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T ECHNICAL INFORMATION
Models No. HM1810
PRODUCT
P 1 / 21
H
Description Electric Breaker

CONCEPT AND MAIN APPLICATIONS
Model HM1810 has been developed as 28.6mm hex shank electric breaker W
conforming to the permissible noise level limit of 2006 stage of European L
Noise Directive for Outdoor Equipment.
Despite such low noise level, features highest-in-class chipping efficiency.
Also features unique Makita AVT (Anti-Vibration Technology), ensuring Dimensions: mm (")
incredibly low vibration.
Length (L) 824 (32-1/2)
Width (W) 146 (5-3/4)
Height (H) 633 (25)

Specification
Continuous Rating (W)
Voltage (V) Current (A) Cycle (Hz) Max. Output(W)
Input Output
110 16.0 50/60 1,700 950 2,300
120 15.0 AC/DC 1,700*1 950 2,300
220 9.6 50/60 2,000 1,240 2,500
230 9.2 50/60 2,000 1,240 2,500
240 8.8 50/60 2,000 1,240 2,500
*1: Continuous Rating Input: Taiwan=1,570W, UK (low voltage)=1,700W, Saudi Arabia (low voltage)=1,650W

Specification Model HM1810
Blows per min.: bpm=min-1 1,100
Shank: mm (") Hex 28.6 (1-1/8)
Impact energy: J (catalog value) 63
Anti-vibration Vibration absorbing handle No
technology Counterweight mechanism No
Permissible noise level limit*3 111
Noise*2:
Guaranteed noise level on the
dB(A) 107
catalog for European countries
Vibration*4: m/s2 8
Protection from electric shock Double insulation
Power supply cord: m (ft) 5.0 (16.4) [brazil only: 2.0m (6.6ft)]
Net weight: Kg (lbs) 32 (70.6)

*2: Noise indicates sound power level.
*3: This is the permissible noise level limit of 2006 stage of the "European Noise Directive for Outdoor
Equipment" (2000/14/EC). And in and after 2006, it will be prohibited in Europe to sell the products
with the sound power level exceeding this noise level limit.
The values of the permissible noise level limit listed above are calculated by us in accordance with the
directive. (The calculation is based on the weight of product.)
*4: Vibration level on the catalog for European countries

Standard equipment
Hex wrench 5 ................ 1 pc
Note: The standard equipment for the tool shown above may differ by country.

Optional accessories
Bull point Clay spade
Cold chisel Rammer
Scaling chisel
P 2 / 21
Features and benefits

Conforming to the permissible noise level limit of 2006 stage Highest-in-Class
of European Noise Directive for Outdoor Equipment Chipping efficiency
1
AC/DC Switch * Optimum for Rental Use
For North American 2
with the following features
countries only
1. Auto cut-off brushes for protecting
commutator *
AVT 5
2. Name plate placed in the position almost
(Anti-Vibration Technology) 3 free from damages and scratches *
3. Flat surface for ownership engraving or sticker
Counterweight mechanism ensures
4. Cylindrical tool holder with high reparability;
extra-low vibration i chiseling jobs.
new bolt holes can be drilled when the original
Rugged One bolt hole is clogged with broken bolt.
4
5. Warning lamp indicates trouble with cord.
Provides longer service life compared
with Makita HM1800 and Competitor's model A. *The same advantage as Model HM1800

Comparison of products
Specification Comparison Competitor's model A is the model for North American countries.
Model No. Makita Competitor A
Specifications HM1810 HM1800 Model A
Continuous rating input: W 2,000*1 1,700 1,900
Rated amperage for North America: A 15 15 15
Blow per min.: min-1=bpm 1,100 1,000 1,030
Great Britain 31.7(1-1/4)
Hex shank: mm (") 28.6(1-1/8) 28.6(1-1/8)
Other countries 28.6(1-1/8)
Angle settings of bit 6 6 6
Impact energy: J (catalog value) 63 36.4 60
Permissible noise level limit*3 111 108 108
Noise*2:
Guaranteed noise level on the
dB(A) 107 109 110
catalog for European countries
Vibration*4: m/s2 8 24 13
Anti-vibration Vibration absorbing handle No Yes Yes
technology Counterweight mechanism Yes No No
Warning lamp that indicates trouble with cord Yes No No
Auto cut-off brush Yes Yes Yes
Double insulation Yes Yes Yes
Length 824 (32-1/2) 818 (32-3/8) 753 (29-3/4)
Dimensions: mm (") Width 146 (5-3/4) 137 (5-3/8) 138 (5-7/16)
Height 633 (25) 624 (24-1/2) 596 (23-1/2)
Power supply cord: m (ft) 5.0 (16.4) 5.0 (16.4) 4.0 (13.1)
*1, *2, *3, *4:
Net weight: Kg (lbs) 32 (70.6) 29 (64) 29 (64) See page 1.
Performance Comparison
Note: Numbers in the chart on right are relative values when the capacity of Competitor's model A is indexed at 100.
[High Voltage (230V)] [Low Voltage (120V)]

Makita HM1810 114 127
Competitor's 100 100
model A
Makita HM1800 78 87
P 3 / 21
Repair
CAUTION: Disconnect the machine from the power source for safety before repair/maintenance!
[1] NECESSARY REPAIRING TOOLS
Code No. Description Use for
1R005 Retaining Ring R Pliers RT-2N Removing Retaining ring R-80 from Crank box
1R023 Pipe Ring (for arbor press) Removing Helical gear 47
1R045 Gear extractor, large
1R346 Center Attachment for 1R045 Disassembling Tool retainer section
1R347 Jig for Tool Retainer Disassembling
1R348 Spring Pin Extractor Removing Spring pin 8-40 from Tool retainer shaft
1R231 1/4" Hex Shank Bit for M8 Loosening/ tightening Hex socket head bolt M8x75
1R263 Bearing Extractor
Removing Ball bearings
1R269 Bearing Extractor
1R291 Retaining Ring S and R Pliers Removing Retaining ring S-20 from Crank shaft
784408-3 Socket Bit 13-55 Loosening/ tightening Hex nut M8 that secures Fan 100

[2] ADHESIVE APPLICATION AND LUBRICATION
[2] -1. Adhesive Application
Apply an appropriate amount of adhesive to the following parts in order to lock them against vibration loosening or
leakage. Be sure to wipe off grease or oil from the parts before adhesive application.

Item No. Description Portion to apply adhesive
10 Brush holder cap (2pcs) Threaded portion
12 Hex socket head bolt M6x22 (4pcs) Threaded portion
16 Hex bolt M5x85 (2pcs) Threaded portion
22 Gear housing complete Figure 8 inlaid portion that contacts Gear housing cover
76 Hex socket head bolt M5x16 (2pcs) Threaded portion
83 Hex socket head bolt M12x55 (4pcs) Threaded portion
94 Hex socket head bolt M12x45 (4pcs) Threaded portion

Fig. 1
Bearing box
Crank housing 76
Motor housing B
: ThreeBond 1215
Plate
: ThreeBond 1321B or 1324, Field
or Loctite 242 12

10
16

22
Motor housing A
83
Gear housing cover
Barrel

Tool holder

94
P 4 / 21
Repair
[2] LUBRICATION
Apply Makita grease to the following portions designated with the black triangle and gray triangle to protect
parts and product from unusual abrasion.

Item No. Description Portion to lubricate
22 Gear housing complete approx. 80g of Makita grease N No.1 in the gear chambers
24 Spur gear 22 appropriate amount of Makita grease N No.1 to the teeth portion
31 Crank housing approx. 110g of Makita grease R No.00 in the crank room
35 Helical gear 50 appropriate amount of Makita grease N No.1 to the teeth portion
43 Spur gear 47 appropriate amount of Makita grease N No.1 to the teeth portion
52 Connecting rod appropriate amount of Makita grease R No.00 to the inside surface of the two holes
53 O ring 55 appropriate amount of Makita grease R No.00 to the whole portion
56, 58 O ring 52 appropriate amount of Makita grease R No.00 to the whole portion
57 Cylinder liner 62 approx. 10g of Makita grease R No.00 to the inside
61 Balancer complete appropriate amount of Makita grease R No.00 to the inside surface
64 Connecting rod appropriate amount of Makita grease R No.00 to the inside surface of the two holes
66 Crank box approx. 20g of Makita grease R No.00 to the rollers of Needle bearing
85 Cylinder B appropriate amount of Makita grease R No.00 to the inside surface
98 X ring 40 appropriate amount of Makita grease R No.00 to the whole portion
100 O ring 60 appropriate amount of Makita grease R No.00 to the whole portion

Fig. 2
Crank complete 66
: Makita grease N No.1 Crank complete
: Makita grease R No.00 31 52
64

61
24

Pin 15
35
43 Piston
53 85
56
Impact bolt holder
100

Impact bolt

98
57

Tool holder
58
Striker
P 5 / 21
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Disassembling/Assembling Motor Section
REMOVING FIELD
1) Remove Motor housing cover set. Fan 100 secured with Hex nut M8 will be now visible.
2) Remove the assembly of Rear cover and Handle (switch side), then Brush holder caps and Carbon brushes.
Important:
When unscrewing Brush holder caps, be careful not to break the screwdriver insertion slot because the adhesive-applied
Brush holder caps are secured tight.
3) Remove hex nut M8 by turning counterclockwise with Socket bit 13-55 (No.784408-3) and Impact driver.
Now Fan 100 can be separated from Armature shaft. (Fig. 3)
4) After unscrewing four M6x22 Hex socket had bolts, remove Bearing box from Crank housing using
Gear extractor, large (No.1R045). (Fig. 4)
Fig. 3 Fig. 4

Gear extractor, large
Socket Bit 13-55
(No.1R045)
(No.784408-3)

Hex socket head bolt
Fan 100 M6x22 (4pcs)

Bearing box

Crank housing
Bearing box

5) Pull off Motor housing B from Crank housing. Then remove Motor housing A from Crank housing by tapping the
edge of Crank housing with plastic hammer. (Fig. 5) Sometimes, when tapping Crank housing, Armature may be
removed from Crank housing before Motor housing A.
6) After unscrewing two M5x85 Hex bolts, remove Field by tapping the edge of Motor housing A with plastic hammer.
(Fig. 6)

Fig. 5 Fig. 6

Motor housing A Field Hex bolt M5x85

Crank housing Motor housing B

Motor housing A

Armature
P 6 / 21
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Disassembling/Assembling Motor Section (cont.)
INSTALLING FIELD
Do the reverse of the disassembling steps.
Important:
Field is not reversible when assembled into Motor housing A. Be sure to assemble so that the Lead wire side of the Field
is placed on the Motor housing B side as illustrated to left in Fig. 7.
It will be impossible to route the lead wires to Motor housing B if assembled as illustrated to right in Fig. 7.
Fig. 7

[Correct] [Wrong]
Motor housing B side Motor housing B side
Field
Motor housing A

Lead wire side Field lead wires
Field lead wires
Lead wire side

REMOVING ARMATURE Fig. 8
If Armature is not removed in removal of Field as described in 5) Gear housing cover
of "Removing Field", remove by following the steps described below:
1) Remove the parts of Fan 100 side (Fan 100, Bearing box and
Motor housing B). (See Figs. 3, 4, 5)
Note: It is not necessary to remove Motor housing A and Field.
Remove four M8x75 Hex socket head bolts with 1R231.
2) Remove Gear housing cover by raising with Slotted screwdriver and
Bearing extractor (No.1R263) as in Fig. 8.
Note: The two tools are necessary because Gear housing cover is
securely fastened to Gear housing using adhesive.
3) After removing the assembly of Helical gear 50 and Spur gear 22,
insert the arms of 1R045 through the opening of Gear housing.
Then grip the bearing chamber of Gear housing with the jaws of 1R045.
Now, by turning the handle of 1R045 clockwise, Armature can be
removed form Gear housing. (Fig. 9) Gear housing

Fig. 9

Assembly of
Helical gear 50 No.1R045
and Spur gear 22

Bearing chamber
of Gear housing Armature shaft Armature
P 7 / 21
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Disassembling/Assembling Gear Section
DISASSEMBLING
1) After separating Gear housing from Crank housing, remove Ball bearing 6302LLB with Gear extractor, large
(No.1R045). At this time, be careful not to lose Pin 5. Then using Retaining ring S and R pliers (No.1R291)
remove Retaining ring S-20. (Fig. 10)
2) Put Gear housing on Pipe Ring (No.1R023), and press down Crank shaft using arbor press. (Fig. 11)
3) Now Crank shaft complete, Spur gear 47 and Sleeve 25 can be removed from Gear housing. (Fig. 12)
Note: Be careful not to lose two woodruff keys.
Fig. 10 Fig. 11 Fig. 12

Spur gear 47
Ball bearing
6302LLB Arbor press Sleeve 25
Retaining
ring S-20 Crank shaft
complete
Gear housing

Woodruff key 4
Pipe Ring
(No.1R023)
Crank shaft complete

4) Two 6202 Ball bearings can be removed from the assembly Fig. 13
of Helical gear 50 and Spur gear 22 using Bearing extractors
Ball bearing 6202 Ball bearing 6202
(No.1R263) as illustrated in Fig. 13.
(on Helical gear 50 side) (on Spur gear 22 side)
5) As illustrated in Fig. 15, the assembly of Helical gear 50 and
Spur gear 22 can be disassembled using Pipe ring (No.1R023),
Round Bar for Arbor 14-100 (No.1R243), arbor press and
two appropriate steel plates.
Note: Be careful not to lose two Woodruff keys.

Helical gear 50 Spur gear 22
Bearing Extractor
(No.1R263)

Fig. 14

Arbor press Helical gear 50

Round bar
for arbor 14-100
(No.1R243 )

Spur gear 22
Metal plates
for supporting Gear
Woodruff key 4
Pipe Ring (No.1R023)
P 8 / 21
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Disassembling/Assembling Gear Section (cont.)
ASSEMBLING
1) After setting O ring 40, O ring 90 and Pin 4 in place on Gear housing complete, press-fit Crank shaft complete and
Armature onto Gear housing using arbor press as illustrated in Fig. 15.
2) Put Sleeve 25 through Crank shaft complete. Set woodruff keys onto the concaves of Crank shaft complete.
Mount Spur gear 47 to Crank shaft complete. After fixing Spur gear 47 with Retaining ring S-20, assemble Ball
bearing 6302LLB to Crank shaft complete. (Fig. 16)
Fig. 15 Fig. 16

Apply Makita grease N No.1 to the gear portion
Ball bearing 6302LLB
of Armature before press-fitting Armature onto
Gear housing. Retaining ring S-20
Spur gear 47
Clean this bearing chamber
of Gear housing complete Woodruff key 4
before mounting O ring 40 (2 pcs)
and Armature to protect
O ring 40. Crank shaft complete

O ring 40
Crank shaft complete
Gear housing complete
Pin 5
Sleeve 25
O ring 90
Pin 4

3) Assemble Helical gear 50 to Spur gear 22. Mount the assembly to Gear housing complete.
4) Put Gear housing complete onto Crank housing complete as illustrated in Fig. 18.
5) Apply an appropriate amount of ThreeBond 1215 to the figure 8 inlaid portion that contacts Gear housing cover.
Then secure Gear housing cover to Gear housing complete with four M8x75 Hex socket head bolts. (Fig. 19)

Fig. 17 Fig. 18

Assembly of Helical gear 50
and Spur gear 22
Hex socket head bolt M8x75

Fit Pin 4 on Gear housing Gear housing cover
complete in the hole of
Crank housing complete.

Before putting Gear housing
cover, apply ThreeBond 1215
to the figure 8 inlaid portion
designated with white arrow.

Crank housing comp.
P 9 / 21
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -3. Disassembling/Assembling Crank Section of AVT
DISASSEMBLING
1) Stopper and Crank box will be visible by removing Motor housing cover set and the assembly of Rear cover and
Handle (switch side).
2) Grasp the projection of Stopper with pliers. While turning Stopper, pull off from Crank box. (Fig. 19)
3) Unscrew four M12x55 hex socket head bolts with hex wrench. (Fig. 20)
Note: Use an appropriate steel pipe to extend the grip of hex wrench for easy removal of the bolts securely fastened
with adhesive.
4) Move Barrel till the connection portion of Balancer comp. and Connecting rod (for balancer reciprocating) is visible.
Now Connecting rod can be removed from Balancer complete and Crank complete as illustrated in Fig. 21.
Fig. 19 Fig. 20 Fig. 21

Barrel Crank complete Connecting rod

Hex wrench Crank box

Crank box Stopper steel pipe Balancer complete

5) Remove Crank box from Crank housing by unscrewing four M6x20 Hex socket head bolts. (Fig. 22)
6. Remove Retaining ring R-80 and Flat washer 65 from Crank box. (Fig. 23)
Fig. 22 Fig. 23
Hex socket head bolt M6x20 (4pcs)
Retaining ring R-80
Crank housing
Flat washer 65
Connecting rod Crank box
(for Piston reciprocating)

Crank box Note: Remove Retaining R-80
using Retaining Ring R Pliers
(No.R005).

7) Remove Crank by pressing with arbor press.( Fig. 24)
The other Flat washer 65 and Needle bearing 7025 still remain in Crank box in this step.
8) Needle bearing 7025 and the other Flat washer 65 can be removed from Crank box by putting the Crank complete
removed in the previous step on Flat washer 65, then pressing it with arbor press. (Fig. 25)
Fig. 24 Fig. 25

Put the removed Crank complete
Flat washer 65 on Flat washer 65.
(the other one)
Needle bearing
7025
Crank box
Flat washer 65

Crank complete Needle bearing
7025
P 10/ 21
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -3. Disassembling/Assembling Crank Section of AVT (cont.)
ASSEMBLING
1) Put Flat washer 65 into Crank box.
2) Then, as illustrated in Fig. 26, press-fit Needle bearing 7025 into Crank box using Crank complete and the other
Flat washer 65 as jigs,
Important:
Needle bearing 7025 is not reversible when assembled into Crank box. Be sure to assemble as illustrated in Fig. 26.
3) Put Ring 10 through the crank pin on Crank complete. Then apply Makita grease R.No.00 to the roller portion of
Needle bearing 7025, then assemble Crank complete into the Needle baring. (Fig. 27)
4) Put the other Flat washer 65 into Crank box. With retaining ring R-80, fix the parts assembled into Crank box.
Then make sure that Crank complete rotates easily by finger.
Fig. 26 Fig. 27
arbor press
Crank complete crank pin
Ring 10
Flat washer 65
(another one)
Assemble Needle bearing 7025
so that the brim of the needle baring
Needle bearing is placed on the arbor press side.
7025
Apply Makita grease R.No.00
Crank box Flat washer 65
to the roller portion.
(mounted in the previous step)

5) Move Crank shaft to the rear dead point (or to the front dead point). Then, aligning the elliptic hole of Crank complete
with the crank pin on Crank shaft, fit Crank box to Crank housing. (Fig. 28)
If the crank pin is not completely inserted into the elliptic hole or positioned on the wrong hole, a gap of approx. 5mm
will occur between the brim of Crank box and Crank housing. In this case, turn Crank shaft slowly until the crank pin
is completely inserted in the elliptic hole to eliminate the gap.
6) Secure Crank box to Crank housing with four M6x20 hex socket head bolts. (Fig. 29)
7) Do the reverse of the disassembling steps from 1) to 4).
Fig. 28 Fig. 29

Crank shaft
Connecting rod at the rear dead point
crank pin
on Crank shaft

Crank housing elliptic hole

Crank box

Hex socket
head bolt M6x20
Crank complete Crank box
P 11/ 21
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -4. Disassembling/Assembling Barrel Section
DISASSEMBLING
1) Remove Stopper, Connecting rod (for balancer reciprocating) and Crank box. (See 1) to 5) of [3] -3.)
2) From Crank housing, separate Barrel then the assembly of Cylinder liner 62 and Balancer complete. (Fig. 30A)
Note: When replacing Barrel with new one, replace Plate (the guide for Balancer complete) at the same time.
When reusing two M5x16 Hex socket bolts, apply appropriate amount of adhesive to them. (Fig. 30B)
3) Take out Striker from Cylinder liner 62, then remove O ring 52 from Striker. (Fig. 30C)
4) Take out Piston and Connecting rod (for Piston reciprocating) from Crank housing complete, and remove O ring 52
and O ring 55 from the removed Piston. (Fig. 30D)
Fig. 30A Fig. 30B

Balancer complete Piston Barrel Hex socket head
bolt M5x16

Cylinder liner 62 Spacer
Barrel Flat washer 63
Crank housing comp. Plate
Fig. 30C Fig. 30D

Piston and Connecting Rod

Striker O ring 52 O ring 52 O ring 55

ASSEMBLING
Do the reverse of the disassembling steps.
Note:
Striker and Spacer are not reversible when assembled to Cylinder liner 62. Be sure to install as illustrated in Fig. 31.
Fig. 31

Spacer
Striker Cylinder liner 62
[Cross section]
[Crank housing side]
[Tool retainer side]

CORRECT

WRONG

Do not forget to put Flat washer 63 between Cylinder Fig. 32
liner 62 and Crank housing complete.
When assembling Barrel to Crank housing complete, Barrel Gasket Crank housing complete
first fit Pin 5 in the hole on Barrel, and put the pin
through the hole of Gasket.
Then fit Barrel to Crank housing complete so that
Pin 5 is inserted into the hole on Crank housing
complete. (Fig. 32)

Pin 5
P 12/ 21
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -5. Disassembling/Assembling Tool Retainer Section
DISASSEMBLING
1) Tool retainer can be removed as illustrated in Fig. 33.
Fig. 33

Tool holder 29 Tool retainer Slotted
screwdriver

Spring pin 8-40 Tool retainer shaft

Swivel Tool retainer to the Remove spring pin 8-40 Tap out Tool retainer shaft
position illustrated above. with Spring pin extractor using slotted screwdriver.
(No.1R348). Now Tool retainer can be
removed from Tool holder.

2) For removing Tool retainer poles, first set Gear extractor, large (No.1R045) as illustrated in Fig. 34.
*Attach Center attachment (No.1R346) to No.1R045.
*Adjust the pitch of the arms of No.1R045 to minimum for securely holding Retainer ring.
*Set Tool retainer pole removing tool (No.1R347) between No.1R346 and Tool retainer pole.
3) Then pull Retainer ring in the direction of Tool retainer pole by turning the handle of 1R045 clockwise, and remove
Pin 4 from the rod hole of Tool retainer pole by hand. (Fig. 34)
Be sure to securely hold the arms of No.1R045 not to spread out, or the arms will fall off from retainer ring and
Compression spring and Retainer ring will fly away.
4) Slowly loosen the handle of No.1R045 by turning counterclockwise until Retainer ring is released from Compression
spring 12. Now Tool retainer pole can be removed from Tool holder 29. (Fig. 35)
Fig. 34 Fig. 35

Retainer ring Tool retainer pole No.1R347
Tool retainer pole
No.1R346
Tool holder 29

No.1R045 Compression
Pin 4 Compression spring 12
Adjust the pitch between spring 12
Retainer ring
the arms to minimum.
P 13/ 21
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -5. Disassembling/Assembling Tool Retainer Section (cont.)
ASSEMBLING
Do the reverse of the disassembling steps.
Note:
When assembling Tool retainer to Tool holder 29, follow the instructions described below. (Fig. 36 - 39)
Fig. 36

Tool holder 29 Slotted screwdriver

Tool retainer

Pin 4 insertion hole

A Insert tool retainer shaft by tapping with plastic hammer
B till the Pin 4 insertion hole of Tool retainer shaft is aligned
C with that of Tool retainer.
Tool retainer shaft

A) See Fig. 37. As illustrated to left, when assembled to Tool holder 29, Tool retainer pole is pulled in the direction of
Barrel by the force of Compression spring 12, and the hole of Tool retainer pole is not aligned with the hole of Tool
holder 29.
Therefore, as illustrated to right, while aligning the two holes by sliding Tool retainer pole with slotted screwdriver,
assemble Tool retainer and Tool retainer shaft to Tool holder 29.
Fig. 37

Tool holder 29 Tool retainer pole Slotted screwdriver

Barrel

Compression spring 12

B) Insert Tool retainer shaft from the end chamfered more than the other. (Fig. 38)
C) Tool retainer shaft is not reversible when inserted into Tool retainer. As illustrated in Fig. 39, be sure to insert so that
the concave portion on Tool retainer shaft is positioned on the bit insertion hole of Tool holder 29.

Fig. 38 Fig. 39

Tool retainer Tool holder 29 Bit insertion hole
End chamfered more

Tool retainer shaft Concave portion
Tool retainer shaft
P 14/ 21
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -6. Disassembling/Assembling Tool Holder Section
DISASSEMBLING
1) Remove Tool retainer section from Tool holder 29. (Figs. 33, 34, 35)
2) Separate Tool holder 29 from Barrel by unscrewing four M12x45 Hex socket head bolts as illustrated in Fig. 40.
Note: Use an appropriate steel pipe to extend the grip of hex wrench for easy removal of the bolts securely fastened
with adhesive.
3) Remove Impact bolt by tapping the edge of Tool holder 29. (Fig. 41)
4) Take out X ring 40 from Tool holder 29 using small screwdriver or the like. (Fig. 42)
Now Tool holder 29 can be replaced. If Cylinder B is contaminated with dust, X ring 40 can be damged.
In this case, also replace X ring 40, and clean up the inside of Barrel section.
5) Take out Cylinder B from Barrel by tapping its edge with plastic hammer. (Fig. 43)
6) Take out Impact bolt holder from Cylinder B by tapping its edge with plastic hammer. Then remove O ring 53
from Cylinder B. (Fig. 44)
7) Remove O ring 60 and Rubber ring 54 from Impact bolt holder. (Fig. 45)
Fig. 40 Fig. 41 Fig. 42

Hex socket head bolt Barrel
M12x45 (4pcs) Steel pipe
Tool bolder 29 Cylinder B
Hex wrench
X Ring 40
Impact bolt

Barrel

Tool bolder 29
Tool bolder 29

Fig. 43 Fig. 44 Fig. 45
Barrel
O ring 60
Impact bolt holder
Impact bolt holder
Cylinder B

O ring 53 Rubber ring 54
Cylinder B Impact bolt holder

ASSEMBLING
Do the reverse of the disassemblidng steps.
Note: Do not forget to apply adhesive to M12x45 Hex socket head bolts.
P 15/ 21

Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -7. Assembling Handle
See Fig. 46.
Fig. 46
When mounting Handle and Side handle, be sure to:
a) Place Handle (on which Switch and Switch lever
Switch lever
are installed) on the side where oil gauge cap is
installed.
b) Place Side handle on the opposite side.

Side handle Handle

Oil gauge cap

[4] Maintenance
When replacing carbon brush, it is recommended to do the following maintenance at the same time for longer service life
of the machine:
1) Replace the following parts (Fig. 47);
56. O ring 52 mounted to Piston
58. O ring 52 mounted to Striker
84. O ring 53 mounted to Cylinder B
98. X ring 40 mounted to Tool holder 29
100. O ring 60 mounted to Impact bolt holder
Fig. 47

56 58 84 100 98

Piston Striker Cylinder B Impact bolt holder Tool holder 29

2) Additionally apply approx. 60g of Makita grease R No.00 to the inside of Crank housing complete.
P 16/ 21
Circuit diagram
Motor housing B
Side A
Color index of lead wires' sheath
Black
White
Red
Orange Side B
Purple
Field

Countries That Require Noise Suppression Circuitry

Terminal block Lead unit Connector Pilot lamp

Insulated
connector Insulated Brush holder Brush holder Insulated
connector on side B on side A connector

Switch

Field

Power supply cord

Noise suppressor Line filter

USA, Canada, Panama, Mexico, Cyprus, Korea

Terminal block Lead unit Connector Pilot lamp

Insulated Insulated Brush holder Brush holder Insulated
connector connector on side B on side A connector

Switch

Field

Power supply cord
P 17/ 21
Circuit diagram
Motor housing B
Side A
Color index of lead wires' sheath
Black
White
Red
Orange Side B
Purple
Field

Other Countries

Lead unit Connector Pilot lamp

Insulated Insulated Brush holder Brush holder Insulated
connector connector on side B on side A connector

Switch

Field

Insulated
connector
Power supply cord
P 18/ 21
Wiring diagram
We are explaining the wiring in three sections. (Fig. 48)
Fig. 48

Motor housing B

Top cover
[3] Cap cover

Handle side
Motor side

Lead wires

[1] Crank housing cap Rear case [2] Handle sub base

[1] Wiring in Crank Housing Cap
Note: Illustrated below in Fig. 49 is Crank housing cap viewed from Cap cover side.
Fig. 49

Fix the following lead wires with Route the following six lead wires
Lead wire holders A, B and C; through this opening of Motor housing B:
A Two orange lead wires Motor housing B *Four Field lead wires
(Field lead wire, Lead wire from Brush holder) (orange, black, black, purple)
B Two purple lead wires *Two lead wires from Brush holder
(Field lead wire, Lead wire from Brush holder) (orange, purple)
Two Field lead wires (black)
C Two Field lead wires (black)

When fixing Lead wires with
Lead wire holders A and B, If Noise suppressor is used,
be sure that all the wires are tight be careful not to move Noise
between the Lead wire holders and suppressor out of place when
the opening of Motor housing B. connecting its lead wires with
the insulated connector in
Cap cover.

Lead wire holder B
Cap cover side
Noise suppressor
If noise suppressor is used, put here
in place after wrapping with Sponge.
Lead wire holder A
Purple lead wires
Orange lead wires (Field lead wire, Lead wire
(Field lead wire, Lead wire from Brush holder)
from Brush holder)
Insulated connector
Insulated connector
Pilot lamp
Line filter Fix Pilot lamp with this holder.
(See the illustration below.)
Sponge sheet
Lead wire holder C If Line filter is used,
Field lead wire (black) put Sponge sheet under it.

Line filter
Field lead wire (black)
Wind Field lead wires (black) around
Line filter as illustrated to right,
then cover the Line filter with Sponge. Line filter
Sponge
P 19/ 21
Wiring diagram
[2] Wiring in Handle Sub Base
When Using Terminal Block
1) Before installing Switch, connect the lead wires with Terminal blocks as illustrated in Fig. 52.
Fig. 52

to Switch Lead wires of Lead unit
opening of the pipe Before routing, be sure to put through the pipe of
Handle sub base from Motor side as illustrated below.

rib A

Motor side Handle side
boss
boss
Terminal Route round the pin, then route between the boss and
Terminal block the inside wall of Handle sub base.
block
Route round the pin and the rib B, then route between
rib C the boss and the inside wall of Handle sub base.
rib B Important: Be careful not to route over the rib A.
pin
Relay wires (white)
Route each wire between the boss and the inside wall
Connector of of Handle sub base.
Lead unit Lead wires of Power supply cord
[Handle sub base viewed Route each wire between the inside wall of Handle
from Handle side] sub base and the rib B/ rib C.

2) After installing Switch, connect the lead wires with Switch as illustrated in Fig. 53.
Fig. 53

Relay wires (red)
Pin Before routing, be sure to
Pin
put through the pipe of
Handle sub base from
Switch
Motor side as illustrated
to right.
rib B
Relay wires (white)
Noise Route each wire between the pin and the inside wall
suppressor of Handle sub base.
(if used)
Lead wires of Noise suppressor
rib D Be careful not to route over the ribs B and D.

Terminal block surface A
How to Put Noise Suppressor in Place Noise suppressor
If Noise suppressor is used, wrap it with sponge, Sponge
and put in the space between the rib A and the rib B Bottom of
so that the surface A of Noise suppressor is parallel Handle Sub Base
to the bottom of Handle sub base as illustrated to right.

3) After finishing the wiring in Sub handle base, route the Fig. 54
following lead wires through the opening of Top cover
and Rear cover as illustrated in Fig. 54:
Lead wires of Lead unit Handle sub cover
Relay wires (red)
Rear cover
Top cover
P 20/ 21
Wiring diagram
[2] Wiring in Handle Sub Base
When Not Using Terminal Block
1) Before installing Switch, connect the lead wires with Insulated connectors as illustrated in Fig. 55.
Fig. 55

to Switch
Lead wires of Lead unit
opening of the pipe Before routing, be sure to put through the pipe of
Handle sub base from Motor side as illustrated below.

boss

boss Motor side Handle side
Insulated
Insulated connector
connector Route each wire between the inside wall of Handle
sub base and the rib B/ rib C.
rib C
rib B Relay wires (white)
Route each wire between the boss and the inside wall
of Handle sub base.

Connector of Lead wires of Power supply cord
Lead unit Route each wire between the inside wall of Handle
[Handle sub base viewed sub base and the rib B/ rib C.
from Handle side]

2) After installing Switch, connect the lead wires with Switch as illustrated in Fig. 56.
Fig. 56

Insulated connector
surface A
How to Put Noise Suppressor in Place Noise suppressor
If Noise suppressor is used, wrap it with sponge, Sponge
and put in the space between the rib A and the rib B Bottom of
so that the surface A of Noise suppressor is parallel Handle Sub Base
to the bottom of Handle sub base as illustrated to right.

3) After finishing the wiring in Sub handle base, route the Fig. 57
following lead wires through the opening of Top cover
and Rear cover as illustrated in Fig. 57:
Lead wires of Lead unit Handle sub cover
Relay wires (red)
Rear cover
Top cover
P 21/ 21
Wiring diagram
[2] Wiring in Cap Cover
1) First, if Noise suppressor is used, in order to protect lead wires, stick Sponge sheet to the surface A of Cap
cover so that the longer side of Sponge sheet contacts the surface B of Cap cover and the shorter side
contacts the surface C. (Fig. 58)
Fig. 58

Surface A
Sponge sheet
Cap cover
shorter side Surface C
Sponge sheet Surface B
longer side

2) Then connect the lead wires as illustrated in Fig. 59.
Fig. 59

Connector

Noise suppressor

Handle sub base

Crank housing cap Cap cover Rear case

Field lead wires (black)
Top cover
Lead w

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