ECHNICAL INFORMATION
PRODUCT
P 1 / 22
T
HR2450FT, HR2450T
Models No.
Description
L
24mm (15/16") Rotary Hammer
CONCEPTION AND MAIN APPLICATIONS
H
The above models are the advanced version of MAKITA's
famous 3 -mode rotary hammer HR2450.
Each new model features :
W
HR2450T : possible to quickly change from
the chuck for SDS-plus to keyless
Dimensions : mm ( " )
drill chuck mutually without any tool
Model No.
HR2450FT
HR2450T
HR2450FT : equipped with built in job light
Length ( L )
384 (15-1/8)
in addition to HR2450T's feature
Height ( H ) 212 (8-3/8)
Width ( W )
204 (8)
72 (2-13/16)
Specification
Continuous Rating (W)
Input Output
Voltage (V)
Cycle (Hz)
Max. Output(W)
Current (A)
110
120
220
230
240
7.5
6.7
3.7
3.6
3.4
50 / 60
50 / 60
780
780
780
780
780
370
370
370
370
370
650
650
650
650
650
50 / 60
50 / 60
50 / 60
Model No.
HR2450FT
HR2450T
No load speed : (min -1= rpm)
Blows per min, :(bpm=min -1)
Single blow energy ( J )
Variable switch
0 - 1,100
0 - 4,500
0 - 1,100
0 - 4,500
2.7
Yes
2.7
Yes
Reverse switch
Bit shank
Yes
SDS plus type
Yes
SDS plus type
* 24 (15/16 )
13 (1/2 )
* 24 (15/16 )
13 (1/2 )
Concrete : mm (")
Steel. : mm (")
* 25mm (1") for USA.
32 (1-1/4 )
32 (1-1/4 )
Wood : mm (")
Protection against electric shock
Built in job light
double insulation double insulation
Yes
No
** 4 (13.1)
2.6 (5.7)
** 4 (13.1)
2.6 (5.7)
Cord length : m ( ft )
Net weight :Kg (lbs )
** 2.5m (8.2 ft) for Asia
** 2.0m (6.6 ft) for Australia
Standard equipment
* Stopper pole ........................ 1 pc. * Side grip ..................... 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.
Optional accessories
* T.C.T hammer drill bits 5.5mm - 24mm
(7/32" - 15/16")
* Core bits
* Center bits
* Dust cups 5 and 9
* Safety goggle
* 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")
* Core bit adaptor
* Rod
* Bit grease
* Blow out bulb
* Dust extractor attachment
* Hammer service kit
* Core bits (dry type)
* Taper shank adaptor
* Taper shank T.C.T.hammer drill bits
* SDS plus hammer chuck set
* SDS plus adapter
* Scraper assembly
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P 3 / 22
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.
MAKITA
grease
Amount
: g(oz)
Position
No.
Parts item
Change lever
O ring 17
Portion to be lubricated
Top of the pins
12
13
1.0 (0.04)
1.0 (0.04)
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.
55 (1.91)
1.0 (0.04)
14
Gear housing
Needle bearing
Spur gear 51
1.0 (0.04)
1.0 (0.04)
15
19
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
21
Tool holder guide
MAKITA
grease RA No.1
X ring 9
O ring 15
O ring 9
23
26
28
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
1.0 (0.04)
1.0 (0.04)
1.0 (0.04)
Piston cylinder
32
Disulfide molyb-
denum alloyed
grease
39
Clutch cam
Whole of groove portion
0.5 (0.02)
Accepting hole for (40) cam shaft
The surface where (42) helical gear 26 contacts.
Convex portion of cam
1.0 (0.04)
1.0 (0.04)
Swash bearing 10
41
MAKITA
grease FA No.2
1.0 (0.04)
4.0 (0.14)
The portion where balls are installed
Teeth portion
42
48
Helical gear 26
O ring 68
MAKITA
hammer oil XLD
Whole portion
1.0 (0.04)
MAKITA
grease RA No.1
1.0 (0.04)
1.0 (0.04)
Teeth portion
Accepting hole for (40) cam shaft
Spur gear 10
80
15
30
19
32
21
34
22 23 93
24 25 26 27 28 29
13
14
48
12
40
49
80
39
41
42
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P 4 / 22
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
Short Pin of
torsion spring 31
Steel ball 6.0
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.
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.
Change ring
Holes for pin of torsion spring 31
Change cover
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°. See Fig. 3.
The hole of change ring
Long pin of
aligned with the hole of
torsion spring 31
change cover
Approx. 75
°
Fig. 3
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P 5 / 22
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
Flat washer 24
If it is difficult to mount
Leaf spring
leaf spring with your hand,
Ring spring 21
Leaf spring
Fig. 5
mount it with "retaining
ring plier for shaft."
Fig. 6
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.
Stopper
Chuck cover
Slide chuck
cover.
Flat washer 21
Guide washer
Cap 35
Conical
compression
spring 21-29
Steel ball 7.0
Fig. 7
Ring spring 19
Fig. 11
Fig. 8
Fig. 9
Fig. 10
< 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
Ring spring 19
Flat washer 21
Chuck cover
Guide washer
Cap 35
Conical
compression
spring 21-29
Chuck cover
Steel ball 7.0
Fig. 14
Fig. 12
Fig. 13
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P 6 / 22
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.
Flat washer 24
Steel ball 5.0
Flat washer 24
Change
cover
Leaf spring
Leaf spring
Leaf spring
Fig. 16
Ring spring 21
Fig. 15
Fig. 16A
Tool holder
Torsion spring 31
Change ring
Tool holder
Change cover
Steel ball 6.0
Fig. 18
Fig. 17
< 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
Chuck holder
Chuck holder
drill chuck 13
Keyless
Align the flat
portion.
Hold this part with
vise firmly.
Align the flat
portion.
Flat head
screw M6x22
Fastening torque for
keyless drill chuck 13
is 36 - 46N.m.
Fig. 20
Fig. 19
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P 7 / 22
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°. See Fig. 23.
(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
Holes for pin of torsion spring 31
Change cover
Insert the short pin
of torsion spring 31
into the pin hole of
chuck holder.
Change ring
Change cover
Fig. 21
Fig. 22
The hole of change ring
Long pin of
aligned with the hole of
torsion spring 31
change cover
Approx. 75
°
Fig. 23
Flat washer 24
Steel ball 5.0
Leaf spring
Leaf spring
Ring spring 21
If it is difficult to mount
leaf spring with your hand,
mount it with "retaining
ring plier for shaft."
Flat washer 24
Fig. 25
Fig. 26
Fig. 24
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P 8 / 22
Repair
< 6 > Disassembling quick change drill chuck
(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.
Flat washer 24
Leaf spring
Ring spring 21
Fig. 27
Flat washer 24
Fig. 28
Keyless
drill chuck
Steel ball 5.0
Spacer
Change
cover
Change ring
Change cover
Leaf spring
Leaf spring
Fig. 30
Fig. 29
Fig. 29A
(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.
Chuck holder
Spacer
Keyless
drill chuck 13
Keyless
drill chuck
Hold this part with
vise firmly for easy
removing of keyless
drill chuck.
Torsion spring 31
Fig. 31
Fig. 32
Flat head
screw M6x22
Fig. 34
Fig. 33
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P 9 / 22
Repair
< 7 > Disassembling change lever
(1) Separate cap from change lever. See Fig. 35.
(2) Fully turn change lever in the direction of drill mode. Then, change lever can be pulled out from gear housing.
See Fig. 36.
Gear housing
Cap
Change
lever
Gear housing
Fig. 35
O ring 17
Fig. 36
Lock button
Compression spring 3
< Note >
Cap
Be careful, not to lose lock button
and compression spring 3.
They can easily spring off.
Gear housing
Fig.36F
< 8 > Assembling change lever
(1) Apply grease to the pin of change lever and O ring 17. Refer to "< 2 > Lubrication to the machine parts" in page 3.
(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.
Lock button
Compression spring 3
A
Insert the change lever
within the area A.
Change lever
Cap
Fig. 38
Lock button
Cap assembled
completely by
pressing.
O ring 17
C
Lock button
Cap, assembled
temporarily
B
Compression
spring 3
Compression
spring 3
Change lever
Fig. 39
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
Change lever
Fig. 37
to insert completely in any position of area B.
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P 10 / 22
Repair
< 9 > Disassembling armature
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.
Tapping s
crew 4 x 45 : 4 pcs.
Gear housing
Motor housing
Brush holder
Carbon brush
Brush
holder
Carbon brush
Tapping screw
4 x 25 : 3 pcs.
Handle
cover
Fig. 40
Fig. 41
Gear housing
Inner housing
Ball bearing
Armature
No.1R269
"Bearing extractor (small)"
Plastic hammer
Fig. 43
Fig. 42
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P 11 / 22
Repair
< 10 > Disassembling tool holder guide section
( 1 ) After removing change lever ( See page 9), separate gear housing from motor housing as illustrated
in Fig. 40 and Fig. 41 in page 10.
( 2 ) Remove inner housing as illustrated in Fig. 44.
( 3 ) Separate tool holder guide section from inner housing. See Fig. 45.
( 4 ) Remove ring spring 29, while pressing washer 31 which covers ring spring 29, toward the spur gear 51 side.
See Fig. 46 and 47. After removing ring spring 29, reduce pressure on the washer 31 slowly.
( 5 ) Remove washer 31, compression spring 32 and spur gear 51 form tool holder guide. See Fig. 48.
Tool holder
guide section
Flat washer 28
Piston cylinder
Inner housing
Inner
housing
Tool holder
guide section
Swash bearing
section
Swash bearing
section
Fig. 45
Fig. 44
No. 1R306
Ring spring
extractor
Washer 31
Compression
spring 32
Ring
spring 29
Round bars
for arbor
Spur gear 51
Ring
spring 29
Retaining
ring plier
Tool
holder guide
Washer 31
Washer 31
Retaining ring
plier
Fig. 47
Fig. 46
Fig. 48
< 11 > Assembling tool holder guide section
( 1 ) Apply grease to spur gear 51 and tool holder guide referring to "< 2 > Lubrication to the machine parts"
in page 3.
( 2 ) Mount spur gear 51, compression spring 32 and washer 31. See Fig. 48.
( 3 ) Pressing the washer 31 toward the spur gear 51 side, with arbor press, mount ring spring 29 as illustrated
in Fig. 47 and Fig. 46. And mount flat washer 28 to the position illustrated in Fig. 45.
( 4 ) Insert piston cylinder of swash bearing section into tool holder guide. And insert tool holder section into inner
housing as illustrated in Fig. 45.
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P 12 / 22
Repair
< 12 > Disassembling impact bolt
( 1 ) Referring to "< 10 > Disassembling tool holder guide section" in page 11, remove ring spring 29, washer 31,
compression spring 32 and spur gear 51 from tool holder guide. See Fig. 44, 45, 46, 47 and Fig. 48.
( 2 ) Push the cut portion of ring spring 28 to the out side of the hole as illustrated in Fig. 49 and Fig. 49A.
Ring spring 28 showing its
cut portion
Tool holder
Ring spring
Inner
housing side
or
Chuck holder side
O ring case
O ring case
Push the cut portion to
the out side of the hole.
Fig. 49A
Ring spring 28
Fig. 49
Tool holder
or
Chuck holder side
Inner
housing side
Impact bolt
X ring
Sleeve 9
O ring case
Ring 10
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. 50.
Tool holder
or
Push out ring spring 28 from
Chuck holder side
the inner groove.
Inner groove of
Cap 35 side
tool holder
No.1R038
Armature holder
O ring case
Ring spring 28
off from inner groove
Inner
housing side
Inner
housing side
Fig. 50
Vise
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P 13 / 22
Repair
4. Insert "No.1R236 Round bar for arbor" and push the inner parts of tool holder guide as deep as possible toward the
inner housing side. See Fig. 51
5. Pick up ring spring 28 with plier and take off it from tool holder guide as illustrated in Fig. 52.
6. The following parts can be removed from tool holder guide as illustrated in Fig. 53.
* O ring case with O ring 9
* O ring 15
* Ring 10
* Impact bolt
* Sleeve 9
* X ring 9
Ring spring 28
Fig. 52
Tool holder
guide
X ring 9
Sleeve 9
Vise
Impact bolt
Fig. 51
Ring 10
O ring 15
O ring case
Fig. 52
with O ring 9
< 13 > Assembling impact bolt
1. Apply grease to the following parts referring to "< 2 > Lubrication to the machine parts" in page 3
* Tool holder guide
* X ring 9
* O ring 9 to be mounted to the O ring box
* O ring 15
2. Insert X ring 9, sleeve 9, impact bolt, ring 10, O ring 15 and O ring case with O ring 9 into tool holder.
3. Assemble ring spring 28 to the inner groove of tool holder by pushing it with screwdriver. Ring spring 28 has to be
mounted as illustrated in Fig. 53.
Ring 10
Impact bolt
O ring 15
< Note >
Ring spring 28
Do not install the used ring spring 28.
Always mount the fresh one.
O ring 9
Fig. 53
X ring 9
Sleeve 9
O ring case
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Repair
P 14 / 22
< 14 > Disassembling swash bearing
(1) Referring to at page 6, disassemble the product in the order of Fig.40, Fig.41, Fig.42, Fig.44 and Fig. 45
in page 10 and 11.
And separate inner housing together with tool holder section and swash bearing section from gear housing as
illustrated in Fig. 54. Ball baring 606ZZ can remain in gear housing in this stage. If so, refer to Fig. 59 at page 15.
(2) Separate tool holder section from inner housing as illustrated in Fig. 55.
Tool holder section
Piston cylinder
Tool holder section
Inner housing
Plastic
hammer
Inner housing
Flat washer 28
Swash bearing section
Fig. 55
*Ball bearing 606ZZ
Swash bearing section
Fig. 54
(3) Remove stop ring E-4, flat washer 5 and compression spring 6 with which change plate is fixed, from the pin
of inner housing as illustrated in Fig. 56.
Piston cylinder
Stop ring E-4
Fat washer 5
Compression spring 6
Inner housing
Pin of inner housing
Change plate
Fig. 56
(4) Swash bearing section is held in inner housing with bearing retainer which is fastened with 2 pcs. of hex socket
head bolts M4x12. Take off these hex socket head bolts M4x12 for disassembling swash bearing section.
See Fig. 57.
Hex socket
head bolts M4x12
Fig. 57
(5) Bring piston cylinder to the dead point. And , twist the the swash bearing section, while pulling off them
from inner housing. Then swash bearing section and change plate can be removed from piston cylinder.
See Fig. 58.
Piston cylinder
Change plate
Fig. 58
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P 15 / 22
Repair
(6) Reassemble swash bearing section temporarily to gear housing, and hold gear housing as illustrated in Fig. 59.
So, swash bearing section tilts in the direction of arrow.
Keeping the illustrated position, remove swash bearing section by striking the edge of gear housing
with plastic hammer. So, ball bearing 606ZZ can be removed together with swash bearing section.
Fig. 59
(7) Swash bearing section can not be disassembled in one action by pressing cam shaft with arbor press, because
retaining ring S-7 is mounted between ball bearing 606ZZ and compression spring 7.
Take the following steps for disassembling swash bearing section.
1. Remove ring 8 by pressing cam shaft with arbor press as illustrated in Fig. 60.
2. Remove ball bearing 608ZZ with bearing extractor as illustrated in Fig. 61. Then flat washer 8 and bearing
retainer can be removed from cam shaft.
3. Remove helical gear 26 by pressing cam shaft with arbor press as illustrated in Fig. 62.
Bearing
retainer
1R236 Round bar
for arbor
1R236 Round bar
for arbor
Flat washer 8
Helical
gear 26
1R022 Bearing
extractor plate
Ring 8
Ring 8
Ball bearing
608ZZ
Helical
gear 26
1R023 Bearing
extractor ring
Fig. 62
Fig. 61
Fig. 60
4. Remove swash bearing 10 and clutch cam as illustrated in Fig. 63. And remove ball bearing 606ZZ
with bearing extractor as illustrated in Fig. 63.
5. Disassemble retaining ring S-7 with retaining ring plier as illustrated in Fig. 64.
6. Separated compression spring 7 and spur gear 10 from cam shaft as illustrated in Fig. 65.
Swash
bearing 10
Retaining ring S-7
Cam shaft
Clutch cam
Ball bearing
606ZZ
Spur gear 10
Compression
spring 7
Fig. 63
Fig. 64
Fig. 65
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P 16 / 22
Repair
< 15 > Assembling swash bearing section
(1) Apply grease to the parts of swash bearing section referring to "< 2 > Lubrication to the machine parts" in page 3.
(2) Assemble swash bearing 10 by pressing cam shaft with arbor press as illustrated in Fig. 66.
(3) Assemble helical gear 26 by pressing cam shaft with arbor press as illustrated in Fig. 67.
(4) Assemble flat washer 8, bearing retainer and ball bearing 608ZZ by pressing cam shaft with arbor press
as illustrated in Fig. 68.
(5) Assemble ring 8 by pressing cam shaft with arbor press as illustrated in Fig. 69.
Flat
washer 8
Cam shaft
Bearing
retainer
Helical
gear 26
Swash
bearing 10
Ring 8
Ball bearing
608ZZ
No.1R034
Bearing setting plate
Fig. 69
Fig. 66
Fig. 67
Fig. 68
< 16 > Assembling swash bearing section to piston cylinder
(1) Apply MAKITA grease to piston cylinder and swash bearing 10 referring to "< 2 > Lubrication to
the machine parts" in page 3.
(2) Mount 2 pcs. of flat washer 12 and piston joint to piston cylinder as illustrated in Fig. 70.
(3) Insert the above piston cylinder into inner housing as illustrated in Fig. 71.
(4) Bringing piston cylinder to the dead point for swash bearing 10, mount swash bearing 10 to piston cylinder by
inserting its pole into the hole of piston joint as illustrated in Fig. 72.
(5) Fasten bearing retainer which has been assembled to swash bearing section, with adhesive hex socket head
bolt M4x12, onto inner housing as illustrated in Fig. 73.
<Note> Do not fasten with the used hex socket head bolt M4x12. Always use the fresh adhesive
hex socket head bolt M4x12
Inner housing
Flat washer 12
Piston cylinder
Piston joint
Flat washer 12
Fig. 71
Fig. 70
2 pcs. of Hex socket
head bolts M4x12 for tightening
bearing retainer.
Piston cylinder
Fig. 72
Fig. 73
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P 17 / 22
Repair
(6) Set change plate in the groove of clutch cam, and assemble the clutch cam with change plate to cam shaft
as illustrated in Fig. 74.
(7) Assemble spur gear 10 to cam shaft as illustrated in Fig. 75.
(8) Assemble compression spring 7 to cam shaft, and secure the parts on cam shaft with retaining ring S-7 as illustrated
in Fig. 76.
(9) Assemble compression spring 6 and flat washer 5 to the pin of inner housing. And secure them with stop ring E-5
as illustrated in Fig. 77.
(10) Apply 55g of MAKITA grease RA No.1 in gear housing.
Change plate
Change plate
Spur gear 10
Clutch cam
Cam shaft
Fig. 74
Clutch cam
Fig. 75
Compression spring 6
Stop ring E-5
Flat washer 5
Change plate
Retaining
ring S-7
Spur gear 10
Compression spring 7
Clutch cam
Fig. 76
Fig. 77
< 17 > Removing needle bearing complete
Strike the work table with gear housing. Then needle bearing complete can be separated from gear housing
as illustrated in Fig. 78.
Needle bearing
complete
Fig. 78
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P 18 / 22
Repair
< 18 > Assembling needle bearing complete
1. Apply MAKITA grease RA No.1 to the inside of needle baring complete.
2. Putting needle bearing complete on No.1R165 "Ring spring setting tool B" press gear housing onto the needle
bearing complete with arbor press as illustrated in Fig. 79.
< Note in assembling >
Pay attention to the assembling position of needle bearing
complete.
The fat portion of needle bearing complete has to be faced
to the belly side of gear housing.
Back side
Gear housing
Back side
Needle bearing
complete.
Belly side
Needle bearing
complete
No.1R165
Ring spring setting tool B
Flat portion of
needle bearing complete
Belly side
Fig. 79
< 19 > Replacing electrical parts in handle
Disassemble handle cover by unscrewing 3 pcs. of tapping screws 4x25, and disassemble strain relief
by unscrewing 2 pcs. of tapping screws 4x18 as illustrated in Fig.80.
Then, switch, noise suppressor, power supply cord, etc. can be replaced.
Brush holder
Noise suppressor
Switch
Handle
cover
Tapping s
Brush holder
crew 4 x 25 : 3 pcs.
Cord guard
Tapping screw 4x18 : 2 pcs.
Power supply cord
Strain relief
Fig. 80
< 18 > Maintenance
It is recommended to change the following parts, when replacing carbon brushes. See Fig. 81.
O ring 12 O ring 15 O ring 9
Steel ball 7.0
O ring 16
Fig. 81
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P 19 / 22
Circuit diagram
Color index of lead wires
HR2450FT
Black
White
Red
Brush holder
Blue
Brush holder
Clear
Connected
to field ore
Field
3
1
2
4
Switch
M1
C1
C2
M2
1
2
Power supply cord
Light circiut
Blue or red
Noise suppressor
For some countries, noise
suppressor of two lead wire
type is used, or noise suppressor
is not used.
LED job light
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P 20 / 22
Wiring diagram
HR2450FT
Fix field lead wire (black)
with lead holder as per
the illustration.
Fix field lead wire (black)
with lead holder as per
the illustration.
Fix noise suppressor's
lead wire (clear) with
lead holder as per the
illustration.
Fix brush holder's
lead wire (blue) and
field lead wire (black)
with lead holder as per
the illustration.
* Pass brush holder's lead wire (blue)
under the field lead wire (black).
* Do not slack brush holder's lead
wire (blue) between brush holder and
lead holder.
Fix brush holder's
lead wire (red) and
field lead wire (white)
with lead holder as per
the illustration.
* Do not slack brush holder's lead
wire (red) between brush holder and
lead holder.
Fix the following lead wires with this
lead holder.
* Brush holder's lead wire (red)
* 2 field's lead wires (black)
* Noise suppressor's lead wire (clear)
Fix field brush holder's
lead wire (blue) and
field lead wire (black)
with lead holder as per
the illustration.
Noise suppressor
Noise suppressor is not
used in some countries
Fix lead wires which are passed
through this area, with any of
these lead holders.
LED circuit
Noise suppressor
LED circuit
Bottom view
of handle portion
LED lead wires
(blue or red)
LED
job-light
Lead wires of power supply cord,
and grounding lead wire (clear)
Pass LED lead wires, lead wires of power supply
cord and grounding lead wire as illustrated
above.
Fix lead wire (white) of
LED job-light with
lead holder as illustrated.
LED
job-light
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P 21 / 22
Circuit diagram
Color index of lead wires
HR2450T
Black
White
Red
Blue
Clear
Brush holder
Brush holder
Connected
to field ore
Field
3
1
2
4
Switch
M1
C1
C2
M2
1
2
Power supply cord
Noise suppressor
For some countries, noise
suppressor of two lead wire
type is used, or noise suppressor
is not used.
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P 22 / 22
Wiring diagram
HR2450T
Fix field lead wire (black)
with lead holder as per
the illustration.
Fix field lead wire (black)
with lead holder as per
the illustration.
Fix noise suppressor's
lead wire (clear) with
lead holder as per the
illustration.
Fix brush holder's
lead wire (blue) and
field lead wire (black)
with lead holder as per
the illustration.
* Pass brush holder's lead wire (blue)
under the field lead wire (black).
* Do not slack brush holder's lead
wire (blue) between brush holder and
lead holder.
Fix brush holder's
lead wire (red) and
field lead wire (white)
with lead holder as per
the illustration.
* Do not slack brush holder's lead
wire (red) between brush holder and
lead holder.
Fix the following lead wires with this
lead holder.
* Put the brush holder lead wire (red)
under the field lead wire (white).
* Brush holder's lead wire (red)
* 2 field's lead wires (black)
* Noise suppressor's lead wire (clear)
Fix field brush holder's
lead wire (blue) and
field lead wire (black)
with lead holder as per
the illustration.
Noise suppressor
Noise suppressor is not
used in some countries
Fix lead wires which are passed
through this area, with any of
these lead holders.
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