Makita BTD141 Series Technical Information page 7

R
epair
[3] -3. Disassembling/Assembling Motor Section (cont.)
ASSEMBLING
Do the reverse of disassembling steps.
Important:
1) 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, Motor section cannot be assembled to Housing (L).
2) Because Yoke unit is a strong magnet, when assembling Armature to Yoke unit, be sure to hold Commutator portion
as illustrated to left in Fig. 19. Do not hold Armature core as illustrated to right or your fingers will be pinched
between Yoke unit and Fan of Armature that is pulled strongly by the magnet force of Yoke unit.
Fig. 18
[Correct]
notch
3) Assemble Motor section and Hammer section
to Housing (L) as described in Figs. 20, 21.
Fig. 21
Brush holder complete must be so mounted that
its flat portion is 90 degrees to the edge of Housing (L).
edge of
Housing (L)
Housing (L)
Fig. 19
[Wrong]
90 degrees
flat portion of
Brush holder complete
Brush holder
complete
Fit the end surface of Yoke unit to
this rib of Housing (L).
[Correct]
Fig. 20
Fit the projection on Housing (L) in the notch on Yoke unit.
notch
Fit the end surface of Yoke unit to
this rib of Housing (L).
Yoke unit
rib
rib
(Fig. 18)
[Wrong]
Your fingers can be pinched
and injured.
projection Housing (L)
Hammer
case side
stopper (protrusion)
of Hammer case comp.
Switch
Stopper must face
towards Switch side.
P 7/9