👉 The lead fluid, also known as the primary fluid or base fluid in certain hydraulic systems, is the main liquid component that flows through hydraulic circuits to transmit power and control mechanical actions. It's typically a high-performance fluid with excellent lubricating, cooling, and wear-resistant properties, designed to maintain system efficiency and longevity. The lead fluid's viscosity and chemical stability are crucial for optimal hydraulic performance, ensuring smooth operation and minimizing energy loss.