ECHNICAL INFORMATION
PRODUCT
P 1/17
T
Models No.
Description
HK1820
Power Scraper
L
CONCEPT AND MAIN APPLICATIONS
H
Model HK1820 has been developed as the successor model of HK1810,
featuring vibration absorbing handle additionally to the same compact
and lightweight design as the predecessor model.
Also features the chuck adapted for SDS-PLUS bits.
W
Dimensions: mm (")
Length (L) 351 (13-3/4)
Width (W)
Height (H)
102 (4)
203 (8)
Specification
Continuous Rating (W)
Voltage (V)
Cycle (Hz)
Max. Output (W)
Current (A)
Input
550
---
Output
260
260
110
120
220
230
240
5.3
5.0
2.6
2.5
2.4
50/60
50/60
50/60
50/60
50/60
390
390
390
390
390
550
550
550
260
260
260
Impacts per min: ipm=min-1
Shank type: mm (")
0 - 3,200
SDS-Plus
Impact energy [catalog value]: J
3.9
Yes
Yes
by trigger
by dial
Variable speed control
Protection from electric shock
Power supply cord: m (ft)
Net weight: kg (lbs)
Double insulation
Chile, Brazil: 2m (6.6ft)
Other countries: 5m (16.4ft)
3.3 (7.3)
Standard equipment
Bull point ................................. 1
Scaling chisel ........................... 1
Scaling chisel (for tile) ............. 1
Hook complete ......................... 1
Plastic carrying case ................. 1
Note: The standard equipment for the tool shown above may differ by country.
Optional accessories
Bull points
Hook complete
Cold chisel
Scraper assembly
Grooving chisels
Scaling chisel
Scaling chisel (for tile)
Grease vessel (containing Hammer grease)
Bit grease
Safety goggles
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P 2/17
Repair
CAUTION: Remove the bits from the machine for safety before repair/maintenance
in accordance with the instruction manual!
[1] NECESSARY REPAIRING TOOLS
Code No.
Description
Use for
1R003 Retaining ring pliers ST-2N Removing/mounting Ring spring
1R022 Bearing plate
1R023 Pipe ring
Stabilizing Bearing box when removing Ball bearing 6002LLU
Stabilizing Crank housing complete when removing Armature
1R029 Bearing setting pipe 23-15.2 Removing Oil seal 15 and Ball bearing 6002LLU from Bearing box
1R212 Tip for retaining ring pliers
1R225 Bearing extractor
1R228 1/4" Hex shank bit for M4
1R229 1/4" Hex shank bit for M5
1R258 V Block
Removing/mounting Ring spring (for modular use with 1R003)
Removing Armature and Ball bearing 6001DDW from Crank housing comp.
Removing M4x25 Hex socket head bolt from Crank housing cover
Removing M5x25 Hex socket head bolt from Barrel
Stabilizing Bearing box when removing Helical gear 36
1R288 Screwdriver magnetizer
Magnetizing Screwdriver when removing Steel balls and Pins
[2] LUBRICATION
Apply the following lubricants to protect parts and product from unusual abrasion:
*Makita grease N.No.1 to the portions designated with black triangle
*Makita grease R.No.00 to the portions designated with gray triangle
*Makita grease N.No.2 to the portions designated with white triangle
Item No.
Description
Steel ball 4.8 (3 pcs)
Steel Ball 7.0 (2 pcs)
O Ring 12
Portion to lubricate
Whole portion
Lubricant
Amount
a little
7
Makita grease
N.No.2
23
27
30
32
37
38
39
61
Whole portion
Whole portion
a little
3g
Cylinder
Inside surface that Piston and Striker contacts
Inside periphery that contacts 30 Cylinder
Whole portion
Ring 29
Makita grease
R.No.00
O Ring 18 on Striker
O Ring 18 on Piston
Pin 7
a little
Whole portion
Cylindrical surface that contacts Connecting rod
17g
Crank housing complete Crank room
Whole portion for smooth rotation
of Helical gear 36
58 59 Flat washer 22
a little
Makita grease
N.No.1
Gear portion for smooth rotation
of Helical gear 36
68
Armature
4g
Fig. 1
Bearing box
Crank shaft
58
59
Helical gear 36
61
32
38
27
37
30
23 7
39
Tool holder
Ring 25
23
Striker
Impact bolt
Piston
Compression spring 32
Connecting rod
68
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P 3/17
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Chuck Section
DISASSEMBLY
Disassemble the Chuck section as described in Figs. 2 and 3.
Fig. 2
1) For easy repairing, separate Handle section and stand the machine on a workbench as illustrated below on right.
Note: Remove Compression spring 14 before standing the machine if it is left on Crank housing complete.
Crank housing complete
Handle section
M5x20 Pan head screw (2 pcs)
Motor housing
5x25 Tapping screw (2 pcs)
Disconnect Connector housing
of Controller from Motor housing.
Fig. 3
2) Remove Cap 38 with
slotted screwdriver.
3) Remove Ring spring 19 with 1R212 and
1R003 while pressing down Chuck cover.
4) Remove Chuck cover and
Compression spring 42.
Compression spring 42
1R212 and 1R003
Ring spring 19
Cap 38
Chuck cover
Chuck cover
Note:
Be sure to press down
Chuck cover or it will
pop off due to the pressure
of Compression spring 42.
5) Remove Steel ball 7 (2 pcs)
using screwdriver magnetized
with 1R288 while pressing
down Ring 21.
6) The parts inside Change ring can
be removed.
7) Change ring can
now be removed.
Change ring
Ring 21
Screwdriver magnetized
with 1R288
Guide washer
Steel ball 7 (2 pcs)
Conical compression
spring 21-29
Steel ball guide
Ring 21
DISASSEMBLY
Do the reverse of the disassembling steps.
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P 4/17
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Barrel, Tool Holder, Cylinder Section
DISASSEMBLY
1) Disassemble the Chuck section as described in Figs. 2, 3.
2) Disassemble Tool holder, Ring 25 and Cylinder section from Barrel as described in Figs. 4, 5, 6.
Fig. 4
Remove Crank housing cover.
Remove Ring spring 43
with slotted screwdriver.
Remove Barrel cover support
and Barrel cover.
M4x25 Hex socket
head bolt (1 pc)
Ring spring 43
Barrel cover
support
Crank housing cover
Barrel cover
Fig. 5
Remove Steel ball 4.8 (3 pcs) from each hole
of Ring 25 with slotted screwdriver.
Barrel section can now be separated from
Crank housing complete by unscrewing
four M5x25 Hex socket head bolts with 1R229.
Screwdriver magnetized
with 1R288
Tool holder
Ring 25
Ring 25
Barrel section
Barrel
Steel ball 4.8 (3 pcs)
Turn counterclockwise.
1R229
M5x25 Hex socket
head bolt (4 pcs)
Fig. 6
Strike Tool holder against work bench.
Tool holder, Ring 25 and Cylinder section can now be removed
from Barrel. Remove O ring 48 from Barrel.
Cylinder section
O Ring 48
Tool holder
Barrel
Ring 25
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P 5/17
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Barrel, Tool Holder, Cylinder Section
DISASSEMBLY
3) Separate Tool holder from Cylinder section as described in Fig. 7.
4) Disassemble Impact bolt and Cylinder section as described in Fig. 8.
Fig. 7
1. Pull out Striker from
Cylinder section.
2. Remove ring 25, Urethane ring 26
and Ring spring 37 from Cylinder.
3. By removing Ring 39, you can see
Pin 6 (3 pcs) that join Tool holder
with Cylinder.
Ring 25
Ring 39
Ring spring 37
Pin 6 (3 pcs)
Cylinder section
Striker
Urethane ring 26
4. By removing Pin 6, Tool holder can be separated from Cylinder section.
Remove Rod 2.5 (3 pcs) from the grooves of Cylinder.
5. Push out Impact bolt section from
Cylinder section using screwdriver.
Screwdriver,
Tool holder
magnetized with 1R288
Rod 2.5 (3 pcs)
Pin 6 (3 pcs)
Impact bolt section
Cylinder section
Note: Pin 6 can be removed as described below if it is difficult to remove.
1. Apply magnetized
screwdriver to Pin 6.
2. Align the through hole
of Tool holder with that
of Cylinder by pushing
Tool holder.
3. Remove Pin 6 using
magnetized screwdriver
when the two holes are
aligned.
Screwdriver,
magnetized with 1R288
Pin 6
Tool holder
Cylinder
Fig. 8
Disassembling Impact Bolt Section
Disassembling Cylinder Section
After removing O Ring 26, the following parts
can be removed from Cylinder:
Rubber ring 13
Cup washer 29, Compression Spring 32, Ring 29
Cup washer 29
Ring 29
Impact bolt
Flat washer 12
Cylinder
O Ring 26
Compression Spring 32
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P 6/17
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Barrel, Tool Holder, Cylinder Section
ASSEMBLY
Do the reverse of the disassembling steps.
Note: Rubber ring 13 is directional when assembled to Impact bolt.
Be sure to assemble as illustrated to left in Fig. 9.
Fig. 9
Correct
Wrong
Impact bolt
Rubber ring 13
Flat washer 12
Impact bolt Rubber ring 13 Flat washer 12
Metal portion
Rubber portion
Rubber portion
Metal portion
[3] -3. Electrical Parts in Handle Section
DISASSEMBLY
1) Disassemble Handle section as described in Fig. 2
2) The electrical Parts can be replaced as described in Fig. 10.
Fig. 10
1. Disassemble Handle cover from Handle
by unscrewing 4x18 tapping screw.
2. Disconnect all the Lead wires from Switch.
Controller, Switch and Power supply cord can now be replaced.
Handle base
Handle
Controller
Handle cover
Switch
Strain relief
4x18 Tapping
screw (1 pc)
Power supply cord
4x18 Tapping screw (1 pc)
ASSEMBLY
Do the reverse of the disassembling steps.
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P 7/17
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -4. Motor Section
DISASSEMBLY
1) Disassemble Handle section as illustrated in Fig. 2
2) Separate the contact of Carbon brushes from Commutator as described in Fig. 11.
3) Disassemble Crank housing complete from Motor housing as illustrated in Fig. 12.
4) Remove Piston from Crank shaft as illustrated in Fig. 13.
Fig. 11
1. Remove Rear cover from Motor housing.
2. Remove the end of Spiral spring
[Spiral spring and Carbon brush
viewed from A]
from Carbon brush because
Carbon brush is pressed with
Spiral spring to maintain secure
Carbon brush Spiral spring
Motor housing
contact with Commutator.
A
3. By pulling Carbon brush,
separate the contact of
Carbon brushes from
Commutator.
Rear cover
4x18 Tapping screw
(2 pcs)
Fig. 12
1. Disconnect Crank housing cover
from Crank housing complete
by unscrewing M4x25 Hex socket
head bolt; no need to remove the
cover in this step.
2. Lifting up Crank housing cover,
remove Barrel section from
Crank housing by unscrewing
four M5x25 Hex socket head
bolts.
3. Disassemble Crank housing
complete from Motor housing
by unscrewing four 5x25
Tapping screws.
Crank housing complete
M5x25 Hex socket
head bolt (4 pcs)
M4x25 Hex socket
head bolt (1 pc)
5x25 Tapping
Screw (4 pcs)
Crank housing cover
Motor housing
Fig. 13
1. Remove Crank cap by unscrewing
four M4x18 Pan head screws.
2. For easy removal of Piston,
move it to the front dead center.
3. Remove Piston, then unscrew
two M4x16 Hex socket head
bolts that fasten Crank section
to Crank housing complete.
M4x18 Pan head
screw (4 pcs)
Piston
M4x16 Hex socket
head bolt (2 pcs)
Piston
Crank cap
Crank housing
complete
Crank chamber,
viewed from Crank cap side
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P 8/17
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -4. Motor Section
DISASSEMBLY
5) Remove Crank section from Crank housing complete by tapping Fig. 14
Crank housing complete with plastic hammer. (Fig. 14)
6) Remove Armature from crank housing complete using 1R023,
1R225 and arbor press as described in Fig. 15.
Crank section
O Ring 39
Crank housing complete
Fig. 15
1. Set Crank housing complete
on 1R023, and apply the thin
end of 1R225 to Armature shaft.
Then press down 1R225 using
arbor press until it stops.
2. Turn over 1R225, and fit the pin on the thick end of 1R225
in the inner race of Ball bearing 6001DDW.
Armature can now be removed by pressing down 1R225
using arbor press.
Note:
1R225 of old specification cannot
be set in place due to the height A
of 20mm. If your 1R225 is old one,
grind down the height A to 15mm
or less using power grinder.
thin end
of 1R225
thick end
of 1R225
pin
1R225
Crank housing
complete
height A
1R023
[Cross-sectional view]
[Cross-sectional view]
thick end
of 1R225
thin end
of 1R225
Armature shaft
Ball bearing
6001DDW
ASSEMBLY
Do the reverse of the disassembling steps.
Note: Make sure that O Ring 39 is mounted to Bearing box of Crank section before assembling Crank section
to Crank housing complete. (Fig. 14)
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P 9/17
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -5. Gear (Crank) Section
DISASSEMBLY
1) Disassemble Gear (Crank) section from Crank housing complete as described in Figs. 11 - 14.
2) Gear (Crank) section can now be disassembled as described in Fig. 16.
Fig. 16
3. Put 1R022 under Bearing box to make
Bearing box parallel to arbor press,
then apply 1R029 to Oil seal 15.
By pressing down 1R029 with arbor press,
Oil seal 15 and Ball bearing 6002LLB
can be removed from Bearing box.
1. Stabilizing Bearing box
of Gear section on 1R258,
remove Crank shaft using
arbor press.
2. Remove Helical gear 36
and Flat washer 22 (2 pcs)
from Bearing box.
Helical gear 36
Bearing box
1R258
1R029
1R022
Flat washer 22
(2 pcs)
Oil seal 15
Crank shaft
Ball bearing 6002LLU
ASSEMBLY
Do the reverse of the disassembling steps.
Note: Make sure that O Ring 39 is mounted to Bearing box of Crank section before assembling Crank section
to Crank housing complete. (Fig. 14)
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P 10/17
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -6. Handle Section
DISASSEMBLY
Handle section consists of the following main parts: Handle base, Handle, Handle cover
And it can be disassembled as illustrated in Figs. 17 - 20.
Fig. 17
Fig. 18
2. Remove Handle cover and
1. Separate Handle section from the machine first by removing the four
screws illustrated below, then by disconnecting Connector housing of
Controller from Motor housing; Compression spring 14 can be
removed from Crank housing in this step.
Spring guide from Handle base.
4x18 Tapping screw (2 pcs)
Compression spring 14
Handle section
Spring guide
Handle base
Handle
M5x20 Pan head
screw (2 pcs)
Handle cover
Connector housing
of Controller
5x25 Tapping
screw (2 pcs)
4x18 Tapping screw (1 pc)
Fig. 19
Fig. 20
3. Separate Handle from Handle base.
Note: See Fig. 10 for disassembling the electrical parts
in Handle section.
4. Remove Switch lever and Stop ring E-4
from Handle. Compression spring 8 and
Lock-on button can now be removed.
Handle base
Dust cover support
Lock-on button
Dust cover
Compression spring 8
Handle
Stop ring E-4
Switch Lever
Shoulder sleeve 6 (2 pcs)
5x25 Tapping screw (2 pcs)
ASSEMBLY
Do the reverse of the disassembling steps.
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P 11/17
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -7. Recommended Fastening Torque of Screws and Bolts
Tighten the bolt to the recommended torque described in Fig. 21.
Fig. 21
Q'ty
4
Fastening Torque
Item No.
19
Description
M5 x 25 Hex socket head bolt
19
7.8 - 11.8 N.m
Barrel
Crank housing
complete
[4] MAINTENANCE PROGRAM
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 parts described in Fig. 22 with new ones.
2) Wash out or wipe off old grease in Crank housing complete, and lubricate the parts
in accordance with the instructions in [2] LUBRICATION. (Refer to Fig. 1.)
Fig. 22
Item No.
Description
1
9
Cap 38
1
Urethane Ring 26
Steel ball 7.0 (2 pcs)
O Ring 12
23
27
28
Rubber Ring 13
O Ring 18 (thick one)
Chuck cover Guide washer Change ring
37 38
Steel ball 4.8
Connecting rod
Piston
Ring 21 Tool holder
Impact bolt
Striker
Cylinder Ring 29
9
23
27
28
37
38
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P 12/17
Circuit diagram
Color index of lead wires' sheath
Black
White
Blue
Red
Clear
Orange
Brown
Fig. D-1A
High Voltage Areas where Radio Interference Suppression Is Required
Polyolefin tube (Protective tube)
Connector
Connector housing B
Connector housing A
Noise
suppressor
Switch
Choke coil
Power supply cord
Fig. D-1B
Low Voltage Areas where Radio Interference Suppression Is Required
Polyolefin tube (Protective tube)
Connector
Grounding (Earth) terminal
Connector housing A
Noise
Switch
suppressor
Power supply cord
Fig. D-1C
Other Areas where Radio Interference Suppression Is Not Required
Polyolefin tube (Protective tube)
Connector
Connector housing A
Switch
Power supply cord
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P 13/17
Wiring diagram
[1] Routing Wires Through Handle Base and Handle
Be careful not to pinch the Lead wires with the ribs. (Figs. D-2, D-3)
Fig. D-2
Do not to put the Lead wire (clear)
of Noise suppressor on these ribs.
Handle base
Handle base,
viewed from
Controller side
Handle
Through hole for
Handle cover
passing Lead wires
from Controller and
Connector housing
to the opposite side
Controller
Through hole for
passing Grounding
(Earth) wire from
the opposite side
Noise suppressor
(if used)
Do not put the Lead wires on this rib
or they will be pinched between the rib
and Handle.
Do not to put the Lead wires on these ribs
or they will be pinched between the ribs
and Motor housing.
Fig. D-3
Handle,
viewed from Handle cover side
Through hole for
passing Lead wires
to the opposite side
Do not to put the Lead wires on this rib
or they will be pinched between the rib
and Handle cover.
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P 14/17
Wiring diagram
[2] Wiring in Handle Base and Handle
High Voltage Areas where Radio Interference Suppression Is Required
Fig. D-4A
Handle base,
viewed from Controller side
Lead wires covered with
Polyolefin tube (black)
red
Controller
blue
Route all of the Controller's
Lead wires through this slit.
Pass these Lead wires from Controller
and Connector housing A through
the hole illustrated to right in Fig. D-2.
Fix the following Lead wires of
Controller with this Lead wire holder:
*Lead wire (orange) to Choke coil
*Lead wires (black, red) to Connector
housing A
Connector housing A
Connector housing B
Choke coil
Controller
The Lead wires to Connector
housings must be tight between
Controller and Lead wire holder.
Fig. D-5A
Handle, viewed from Handle cover side
Fix all of the Lead wires to Switch
with this Lead wire holder of
Switch holder complete.
Switch holder
Switch
Route all of the Lead wires
to Switch through between
the boss and the rib.
Pass Controller’s Lead wires covered
with Polyolefin tube (black) between
Switch and Switch holder's wall.
rib
boss
Pass the following Lead wires
through this hole:
*Noise suppressor's Lead
wires (black)
*Controller’s Lead wires covered
with Polyolefin tube (black)
*Lead wire (red) from
Handle base,
viewed from Handle side
Connector housing A
*Controller's Lead wire (white)
Put the slack portion of
Lead wires in this space.
Noise suppressor
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P 15/17
Wiring diagram
[2] Wiring in Handle Base and Handle
Low Voltage Areas where Radio Interference Suppression Is Required
Fig. D-4B
Handle base,
viewed from Controller side
Put the slack portion of
Grounding wire in this space.
Fix Grounding wire (clear)
with this Lead wire holder.
Grounding wire (clear)
Terminal of Grounding wire
Fix Grounding wire (clear)
with this Lead wire holder.
Lead wires covered with
Polyolefin tube (black)
red
Controller
white
Route all of the Controller's
Lead wires and grounding
wire (clear) through this slit.
Pass these Lead wires from Controller
and Connector housing A through
the hole illustrated to right in Fig. D-2.
Fix the following Lead wires of
Controller with this Lead wire holder:
*Grounding wire (clear)
*Lead wires (black, red) to Connector
housing A
Connector housing A
Controller
The Lead wires to Connector
housing A must be tight between
Controller and Lead wire holder.
Fig. D-5B
Handle, viewed from Handle cover side
Fix all of the Lead wires to Switch
with this Lead wire holder of
Switch holder complete.
Switch holder
Switch
Route all of the Lead wires
to Switch through between
the boss and the rib.
Pass Controller’s Lead wires covered
with Polyolefin tube (black) between
Switch and Switch holder's wall.
rib
boss
Pass the following Lead wires
through this hole:
*Noise suppressor's Lead
wires (black)
Handle Base,
viewed from Handle side
*Controller’s Lead wires covered
with Polyolefin tube (black)
*Lead wire (red) from
Connector housing A
*Controller's Lead wire (white)
Pass Grounding wire (clear)
through the hole illustrated
to right in Fig. D-2.
Grounding wire (clear)
Put the slack portion of
Lead wires in this space.
Noise suppressor
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P 16/17
Wiring diagram
[2] Wiring in Handle Base and Handle
Other Areas where Radio Interference Suppression Is Not Required
Fig. D-4C
Handle base,
viewed from Controller side
Lead wires covered with
Polyolefin tube (black)
red
Controller
blue
Route all of the Controller's
Lead wires through this slit.
Pass these Lead wires from Controller
and Connector housing A through
the hole illustrated to right in Fig. D-2.
Fix the following Lead wires of
Controller with this Lead wire holder:
*Lead wires (black, red) to Connector
housing A
Connector housing A
Controller
The Lead wires to Connector
housing A must be tight between
Controller and Lead wire holder.
Fig. D-5C
Handle, viewed from Handle cover side
Fix all of the Lead wires to Switch
with this Lead wire holder of
Switch holder complete.
Switch holder
Switch
Route all of the Lead wires
to Switch through between
the boss and the rib.
Pass Controller’s Lead wires covered
with Polyolefin tube (black) between
Switch and Switch holder's wall.
rib
boss
Pass the following Lead wires
through this hole:
*Controller’s Lead wires covered
with Polyolefin tube (black)
*Lead wire (red) from
Handle base,
viewed from Handle side
Connector housing A
*Controller's Lead wire (blue)
Put the slack portion of
Lead wires in this space.
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P 17/17
Wiring diagram
[3] Connecting Connector Housing with Brush Holder Unit
Connector housing is directional when connected with Brush holder complete in Motor housing.
Be sure to connect as described in Fig. D-6.
Fig. D-6
The side where Lead wires are drawn out must be placed on Rear cover side as illustrated blow.
Connector housing B
(if used)
Connector housing A
Motor housing
side where Lead wires
are drawn out
Choke coil
(if used)
to Controller
on Handle base
Rear cover
[DO NOTs]
1. The side where Lead wires are drawn out
must not be placed on the opposite side to
Rear cover.
2. Do not put Lead wires on Connector
housing(s) or Lead wires will be
pinched between Handle base and
Motor housing.
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