Makita HR2641 Manual

W
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)
H
L
TECHNICAL INFORMATION
PRODUCT
P 1/ 25
Model No.
Description 26mm (1") Combination Hammer
HR2641
Specification
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
44
45
42
(c) Inside that 44 touches
(d) Outer periphery that 28 touches
(h)
46
47
[2] LUBRICATION
Fig. 1
Item No. Description Amount
Approx. 2 g
a little
a little
a little
Portion to lubricate
16
129
30
81
Pin 6 Portions to be inserted to 80 and 82
Counter weight
Weight holder guide Portion that Inner housing complete touches
38
Impact bolt A
26
O ring 17.5
(c)
(d)
(e)
(f)
(g)
(j) (i)
Piston cylinder
Piston joint Grooves
Guide plate Inside that 48 touches
56
52
Inner housing
complete
Drum portion
Entire portion
57
55
64
65
58
a little
Makita grease RB No.00
Molybdenum desulfide lubricant
Lubricant
Ring 8
40
Cap 35 Inner groove portion
1
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
28
82
81
80
Inside that 80 touches
28
(a)
(b)
Spur gear 5130 Gear teeth to engage 55
38
45
Striker Entire portion44
O ring 9 Entire portion
42
46
47
48
Approx. 3g
a little
a little
a little
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
52
55
56
57
58
64
65
Gear teeth
(h) Pole portion to be inserted into 48
Flat washer 3036
36
Surface that touches Inner housing complete
57
82
80
48
(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
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
Ring 21
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
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
5
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