COMPONENT OPERATION / Pump Device
T3-1-20
STEERING MAIN RELIEF VALVE
The main pump has a built-in steering main relief valve.
When the steering circuit pressure exceeds the set
pressure, pressure oil is returned to the hydarulic oil
tank through the main pump casing.
Operation
When the steering circuit pressure exceeds the set
pressure, the poppet is pushed toward the spring and
pressure oil is returned to the hydraulic oil tank
through the main pump casing.
NOTE: When the steering relief valve is operated,
the spool of the priority valve moves toward
port LS and the majority pressure oil from
the main pump flows to the control valve
through port EF. (Refer to T3-1-18.)
Before Operation
T4GB-03-01-020
During Operation
T4GB-03-01-021
Steering Circuit Pressure
Below Set Pressure
To Main Pump
Casing
Steering Circuit Pressure
Beyond Set Pressure
Summary of Contents for ZW180
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Page 10: ...GENERAL Specification T1 1 2 Blank ...
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Page 116: ...SYSTEM ECM System T2 2 10 Blank ...
Page 128: ...SYSTEM Hydraulic System T2 3 12 Blank ...
Page 147: ...SYSTEM Hydraulic System T2 3 31 Blank ...
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Page 212: ...COMPONENT OPERATION Control Valve T3 2 4 T4GB 03 02 003 1 2 3 4 5 7 8 9 10 11 7 6 ...
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Page 232: ...COMPONENT OPERATION Control Valve T3 2 24 Blank ...
Page 248: ...COMPONENT OPERATION Steering Pilot Valve T3 4 6 Blank ...
Page 258: ...COMPONENT OPERATION Steering Valve T3 5 10 Blank ...
Page 274: ...COMPONENT OPERATION Pilot Valve T3 6 16 Blank ...
Page 282: ...COMPONENT OPERATION Pilot Valve T3 6 24 Blank ...
Page 299: ...COMPONENT OPERATION Ride Control Valve T3 8 5 Blank ...
Page 306: ...COMPONENT OPERATION Ride Control Valve T3 8 12 Blank ...
Page 348: ...COMPONENT OPERATION Drive Unit T3 9 42 Blank ...
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