Hitachi DH 40FR Technical Data And Service Manual page 18

Cylinder Washer [18]
Second Hammer [10]
Damper [12]
Damper Washer [11]
(4) Disassembly of the first gear and the crank shaft
Remove grease from the Connecting Rod [25] side and
the First Gear [55] side of the Cylinder Crank Case [40].
Remove the Retaining Ring for D40 Hole [36] from the
Ball Bearing 6203DDCMPS2L [37] using a retaining ring
puller. At this time, shift the position of the crank pin of
the Crank Shaft [34] as shown in Fig.10 so that the hole
of the retaining ring can be seen before removal. Face
the Connecting Rod [25] side of the Cylinder Crank Case
[40] downward and place it on a support. Press the end
surface of the Crank Shaft [34] with a hand press to
remove the First Gear [55] and the Crank Shaft [34] (Fig.
11).
Cylinder Crank Case [40]
Clutch Spring [19]
Striker [20]
Cylinder Crank Case [40]
Fig. 9
Crank Shaft [34]
Fig. 11
--- 15 ---
Clutch [22]
Cylinder [17]
Bevel Gear [26]
Piston [23]
Bevel Pinion [41]
Connecting Rod [25]
Crank Shaft [34]
Cylinder
Crank Case
[40]
Hole of
Retaining Ring
for D40 Hole
[36]
Crank Shaft [34]
Fig. 10
Press the end surface
of the Crank Shaft [34]
with a hand press.
First Gear [55]
Support