Reference Information; Sealed And Dustproof Construction; Vibration-Absorbing Construction - Hitachi H 65SD 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 five (5) O-rings and a seal ring. These
seals serve to prevent leakage of the grease, as well as to prevent dust and dirt from the entering the mechanism.
O-ring (64.4 mm inner dia.)

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 (44.4 mm inner dia.)
O-ring
(23.7 mm inner dia.)
Cylinder case
O-ring
(59.6 mm inner dia.)
Oil cap
O-ring
(37.5 mm inner dia.)
Housing
Fig. 7
Vibration-absorbing rubber
Plate (A)
(connected with the
hammer main body)
--- 10 ---
Switch handle
Gear cover
Seal ring
Handle rubber
Oil cap
Handle rubber
Plate (B)
(connected with
the handle)
Vibration works in the shearing
direction of the rubber.
Fig. 8