Hitachi H 45SR Technical Data And Service Manual page 17

First gear and crank shaft disassembly
Remove the grease from the Connecting Rod [32] side and the First Gear [51] side of the Cylinder Crank
Case [46]. Remove the two Seal Lock Hex. Socket Flat Hd. Bolts M5 x 12 [42] fixing Bearing Cover (A) [43].
Then place the Connecting Rod [32] side of the Cylinder Crank Case [46] downward on a workbench and
apply pressure on the end surface of the Crank Shaft [40] with a hand press to remove the First Gear [51] and
the Crank Shaft [40] (Fig. 13). Before removing them, make sure that the two Seal Lock Hex. Socket Flat Hd.
Bolts M5 x 12 [42] fixing Bearing Cover (A) [43] are removed.
Cylinder crank case
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 the Ball Bearing 6203DDCMPS2L [44] in the Cylinder Crank Case [46] and fix Bearing Cover (A) [43]
with the two Seal Lock Hex. Socket Flat Hd. Bolts M5 x 12 [42]. Press-fit the Crank Shaft [40]. Then mount
the Oil Seal [45]. Put the Feather Key 4 x 4 x 10 [41] into the groove of the Crank Shaft [40] and press-fit the
First Gear [51] 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 4 x 4 x 10 [41] fits in the key groove of the First Gear [51]
(Fig. 14).
Cylinder crank case
Crank shaft
Fig. 13
Suitable tool
Fig. 14
--- 14 ---
Apply pressure on the end
surface of the crank shaft
with a hand press.
First gear
Bearing cover (A)
Workbench
Feather key
First gear
Oil seal
Ball bearing
Hex. socket hd. flat
bolt M5
Bearing cover (A)
Crank shaft
Steel bar