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SECONDARY RELIEF PRESSURE ADJUSTMENT
When attaching the breaker other than the NPK, it is necessary
to install the secondary relief valve in line. For this purpose,
the boom piping for the attachment is provided with a part to
which the secondary relief valve is connected.
Pressure is set to A when shipped from HITACHI.
Model
ZX120-3, 180-3, 200-3 class
ZX250LC-3, 250LCN-3
ZX280LC-3, 280LCN-3
ZX330-3 class
After completing piping, reset this pressure to the specified
level of each breaker.
Adjust the pressure as follows :
1. Attach the pressure gauge to the pressure gauge port.
2. Loosen the lock nut, then gradually turn the pressure-
adjust screw clockwise to increase the pressure, or coun-
terclockwise to reduce the pressure.
One turn of the screw changes about 4.9 MPa (50 kgf/
2
cm
) in pressure.
3. After adjusting the pressure, make sure to tighten the
lock nut.
OPERATING THE MACHINE
Set Pressure A
2
17.6 MPa (180 kgf/cm
)
2
19.6 MPa (200 kgf/cm
)
5-18
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