Makita HR2641 Manual

CONCEPT AND MAIN APPLICATIONS

Model HR2641 is a 26mm (1") D-handle combination hammer

developed based on model HR2621 to enhance Operation mode

change lever.

Its main features are:

• Other features except the modification of Operation mode change lever

remain the same as model HR2621.

• 3 modes (Rotation only/ Rotation with hammering/ Hammering only)

• AVT (Anti-Vibration Technology) is equipped to obtain extremely low vibration.

Voltage (V) Current (A) Cycle (Hz) Continuous Rating (W) Max Output (W)

Input Output

110 7.7 50/60 800 370 650

120 8.0 50/60 N/A 370 650

220 3.8 50/60 800 370 650

230 3.7 50/60 800 370 650

240 3.5 50/60 800 370 650

Model No. HR2641

0 - 1,100

0 - 4,500

Shank type Adapted for SDS-PLUS shank bits

Chuck type One-touch sliding chuck

Capacities:

mm (")

Concrete

TCT bit 26 (1)

Core bit 68 (2-11/16)

Diamond core bit 80 (3-1/8)

Steel 13 (1/2)

Wood 32 (1-1/4)

2.4

Operation mode 3 modes

(Rotation only/ Rotation with hammering/ Hammering only)

Variable speed control Yes (by trigger)

Rotation reversing facility Yes

Torque limiter Yes

LED Job light No

Protection from electric shock Double insulation

Power supply cord: m (ft) Europe, North America: 4.0 (13.1), Australia, Brazil: 2.0 (6.6),

Other countries: 2.5 (8.2)

Weight according to

EPTA-Procedure 01/2003*: kg (lbs) 3.1 (6.8)

Dimensions: mm ( " )

Length (L) 422 (16-5/8)

Width (W) 76 (3)

Height (H) 156 (6-1/8)

TECHNICAL INFORMATION

PRODUCT

P 1/ 25

Model No.

Description 26mm (1") Combination Hammer

HR2641

Specification

Impact energy according to EPTA 05/2009: J

(ft.lbs)

No load speed: min.ˉ¹= rpm

Impacts per minute: minˉ¹= ipm

OFFICIAL USE

for ASC & Sales Shop

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

Grip drills

Grip drill holder

Drill chuck ass'y

Chuck adapter assembly

Drill chuck S13

Chuck key S13

SDS-Plus hammer chuck 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

Standard equipment

Optional accessories

Depth gauge

Dust cup (for some countries only)

Quick change drill chuck (keyless)

Side grip

Carrying case (plastic or aluminum)

Note: The standard equipment may vary by country or model variation.

P 2/ 25

Repair

[1] NECESSARY REPAIRING TOOLS

CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.

P 3/ 25

Code No. Description Use for

1R003 Retaining ring S pliers ST-2N removing Ring spring 14

1R032

1R034

1R045

1R164 Ring spring setting tool A mounting Oil seal 25 to Gear housing complete

removing Oil seal 25 from Gear housing complete

1R212

1R228

1R232

1R252

1R258

1R269

1R273

1R281

1R369

1R388

Tip for Retaining ring pliers

1/4” Hex. shank bit for M4 removing / assembling M4 Hex socket head bolt

Pipe 30

Round bar for arbor 30-100

V block supporting Gear housing complete when assembling Oil seal 25

Bearing extractor removing Ball bearings 6000LLB, 627DDW

Ring spring 26 setting tool B

Round bar for arbor 7-50

Jig for Spiro lock washer

Ring spring extractor

Piston cylinder

Bearing setting plate 8.2

Bearing setting plate 12.2

Gear extractor (large) removing/ assembling Spiro lock washer 30

removing Ring spring 28

assembling Ring spring 28 to inner groove of Tool holder complete

Note: Prepare another Piston cylinder for repair.

Do not use Piston cylinder once removed from the machine.

removing/ assembling Cup sleeve and Ball bearing 6806LLU from/ to

Gear housing complete

Note: Prepare another Inner housing complete for repair.

Do not use Inner housing complete once removed from the machine.

310345-1

141573-5

assembling Helical gear 26

removing Helical gear 26

1R288 Screwdriver magnetizer removing Brush holder unit and two 3x12 tapping screws

assembling Cup sleeve and Ball bearing 6806LLU to Gear housing

complete

disassembling Helical gear 26

Inner housing complete

Repair

P 4/ 25

(d) Outer periphery that 28 touches

(h)

[2] LUBRICATION

Fig. 1

Item No. Description Amount

Approx. 2 g

a little

Portion to lubricate

129

Pin 6 Portions to be inserted to 80 and 82

Counter weight

Weight holder guide Portion that Inner housing complete touches

Impact bolt A

O ring 17.5

(c)

(d)

(e)

(f)

(g)

(j) (i)

Piston cylinder

Piston joint Grooves

Guide plate Inside that 48 touches

Inner housing

complete

Drum portion

Entire portion

a little

Makita grease RB No.00

Molybdenum desulfide lubricant

Lubricant

Ring 8

Cap 35 Inner groove portion

Gear housing complete

Steel ball 7.0

Tool holder complete

16 Lip portion of Oil seal 25 (the component of 16 )

Entire portion26

Driving flange29 Cam portion that 30 touches

(b) Inside where 46 reciprocates

(a) Periphery that touches 29 and 30

Inside that 80 touches

(a)

(b)

Spur gear 5130 Gear teeth to engage 55

Striker Entire portion44

O ring 9 Entire portion

Approx. 3g

a little

Approx. 3g

Approx. 16g

Swash bearing 10

Flat washer 7

Clutch cam (2 pcs.) Outer groove

(i) Surface that Ring 8 touches

(j) Ball bearing portion

Cam shaft

Spur gear 10

Helical gear 26 Gear teeth to engage Armature gear

O ring 68 Entire portion

Surface that 56 touches

(g) Drum portion to be inserted into 58

(f) Cam portion

Gear teeth

(h) Pole portion to be inserted into 48

Flat washer 3036

Surface that touches Inner housing complete

(e) Portion to be inserted into 56

(Drum portion between groove and Cam end)

[3] DISASSEMBLY/ASSEMBLY

[3]-1. Bit holder section

DISASSEMBLING

ASSEMBLING

(1) Disassemble Bit holder section as drawn in Fig. 2.

Tool holder section can be assembled by reversing the disassembly procedure. Refer to Fig. 2.

Note: • Washer 16, Ring 21, Guide washer and Conical compression spring 21-29 are not reversible, and therefore,

be careful about the direction. See Fig. 3.

• Apply Makita grease No. RB No. 00 to two Steel balls 7.0 to prevent them from falling off.

Refer to Fig. 1 of page 4.

1. Remove Cap 35 with

a slotted screwdriver.

3. Remove Ring spring 15.

4. Remove Flat washer 17

and Chuck cover.

5. Remove two Steel balls 7

while pressing down Ring 21.

6. Ring 21, Guide washer and

Conical compression spring 21-29

are removed from Tool holder.

2. Remove Ring spring 14 using 1R003 with 1R212.

And then, remove Washer 16.

Repair

1R003

1R212

Chuck cover

Fig. 2

Fig. 3

Cap 35 Slotted

screwdriver

Ring spring 14

Washer 16

Face the chamfered portions toward Cap 35.

Cap 35

1R003

1R212

Ring spring 15

Flat washer 17 Steel ball 7 (2pcs.)

Ring 21

Guide

washer

Guide washer

Conical compression

spring 21-29

Conical compression spring 21-29

Steel ball 7.0 (2 pcs.)

Face the projection toward

Conical compression spring 21-29.

Face the small diameter toward

Motor housing.

P 5/ 25

[3] DISASSEMBLY/ASSEMBLY

[3]-2. Change lever

DISASSEMBLING

1. Insert a slotted screwdriver to the notches of Gear housing

and lever it up alternately.

2. Change lever cap, Change lever with Rubber pin 4

and Leaf spring can be removed.

Disassemble Change lever section as drawn in Fig. 4.

Assemble Change lever section as drawn in Fig. 5.

Repair

3. Face the center top of Leaf spring to

Change lever and assemble the hooks

of Leaf spring to the grooves of Gear

housing.

4. Assemble Change lever cap

to Change cover.

Fig. 4

Fig. 5

Change lever capRubber pin 4

Change lever

Leaf spring

Change cover

Pointer

Mark of Rotation with

hammering mode

Rubber pin 4

Change lever

1. Face Pointer to the opposite of the mark of Rotation with hammering

mode and assemble Change lever with Rubber pin 4 to the hole of

Gear housing.

Note: Never connect Plug to

Outlet when the pointer

faces to the opposite of

the mark of Rotation

with hammering mode.

2. Turn Change lever clockwise 90 degrees.

5. Assemble Change lever cover to Gear housing.

6. Make sure that Change lever cap can be shifted to

each operation mode with a click for the range

designated in a black arrows.

Mark of Rotation mode on

Change lever cover will

come here in the step 5.

Change lever

Grooves of

Gear housing

hooks of

Leaf spring

center top of

Leaf spring

notch of

Change lever cap

Change lever cover

ASSEMBLING

P 6/ 25

notch of Gear housing

[3] DISASSEMBLY/ASSEMBLY

[3]-3. Armature

DISASSEMBLING

Remove Armature as drawn in Fig. 6.

Repair

P 7/ 25

2. Remove four 4x30 Tapping screws and then pull off Gear housing complete.

Armature can be removed together with Gear housing complete.

1. After removing Handle cover,

disconnect entirely Brush hoder

and Carbon brush from commutator

of Armature.

3. Remove Armature by pulling it off by hand.

4. Remove Ball bearing 6000LLB together with Sleeve 9

using 1R269. And then remove Flat washer 10.

5. Remove Labyrinth rubber ring 19, and then,

remove Ball bearing 627DDW using 1R269.

6. Remove Insulation washer.

4x30 Tapping screw

( 4 pcs.)

O ring 25

Note: Pull off Armature by hand. It is because O ring 25 is used as

a support for Ball bearing 6000LLB and striking the edge of

Gear housing comlete is not effective for removing.

Fig. 6

Bruch holder

Handle cover

Insulation washer

Ball bearing

627DDW

Labyrinth

rubber ring 19

Ball bearing

6000LLB

Sleeve 9

1R269

Flat washer 10

1R269

[3] DISASSEMBLY/ASSEMBLY

[3]-3. Armature (cont.)

ASSEMBLING

Assemble by reversing the disassembly procedures. Refer to the notes shown in Figs. 7 and 8.

Repair

Fig. 7 Fig. 8

Note: Be sure to put Wave washer 15 into bearing room

in Motor housing.

P 8/ 25

Flat washer 10

Note: Do not fail to assemble Flat washer 10 before

setting Ball beating 6000LLB in place.

Wave washer 15

Ball bearing 6000LLB

[3] DISASSEMBLY/ASSEMBLY

[3]-4. Torque limiter section

DISASSEMBLING

Compression

spring 4

1. Tap Tool holder complete with a plastic hammer

while holding Gear housing complete by hand.

2. Disassemble Change plate section.

It consists of Change plate A, Change plate B

and Compression spring 5.

3. Stop ring U-6 and Flat washer 7 interferes with pulling out Tool holder section.

So, disassemble Stop ring U-6 with long nose pliers and then remove Flat washer 7.

Lock plate

Note: These parts are easy to fall out of

Gear housing complete, and therefore,

be careful not to lose them.

Note: Change plate section can be

easily removed by hand

because it is just fit to the slit

of Clutch cam.

Repair

(1) Disassemble Bit holder section as drawn in Fig. 2 of page 5.

(2) Disassemble Change lever section as drawn in Fig. 4 of page 6.

(3) Disconnecting Carbon brush from Commutator of Armature, pull off Armature from Gear housing complete as

drawn in Fig. 6 of page 7 and Fig. 7 of page 8.

(4) Tap Tool holder with a plastic hammer. Inner housing section comes out from Gear housing complete.

Then, remove Tool holder section from Inner housing complete. (Fig. 9)

Fig. 9

Change plate section

Stop ring U-6

4. Tool holder section

can be pulled out.

Flat washer 7Long nose pliers

Flat washer 30

on Inner

housing

complete side

Tool holder

section

P 9/ 25

[3] DISASSEMBLY/ASSEMBLY

[3]-4. Torque limiter section (cont.)

DISASSEMBLING

ASSEMBLING

1. Set 1R369 to Tool holder complete.

Hook the 1R369 with 1R045, press down the 1R369 with

1R045 until Spiro lock washer appears.

2. Remove Spiro lock washer 30 by levering it up with

a thin slotted screwdriver from the spiral end along

the spiral direction.

3. Remove Flat washer 30 and Compression spring 31. 4. Remove Spur gear 51 and Driving flange.

Repair

(5) The components of Torque limiter mechanism is secured with Spiro lock washer 30. Therefore, they can be

disassembled from Tool holder complete by removing Spiro lock washer 30. (Fig. 10)

Fig. 10

Spiro lock

washer 30

Spiro lock washer 30

removed by the step 2

Flat washer 30 on

Compression spring 31 side

Note: Be careful not to lose four Steel balls 3

when Driving flange is removed from

Tool holder complete.

ﾊﾞ

Tool holder complete

Assemble by reversing the disassembly procedure.

Note: Do not fail to set two Flat washers 30 in place. The one is placed between Compression spring 31 and Spiro lock

washer 31 as drawn in Fig. 10, the other is placed on Inner housing complete as drawn in Fig. 9 of page 9.

Be sure to apply Makita grease RB No. 00 according to the instruction in Fig. 1 of page 4.

1R369

1R045

Compression

spring 31

Spur gear 51

Driving flange

5. Remove four Steel balls 3.

Steel ball 3

(4 pcs.)

thin slotted screwdriver

P 10/ 25

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