Hitachi DH 24DVA Technical Data And Service Manual page 33

(3) Disassembly of the tool retainer
Slide the Grip [3] fully in the arrow direction as shown in Fig. 17 and remove the Front Cap [1]. Pulling the
Grip [3] as shown in Fig. 18, remove the Stopper Ring [2] with a retaining ring puller. Then the Grip [3], Ball
Holder [4], Steel Ball D7.0 [16], Holder Plate [5], Holder Spring [6] and Washer (B) [7] can be removed from
the Cylinder [17].
Front Cap [1]
Fig. 17
(4) Removal of the cylinder and the second gear (slip mechanism section)
Remove Gear Cover (A) [10] from the Inner Cover Ass'y [42] and remove the entire tool retainer. Remove the
Retaining Ring for D20 Shaft [8] with a retaining ring puller. Stand Gear Cover (A) [10] in this state and pull
out the Cylinder [17] from Gear Cover (A) [10] with a hand press. Then the Sleeve [12] can be removed from
the Cylinder [17]. Remove the Retaining Ring D30 [28] from the Cylinder [17] with a retaining ring puller.
Then the Second Gear [25], Spring (A) [26] and Washer (A) [27] can be removed from the Cylinder [17].
(5) Removal of the cylinder and the second hammer
Remove the Stopper Ring [36] from the inside diameter portion of the Cylinder [17]. Then the Second
Hammer [29], O-ring (1AP-20) [30], Hammer Holder [31], O-ring (B) [32], Damper (A) [33], O-ring (C) [34]
and Damper Holder [35] can be removed from the Cylinder [17]. As shown in Fig. 19, insert the no-hole side
of stopper ring jig (A) (J-341) into the Cylinder [17] until it contacts the end surface of the Damper Holder [35].
Hold the Cylinder [17] and the end surface of stopper ring jig (A) (J-341) with a vise, and compress Damper
(A) [33] (it moves a little when the Stopper Ring [36] is pressed with punch (C) (J-341)). Insert punch (C)
(J-341) into the 5-mm diameter holes (2 places) in the Cylinder [17] and tap the outside of the Stopper Ring
[36] until the Stopper Ring [36] cannot be seen from the 5-mm diameter holes (2 places) to remove the
Stopeer Ring [36] from the groove of the inside diameter portion of the Cylinder [17]. Then remove the
Cylinder [17] from the vise and pull out the Stopper Ring [36] from the inside diameter portion of the Cylinder
[17] with ring puller jig (B) (J-341) being careful not to pop out the Stopper Ring [36]. At reassembly, replace
the Stopper Ring [36] with new one as the removed Stopper Ring [36] is deformed. To prevent idle
hammering, also replace O-ring (C) [34] with new one at reassembly.
Grip [3]
Steel Ball D7.0 [16]
Holder Plate [5]
Grip [3]
Stopper Ring [2]
Ball Holder [4]
--- 30 ---
Holder Spring [6]
Retaining
Ring for D20
Shaft [8]
Washer (B) [7]
Fig. 18