What effect does the steering control valve have in case of engine or hydraulic failure?

In the event of an engine or hydraulic failure, the steering control valve plays a critical role in maintaining some level of operational control. When the hydraulic system is compromised, the steering control valve can function as a manual pump. This allows the operator to still maneuver the crane, albeit with increased difficulty and effort, as the hydraulic assistance is no longer available. The manual operation allows for limited steering capabilities, making it possible to guide the crane to a safe location or to perform an emergency stop.

This functionality is essential for safety, as it provides the operator with the ability to respond to critical situations when hydraulic power is lost. The ability to manually steer can help prevent accidents and allow for safer operation until proper repairs can be made.