Makita HK1820 User Manual

ECHNICAL INFORMATION

Models No.

HK1820

PRODUCT

P 1/17

Description

Power Scraper

CONCEPT AND MAIN APPLICATIONS

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.

Specification

Voltage (V) Cycle (Hz)

110 120

220 230 240

Current (A)

5.3

5.0

2.6

2.5

2.4

50/60 50/60

50/60 50/60 50/60

Continuous Rating (W)

Input Output

550

---

550 550 550

260 260

260 260 260

Dimensions: mm (")

Length (L)

Width (W)

Height (H)

Max. Output (W)

351 (13-3/4)

390 390

390 390 390

102 (4)

203 (8)

Impacts per min: ipm=min-1 Shank type: mm (")

Impact energy [catalog value]: J 3.9

Variable speed control

Protection from electric shock

Power supply cord: m (ft)

Net weight: kg (lbs)

Chile, Brazil: 2m (6.6ft)

Other countries: 5m (16.4ft)

0 - 3,200

SDS-Plus

Yesby trigger Yesby dial

Double insulation

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 Cold chisel Grooving chisels Scaling chisel Scaling chisel (for tile)

Hook complete Scraper assembly Grease vessel (containing Hammer grease) Bit grease Safety goggles

P 2/17

[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

[1] NECESSARY REPAIRING TOOLS

CAUTION: Remove the bits from the machine for safety before repair/maintenance in accordance with the instruction manual!

Fig. 1

Repair

DescriptionCode No. Use for

Item No. Description Portion to lubricate

1R003 1R022 1R023 1R029

1R212

1R228 1R229 1R258 1R288

Retaining ring pliers ST-2N Bearing plate Pipe ring Bearing setting pipe 23-15.2

Tip for retaining ring pliers

1/4" Hex shank bit for M4 1/4" Hex shank bit for M5 V Block Screwdriver magnetizer

Removing/mounting Ring spring Stabilizing Bearing box when removing Ball bearing 6002LLU Stabilizing Crank housing complete when removing Armature Removing Oil seal 15 and Ball bearing 6002LLU from Bearing box

Removing/mounting Ring spring (for modular use with 1R003)

1R225 Bearing extractor 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 Magnetizing Screwdriver when removing Steel balls and Pins

Ring 25

Impact bolt

Tool holder

Compression spring 32

23277

Striker

Piston

Connecting rod

27 O Ring 12 Whole portion

Cylinder Inside surface that Piston and Striker contacts

Whole portion

7 Steel ball 4.8 (3 pcs) Whole portion

23 Steel Ball 7.0 (2 pcs) Whole portion

37 O Ring 18 on Striker

O Ring 18 on Piston Whole portion

32 Ring 29

Inside periphery that contacts 30 Cylinder

17g

39 Pin 7 Cylindrical surface that contacts Connecting rod

Flat washer 22

Crank housing complete Crank room

Whole portion for smooth rotation of Helical gear 36

58 59

68 Armature

Gear portion for smooth rotation of Helical gear 36

AmountLubricant

Makita grease

N.No.2

Makita grease

N.No.1

Makita grease

R.No.00

a little

Crank shaft

Bearing box

Helical gear 36

a little

Motor housing

P 3/17

[3] DISASSEMBLY/ASSEMBLY [3] -1. Chuck Section

Repair

DISASSEMBLY

M5x20 Pan head screw (2 pcs)

Handle section

Cap 38

Do the reverse of the disassembling steps.

2) Remove Cap 38 with slotted screwdriver.

4) Remove Chuck cover and Compression spring 42.

Steel ball guide

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.

Disassemble the Chuck section as described in Figs. 2 and 3.

5x25 Tapping screw (2 pcs)

Fig. 2

Fig. 3

Change ring

Guide washer

Conical compression spring 21-29

Ring 21

Crank housing complete

Disconnect Connector housing of Controller from Motor housing.

Compression spring 42

Chuck cover

3) Remove Ring spring 19 with 1R212 and 1R003 while pressing down Chuck cover.

5) Remove Steel ball 7 (2 pcs) using screwdriver magnetized with 1R288 while pressing down Ring 21.

7) Change ring can now be removed.

6) The parts inside Change ring can be removed.

Ring 21

Steel ball 7 (2 pcs)

Screwdriver magnetized with 1R288

Chuck cover

Ring spring 19

1R212 and 1R003

Note:

Be sure to press down Chuck cover or it will pop off due to the pressure of Compression spring 42.

Remove Barrel cover support and Barrel cover.

P 4/17

[3] DISASSEMBLY/ASSEMBLY [3] -2. Barrel, Tool Holder, Cylinder Section

Repair

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.

Crank housing cover

Ring spring 43

M4x25 Hex socket head bolt (1 pc)

Steel ball 4.8 (3 pcs)

Remove Crank housing cover. Remove Ring spring 43

with slotted screwdriver.

Remove Steel ball 4.8 (3 pcs) from each hole of Ring 25 with slotted screwdriver.

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.

Barrel section can now be separated from Crank housing complete by unscrewing four M5x25 Hex socket head bolts with 1R229.

Ring 25

Barrel

1R229

Tool holder

Cylinder section

O Ring 48

Fig. 4

Fig. 5

Fig. 6

Screwdriver magnetized with 1R288

Barrel cover support

Barrel cover

M5x25 Hex socket head bolt (4 pcs)

Barrel section

Turn counterclockwise.

Ring 25

Barrel

Tool holder

P 5/17

[3] DISASSEMBLY/ASSEMBLY [3] -2. Barrel, Tool Holder, Cylinder Section

Repair

DISASSEMBLY

Ring 39

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

Urethane ring 26

Ring spring 37

Rod 2.5 (3 pcs)

Tool holder

Impact bolt section

Pin 6 (3 pcs)

Cylinder section

Fig. 7

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.

Note: Pin 6 can be removed as described below if it is difficult to remove.

1. Apply magnetized screwdriver to Pin 6.

Cylinder

Pin 6

Tool holder

3. Remove Pin 6 using magnetized screwdriver when the two holes are aligned.

Rubber ring 13

Disassembling Impact Bolt Section Disassembling Cylinder Section

Flat washer 12

After removing O Ring 26, the following parts can be removed from Cylinder: Cup washer 29, Compression Spring 32, Ring 29

Impact bolt

Fig. 8

Ring 29

Compression Spring 32

Cylinder

Cup washer 29

O Ring 26

3) Separate Tool holder from Cylinder section as described in Fig. 7.

4) Disassemble Impact bolt and Cylinder section as described in Fig. 8.

Striker

Cylinder section

Pin 6 (3 pcs)

Screwdriver, magnetized with 1R288

2. Align the through hole of Tool holder with that of Cylinder by pushing Tool holder.

Screwdriver, magnetized with 1R288

P 6/17

[3] DISASSEMBLY/ASSEMBLY [3] -2. Barrel, Tool Holder, Cylinder Section

Repair

ASSEMBLY

Fig. 9

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.

ASSEMBLY

Do the reverse of the disassembling steps.

DISASSEMBLY

[3] -3. Electrical Parts in Handle Section

Correct Wrong

Rubber ring 13

Impact bolt Flat washer 12

Rubber portion

Metal portion

Rubber portion

Metal portion

Rubber ring 13

Impact bolt Flat washer 12

1) Disassemble Handle section as described in Fig. 2

2) The electrical Parts can be replaced as described in 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.

Fig. 10

Handle cover

Handle base

4x18 Tapping screw (1 pc)

Handle

Controller

Switch

4x18 Tapping screw (1 pc)

Power supply cord

Strain relief

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