Hitachi H 25PV Technical Data And Service Manual page 18

9-1-2. Reassembly
Reassembly can be accomplished by following the disassembly procedure in reverse. However, special attention
should be given to the following items.
First gear and crank shaft reassembly
Press-fit Oil Seal (B) [48] in the Crank Case [46] then the O-ring (S-32) [49] is fitted in the groove inside the
Crank Case [46]. Press-fit the Ball Bearing 6002DDCMPS2L [50] in the Crank Case [46] then the Retaining
Ring for D32 hole [51] is fitted in the groove inside the Crank Case [46]. Press-fit the Crank Shaft [40] in the
Ball Bearing 6002DDCMPS2L [50]. Put the Feather Key 3 x 3 x 8 [39] into the groove of the Crank Shaft [40]
and press-fit the First Gear [52] with a suitable tool while holding the flat portion of the Crank Shaft [40] with a
steel bar. Before press-fitting, make sure that the Feather Key 3 x 3 x 8 [39] fits in the key groove of the First
Gear [52] (Fig. 20).
Piston reassembly
Mount the O-ring [35] to the Piston [37]. Insert the Piston Pin [36] into the Piston [37] and the Connecting
Rod [38]. Move the Crank Shaft [40] to the bottom dead center then insert the piston ass'y into the Crank
Case [46] from Cylinder Case [9] side (Figs. 21 and 22).
Crank shaft
Fig. 21
Suitable tool
Crank shaft
Crank case
Fig. 20
Crank case
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First gear
Feather key
Retaining Ring for D32 hole
O-ring
Ball bearing
Oil seal (B)
Steel bar
Crank shaft
Piston
Fig. 22
Crank case