1. To start from a standstill
Semi-trucks are very heavy, and it takes a lot of power to get them moving from a standstill. The lower gears provide the necessary torque to get the truck rolling.
2. To climb hills
Hills can be a challenge for semi-trucks, especially when they are heavily loaded. The lower gears provide the extra power needed to climb hills without losing speed.
3. To slow down
When a semi-truck is going downhill, it is essential to be able to slow down safely. The lower gears help to create engine braking, which helps to slow the truck down without using the brakes too much.
4. To maneuver
When maneuvering in tight spaces, such as a parking lot or a loading dock, semi-trucks need to be able to move slowly and precisely. The lower gears allow the truck to do this without jerking or lurching.
5. To save fuel
In addition to improving performance, semis can also save fuel by using the appropriate gear. By staying in a lower gear longer, the truck can avoid revving the engine too high, wasting fuel.
The average semi-truck has 18 gears, although some can have up to 22 gears. Each gear serves a specific purpose, and they all work together to help semi-trucks safely and efficiently transport goods.
