🔍 Key Concepts

• Redundancy in steering gear systems – how main and standby pumps are arranged and selected • Difference between automatic changeover (electrical or solenoid‑operated) and manual changeover (hand‑operated valves or levers) • How a six‑way valve is typically used in steering gear hydraulics to route flow from one pump to another cylinder or circuit

💭 Think About

• Look at the illustration and trace the discharge line of each main pump: what single component do both pump outlets pass through before reaching the rest of the system? • Which labeled items appear to be solenoid‑operated or electrically controlled, and which appear to have a hand lever or mechanical operator? • If one main pump fails and you want the other pump to take over the same hydraulic circuit, what must physically be done to reroute the oil flow?

✅ Before You Answer

• Identify which symbol in the drawing actually represents the six‑way valve and verify whether it is shown with a manual operating handle or with solenoids. • Confirm whether items A and C are pressure‑control or directional valves that change state automatically (e.g., via solenoids or pilot pressure) rather than by manual operation. • Make sure the component you choose is the one that directly selects which pump feeds the steering cylinders, not just something that starts/stops the electric motor.