Shock-Absorbing Mechanism; Sealed And Dustproof Construction - Hitachi H 45MRY Technical Data And Service Manual

8-5. Shock-absorbing Mechanism

At the instance of releasing the bull point from the concrete by moving the main body up, the second hammer
contacts hammer holder (A) as shown in Fig. 7 then the cushion (damper (A)) provided between hammer holder
(A) and the front cover absorbs the striking force of the second hammer. Thus the durability of the Model
H 45MRY is greatly increased because the second hammer does not strike the tool retainer directly.

8-6. Sealed and Dustproof Construction

The cylinder crank case is sealed by five O-rings and an oil seal which serve to prevent leakage of the grease, as
well as to prevent dust and dirt from entering the mechanism (Fig. 8).
Front cover
Retainer sleeve
Second hammer
Hammer holder (A)
O-ring
Cylinder crank case
O-ring
O-ring
O-ring
Housing
Damper (A)
Fig. 7
O-ring
Vibration absorbing unit
Vibration absorbing unit
Fig. 8
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Switch handle
Oil seal