Makita HR2300 Manual

Model No.
Description
PRODUCT
CONCEPT AND MAIN APPLICATIONS
Specification
Dimensions: mm (")
Width (W)
Height (H)
Length (L) 356 (14) 380 (15)
77 (3)
HR2300 HR2310T
209 (8-1/4)
HR2300
HR2310T
Rotary Hammer 23mm (7/8")
Combination Hammer 23mm (7/8")
HR2300 is a 23mm (7/8") 2-mode rotary hammer while HR2310T is
a 23mm (7/8") 3-mode combination hammer with quick change drill chuck.
Both models are adapted for SDS-PLUS bits, featuring compact and
lightweight design, enhanced comfort and better control with ergonomic handle.
HR2300 series models are available in the variations listed below, including
HR2600 and HR2610 series models developed on the same concept.
For information of HR2600 and HR2610 series models,
see “TECHNICAL INFORMATION” of each series.
P 1/ 23
Chuck type
HR2300 HR2310T
Yes (by trigger)
Yes
Europe, North America: 4.0 (13.1), Australia, Brazil: 2.0 (6.6),
Other countries: 2.5 (8.2)
Yes
0 - 1,200
0 - 4,600
Adapted for
SDS-PLUS shank bits
Adapted for SDS-PLUS shank bits
and Round shank bits*1
23 (7/8)
68 (2-11/16)
2.9 (6.3)
Impacts per minute= minֿ¹
No load speed: minֿ¹= rpm
Specification
Double insulation
Power supply cord: m (ft)
Variable speed control
Rotation reversing facility
2.7 (5.9)
Operation mode 2 modes
(Rotation only/ Rotation with Hammering)
3 modes
(Rotation only/ Rotation with Hammering/
Hammering only)
Model
*1 Round shank bits can also be used by replacing the factory-mounted chuck with Quick change drill chuck (keyless).
*2 with side grip
Concrete
TCT bit
Steel
Wood
Core bit
Diamond core bit
Capacities:
mm (")
Continuous Rating (W)
Voltage (V) Cycle (Hz) Input Output Max. Output (W)
110
120
220
230
240
6.9
6.2
3.4
3.3
3.2
50/ 60
50/ 60
50/ 60
50/ 60
50/ 60
720
---
720
720
720
300
300
300
300
300
500
500
500
500
500
127 6.0 50/ 60 720 300 500
Current (A)
70 (2-3/4)
13 (1/2)
32 (1-1/4)
YesTorque limiter
Model Operation Mode LED Chuck type
2 modes
(Rotation only/
Rotation with hammering)
3 modes
(Rotation only/
Rotation with hammering/
Hammering only)
No
No
26mm
Capacity
23mm
23mm
26mm
No
No Adapted for
SDS-PLUS shank bits
Adapted for
SDS-PLUS shank bits
and Round shank bits*
Yes
No
AV T
No
No
No
Yes
Yes
NoNo
Yes
Yes
No
HR2300
HR2310T
HR2610T
HR2611FT
HR2600
HR2601
HR2611F
HR2610
*Round shank bits can also be used by
replacing the factory-mounted chuck with
Quick change drill chuck (keyless).
TECHNICAL INFORMATION
H
W
L
Weight according to
EPTA-Procedure 01/2003*2: kg (lbs)
(The image above
is HR2300.)

Standard equipment
Note: The standard equipment for the tool shown above may vary by country.
Depth gauge .............................................. 1
Side grip ................................................ 1
Dust cup set ............................................... 1 (HR2300 for some countries only)
Quick change drill chuck (keyless) ........... 1 (HR2310T only)
Carrying case ............................................ 1 (plastic or aluminum)
Optional accessories
SDS-PLUS shank TCT hammer drill bits
Taper shank TCT hammer drill bits
Taper shank adaptor
Cotter
Core bits
Center bits
Core bit adaptor
Rod
Drill chuck ass'y
Chuck adapter assembly
Drill chuck S13
Chuck key S13
Tool holder set
Scraper assembly
Waterproof cover
Quick change drill chuck (keyless)
Dust cups 5 and 9
Hose
Joint 25
Dust cup set
Plastic carrying case
Hammer grease (30g)
Bit grease
Depth gauge
Blow out bulb
Safety goggles
Bull points
Cold chisels
Scaling chisels
Grooving chisels
Hammer service kit
P 2/ 23

Features and benefits
*The same advantages as HR2470 series models
40 Different bit-angle settings *
The bit-angle is adjustable
without chisel adapter.
Increased repairabilityIncreased repairabilityLess bit wobbling
compared with HR2470 series models The repairability of clutch cam is
drastically increased by simplifying
the mechanism of operation mode change.
High durability *
ergonomically designed to:
• give maximum power thrust.
• provide a sure and comfortable
grip in any operation; overhead
application, drilling with palm-up
or palm-down grip.
Easy-to-grip handle
Quick change drill chuck (keyless)
(HR2310T only)
*
*
Torque limiter
One-touch sliding chuck
for easy bit change
*
Redesigned accessories
obtained by making bit guide portion
9mm longer than that of the current models
Easy depth adjustment
Depth gauge can be adjusted
with a single motion.
Rubberized soft grip
provides enhanced comfort and control.
*
Plastic carrying case
Large carrying handle
Large latches
• Easy to transport with large carrying handle
• Easy to open with large latches
• Stackable with other plastic carrying cases
of the same size or different size
Dust cup
Higher visibility of the bit tip
obtained by transparent cup mouth
Connectable with the hose of
Makita vacuum cleaner without joint parts
• With Makita vacuum cleaner, this dust cup can efficiently
extract dust and debris in a wide range of drilling operations;
from overhead to vertical downward applications.
• Also can be used like the current dust cup by plugging
the suction port.
Compact and Lightweight design
obtained by minimizing motor weight,
with a newly designed tool-structure
Operation mode change lever
positioned on the bottom of gear housing
for reduced possibility of breakage
P 3/ 23

Comparison of products
P 4/ 23
Performance Comparison
Makita HR2300
Makita HR2230
BOSCH GBH2-23RE
HILTI TE2
[diameter: ø6.5mm (1/4")]
0 50 100 150
110
slow fast
[diameter: ø10.5mm (5/16")]
0 50 100 150
120
slow fast
Makita HR2300
Makita HR2230
BOSCH GBH2-23RE
HILTI TE2
[diameter: ø12.5mm (1/2")]
0 50 100 150
slow fast
[diameter: ø16.5mm (5/8")]
0 50 100 150
115
slow fast
Note: 1. The test results depend to a great extent on the hardness of materials, etc.
2. Numbers in the chart below are relative values when the capacities of HR2230 are indexed at 100.
Test conditions: Drilled holes to a depth of 40mm (1-9/16") using ø1.5mm² x 50m cord reel.
Test material: Concrete with compressive strength of 40N/mm²
100
80
100
100
80
80
HITACHI DH22PB 110 105
100
85
75
100
80
95
HITACHI DH22PB 100 125
Drilling
[Work speed] [Work speed]
110

Vibration: m/s²
Noise: dB(A)
Impact energy (EPTA): J Impact energy*1: J
2.3
90/ 91
15.5
HR2310THR2300
Yes Yes
4.0 (13.1)*4
720
2.7 (5.9) 2.6 (5.8)
Continuous rating input: W Specification
Chuck type Adapted for
SDS-PLUS shank bits
Weight according to EPTA- Procedure 01/2003*5: kg(lbs)
Power supply cord: m (ft) Variable speed control Rotation reversing facility Job light
Rated amperage for North America: A
0 - 1,200 0 - 4,600
Impacts per minute= minֿ¹
No load speed: minֿ¹= rpm
Operation mode: R= Rotation only R+H= Rotation with Hammering H= Hammering only
23 (7/8) 13 (1/2)
32 (1-1/4)
Concrete
TCT bit
Steel Wood
68 (2-11/16)
70 (2-3/4)
Core bit Diamond core bit
Dimensions: mm (")
380 (15)356 (14)
Height
77 (3)
209 (8-1/4)
2.2
89
15.0
HR2230 HR2020/ HR2021/ HR2022
Yes Yes
4.0 (13.1)
710
N/A N/A
N/A 5.4
unknown
0 - 1,050 0 - 4,050
22 (7/8) 13 (1/2)
32 (1-1/4) 54 (2-1/8)
65 (2-9/16)
357 (14)
84 (3-5/16) 214 (8-3/8)
unknown unknown
90 (92*3)
16 (15.0*3)
DH22PB
Yes
620
No
0 - 1,050 0 - 4,400
22 (7/8) 13 (1/2)
32 (1-1/4)
50 (2)
65 (2-9/16)
89 (89*3)
13.5 (15.0*3)
TE2
Makita BOSCH HITACHI HILTI
Yes Yes
4.0 (13.1)
650
No
unknown
0 - 1,200 0 - 4,600
22 (7/8) 13 (1/2)
20 (13/16)
unknown
352 (13-7/8)
89 (3-1/2)
203 (8)
Width Length
Model
unknown
90 (89*3)
16 (16.0*3)
GBH2-23RE/ GBH2-22RE/
GBH2-22E
Yes/ Yes/ No
Yes Yes
5.0 (16.4)
650/ 620/ 620
2.5 (5.6)
5.0 (16.4)
2.6 (5.7) 2.5 (5.6)
No
No No
2.6 (5.7)
2.0
2.6 2.3 2.2 1.82.5/ 2.2/ 2.22.2
87
15.5
Yes/ Yes/ No
Yes/ No/ No
4.0 (13.1)
710
N/A
0 - 1,050/ 0 - 1,050/ 1,050 0 - 4,050/ 0 - 4,050/ 4,050
20 (13/16)
13 (1/2)
32 (1-1/4) 54 (2-1/8)
65 (2-9/16)
352 (13-7/8)
80 (3-1/8)
204 (8)
No
0 - 1,000 0 - 4,400
23/ 22/ 22 (7/8)
13 (1/2)
30 (1-3/16)
68 (2-11/16)
65 (2-9/16)
342 (13-1/2)
YesNo
Quick change drill chuck No
80 (3-1/8)
210 (8-1/4)
351 (13-3/4)
70 (2-3/4)
198 (7-3/4)
Adapted for
SDS-PLUS shank bits
Adapted for
SDS-PLUS shank bits
and Round shank bits*2
2.9 (6.3)
2 modes
(R/ R+H)
2 modes
(R/ R+H)
3 modes
(R/ R+H/ H)
*1 Measured according to our conventional reference, *2 Round shank bits can also be used by replacing the factory-mounted chuck with Quick change drill chuck (keyless).
*3 Actually measured value, *4 Europe, North America: 4.0 (13.1); Australia, Brazil: 2.0 (6.6); Other countries: 2.5 (8.2), *5 with side grip.
Capacities:
mm (")
Specification Comparison
Comparison of products
P 5/ 23

[1] NECESSARY REPAIRING TOOLS
Repair
DescriptionCode No. Use for
Retaining ring S pliers ST-2N
Retaining ring S pliers ST-2
1R003 removing Ring spring 14 and 15 from Tool holder complete for HR2300/
Ring spring 19 from Tool holder for HR2310T
removing Ring spring 21 from Tool holder for HR2310T
Bearing setting pipe 16-8.21R026 assembling Bearing box
1R004
Bearing setting plate 8.21R032 assembling Helical gear 26 for HR2310T
assembling Helical gear 26 for HR2300Bearing setting plate 10.21R033
removing Helical gear 26 for HR2300Bearing setting plate 15.21R035
removing/ assembling Spiro lock washer 30Gear extractor (large)1R045
removing Helical gear 26 for HR2310TBearing setting plate 12.21R034
Tip for retaining ring pliers1R212 Use with 1R003
1/4" Hex. shank bit for M41R228 removing M4 Hex socket head bolt
Ring spring setting tool A1R164 assembling Oil seal 25
Bearing setting pipe 20-12.21R028 assembling Helical gear 26
Pipe 301R232 assembling Oil seal 25
Round bar for arbor 30-1001R252 removing Oil seal 25
V block1R258 assembling Oil seal 25
Bearing extractor1R269 removing Ball bearing 6000LLB / 627DDW
Ring spring 26 setting tool B1R273 removing Cup sleeve / Ball bearing 6806LLU
Round bar for arbor 7-501R281 removing Helical gear 26
Jig for Spiro lock washer 1R369 removing/ assembling Spiro lock washer 30
Ring spring extractor 1R388 removing Ring spring 28
P 6/ 23
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.

Repair P 7/ 23
Apply the following grease/ lubricant to protect parts and product from unusual abrasion.
[2] LUBRICATION (for HR2300)
Fig. 1
Item No. Description Grease/ Lubricant AmountPortion to lubricate
Makita grease RB No. 00
Makita lubricating oil VG100
Makita lubricating
oil VG100
Makita grease RB
No. 00
26
1 Cap 35
Gear housing complete Oil seal 25 on the inside of Gear housing complete
Lip portion where Bit is to be inserted
Entire surface
Entire surface
Entire surface
(h) Ball bearing portion
(g) Interleaved portion to Piston joint
Entire surface
Gear portion
2g
3g
3g
3g
19g
in total
29
Steel ball 7.0 (2 pcs.)
Whole portion
(c) (d)
(a)
(b)
(e)
(f)
(g)
(h)
Portion that contacts Sleeve 9
32
28
a little
a little
a little
a little
42
44
45
46
47
56
58
64
65
70
71
30
Driving flange
O ring 9
Tool holder complete
HR2300
20
21
23
26
28
29
30
38
42
36
Pin 6
Piston
joint
44 45
46
47
56
58
64 65
70
1
71
37
32
30
Portion that contacts Spur gear 51/ Pins 6
30
Portion that contacts Spur gear 51/ Pins 6
16
(e) Gear portion
(f) Portion that contacts 58 Swash bearing 10
Gear portion that engages with Armature gear shaft
Inside that contacts 48 Piston joint
38 Impact bolt Entire surface
37 Sleeve 9A Entire surface
(b) Inside where 46 Piston cylinder reciprocates
16
20
21
Push corn Portion that contacts Clutch cam B
Compression spring 5 Periphery
23 O ring 21
Striker
O ring 17.5
Piston cylinder (c) Inside where 44 Striker moves
(d) Periphery that 28 Tool holder complete contacts
Guide plate
Spur gear 10
Clutch cam B
Swash bearing 10
Helical gear 26
O-ring 68
O ring 26
Oil seal 12
Flat washer 30
36 Portion that contacts Inner housing complete
Flat washer 30
Spur gear 51
(a) Periphery that contacts Driving flange / Spur gear 51

P 8/ 23
[2] LUBRICATION (for HR2310T)
20
21
23
16
(c)
(a)
(b)
(d) (e)
(f)
Piston
joint
45
46
47
44
38
42
56
Clutch cam A
Quick change drill chuck
Steel ball 6 (2 pcs.) Steel ball 5
58
64
65
55
70
71
109
114
Fig. 2
Item No. Description Grease/ Lubricant AmountPortion to lubricate
Makita grease RB No. 00
Makita lubricating oil VG100
Makita lubricating
oil VG100
Makita grease
RB No. 00
105 Cap 35
Gear housing complete Oil seal 25 on the inside of Gear housing complete
Lip portion where Bit is to be inserted
Entire surface
Entire surface
Entire surface
(h) Ball bearing portion
(g) Pole portion to be inserted into Piston joint
Entire surface
Gear portion
2g
3g
3g
3g
19g
in total
29
Steel ball 7.0
Whole portion
Portion that contacts Sleeve 9
36
28
a little
a little
a little
a little
42
44
45
46
47
55
58
64
65
70
71
30
Driving flange
O ring 9
Tool holder guide
complete
HR2310T
Sleeve 9
29
30 Pin 6
32
36
30
Portion that contacts Spur gear 51/ Pins 6 (6 pcs.)
30
Portion that contacts Spur gear 51/ Pins 6 (6 pcs.)
Portion that contacts Inner housing complete
28
(f) Portion that contacts 58 Swash bearing 10
Gear portion that engages with Armature gear shaft
Inside that contacts Piston joint
32
38 Impact bolt Entire surface
Entire surface
(b) Inside where 46 Piston cylinder reciprocates
105
109
Entire surface
Entire surface
Steel ball 6 (2 pcs)
Steel ball 5
/ ---
---
114
16
20
21
Push corn Portion that contacts Clutch cam A
Compression spring 5 Periphery
23 O ring 21
Striker
O ring 17.5
Piston cylinder (c) Inside where 44 Striker moves
(d) Periphery that 28 Tool holder guide complete contacts
Guide plate
Cam unit
Swash bearing 10
Helical gear 26
O-ring 68
O ring 26
Oil seal 12
Flat washer 30
Flat washer 30
Spur gear 51
(g)
(h)
(a) Periphery that contacts 29 Driving flange / 30 Spur gear 51
(e) Gear portion that engages 55 Cam shaft
37
37 Sleeve 9B

Repair
P 9/ 23
[3] DISASSEMBLY/ASSEMBLY
[3]-1A. Bit holder section for HR2300
Chuck cover
Chuck cover
Chuck coverCap 35
Groove of
Tool holder
complete
Tool holder
complete
DISASSEMBLING
(1) Remove Cap 35.
(2) Separate Ring spring 14 from the groove of Tool holder complete using
1R003 with 1R212. (Fig. 3)
Washer 16 on Ring spring 15 is removed.
(3) Remove Ring spring 15 in the same way while pressing down Chuck cover.
(Fig. 4) Then pick up Flat washer 17 and Rubber washer 16
from the space between Chuck cover and Tool holder complete.
Chuck cover is removed.
(4) Remove two Steel balls 7.0 while pressing down Ring 21. (Fig. 5)
Ring 21, Guide washer and Conical compression spring 21-29 are removed.
Fig. 3
Fig. 4
Fig. 6
Fig. 5
ASSEMBLING
Assemble in the reverse order of disassembly. Refer to Fig. 6 for the directions of the components.
Cap 35
Ring spring 14
(black)
Ring spring 14
(black)
Ring spring 15
(silver)
Ring spring 15
(silver)
Flat washer 17
1R003
1R212
Ring 21
Ring 21
Guide washer
Guide washerWasher 16
chamfered
portion
Conical compression
spring 21-29
Conical compression
spring 21-29
Steel ball 7.0
(2 pcs.)
chamfered
portion
concave
side
Steel ball
7.0 (2 pcs.)
Flat washer 17 Rubber
washer 16
convex
side
flat side

P 10/ 23
[3] DISASSEMBLY/ASSEMBLY
[3]-1B. Holder section for Drill chuck for HR2310T
DISASSEMBLING
(1) Remove Tool holder set from Tool holder guide complete. (Fig. 7)
(2) Remove Cap 35, then separate Ring spring 19 from the groove of Tool holder using 1R003 with 1R212. (Fig. 8)
(3) Remove Chuck cover, then remove Steel ball 7.0 while pressing down Stopper. (Fig. 9)
Stopper, Guide washer, Conical compression spring 21-29 and Flat washer 21 are removed. (Fig. 10)
(4) Remove Ring spring 21 with 1R004 from Tool holder guide complete side.
Flat washer 24, Leaf spring and Steel ball 5 are removed. (Fig. 11)
(5) Remove two Steel balls 6, Torsion spring 31and Change ring from Tool holder.(Fig. 12)
Fig. 7
Chuck cover
Steel ball 7.0
Stopper
Chuck cover Groove of
Tool holder
Cap 35
Ring spring 19
1R003
1R212
Torsion spring 31
Change ring
Steel ball 6
(2 pcs.)
Tool holder
Change cover
Fig. 10 Fig. 12Fig. 11
Fig. 8 Fig. 9
Repair
Tool holder
Tool holder
guide
complete
side
Stopper
Guide washer
Tool holder
Flat washer 21
Conical
compression
spring 21-29
Ring spring 21
Flat washer 24
Leaf spring
Steel ball 5
Tool holder guide
complete
Tool holder set
Tool holder set

P 11/ 23
[3] DISASSEMBLY/ASSEMBLY
[3]-1B. Bit holder section for HR2310T (cont.)
ASSEMBLING
Repair
(1) Assemble Torsion spring 31 to Tool holder as follows:
• Set two Steel balls 6 on the holes of Tool holder.
• Insert the short arm of Torsion spring 31 into the hole of Tool holder.
Note: Apply Makita grease No. RB No. 00 to two Steel balls 6 to prevent
them from falling. (Fig. 13)
(2) Assemble Change ring to Change cover. (Fig. 14)
(3) Assemble Tool holder to Change cover. (Fig. 15)
Fig. 13
a
Note:
Face the chamfered end
of the hole upward.
Align the hole of
Change ring with
that of Change cover.
a'
[Section a - a']
(4) Put Steel ball 5.0 in the groove surrounded by Change cover and Tool holder. (left in Fig. 16)
(5) Set Leaf spring and Flat washer 24 in change cover, then secure them with Ring spring 21. (right in Fig. 16)
(6) As for Cap 35 side, assemble the components in the reverse order of disassembly. Refer to the previous page.
Fig. 14 Fig. 15
Change ring
Change cover
Change cover
Change ring
By turning Tool holder
approx. 75
° clockwise,
Tool holder can be fastened
to Change cover.
Tool holder
75
°
Insert the long arm of
Torsion spring 31 into
the hole of Change cover
through the hole of
Change ring.
Flat washer 24
Leaf spring
Fig. 16
long arm of
Torsion spring 31
Change cover
Steel ball 6 (2pcs.)
Tool holder
long arm
Torsion spring 31
short arm
Steel ball 5.0
Tool holder
Change cover
Ring spring 21

P 12/ 23
[3] DISASSEMBLY/ASSEMBLY
[3]-2. Drill chuck assembly for HR2310T
Repair
DISASSEMBLING
Fig. 17 Fig. 18
Fig. 21Fig. 20Fig. 19
Steel ball 5.0
Leaf spring
Flat washer 24
Drill chuck assembly can be disassembled as drawn in Figs. 17 to 21.
Change cover
Change ring
After Removing Ring spring 21, strike Drill chuck assembly against
workbench which is covered with a cloth as a cushion.
Flat washer 24, Leaf spring and Steel ball 5.0 can be removed.
Pull off Change cover.
Change ring and Torsion spring 31
can be removed.
Torsion spring 31
Chuck holder
Spacer
Chuck holder
Chuck holder
Chuck holder
Spacer
Remove Spacer and
two Steel balls 6
from Chuck holder.
Clamp the flats of Chuck holder in vise,
then unscrew M6x22 Flat head screw
by turning it clockwise using Impact driver.
Clamp the flats of Chuck holder in vise,
then separate Drill chuck from Chuck
holder by turning it counterclockwise
using Hex wrench 10.
Steel ball 6
(2 pcs.)
M6x22
Flat head screw
Hex wrench 10
Ring
spring 21
1R003
1R212

P 13/ 23
[3] DISASSEMBLY/ASSEMBLY
[3]-2. Drill chuck assembly for HR2310T (cont.)
Repair
Change cover
Change ring
ASSEMBLING
Chuck holder
short arm of
Torsion spring 31
long arm of
Torsion spring 31
hole for
Torsion spring 31
(1) Holding Chuck holder's flat portions in vise, assemble Drill chuck to Chuck holder by turning it clockwise
using Hex wrench 10.
(2) Secure Drill chuck with M6x22 Flat head screw by turning it counterclockwise using Impact driver.
(3) Assemble Drill chuck to Spacer. (Fig. 22) Then mount two Steel balls 6. (Fig. 23)
(4) Mount Torsion spring 31. Then assemble Drill chuck to Change cover. (Fig. 24)
(5) Mount Steel ball 5, Leaf spring and Flat washer 24 to Chuck holder, then secure them with Ring spring 21. (Fig. 25)
Spacer
Spacer
Spacer
Insert the short arm of Torsion
spring 31 into the hole of
Chuck holder using pliers.
Fitting Chuck holder's
flat portions to Spacer,
mount Drill chuck to Spacer.
Fig. 22 Fig. 23
Chuck holder
Steel ball 6 (2 pcs.)
Note: Apply Makita grease RB No.00 to Steel
balls 6 to protect them from falling off.
Fig. 25
Fig. 24
By turning Drill chuck
approx. 75
° clockwise,
Drill chuck can be
fastened to Change cover.
Drill
chuck
75
°
Ring spring 21
Steel ball 5
Flat washer 24
Leaf spring
Change
cover
Torsion spring 31
Insert the long arm of Torsion spring 31
into the hole of Change cover through
the hole of Change ring, then assemble
Change ring to Change cover. (See Fig. 6.)
Chuck holder

P 14/ 23
[3] DISASSEMBLY/ASSEMBLY
[3]-3. Change lever section
Repair
DISASSEMBLING
ASSEMBLING (HR2300)
ASSEMBLING (HR2310T)
Insert the tip of thin slot screwdriver into the notch of Gear housing,
then lever up one side of Change lever cover. (Fig. 26)
Lever up the other side of Change lever cover in the same way,
then remove Change lever cover. Change lever can be removed.
(1) Set Change lever B to 45 ° position as drawn in Fig. 27.
(2) While checking the V-edge of Push corn fits into V-groove of Clutch cam B, insert Change lever B into Gear housing.
(3) After turning Change lever B to hammer drill mode position, put Change lever cover B on Change lever B.
Note: The V-groove of Change lever B has to come on the center of Leaf spring. (Fig. 28)
(4) Be sure to check Change lever B works properly after assembling.
(1) Set Change lever A to hammer mode as drawn in Fig. 29.
(2) While checking the V-edge of Push corn fits into V-groove of Catch cam A, insert Change lever A into Gear housing.
Note: The V-groove of Change lever A has to come on the center of Leaf spring. (Fig. 28)
(4) Be sure to check Change lever A works properly after assembling.
Fig. 29
Fig. 27 Fig. 28
Fig. 26
notch of Gear housing
Change lever
(A for HR2310T) /
B for HR2300)
Change lever B
V-groove of
Change lever B
Change lever cover
(A for HR2310T) /
B for HR2300)
Change lever A
center of Leaf spring
V-groove of
Clutch cam B
45
°
Fig. 30
center of Leaf spring
V-groove of
Clutch cam A
V-groove of
Change lever A

P 15/ 23
[3] DISASSEMBLY/ASSEMBLY
[3]-4. Armature
Repair
REPLACING
(1) Remove three 4x18 Tapping screws and Handle cover.
(2) Slide Brush holder unit to the best position to repair, and move the arms of Spiral springs aside, then separate Carbon
brushes from Commutator. (Fig. 31)
(3) Remove four 4x30 Tapping screws, then separate Motor housing from Gear housing complete. Armature is left on
Gear housing at that time. (Fig. 32)
Note: Do not lose Wave washer 15 on the bottom of Motor housing. Do not fail to set it in place when assembling.
(4) Remove Armature ass’y from Gear housing complete by pulling by hand.
Note: Ball bearing 6000LLB of Armature ass’y is held in Inner housing complete with O ring 26. Therefore, it is not
necessary to tap Gear housing complete with Plastic hammer to remove Armature ass’y.
(5) Remove Ball bearings 6000LLB with 1R269.
Remove 627DDW and Insulation washer together at one time with 1R269.
(6) Assemble the components in the reverse order of disassembly after replacing the damaged parts.
(1) Remove Bit holder section (HR2300) / Holder section (HR2310T).
(2) Remove Change lever section.
(3) Separate Gear housing from Motor housing.
(4) Remove Tool holder complete (HR2300) / Tool holder guide complete (HR2310T)
by tapping the top as drawn in Fig. 33.
Note: Flat washer 30 is located between Tool holder (guide) complete and
Inner housing complete. Be careful.
(5) Set 1R045 and 1R369 to Tool holder (guide) complete. (Fig. 34)
(6) Compress Compression spring 32 (Fig. 35), then separate Spiro lock washer 30 from
Tool holder (guide) complete by sliding a thin slotted screwdriver from the upper end
as drawn in Fig. 36. The components are disassembled. (Fig. 37)
Fig. 31
Fig. 35Fig. 34 Fig. 36
Fig. 37
Fig. 32
Fig. 33
Insulation washer
spiral spring of
Brush holder unit
Gear housing
Motor housing
4x30 Tapping screw
(4 pcs.)
Ball bearing 627DDW
Wave washer 15
Gear housing
complete
Ball bearing 6000LLB held with O ring 26 in Inner housing
Spiro lock washer 30
Tool holder
(guide)
complete
Steel ball 4
(4 pcs.)
Pin 6
(6 pcs.)
Driving flange Compression spring 31
Tool holder
(guide) complete
[3]-5. Torque limiter section
Spur gear 51
1R045
Compression spring 31
1R369
Tool holder (guide) complete
1R369
1R369
Upper end of
Spiro lock
washer 30
Flat washer 30 (thicker than the others) Flat washer 30 (thin)
thin
slotted
screwdriver

P 16/ 23
[3] DISASSEMBLY/ASSEMBLY
[3]-6. Impact bolt in Tool holder complete for HR2300/
Tool holder guide complete forHR2310T
Repair
DISASSEMBLING
(1) Put 1R388 into Tool holder (guide) complete, then push 1R388 in vise with the access holes on Tool holder (guide)
complete parallel to Vise. (Fig. 38)
O-ring case A (HR2300) / O-ring case B (HR2310T) is moved toward the top of Tool holder (guide) complete, and
therefore, Ring spring 28 can be relieved from O-ring case A/ B.
(2) When the end gap of Ring spring 28 is in the access hole, slide it with slotted screwdriver until it is completely hidden.
(3) Using slotted screwdriver, tap Ring spring 28 through the two access holes alternately to push it out of the inner groove
of Tool holder (guide) complete.
(4) The components are removed by tapping with Phillips screwdriver and plastic hammer from bit installation side of
Tool holder (guide) complete. (Fig. 39)
Fig. 38
Fig. 39
HR2300
Sleeve 9A Sleeve 9B
Inner
housing
complete
side
Inner
housing
complete
side
Bit
installation
side
Bit
installation
side
Impact bolt B
Cushion ring 12Cushion ring 12
O-ring case A O-ring case A
O ring 9O ring 9
Ring spring 28
Note: Refer to Fig. 40A/ 40B for the details.
Ring spring 28
Ring 10B
Ring 10A
Impact bolt A
HR2310T
slotted
screwdriver
Ring spring 28
90
°
1R388
Vise Vise
1R388 O-ring case A (HR2300) / B (HR2310T)
The directions of two access holes on Tool holder (guide)
complete have to be parallel to Vise.
holes on both side of Tool holder (guide)
complete to access inside
inner groove of Tool holder (guide) complete

P 17/ 23
Repair
Note: 2
ASSEMBLING
Fig. 40A
Cushion ring 12
Ring 10A O ring case A with
O ring 9 fit inside
Impact bolt A
(1) Assemble Impact bolt section to Tool holder (guide) complete as drawn in Fig. 40A/ 40B.
Tool holder complete
Impact bolt section in Tool holder complete for HR2300
Sleeve 9A
Bit
installation
side
Inner housing
complete side
ø9mm ø9.5mm
Fig. 41
Note: 1. Use an extra Piston cylinder as a jig. Never use Piston cylinder that is to be assembled to the machine.
2 The end gap of Ring spring 28 must not be located at the two holes of Tool holder (guide) complete.
(2) Push Ring spring 28 into the inner groove of Tool holder (guide) complete as drawn in Fig. 41.
Note: Do not reuse the removed Ring spring 28 if it is deformed or damaged.
Piston cylinder
as a jig Piston cylinder as a jig
Tool holder
(guide) complete
end gap
hole
Inner groove of
Tool holder (guide)
complete
Ring spring 28 O ring case A
(HR2300)
Note: These components
are directional.
hole
[3] DISASSEMBLY/ASSEMBLY
[3]-6. Impact bolt section in Tool holder complete for HR2300/
Tool holder guide complete for HR2310T (cont.)
[cross-sectional view]
Ring spring 28
Tool holder
(guide) complete
end gap
Ring spring 28
[Correct] [Wrong]
Note: 1
Fig. 40B
Cushion ring 12
Ring 10B O ring case A with
O ring 9 fit insideImpact bolt B
Tool holder guide complete
Impact bolt section in Tool holder guide complete for HR2310T
Sleeve 9B
Bit
installation
side
Inner housing
complete side
long short
Note: These components are
directional.
ø9mm
[cross-sectional view]

P 18/ 23
Repair
DISASSEMBLING Fig. 42
Fig. 43
Fig. 44
Fig. 45A
Fig. 45B
(1) Disassemble Motor housing section, Gear housing section and Inner housing section.
(2) Remove two M4x16 Hex socket head bolts with hex wrench 3 and 1R228. (Fig. 42)
Then pull Swash bearing section out of Inner housing complete. (Fig. 43)
(3) Remove Ball bearing 606ZZ from Gear housing complete using the removed Swash
bearing section. (Fig. 44)
(4A) Receive Clutch cam B on 1R035 and press out Spur gear 10 of HR2300.
The swash bearing section can be removed as drawn in Fig. 45A.
(4B) Remove Stop ring E-6 from Can shaft of HR2310T, then separate Flat washer 7,
Spur gear 10 and Clutch cam A from Can shaft.
Receive Swash bearing 10 on 1R034 and press out Cam shaft with Arbor press.
The swash bearing section can be removed as drawn in Fig. 45B.
Push Piston cylinder into Inner housing
complete to tilt Swash bearing 10.
Pull Swash bearing section horizontally
with Swash bearing 10 kept tilted, and
remove the pole of Swash bearing 10
toward the tilted direction.
Swash bearing section
(Note: Ball bearing 606ZZ is left in Gear housing complete.)
Swash bearing 10
[3] DISASSEMBLY/ASSEMBLY
[3]-7. Swash bearing section
M4x16 Hex socket
head bolt
(2 pcs.)
Note: These are thread locking
screws. Do not reuse
them without applying
ThreeBond 1321B/ 1342
or Loctite 242.
Inner housing complete
Insert the shaft* to the hole of
Ball bearing 606ZZ, and tilt it
back and forth.
* shaft portion of Spur gear 10
(for HR2300)
Cam shaft (for HR2310T)
Tap Gear housing complete with plastic hammer.
Ball bearing 606ZZ is removed together with
Swash bearing section.
Piston cylinder
Ball bearing 606ZZ
in Gear housing
complete Ball bearing 606ZZ
Stop ring E-6
Spur gear 10 Clutch cam B Swash bearing 10
Flat washer 7 Bearing retainer
Spur gear 10 Clutch cam A Swash bearing 10 Bearing box
Cam shaft Flat washer 8
Flat washer 8
HR2300 Swash bearing section
HR2310T Swash bearing section
Ball bearing 608ZZ
Helical
gear 26
Bearing retainerBearing box Ball bearing 608ZZ
Helical
gear 26

P 19/ 23
Repair
ASSEMBLING
Fig. 46
Fig. 47
(1) Pressfit Ball bearing 608ZZ into Bearing box.
(2A) Put Clutch cam B, Swash bearing 10, Flat washer 8 and Bearing box for HR2300 to Spur gear 10 in order,
then secure them using 1R033, 1R026 and arbor press.
(2B) Put Swash bearing 10, Flat washer 8 and Bearing box for HR2310T to Cam shaft in order, then secure them using
1R032, 1R026 and arbor press.
Assemble Flat washer 8, Clutch cam A and Spur gear 10 to Cam shaft, then fit Stop ring E-6 into the groove of Cam
shaft.
(3) Fit Bearing retainer in Bearing box, then pressfit Helical gear 26 to the shaft of Swash bearing section.
Be careful of the directions of Bearing box and Helical gear 26. (Fig. 46)
(1) Assemble Guide plate and Piston joint to Piston cylinder. Align the holes of Piston joint to the installed direction of
Swash bearing 10. (Fig. 47)
(2) Set Flat washer 14 and Compression spring 14 on the boss of Inner housing complete. (Fig. 47)
(3) Put the opposite end of Compression spring 14 on Guide plate, then push Piston cylinder into the bottom of Inner
housing complete, and insert the pole of Swash bearing 10. (Fig. 47)
(4) Assemble Striker with O ring 17.5 to Piston cylinder. Refer to Figs 1/ 2.
[3] DISASSEMBLY/ASSEMBLY
[3]-7. Swash bearing section (cont.)
The center is projected higher than that of the reverse.
Face the projection to Bearing retainer.
Bearing retainer
Bearing box with
Ball bearing 608ZZ
Turn the pole of
Swash bearing 10.
Guide plate
Helical gear 26
[3]-8. How to assembly of Piston cylinder section to Swash bearing section
the installed direction of
Swash bearing 10
Viewed from Swash bearing 10
installation side
Viewed from Swash bearing 10 side
The wrong installation causes the top of
Bearing retainer to bump against
Armature shaft.
Boss of Inner housing
complete
Compression spring 14
Guide plate
Flat
washer 14
Piston joint
Note: Air release hole on
Piston cylinder can be
positioned at either
side. (no fixed position)

P 20/ 23
Repair
Fig. 48
Fig. 49
Fig. 50 Fig. 51
(1) Check that Clutch cam B is engaged with Swash bearing 10. (Fig. 48)
(2) Assemble Gear housing complete to Inner housing complete.
(1) Check that Clutch cam A is engaged with Swash bearing 10. (Fig. 49)
(2) Assemble Compression spring 4 and Lock plate to Gear housing
complete. (Fig. 50)
Note: Apply grease to the end of Compression spring 4 on Lock plate
mating side in order to do the next step smoothly.
(3) While holding Lock plate by a finger so as not to drop from the guide
of Gear housing complete, Assemble Gear housing complete to
Inner housing complete. (Fig. 51)
[3] DISASSEMBLY/ASSEMBLY
[3]-9A. How to assemble Gear housing to Inner housing for HR2300
Check here.
[3]-9B. How to assemble Gear housing to Inner housing for HR2310T
Swash bearing 10
Swash bearing 10
Check here.
Compression spring 4
Lock plateguides of Gear housing
complete for Lock plate
Clutch
cam A
Clutch
cam B
Lock plate