Reference Information; Sealed And Dust-Proof Structure; Vibration-Proof Structure; Stop Lever [Tool Retainer] - Hitachi H 65SB2 Technical Data And Service Manual

8. REFERENCE INFORMATION

8-1. Sealed and Dust-proof Structure (See Fig. 1.)
The cylinder case section and the housing (crank case side) are sealed by six (6) O-rings, a holder seal, 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-proof Structure:

There are anti-vibration cushions (handle rubbers) provided between the switch handle and the crank case and
the motor housing which allow significantly less vibration to transfer from the tool to the arm of the operator than
convetional type hammers.
Anti-vibration rubber
As shown in Fig. 2, the main unit and the handle
are coupled only by the anti-vibration rubber.
As vibration is absorbed by the shearing type
anti-vibration construction, the anti-vibration
effect is high.
8-3. Stop Lever [Tool Retainer] (See Fig. 3.)
To attach and detach the tool (bull point etc.)
as shown in Fig. 3, pull the stop lever in the
direction of arrow, and turn it 180û. Then, fully
insert the tool into the hexagonal hole of the
front cover.
O-ring x 2
(Inner diameter
23.7 mm)
Cylinder case
O-ring
(Inner diameter 59.6 mm)
Seal ring
Oil cap
Housing
O-ring
(Inner diameter 37.5 mm)
Fig. 1
Anti-vibration rubber
Plate (A)
(Connected with the
hammer main body)
Hold the tool with its
flattened part directed
upward.
Tool shank
--- 8 ---
Switch handle
Gear cover
Handle rubber
Handle rubber
Plate (B)
(Connected with
the handle)
Vibration works in the shearing
direction of the rubber.
Fig. 2
Front cover
Stop lever
Fig. 3