Makita BTW074 Technical Information - Page 4
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R
epair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Armature
DISASSEMBLING
(1) Remove Armature section from Housing set as drawn in Fig. 3, and remove Brush holder from Armature in Fig. 4.
Fig. 3
1. Loosen four M4x22 Pan head screws and separate
Hammer case complete from Housing set.
3. Loosen seven M3x20 Pan head screws and
separate Housing set (R) from Housing set (L).
Housing set (R)
Fig. 4
1. Shift the tail of Torsion spring
from the top of Carbon brush to
the notch of Brush holder.
Then, Carbon brush is free from
the pressure of Torsion spring.
Tail of
Torsion Spring
Carbon
Brush
Notch
Hammer case complete
M4x22
Pan head screw
(4 pcs.)
Hammer case
complete
M3x20
Pan head screw
(7 pcs.)
Tail of
Torsion spring
Torsion
Spring
2. Loosen two M3x12 Pan head screws and
separate Rear cover from Housing set.
Rear cover
M3x12
Pan head screw
4. Take out Brush holder and Motor section
(Armature and Yoke unit) together with
Internal gear case from Housing set (L).
Motor section
Brush holder
2. Take out Carbon brushes.
Then, disassemble
Carbon
Armature and Yoke unit
Brush
from Brush holder.
Notch
Carbon
Brush
P 4/ 15
Internal gear case
Housing set (L)
Carbon brush
Armature
Yoke unit
Brush holder