MAKITA DHR241Z, DHR241RFE User Manual

ECHNICAL INFORMATION

Models No.

Description

BHR241

Cordless Combination Hammer

CONCEPT AND MAIN APPLICATIONS

The cordless version of HR2470 has been launched with D-handle for operator's comfort.

This new product is available in the following variations.

Model No.

BHR241RFE

BHR241RF

BHR241Z

The variations for USA, Canada, Mexico and Panama are as follows.

Model No.

BHR241

BHR241Z

Battery

Type Quantity

BL1830

No No No

Battery

Type Quantity

BL1830

No No No

---

Charger

DC18RA

Charger

DC18RA

carrying case

Plastic

Yes

Plastic

Yes

PRODUCT

P 1/ 14

Dimensions: mm (")

Length (L)

Width (W)*

Height (H)

* excludes Grip assembly

417 (16-3/8)

84 (3-5/16)

219 (8-5/8)

Specification

No load speed : (min -1= rpm)

Blows per min, :(bpm=min

Max. Output(W)

Voltage: V

Battery

Chuck Capacity: mm ( " )

Bit Shank

Capacity : mm ( " )

Operation mode R= Rotation only H+R= Hammering with Rotation

H= Hammering only Variable switch

Reverse switch Clutch (Torque Limiter)

Electric Brake

Net Weight : kg (lbs)

Cell and Capacity

Charging Time: min.

Steel

Wood

* Concrete

0 - 1,100

-1)

3.2 (7.0) including Battery BL1830

[3.5 (7.7) measured by EPTA regulation]

0 - 4,000

330

Li-ion 3.0 Ah

22 with DC18RA

10 (3/8)

SDS-plus

13 (1/2)

26 (1-1/16)

20 (13/16)

3 modes

(R/ H+R/ H)

Yes

Yes Yes

Yes

* Concrete: 24 (15/16) for North America

Standard equipment

* Grip assembly ................................... 1 set * Depth gauge (Stopper pole) .............. 1 pc.

Note: The standard equipment for the tool shown above may differ by country.

Optional accessories

* SDS-Plus bits * Taper shank T.C.T bits * Taper shank adapter * Cotter * Drill chuck assembly * Chuck adapter * Drill chuck S13

* Chuck key S13 * Keyless drill chuck * Grip assembly * Scraper Assembly * Cold chisels * Grooving chisels * Scaling chisels

* Bull points * Dust Cup * Grease Vessel 30g * Blow out bulb * Safety goggle * Dust extractor attachment * Joint 25

* Charger DC18RA * Charger DC18SC * Charger DC24SA * Charger DC24SC * Battery BL1830 * Hammer service kit

P 2/ 14

[1] NECESSARY REPAIRING TOOLS

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

Repair

DescriptionCode No.

1R003 Retaining ring S pliers SR-2 Removing / Installing Ring spring 19

Removing Ring spring 29

Removing Helical gear 25 from Cam shaft

Disassemble Oil seal 25 and Needle bearing complete from Gear housing complete

Disassemble Ball bearing 608ZZ from Cam shaft

Installing Helical gear 25 to Cam shaft

Installing Oil seal 25 to Gear housing complete

Installing Needle bearing complete to Gear housing complete

Holding Tool holder complete

1R004 Retaining ring S pliers ST-2N

1R022

1R023

Bearing plate for Arbor press

Pipe ring (for Arbor press)

1R033

1R032

Bearing setting plate 10.2

Bearing setting plate 8.2

1R038 Armature holder 32 set for vise

1R164 Ring spring setting tool A

1R165 Ring spring setting tool B

1R212

Tip for Retaining ring pliers Attaching to 1R003 for removing Ring spring 19

1R232 Pipe 30

1R252 Round bar for Arbor 30-100

1R269 Bearing extractor

1R281 Round bar for Arbor 7-50

Removing Striker from Tool holder complete

Removing Ring 8 from Cam shaft

Removing / Installing Retaining ring S-7 from / to Cam shaft

Removing / Installing Ring spring 29 from / to Tool holder complete

1R291 Retaining ring S and R pliers

1R306 Ring spring removing jig

Use for

[2] LUBRICATION

Apply the following grease to protect parts and product from unusual abrasion. * Makita grease R No.00 to the portions marked with black triangle * Molybdenum disulfide lubricant to the portions marked with gray triangle

Fig. 1

Item No. Description Portion to lubricate Lubricant Amount

a little

(a) (c) (d)

(e)

17 28

Needle bearing complete

29 30

34 37

Sleeve 9

Impact bolt

Cushion ring 13

(b)

Cap 35

O ring 17

Change lever

Gear housing complete

Spur gear 51

Steel ball 7

Tool holder complete

Lip portion where Bit is inserted

Whole portion

Pin portion

Inside where Swash bearing section rotates

(a) Teeth portion, (b) Surface where Clutch portion of 30 Tool holder complete contacts

Whole portion (c) Surface where Needle bearing complete contacts

(d) Surface where Plane bearing 28 of 63 Inner housing complete contacts

(e) Inside where 41 Piston cylinder reciprocates

Ring 10

O ring 9

Surface where Cushion ring 13 contacts

Whole portion

Tool Holder Section

Makita grease R No. 00

[2] LUBRICATION (cont.)

Repair

P 3/ 14

Fig. 2

Item No. Description Portion to lubricate Lubricant Amount

Striker

Ball bearing 606ZZ

Compression spring 7

Disassemble Tool holder section as illustrated in Fig. 3.

Retaining ring S-7

Piston joint

Armature

Flat washer 12

Swash Bearing Section

52 53

(f)

(g)

(h)

(g)

(k) Crank room

(i)

(j)

Clutch cam

Bearing portion

(k) Crank room

17g

Swash bearing 10

Helical gear 25

Gear housing complete

Inner housing complete

O ring 16

Piston cylinder

Whole portion

Makita grease R No. 00

Molybdenum disulfide lubricant

Makita grease R No. 00

a little

Pole portion which is inserted into Piston joint

49 Spur gear 10 Gear teeth where 28 Spur gear 51 engages (Refer to Fig. 1.)

Teeth portion

Space where Armature's drive end and 53 Helical gear 25 engages

(f) Inside where Striker moves

(g) Hole for accepting Piston joint

(h) Surface where 30 Tool holder complete contacts. (Refer to Fig. 1.)

(i) Outside groove

(j) Side where 52 Swash bearing 10 engages

50 Cam shaft Surface where 51 Clutch cam and 49 Spur gear 10 contact

[3] DISASSEMBLY/ASSEMBLY [3] -1. Tool Holder Section

DISASSEMBLING

Ring 21

Guide washer

Conical compression spring 21-29

Cap 35

Steel ball 7.0

Chuck cover

Ring spring 19

Chuck cover

1R003

1R212

Disassemble Cap 35 and remove Ring spring 19 with 1R003 and 1R212. Note: Replace the tips of 1R003 to those of 1R212.

Ring 21

Disassemble Chuck cover. And remove Steel ball 7.0 while pressing down Ring 21.

After disassembling Steel ball 7.0, the Tool holder section can be disassembled as illustrated above.

Fig. 3

ASSEMBLING

Do the reverse of the disassembling step. Note: Be sure to place the flat portion of Ring spring 19 on Steel ball 7.0. Refer to Fig. 3.

Flat portion

Repair

P 4/ 14

[3] DISASSEMBLY/ASSEMBLY [3] -2. Change Lever

DISASSEMBLING

ASSEMBLING

Change lever Drill mode

Lock button

Pushing Lock button into Change lever, turn Change lever fully to Drill mode until it stops.

Remove Change lever by levering up it with Slotted head screwdriver, inserted between Gear housing complete and Change lever.

Fig. 4 Fig. 5

Fig. 6 Fig. 7

Disassemble Change lever as illustrated in Figs. 4 and 5.

1) Assemble Change lever to Gear housing complete in the order of Figs. 6 and 7.

2) Make sure that Change lever stops at every operation mode exactly after assembling.

Lock plate

Drill mode

Hammer drill mode

large pin of Change lever

small pin of Change lever

Lock plate can be seen through the hole for Change lever insertion before mounting Change lever. When inserting Change lever into Gear housing complete, contact the small pin to this Lock plate as designated in gray color. Change lever can be inserted in Hammer drill mode.

Pushing Lock button into Change lever, turn Change lever fully to Drill mode until it stops.

Pushing Lock button into Change lever, tap Change lever. Change lever can be assembled to Gear housing complete.

Lock button

Repair

P 5/ 14

bearing room of Gear housing complete

4x40 Tapping screws (4 pcs.)

Gear housing complete

Holder cap cover Motor housing

complete

Ball bearing 6000DDW of Armature (behind the Fan)

[3] DISASSEMBLY/ASSEMBLY [3] -4. Armature

1) Remove Holder cap cover by inserting Slotted screwdriver between Holder cap cover and Motor housing complete. (Fig. 8) Then remove Holder cap and Carbon brushes.

2) Seperate Gear housing complete from Motor housing complete by loosening 4x40 Tapping screws (4 pcs.). Armature is left on Gear housing complete in this step. (Fig. 9)

3) Pull Armature out from Gear housing complete by hand. (Fig. 10) This way is easier than using Plastic hammer to strike Gear housing portion. (Ball bearing 6000DDW of Armature is tightly fit into the bearing room in Gear housing complete using O ring 26. )

Do the reverse of the disassembling step.

DISASSEMBLING

ASSEMBLING

Fig. 10Fig. 9Fig. 8

DISASSEMBLING

Fig. 11

Fig. 12

1) Disassemble Tool holder section as illustrated in Fig. 3.

2) Disassemble Change lever as illustrated in Figs.4 and 5.

3) Separate Gear housing complete from Motor housing. Then remove Armature from Gear housing complete. (Figs. 8 to 10)

4) Disassemble Torque limiter section as illustrated in Figs. 11 and 12.

5) Remove the Ring spring 29 to separate Washer 31, Compression spring 32 and Spur gear 51 (Figs. 13 and 14)

[3] -5. Torque Limiter Section

Remove Torque limiter section from Piston cylinder and Inner housing complete.

Remove Torque limiter section from Gear housing complete by striking Chuck assembling portion with Plastic hammer.

Flat washer 28

Piston cylinder

Inner housing complete

Torque limiter section

Gear housing complete

Torque limiter section

Ball bearing 606ZZ remains fixed in Gear housing complete.

Assemble two pcs. of 1R022 to 1R306 and hold them to the ram of arbor press. Put Torque limiter section on the table of arbor press.

While compressing Compression spring 32 by pressing down Washer 31 using arbor press, remove Ring spring 29 using 1R004. Spur gear 51 can be removed.

Washer 31

Ring spring 29

Compression spring 32

Ring spring 29

1R004

Table of arbor press

Fig. 13 Fig. 14

1R022 (2 pcs.)

1R036 ram of arbor press

Spur gear 51

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