Which oil is recommended for the gearbox of a 20-ton sewage plant crane?

The recommended oil for the gearbox of a 20-ton sewage plant crane is SAE 120. This oil is suitable for such applications due to its viscosity and lubricating properties, which are essential for the efficient and smooth operation of heavy machinery like cranes.

SAE 120 provides a good balance between operating at various temperatures while ensuring proper lubrication under substantial loads. It helps reduce wear and tear on the gearbox components, supports good performance in both high and low-temperature environments, and maintains stability over time, which is crucial in a sewage treatment setting where machinery operates under challenging conditions.

Using oil with higher viscosity, like SAE 160 or SAE 200, might lead to difficulties in starting the machinery and could result in increased energy consumption. Conversely, oils with lower viscosity, such as SAE 80, may not provide adequate protection under heavy loads, risking equipment damage. Thus, SAE 120 is the optimal choice for ensuring the longevity and reliability of the crane's gearbox in a sewage treatment plant.