Hitachi H90SE, Технические данные и руководство по обслуживанию

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8. REFERENCE INFORMATION
8-1. Air Damper
There is an air chamber constructed between the second hammer and the hammer holder. The compression of
the air within the air chamber functions in the same way as a spring to maintain continuous and close contact
between the second hammer and the accessory tool mounted in the retainer. Because of this continuous close
contact between the second hammer and the accessory tool, digging and cutting work in asphalt, gravel and other
such comparatively soft materials can be accomplished with ease and efficiency.
Fig. 5
8-2. Sealed and Dustproof Construction
The cylinder case section and the housing (crank shaft side) are sealed by six (6) O-rings, and the bearing portion
of the crank shaft is sealed by an oil seal. These seals serve to prevent leakage of the grease, as well as to
prevent dust and dirt from entering the mechanism.
Accessory tool
O-ring
O-ring (A)
Piston
Striker
Second hammer
Hammer holder
Air chamber
Fig. 6
Switch handle
Oil seal
O-ring
(33.5 mm inner dia.)
O-ring
(79.5 mm inner dia.)
Housing
O-ring (A)
(36 mm inner dia.)
O-ring
(89.5 mm inner dia.)
O-ring (D)
(77.4 mm inner dia.)
Cylinder case Crank shaft
O-ring
(111.5 mm inner dia.)
Bearing portion of crank shaft