Reference Information; Sealed And Dustproof Construction; Vibration-Absorbing Construction - Hitachi H 65SD2 Technical Data And Service Manual

8. REFERENCE INFORMATION

8-1. Sealed and Dustproof Construction

The cylinder case section and housing (crank case side) are sealed by six (6) O-rings and a seal ring. These
seals serve to prevent leakage of the grease, as well as to prevent dust and dirt from entering the mechanism.
O-ring (Inner diameter 44.4 mm)
O-ring
(Inner diameter 64.4 mm )

8-2. Vibration-Absorbing Construction

There are vibration-absorbing cushions (handle rubbers) provided between the switch handle and the crank case
and motor housing which allow significantly less vibration to transfer from the tool to the arm of the operator than
conventional type hammers.
Vibration-absorbing rubber
As shown in Fig. 8, the main unit and handle are coupled only by the vibration-absorbing rubber. As vibration is
absorbed by the shearing type vibration-absorbing construction, the vibration-absorbing effect is high.
O-ring x 2
(Inner diameter
26.5 mm )
Cylinder case
O-ring
(Inner diameter 37.5 mm)
Vibration-absorbing rubber
Plate (A)
(connected with the
hammer main body)
O-ring (Inner diameter 59.6 mm )
Seal ring
Oil cap
Housing
Fig. 7
Handle rubber
Plate (B)
(connected with
the handle)
Vibration works in the shearing
direction of the rubber.
Fig. 8
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Switch handle
Gear cover
Handle rubber