Makita MAKSTAR BTW250 Series Technical Information page 3

R
epair
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Disassembling/Assembling Hammering Mechanism
DISASSEMBLING
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.
Fig. 3
A
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.
Fig. 4
134848-9
1R041
134848-9
Fig. 2
Hammer case cover
[Brush holder section (Viewed from A)]
Carbon
brush
Torsion
spring
Carbon
brush
1R223
1R224
Fit 134848-9 over
this hex portion.
Hammer case section
Bearing box complete
1R041
Vise
Bumper Hammer case
1. Move the tail of Torsion spring
2. Then pull off Receptacle from
Note:
Do the above steps while pushing
1 2
Torsion spring in the direction of
the arrow so that it cannot slip
out of position.
P 3 / 8
Rear cover
Tapping screw
PT3x16 (2 pcs)
Screw M4x12
Belt clip
onto the notch of Brush holder.
Brush holder.
Hammer case complete
Hammering mechanism
Internal gear 51
O ring 40
Bearing box complete