Makita BTW104, BTW074 dimensions Armature, Disassembling

P 4/ 15

Repair

[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	2. Loosen two M3x12 Pan head screws and
Hammer case complete from Housing set.	separate Rear cover from Housing set.
Hammer case complete
	Rear cover

M4x22

Pan head screw Hammer case (4 pcs.) complete

3.Loosen seven M3x20 Pan head screws and separate Housing set (R) from Housing set (L).

	M3x20
Housing set (R)	Pan head screw
	(7 pcs.)

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	Internal gear case
	Housing set (L)

Fig. 4

1. Shift the tail of Torsion spring		Tail of
from the top of Carbon brush to			Carbon
the notch of Brush holder.		Torsion spring
			Brush
Then, Carbon brush is free from
the pressure of Torsion spring.
Tail of	Torsion		Notch
Torsion Spring	Spring
Carbon
Brush
	Notch

2. Take out Carbon brushes.

Then, disassemble Carbon brush Armature and Yoke unit

from Brush holder.

Carbon

Brush

Armature

Yoke unit

Brush holder