Hitachi DH 24DV Technical Data And Service Manual page 29

(2) Disassembly of the tool retainer
Slide the Grip [3] fully in the arrow direction as shown in Fig. 12 and remove the Front Cap [1]. Pulling the
Grip [3] as shown in Fig. 13, remove the Stopper Ring [2] with a retaining ring puller. Then the Grip [3], Ball
Holder [4], Steel Ball D7.0 [20], Holder Plate [5], Holder Spring [6] and Washer (B) [7] can be removed from
the Cylinder [21].
Front Cap [1]
Fig. 12
(3) Disassembly of the cylinder and the second gear (slip mechanism section)
Remove the Gear Cover [10] from the Inner Cover Ass'y [39] and remove the entire tool retainer. Remove the
Retaining Ring for D20 Shaft [8] with a retaining ring puller. Stand the Gear Cover [10] in this state and pull
out the Cylinder [21] from the Gear Cover [10] with a hand press. Then Sleeve (A) [14] can be removed from
the Cylinder [21]. Remove the Retaining Ring for D30 Shaft [25] from the Cylinder [21] with a retaining ring
puller. Then the Second Gear [22], Spring (A) [23] and Washer (A) [24] can be removed from the Cylinder
[21].
(4) Disassembly of the cylinder and the second hammer
Remove the Stopper Ring [33] from the inside diameter portion of the Cylinder [21]. Then the Second
Hammer [26], O-ring (1AP-20) [27], Hammer Holder [28], O-ring (B) [29], Damper (A) [30], O-ring (C) [31]
and Damper Holder [32] can be removed from the Cylinder [21]. Remove the Stopper Ring [33] from the
groove of the inside diameter portion of the Cylinder [21] by tapping the Stopper Ring [33] through the 5-mm
diameter hole of the Cylinder [21] with a hammer and a punch as shown in Fig. 14. At reassembly, replace the
Stopper Ring [33] with new one as the removed Stopper Ring [33] is deformed. To prevent idle hammering,
also replace O-ring (C) [31] with new one at reassembly.
Grip [3]
Steel Ball D7.0 [20]
Holder Plate [5]
Grip [3]
Stopper Ring [2]
Ball Holder [4]
--- 26 ---
Holder Spring [6]
Retaining
Ring for D20
Shaft [8]
Washer (B) [7]
Fig. 13