Reference Information; Sealed And Dustproof Construction; Vibration-Absorbing Construction - Hitachi H 70SA Technical Data And Service Manual

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8. REFERENCE INFORMATION

The cylinder case section and housing (crank case side) are sealed by four (4) 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

(64.4 mm (2-17/32") inner dia.)

(1) Vibration-absorbing construction

The handle holders which secure handle (B) and the side handle to the housing can be smoothly turned

thanks to the handle pins inserted in the slotted through holes at both sides of the housing. The handle pins

are supported by dampers (B) fitted into the slotted through holes so that they can be moved in the axial

direction of the tool. Two blocks of rubber (handle dampers (B)) are inserted between the housing and the

handle holder. By pressing the handle portion, the handle holder turns and handle damper (B) is compressed

and sheared according to the movement of the main body. Damper (B) is also compressed when it comes in

contact with the handle pin. Thus, vibration transmitted from the main body to the handle portion is minimized.

The four cylindrical rubbers (handle dampers) cushion the shock generated between the housing and the

handle holder when the handle holder returns to the original position. The T-shaped handle with shock

absorber improves downward chipping and demolishing performance and reduces operator's fatigue for a

long-time operation.

O-ring (44.4 mm (1-3/4") inner dia.)

O-ring

(23.7 mm (15/16") inner dia.)

Cylinder case

O-ring

(59.6 mm (2-11/32") inner dia.)

Holder seal

Fig. 3

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Gear cover

Seal ring

Housing

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