Hitachi ZW180 Technical Manual page 187

COMPONENT OPERATION
Group 1 Pump Device
Outline .....................................................T3-1-1
Main Pump ...............................................T3-1-2
Regulator .................................................T3-1-4
Priority Valve ..........................................T3-1-18
Pilot Pump..............................................T3-1-19
Pump Delivery Pressure Sensor .............T3-1-19
Steering Main Relief Valve......................T3-1-20
Group 2 Control Valve
Outline .....................................................T3-2-1
Hydraulic Circuit .......................................T3-2-8
Main Relief Valve....................................T3-2-12
Overload Relief Valve .............................T3-2-14
Restriction Valve ....................................T3-2-19
Negative Control Valve ...........................T3-2-20
Flow Rate Control Valve .........................T3-2-22
Group 3 Hydraulic Fan Motor
Outline .....................................................T3-3-1
Operation .................................................T3-3-4
Flow Rate Control Valve ...........................T3-3-6
Reverse Rotation Control Valve ................T3-3-8
Fun Pump ..............................................T3-3-10
Group 4 Steering Pilot Valve
Outline .....................................................T3-4-1
Construction .............................................T3-4-2
Operation .................................................T3-4-3
CONTENTS
Group 5 Steering Valve
Outline .....................................................T3-5-1
Operation .................................................T3-5-4
Steering Overload Relief Valve .................T3-5-8
Group 6 Pilot Valve
Outline (Standard Lever Type Pilot Valve for
Front Attachment) .................................T3-6-1
Operation .................................................T3-6-2
Electromagnetic Detent ............................T3-6-6
Outline (Joystick Type Pilot Valve for
Front Attachment) .................................T3-6-7
Operation .................................................T3-6-8
Electromagnetic Detent ..........................T3-6-12
Outline (Two-Derectional Lever Type Pilot Valve
for Additional Circuit) (Optional) ..........T3-6-13
Operation ...............................................T3-6-14
Outline (Joystick Type Pilot Valve for
Additional Circuit) (Optional)...................T3-6-17
Operation ...............................................T3-6-18
4GDT-3-1
SECTION 3