Hitachi H 60MA Repair Manual

1. REPAIR GUIDE
1-1. Precautions and Suggestions for Disassembly and Reassembly of the Main Body
The numbers in [Bold] and <bold> correspond to the item numbers in the Parts List and exploded
assembly diagrams. ([ ]: H 60MA and H 60MB, < >: H 60MB only)
1-1-1. Disassembly
• Piston and striker disassembly
Remove the Hex. Socket Hd. (W/Flange) Bolt M8 [30] fixing the Cylinder Case [29], and disassemble
the Cylinder Case [29] from the Crank Case [38]. As the Piston [35] remains in the Crank Case [38]
side, remove the Retaining Ring [37] to remove the Connecting Rod [36] from the Crank Shaft [43]. The
Striker [32] can be removed by tapping the Cylinder Case [29] lightly with a plastic hammer. If it does
not come out easily, push the disassembled Piston [35] with the Connecting Rod [36] back into the
Cylinder, and pull them apart again quickly. The Striker can come out at the same time.
• First gear and crank shaft disassembly
Remove the grease from the Connecting Rod [36] side and the First Gear [54] side of the Crank Case
[38]. Remove the two Seal Lock Hex. Socket Hd. Bolts M5 [45] fixing the Bearing Cover [46]. Then
place the Connecting Rod [36] side of the Crank Case [38] downward on a workbench and apply
pressure on the end surface of the Crank Shaft [43] with a hand press to remove the First Gear [54] and
the Crank Shaft [43] (Fig. 1). Before removing them, make sure that the two Seal Lock Hex. Socket Hd.
Bolts M5 [45] fixing the Bearing Cover [46] are removed.
Crank case
Bearing cover
• Retainer disassembly (See Figs. 2 and 3.)
Pull Grip (A) [2] fully in the arrow direction as
shown in Fig. 2 and remove the Front Cap [1]
(since the Front Cap [1] is made of rubber and
engaged firmly with Grip (A), pull it strongly to
remove). This allows Grip (A) [2] to be
separated from the Retainer Sleeve [19].
MODEL
Crank shaft
H 60MA, H 60MB
Apply pressure on the end
surface of the crank shaft
with a hand press.
Fig. 1
Front cap
--- 1 ---
First gear
Workbench
Grip (A)
Fig. 2