Makita BDF441 Technical Information page 3

R
epair
[3] -2. Gear Assembly and Motor Section
DISASSEMBLING
1) Remove Rear cover and take off Carbon brush from Brush holder complete. (Fig. 6)
Fig. 6
A
Rear cover
2) Unscrew four PT4x20 Tapping screws to disconnect
Gear assembly from Housing. Then by removing
eight PT3x16 Tapping screws, separate Housing R
from Housing L. (Fig. 7)
3) Pull off Heat sink from Yoke unit of the Motor section.
Then remove the assembly of the Gear section and
the Motor section from housing L. (Fig. 8)
3) Remove Brush holder complete from Armature,
then separate the Motor section from the Gear section.
(Fig. 9)
4) Put the Motor section on a work bench so that the
drive end of Armature touches the work bench.
Then separate yoke unit from armature by pulling it
down towards the work bench. (Fig. 10)
Fig. 8
Assembly of the Gear section
and the Motor section
Tapping screw
bind PT 3x16
Fig. 7
Housing L
Fig. 9
Speed change lever assembly
Heat sink
Fig. 10
Yoke unit
[Brush holder section (View from A)]
Carbon brush
Torsion spring
Carbon brush
1. Move the tail of Torsion spring onto the notch
of Brush holder.
2. Then pull off Receptacle from Brush holder.
Tapping screw bind PT4x20 (4 pcs)
Gear section (= Gear assembly)
Housing R
Motor section
Gear section
P 3 / 7
1 2
Tapping screw bind
PT3x16 (8 pcs)
Brush holder complete