Hitachi H 65SD Technical Data And Service Manual page 17

9-1-2. Reassembly
Reassembly can be accomplished by following the disassembly procedures in reverse. However, special
attention should be given to the following items.
Reassembly of the Crank Shaft [48] section
Press-fit the 6205DDCM Ball Bearing [45] into the Inner Cover [43], and fasten the Bearing Cover [46] onto
the Inner Cover [43] with the four M5 x 16 Seal Lock Hex. Socket Hd. Bolts [47]. Support the inner race of the
6205DDCM Ball Bearing [45] with an appropriate jig, and press-fit the Crank Shaft [48] into the Ball Bearing.
Next, insert Distance Ring (B) [42] and two Woodruff Keys [64] into the Crank Shaft [48], and press-fit the
Final Gear [41] and 6302VVCM Ball Bearing [40] with a hand press.
Reassembly of the Armature Ass'y [74]
Press-fit the 6203DDCM Ball Bearing [71] into the Inner Cover [43], and fasten Bearing Cover (A) [70] onto
the Inner Cover with the three M5 x 16 Seal Lock Hex. Socket Hd. Bolts [47].
Reassembly of the Striker [22] (Two possible methods)
(1) After the Connecting Rod Ass'y [29] has been
assembled into the Housing Ass'y [50], mount the
Piston [28] and press it into the Striker [22].
Connecting Rod Ass'y [29]
Piston [28]
Respiratory holes
Either of the two methods described above requires a pressing force of more than 30 kg. When a "hissing"
sound is heard, the Piston is properly inserted in the Striker. (The "hissing" is the sound of the compressed air
escaping from the Striker when the Piston reaches the respiratory chambers within the Striker.)
Push
Striker [22]
(2) Mount the Piston [28] onto the Connecting
Rod Ass'y [29], and push down on the
Connecting Rod Ass'y to press the Piston into
the Striker [22].
Housing Ass'y [50]
Piston [28]
Respiratory holes
Fig. 17
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Push
Connecting Rod Ass'y [29]
Striker [22]