Hitachi DH 24DV Technical Data And Service Manual page 30

Hammer Holder [28]
Second Hammer [26]
(5) Disassembly of the armature and the housing
After disassembly of the striking mechanism section, remove the Machine Screw M4 x 8 [77] from the Grip
Cover [76] and remove the Grip Cover [76] to show the carbon brushes. Hook the Spring [59] on the edge of
the carbon brush tube. Remove the Tapping Screw (W/Flange) D4 x 16 (Black) [52] from the Inner Cover
Ass'y [39]. Then the Inner Cover Ass'y [39] can be removed together with the Armature and Pinion Ass'y DC
24 V [55]. At this time, be careful not to damage the carbon brushes. The Inner Cover Ass'y [39] and the
Armature and Pinion Ass'y DC 24 V [55] can be removed just by pressing the Pinion [50] slightly with a press
because there is an interference of the O-ring [53]. The housing is constructed of two parts. Remove the
Tapping Screw (W/Flange) D4 x 20 (Black) [65] to disassemble the housing.
(6) Disassembly of the carbon brush holder
After disassembly of the housing, remove the Tapping Screw (W/Flange) D4 x 16 (Black) [52] to disassemble
the carbon brush holder.
(7) Replacement of the carbon brushes
Remove the Grip Cover [76] to show the carbon brushes. Pinch the terminal of the Carbon Brush [61] with a
pair of long-nose pliers as shown in Fig. 15 and pull it out of the carbon brush holder. Hook the Spring [59] on
the Carbon Brush [61] with a flat-blade screwdriver and remove the Carbon Brush [61].
Tap with a hammer.
O-ring (1AP-20) [27]
O-ring (B) [29]
Damper (A) [30]
Long-nose
pliers
Punch
5-mm diameter hole (2 pcs.)
Damper Holder [32]
O-ring (C) [31]
Stopper Ring [33]
Fig. 14
Terminal
Carbon
Brush [61]
Fig. 15
--- 27 ---
Spring [59]
Flat-blade
screwdriver