Final answer:
In a tractor with an automatic transmission, it is generally recommended to select a lower range, such as first or second gear, while going down grades. This provides more engine braking and helps control the speed of the tractor.
Step-by-step explanation:
In a tractor with an automatic transmission, the appropriate range to select while going down grades depends on the specific tractor model. However, in general, a lower range, such as first or second gear, should be selected. This is because lower gears provide more engine braking, which helps slow down the tractor and maintain control while descending steep grades.
By selecting a lower gear, the automatic transmission will downshift and engage a lower ratio, which increases the engine's resistance against the wheels. This helps to prevent the tractor from gaining too much speed and potentially causing an unsafe situation. Additionally, it reduces the strain on the brakes, as the engine provides some of the braking force.
It is important to follow the manufacturer's recommendations for operating the tractor on grades and to be aware of the specific gear ranges available in the tractor's transmission. Using the appropriate range while going down grades promotes safety and helps to prevent potential damage to the tractor's braking system.