Makita MAKSTAR BTW250 Series Handbuch

Models No.

Description

PRODUCT

CONCEPT AND MAIN APPLICATIONS

Specification

Standard equipment

Optional accessories

P 1 / 8

Dimensions: mm (")

Width (W)

Height (H)

Length (L) 165 (6-1/2)

Model BTW250, BTW251

79 (3-1/8)

234 (9-1/4)

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

BTW250, BTW251

Cordless Impact Wrench

Models BTW250 and BTW251 are compact and lightweight

cordless impact wrenches, featuring maximum fastening torque

of 230N.m (170ft.lbs).

BTW250 is powered by Model BL1430 14.4V Li-ion battery,

and BTW251 by Model BL1830 18V Li-ion battery.

These products are available in the following variations:

Belt clip ................................... 1

Plastic carrying case ................ 1

Sockets

Extension bar

Universal joint

Bit adapter assembly

Battery BL1430 (for BTW250 only)

Battery BL1830 (for BTW251 only)

Fast charger DC18RA

Charger DC24SA

Charger DC24SC (for BTW250 only)

Battery

Specification

Net weight**: kg (lbs)

Capacity: Ah

Cell

Voltage: V 18

Driving shank

No load speed: min.-1=rpm

Impacts per min.: min.-1=ipm

0 - 2,200 0 - 2,100

0 - 3,200

1.7 (3.7)

14.4

1.6 (3.5)

3.0

Li-ion

235 280

Max. fastening torque*: N.m (in.lbs) 230 (2,040)

12.7mm (1/2") Square

*catalog value (torque at 6 seconds after seating) **with battery

Max output (W)

Model BTW250 BTW251

TECHNICAL INFORMATION

The items listed below in "Standard Equipment" also come with the above items.

BTW250

BTW251

BTW250Z

BL1430DC18RA

No No

Model No. type quantity

Charger

Yes

Plastic

carrying case

BTW250RFE 2

Battery

BTW250 BTW251

BTW251

BTW251Z

BL1830DC18RA

No No

Model No. type quantity

Charger

No All countries

Yes

Plastic

carrying case Offered to

USA, Canada, Mexico, Panama

All countries other than

the four listed above

BTW251RFE 2

Battery

P 2 / 8

Repair

[2] LUBRICATION

Apply the following grease to protect parts and product from unusual abrasion:

Makita grease N. No.2 to the portions designated with the black triangle

Makita grease FA. No.2 to the portions designated with the gray triangle

[1] NECESSARY REPAIRING TOOLS

CAUTION: Remove the battery from the machine for safety before repair/ maintenance !

Code No.

1R045

Description

Gear extractor (Large) Disassembling Hammering mechanism

Magnetizing screwdriver for removing Steel balls

1R346 Center attachment for 1R045

1R288 Screwdriver magnetizer

Use for

Fig. 1

Anvil Surface that contacts Hammer case complete

Whole surfaceSteel ball 5.6 (2 pcs)

Whole surfaceSteel ball 3.5 (24 pcs)

Spindle Put 2g of Makita grease N. No.2 in the hole.

Surface that contacts Anvil

Item No.

Description Portion to lubricate Grease

1R041 Vise plate (2 pcs)

1R223 Torque wrench shaft

1R224 Ratchet head

Socket 32-50 (2 pcs)134848-9

Removing Hammer case complete

Hammer case complete

Hammer

Armature

P 3 / 8

Repair

[3] DISASSEMBLY/ASSEMBLY

[3] -1. Disassembling/Assembling Hammering Mechanism

Fig. 3

1) Remove Belt clip by unscrewing Screw M4x12.

Remove Bumper and Hammer case cover by hand,

Remove Rear cover by unscrewing two PT3x16

Tapping screws. (Fig. 2)

2) Disconnect Carbon brush from Commutator

as illustrated in Fig. 3.

3) Separate Housing (R) from Housing (L) by removing eight PT3x16 Tapping screws.

4) Remove the assembly of Hammer case section and Motor section from Housing (L), and separate Hammer case

section from Motor section.

5) See Fig. 4. Attach 1R041 (2 pcs) to vise. Fix 134848-9 in vise securely. Put Hammer case section on 134848-9

while fitting the hexagonal portion of Bearing box complete in 134848-9. Fit another 134848-9 over the hexagonal

portion of Hammer case complete. By turning 134848-9 clockwise with 1R223 and 1R224, the Hammer case section

can be disassembled as illustrated to right.

1 2

A[Brush holder section (Viewed from A)]

Fig. 4

DISASSEMBLING

Rear cover

Tapping screw

PT3x16 (2 pcs)

Hammer case

Belt clip

Fig. 2

Screw M4x12

Carbon

brush

Carbon

brush

Torsion

spring

1. Move the tail of Torsion spring

onto the notch of Brush holder.

2. Then pull off Receptacle from

Brush holder.

Note:

Do the above steps while pushing

Torsion spring in the direction of

the arrow so that it cannot slip

out of position.

Hammer case section

Fit 134848-9 over

this hex portion.

1R041

Vise

134848-9

1R041 Bearing box complete

Internal gear 51

O ring 40

Bearing box complete

Hammering mechanism

Hammer case complete

Hammer case cover

Bumper

1R223

1R224

134848-9

P 4 / 8

Repair

[3] -1. Disassembling/Assembling Hammering Mechanism (cont.)

Hammer

Spindle

1R346

1R045 top of Cam groove on Spindle

notch in Hammer

Steel ball 5.6

6) Install 1R346 on 1R045. (Fig. 5)

7) Set 1R045 on Hammering mechanism (= assembled unit of Hammer, Spindle,

Spur gears, Steel balls, etc.) as illustrated in Fig. 6.

Then turn the handle of 1R045 clockwise to lower Hammer to the full.

8) Align the notch in Hammer with the top of Cam groove on Spindle.

Then take two 5.6 Steel balls out of spindle using tweezers or a slotted

screwdriver magnetized using 1R288. (Fig. 7)

9) Remove 1R045 by turning the handle counterclockwise.

10) Remove Spindle, Compression spring 25 and Cup washer 14 from Hammer as illustrated in Fig. 8.

Important: Be sure to lower the Hammer side in order to prevent Steel balls in Hammer from scattering around.

11) Now Steel ball 3.5 can removed from Hammer. (There are twenty-four 3.5 Steel balls in the groove on the inside

of Hammer.)

Note: As illustrated in Fig. 9, the groove of Hammer is designed to have a space equivalent to about one 3.5

Steel ball when twenty-four 3.5 Steel balls are set in place.

Fig. 5

1R045

1R346

Fig. 6 Fig. 7

Fig. 9

Hammer

Steel ball 3.5

(24 pcs)

space equivalent to

about one 3.5 Steel ball

Fig. 8

Hammer

P 5 / 8

Repair

[3] -1. Disassembling/Assembling Hammering Mechanism (cont.)

Do the reverse of assembling steps.

Note:

1) Assemble by piling up component parts on Bearing box complete as illustrated in Fig. 10.

2) Make sure that twenty-four 3.5 Steel balls are in place inside Hammer.

3) Make sure that O ring 40 is assembled to Bearing box complete before assembling Internal gear 51. (Fig. 11)

4) Internal gear 51 is not reversible when assembled to Bearing box complete. Make sure that the stepped end of

Internal gear 51 is positioned on the Bearing box complete side. (Fig. 11)

5) Assemble Hammer case complete to Bearing box as illustrated in Fig. 12.

Fig. 12

ASSEMBLING

Fig. 11Fig. 10

Internal gear 51

Bearing box complete

O ring 40

stepped end

Fit Hammer case complete over Internal gear 51

while aligning the four grooves on the inside of

Hammer case complete with the corresponding

projections on Internal gear 51.

Fasten Hammer case complete to Bearing box

complete to the recommended torque of

30 - 40 N.m by turning counterclockwise

using 1R224 and No.1R223,

Internal gear 51

O ring 40

Bearing box complete

Hammering mechanism

Hammer case complete

Bearing box complete

134848-9

four projections

Internal gear 51

Hammer case complete

four grooves on

the inside surface

P 6 / 8

Repair

[3] -2. Disassembling/Assembling Motor Section

[3] -3. Assembling F/R Change Lever to Switch

1) Separate the assembly of Armature and

Yoke unit from the machine.

(Refer to 1) to 4) of [3] -1.)

2) Put the assembly of Yoke unit and Armature

on a work bench with the drive end of the

Armature down.

Separate Yoke unit from armature by pressing

down towards the work bench. (Fig. 13)

ASSEMBLING

DISASSEMBLING Fig. 13

Yoke unit

Do the reverse of disassembling steps.

Important:

1) Yoke unit is not reversible when assembled to Armature. Be sure to assemble with the notch in Yoke unit on the

drive-end of Armature. If assembled wrong, the Motor section cannot be assembled to Housing (L). (Fig. 14)

2) Because Yoke unit is a strong magnet, when assembling Armature to Yoke unit, be sure to hold the commutator portion

as illustrated to left in Fig. 15. Do not hold the Armature core as illustrated to right or your fingers will be pinched

between Yoke unit and the fan of Armature that is pulled strongly by the magnet force.

Fig. 14 Fig. 15

3) When assembling the Motor section to Housing (L),

fit the notch in Yoke unit onto the projection on

Housing (L) (Fig. 16)

Your fingers can be pinched

and injured.

[Wrong][Correct] [Wrong][Correct]

Notch

Fig. 16

Fig. 17

notch Housing (L)projection

Hammer case complete side

Put the projection on Switch between the prongs of F/R change lever. (Fig. 17)

Projection

Prong

P 7/ 8

Fig. 19

[1] Lead Wire of Carbon Brush

As illustrated to left in Fig. 19, put each Carbon brush into

Brush holder so that its lead wire is placed outside.

Then route the lead wire of Carbon brush through the

outside slot in Brush holder as illustrated to left in Fig. 19.

(Illustrations in Fig. 19 are the Carbon brush section viewed from A.)

[Correct] [Wrong]

Lead wire of Carbon brush

Lead wire correctly routed

Torsion spring

Tail of Torsion spring

Circuit diagram

Color index of lead wires' sheath

Black

Red

Orange

Blue

LED

Light circuit

Brush holder complete

Terminal

Connector

Wiring diagram

Route Lead wire of

Carbon brush through this

outside slot in Brush holder.

Lead wire routed

wrong may interfere

the tail of Torsion

spring.

Switch

Fig. 18

P 8/ 8

Fig. 20

[2] Wiring in Housing

Wiring diagram

Brush holder complete

Put Light circuit in place

so that the orange lead wire

faces toward the Terminal side.

[2] -1. Lead Wires of LED

Connector

Light circuit

lead wire holder

LED

Be sure that the lead wires

of LED are tight here.

As illustrated below, fix the two lead wires (red and black) of LED

with lead wire holders, and route them between the pin and the boss.

boss

Fit the corner of LED in this

corresponding corner of Housing (L).

LED

Connector (large)

Connector (small)

Light circuit

rib

Terminal side

Switch side

Do not cross the lead wires of LED here.

Lead wire

(orange)

lead wire holder

With these lead wire holders,

fix the lead wires connected

to each connector.

20 degrees

[2] -2. Other Lead Wires

Assemble each Connecting

terminal to Switch at approx.

degrees to the vertical.

Switch

The lead wire (blue) from

Connector to Switch has to

be routed inside of this pin.

Put the following lead wires

between the rib and Light circuit.

*Lead wires (red and black) from

Terminal to Connector (small)

*Lead wire (blue) from Switch

to Connector (small)

Terminal

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