Makita MAKSTAR BTW250 Series Manual

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
No
Yes
Plastic
carrying case
No
BTW250RFE 2
Battery
BTW250 BTW251
BTW251
BTW251Z
BL1830DC18RA
No No
Model No. type quantity Charger
No All countries
Yes
Plastic
carrying case Offered to
No
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
15
21
17
23
15
21
23
17
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
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
A
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
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.
pin
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)
pin
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.
20 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