Hitachi H 60MEY Service Manual page 8

Reassembly can be conducted by reversing the disassembly procedure. However, special attention should
be given to the following items.
1. Reassembly of the hammering mechanism and low vibration mechanism
(1) Mounting the first gear and crank shaft
(a) Press-fit Oil Seal [123]{113} to the Crank
Case [121]{111}. Mount O-ring (F) <110>.
Press-fit the Ball Bearing 6204DD <109>.
Use a retaining ring puller to mount the
Retaining Ring for D47 Hole <108>.
Press-fit the Crank Shaft <106> to the Ball
Bearing 6204DD <109>.
(b) Insert the Feather Key <107> into the
Crank Shaft <106> groove. Support the
plane of the Crank Shaft <106> with an
adequate steel rod and use an adequate
tool to press-fit the First Gear [124]{114}.
NOTE: Prior to press-fitting, make sure
the Feather Key <107> matches
the key groove of the First Gear
[124]{114}.
(2) Mounting the piston
(a) Insert the Connecting Rod <54> into the Piston <53> and then press-fit the Piston Pin <52> into the
D10 hole (marked "Φ2") of the Piston <53>. Then mount the O-ring <51> on the Piston <53> to
complete the piston ass'y.
NOTE: Be careful not to let the Piston Pin <48> project from the outer diameter of the Piston
<53>.
(b) Next, turn the Crank Shaft <106> to the position shown below, and then mount the piston ass'y to
the Crank Shaft <106> from the Cylinder Case <24> side of the Crank Case [121]{111}. Use a
retaining ring puller to fix the Retaining Ring for D12 Shaft <105>.
<52>
<51>
Reassembly
Marked with "Φ2"
<54>
<53>
<106>
<107>
<110>
[124]{114}
Adequate steel rod
-7-
Adequate tool
[121]{111}
<109>
[123]{123}
<105>
<106>