4 x 45
as illustrated in Fig. 41.
3. Slightly hitting the edge of gear housing with plastic hammer, remove armature from inner housing assembled in
gear housing. See Fig. 42.
4. Ball bearings of fan side and commutator side can be removed with No.1R269 "Bearing extractor (small)".
See Fig. 43.
Carbon brush
Carbon brush
Handle
cover
Tapping screw
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
Inner housing
Plastic hammer