Hitachi DH 24PM Technical And Service Manual page 35

(7) Mounting the bit holder or the chuck holder
The bit holder or the chuck holder can be mounted by the disassembly procedure in reverse. How to mount
the Lock Grip [11] is as follows. Mount the Spring [10] and the Lock Ring [12] to the Lock Grip [11] and align
the Spring [10] with the notch of the Bit Holder [13]. At this time, place the Bit Holder [13] on a suitably-sized
support for easy mounting. Mount Washer (B) [9]. Push in the Lock Grip [11] turning in the arrow direction on
the Lock Grip [11] as shown in Fig. 29 and fix it with the Retaining Ring for D25 Shaft [8]. If it is impossible to
mount Washer (B) [9] to the fixing position of the Retaining Ring for D25 Shaft [8], remove Washer (B) [9] and
check that the Sping [10] is inserted to the proper position. (Fig. 19)
Notch
Spring [10]
(8) Mounting the piston
Mount the Piston [53] as shown in Fig. 30.
Lock Grip [11]
Bit Holder [13] or
Chuck Holder [29]
Fig. 28
Inner Cover Ass'y [56]
First Gear [66]
Lock Ring [12]
Striker [51]
Reciprocating Bearing [65]
Fig. 30
--- 32 ---
Spring [10]
Lock Grip [11]
Support
Fig. 29
Piston [53]
Second Shaft [63]