OPERATING THE MACHINE
5-18
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
Set Pressure A
ZX120-3, 180-3, 200-3 class
ZX250LC-3, 250LCN-3
17.6 MPa (180 kgf/cm
2
)
ZX280LC-3, 280LCN-3
ZX330-3 class
19.6 MPa (200 kgf/cm
2
)
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/
cm
2
) in pressure.
3. After adjusting the pressure, make sure to tighten the
lock nut.
Summary of Contents for ZAXIS 120-3 class
Page 1: ......
Page 3: ......
Page 5: ......
Page 49: ...SAFETY SIGNS Europe Asia Middle and Near East Model Only S 38 MEMO ...
Page 131: ...BREAK IN 2 MEMO ...
Page 191: ...TRANSPORTING 6 MEMO ...
Page 290: ...HYDRAULIC CIRCUIT AND ELECTRICAL CIRCUIT 8 HYDRAULIC CIRCUIT M1V1 08 001 ...
Page 292: ...8 ELECTRICAL DIAGRAM ...
Page 293: ...HYDRAULIC CIRCUIT AND ELECTRICAL CIRCUIT 8 MEMO ...
Page 295: ...MAINTENANCE UNDER SPECIAL ENVIRONMENTAL CONDITIONS 9 MEMO ...
Page 351: ...SPECIFICATIONS 12 42 MEMO ...
Page 455: ...OPTIONAL ATTACHMENTS AND DEVICES 13 104 MEMO ...
Page 461: ...INDEX 14 MEMO ...