COMPONENT OPERATION / Steering Pilot Valve
T3-4-4
Left Steering
1. When the steering wheel is turned to the left,
spool (4) rotates. Pressure oil from the brake/pilot
pump flows in the order of port P - sleeve (3) -
spool (4) - sleeve (3) - housing (1) - gerotor (8).
2. Pressure oil from gerotor (8) flows in the order of
housing (1) - sleeve (3) - spool (4) - sleeve (3) -
port L – the steering valve, and controls the
steering valve.
3. The steering valve operates the steering cylinder
by pressure oil from the main pump, and directs
the vehicle body toward left.
4. Returning oil from the steering valve flows to port
R, flows in the order of housing (1) - sleeve (3) -
spool (4) - sleeve (3) - port T and returns to the
hydraulic oil tank.
5. When pressure oil from the brake/pilot pump flows
to gerotor (8), gerotor (8) rotates to the left.
Rotation of gerotor (8) is transmitted to sleeve (3)
via drive (7), and sleeve (3) rotates to the left.
6. When sleeve (3) rotates by the same amount of
spool (4), the passage between sleeve (3) and
spool (4) is closed and operation of the steering
valve is stopped.
7. Therefore, gerotor (8) rotates in response to
rotation of the steering wheel, and the steering
valve is operated in response to the amount of
turns of the steering wheel.
T4GB-03-04-009
Steering Cylinder
Steering Valve
Main Pump
Port R
Port T
Port L
Port P
Brake/Pilot
Pump
8
1
7
4
2
3
Steering Pilot Valve
Summary of Contents for ZW180
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Page 8: ...4GDT 1 2 Blank ...
Page 10: ...GENERAL Specification T1 1 2 Blank ...
Page 38: ...GENERAL Component Specifications T1 3 14 Blank ...
Page 39: ...MEMO ...
Page 40: ...MEMO ...
Page 42: ...4GDT 2 2 Blank ...
Page 56: ...SYSTEM Control System T2 1 14 Blank ...
Page 82: ...SYSTEM Control System T2 1 40 Blank ...
Page 92: ...SYSTEM Control System T2 1 50 Blank ...
Page 106: ...SYSTEM Control System T2 1 64 Blank ...
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 ...
Page 150: ...SYSTEM Hydraulic System T2 3 34 Blank ...
Page 184: ...SYSTEM Electric System T2 4 34 Blank ...
Page 185: ...MEMO ...
Page 186: ...MEMO ...
Page 195: ...COMPONENT OPERATION Pump Device T3 1 7 Blank ...
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 ...
Page 214: ...COMPONENT OPERATION Control Valve T3 2 6 T4GB 03 02 003 1 2 3 4 5 7 8 9 10 11 7 6 ...
Page 226: ...COMPONENT OPERATION Control Valve T3 2 18 Blank ...
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 ...
Page 371: ...MEMO ...
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