Hitachi M 12VC Technical Data And Service Manual page 11

(4) Disassembly of the Armature Ass'y 120 V [31] (Fig. 7)
First, remove the Collet Chuck 1/2" [36] (or [501]) with the Wrench 23 mm [506] and the Wrench 16 mm [505].
And remove the Thrust Nut [35] with wrenches. Then remove the Armature Ass'y 120 V [31] from the Housing
[32]. To remove the Magnet [26] from the Armature Ass'y 120 V [31], being very careful not to damage the
magnet component, fit a 14 mm wrench onto the hexagonal portion of the Magnet [26], and loosen and
remove it from the Armature Ass'y 120 V [31].
Magnet [26]
Armature Ass'y 120 V [31]
Carbon Brush (1 Pair) [19]
Stator Holder Ass'y [22]
Housing [32]
Brush Cap [18]
Fig. 6
Fig. 7
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Housing [32]
Thrust Nut [35]
Collet Chuck 1/2" [36]