Motor Section - Makita BFS440 Technical Information

R
epair
[3] DISASSEMBLY/ASSEMBLY

[3] -5. Motor Section

DISASSEMBLING
1) Remove Housing R (Fig. 4)
2) Disassemble Armature from the machine as illustrated in Figs. 12 and 13.
Fig. 12
2 1
1. Move the tail of Torsion spring
onto the notch of Brush holder.
2. Then pull off Receptacle from
Brush holder, then remove
Carbon brush.
ASSEMBLING
1) Insert Armature into Yoke unit as described in Figs. 14 and 15.
2) Assemble Brush holder complete to the commutator end of Armature.
Fig. 14
Yoke unit is not reversible when assembled
to Armature.
Be sure to assemble so that the notch in
Yoke unit is positioned on the drive-end
of Armature.
If assembled wrong, the Motor section
cannot be assembled to Housing L.
[Correct]
Gear
notch
Carbon
brush
Torsion
spring
Carbon
brush
Fig. 15
Because Yoke unit is a strong magnet, when assembling Armature
to Yoke unit, be sure to hold the commutator portion as illustrated
to left. 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.
[Wrong]
Fig. 13
(Fig. 12)
[Correct]
Your fingers will be pinched
and injured.
P 5/ 7
Brush holder
complete
Armature
Yoke unit
[Wrong]