What should be inspected for proper air pressure in a pre-start check?

Proper air pressure in the tires is crucial for the safe and efficient operation of a forklift. When conducting a pre-start check, ensuring that the tires have the correct air pressure helps maintain stability and control during operation. Under-inflated tires can result in poor handling, increased tire wear, and a higher risk of accidents. Conversely, over-inflated tires can cause a harsh ride and potential blowouts.

In the context of this question, focusing on tire air pressure is essential because it directly impacts the forklift's performance, safety, and overall operational efficiency. Other components such as the hydraulic system, battery fluids, and load guard serve different functions that are vital for the forklift's functionality, but they do not involve air pressure.