Hitachi H 90SE Technical Data And Service Manual page 15

(2) Level of handle vibration in 'Z' direction
The graph below illustrates the relationship between handle pressing force and handle vibration level in the
'Z' direction.
130
125
120
115
110
0 5
Pressing force (load) (kgf)
(Note) For improved operability in chipping and breaking operations, it is recommended that operating force be
limited to the dead weight of the tool rather than pressing forcefully down on the handles. In keeping
with this, the handle pressing force at which the vibration-absorbing effect is maximum is set for
between 5 and 10 kg. The customer should be cautioned to avoid pressing fully down on the handles
during operation.
Vibration level of handles in Z direction
10 15 20
--- 13 ---
Vibration level of main body in Z direction
Z
Z
Z