What is the typical gear ratio when transferring power from the rear axle to a fire pump?

The typical gear ratio when transferring power from the rear axle to a fire pump is 1:1. This means that for every rotation of the rear axle, there is a corresponding rotation of the pump shaft, enabling direct power transfer without mechanical advantage or disadvantage. This configuration is desirable in firefighting applications because it ensures that the pump operates at the same engine speed, providing consistent performance and reliability. A 1:1 ratio allows for smooth and immediate engagement of the pump's necessary horsepower, ensuring that firefighters can access water pressure effectively when needed. In firefighting scenarios, precise timing and efficiency in power delivery can be critical, which is why this ratio is preferred.