Hitachi DH 40MRY Technical Data And Service Manual page 25

Damper Washer [21]
Second Hammer [20]
Retainer Sleeve [17]
Retaining Ring D35 [13]
Ball Bearing
6007DDUAV2S [14]
Bearing Washer [15]
Damper Holder [23]
(4) Mounting the fan guide
Mount the Fan Guide [79] to the Housing Ass'y
[123] paying attention to the direction of the
0.05 convex line.
Needle Pin D6 x 6 [18]
Lock Spring [27]
Striker [24]
Damper
[22]
Spring Holder (B) [28]
Lock Sleeve [29]
Clutch [31]
Clutch Spring [30]
Fig. 23
0.05 convex line
Fan Guide [79]
Housing Ass'y [123]
--- 22 ---
Bevel Gear [32]
Cylinder [26]
Cylinder Crank Case [46]
Fig. 24