What should be checked periodically by a mechanic on a fire apparatus?

The key aspect of maintaining a fire apparatus includes ensuring that all fluids are at proper levels and in good condition, as they contribute to the overall functionality and safety of the vehicle. Checking differential fluid specifically is critical because it lubricates the gears within the differential, ensuring smooth operation and preventing overheating or wear.

While brake fluid, oil levels, and transmission fluid are all important for the apparatus's performance, differential fluid is often overlooked. It serves a unique purpose, primarily affecting the vehicle's ability to transfer power efficiently to the wheels, especially in critical scenarios such as responding to emergencies where optimum traction and maneuverability are required. Mechanics often emphasize checking differential fluid during regular maintenance schedules, alongside other fluids, to ensure full operational capability of the fire apparatus.