Hitachi DH 40MRY Technical Data And Service Manual page 22

Retainer Sleeve [17]
Second Hammer [20]
(3) Disassembly of the first gear and the crank shaft
Remove grease from the Connecting Rod [35] side
and the First Gear [61] side of the Cylinder Crank
Case [46]. Remove the Retaining Ring for D40 Hole
[42] from the Ball Bearing 6203DDCMPS2L [43]
using a retaining ring puller. At this time, shift the
position of the crank pin of the Crank Shaft [41] as
shown in Fig. 18 so that the hole of the retaining
ring can be seen before removal. Face the
Connecting Rod [35] side of the Cylinder Crank
Case [46] downward and place it on a support.
Press the end surface of the Crank Shaft [41] with a
hand press to remove the First Gear [61] and the
Crank Shaft [41] (Fig. 19).
Cylinder Crank Case [46]
Lock Sleeve [29]
Striker [24]
Cylinder Crank Case [46]
Cylinder [26]
Clutch [31]
Bevel Pinion [48]
Fig. 17
Crank Shaft [41]
Fig. 19
--- 19 ---
Bevel Gear [32]
Piston [34]
Connecting Rod [35]
Crank Shaft [41]
Cylinder Crank
Case [46]
Hole of Retaining
Ring for D40 Hole
[42]
Crank Shaft [41]
Fig. 18
Press the end of the
Crank Shaft [41] with
a hand press.
First Gear [61]
Support