In a dual station hydraulic steering system, the fill location should be:

In a dual station hydraulic steering system, the fill location should be at the upper station because this position allows for more effective bleeding of air from the system and ensures that the fluid can adequately circulate throughout the entire system. When filled at the upper station, gravity can assist in keeping the fluid level consistent and reduces the chances of air pockets forming in the hydraulic lines, which can impair steering performance and responsiveness.

Filling the system at this point ensures that any air trapped in the lines can rise and escape, enhancing the reliability and efficacy of the steering system. This practice aligns with best practices outlined in hydraulic steering system guidelines, which underscore the importance of optimal fluid dynamics for seamless operation.