Makita BO6040 Technical Information page 2

R
epair
< 1 > Replacing armature and spiral bevel gear 9
1) Take off tapping screw 4x18 and detach rear cover from motor housing.
And detach carbon brush as illustrated in Fig1.
2) Put the torsion spring installed on brush holder, on the side of brush holder after detaching carbon brush
as illustrated in Fig.2. This is necessary for avoiding to scratch the armature's commutator, when armature is
pulled out from motor housing.
The torsion spring put on the side of
brush holder
It is not necessary to remove brush holder itself, when removing armature.
3) After pulling out armature from motor housing, remove retaining ring 6 with retaining ring plier, and detach
spiral bevel gear 9 as illustrated in Fig.3.
Gear housing cover
Retaining ring 6
Spiral bevel gear 9
4) Remove armature from gear housing cover
by pressing the armature shaft with arbor press
as illustrated in Fig.4.
5) Take reverse step of the above, when
assembling armature and spiral bevel gear.
Carbon brush
Rear cover
Motor housing
Fig. 1
Fig.2
Armature
Fig.3
Tapping screw 4x18
The torsion spring positioned as illustrated
in Fig.2A can scratch the armature's commutator.
Torsion spring
Brush holder
Motor housing
Bal bearing 6001LLB
Flat washer 12
Gear housing cover
Fig.4
P 2 / 10
Fig.2A
Press
Armature