Hitachi DH 14DL Technical Data And Service Manual page 30

8. Mounting the piston
Mount the Piston [29] as shown in the figure below. At this time, mount the Thrust Plate [27] aligning the
change lever pocket of the Inner Cover Ass'y [33] with the notch of the Thrust Plate [27].
Mounting the piston
Washer (B) D12.5 [41]
Mounting direction of the thrust plate
Spring (B) [28]
Inner Cover Ass'y [33]
First Gear [40]
Notch
Thrust Plate [27]
Thrust Plate [27]
Piston [29]
O-ring (A) [25]
Striker [24]
Second Shaft [36]
Clutch [37]
Needle Cage [39]
Reciprocating Bearing [38]
Change lever pocket
Inner Cover Ass'y [33]
27
Spacer [35]