Hitachi ZW180, Technical Manual

Page: 32 / 374

GENERAL / Component Specifications
T1-3-8
RIDE CONTROL VALVE (OPTIONAL)
Type.......................................................... Pilot Pressure Operated Type
Overload Relief Set Pressure................... 39.2 MPa (400 kgf/cm
2
) @ 50 L/min (13 US gpm)
Charge Cut Pressure................................ 11.3 MPa (115 kgf/cm
2
)
RIDE CONTROL ACCUMULATOR (OPTIONAL)
Capacity.................................................... 4 L (244 in
3
)
Charging Pressure ................................... 2.9 MPa (30 kgf/cm
2
)
CHARGING BLOCK
Charging Pressure ................................... Cut In Pressure: 11.8 MPa (120 kgf/cm
2
)
Cut Out Pressure: 14.7 MPa (150 kgf/cm
2
)
Pilot Relief Valve Set Pressure................. 3.7 MPa (38 kgf/cm
2
) @ 40 L/min (10.6 US gpm)
SOLENOID VALVE (For Charging Block)
Function....................................................
•
Main Pump Torque Control
•
Parking Brake
SERVICE BRAKE ACCUMULATOR
Capacity.................................................... 1.4 L (85.4 in
3
)
Charging Pressure ................................... 4.4 MPa (45 kgf/cm
2
)
PILOT ACCUMULATOR
Capacity.................................................... 0.75 L (45.8 in
3
)
Charging Pressure ................................... 2.0 MPa (20 kgf/cm
2
)
PILOT SHUT OFF VALVE
Type.......................................................... Rotary Type
STEERING VALVE
Type.......................................................... Flow Amp Type
Over Load Relief Set Pressure ................ 32.3 MPa (330 kgf/cm
2
) @50 L/min (13 US gpm)