HOW TO Drive Semi Truck Automated (Automatic) Transmission

Introduction

This tutorial provides a comprehensive guide on how to drive a semi-truck equipped with an automated (automatic) transmission, specifically focusing on the 2020 Peterbilt model. Understanding the operation of an automatic transmission can enhance your driving experience and safety, especially for new drivers.

Step 1: Familiarize Yourself with the Controls

• Locate the shifter on the right side of the steering wheel.
• Understand the positions on the shifter:
  • D for Drive
  • N for Neutral
  • R for Reverse

Step 2: Starting to Drive

• Always press the brake pedal before shifting.
• To shift into Drive:
  • Press the brake.
  • Move the shifter to the D position.
• Check the dashboard to confirm it is in Drive (the D should be illuminated).
• The truck will usually start in second gear, especially when loaded.

Step 3: Shifting Gears

• The automatic transmission will shift gears automatically based on the weight of the load and driving conditions.
• You do not need to manually shift gears; the system is designed to optimize performance.

Step 4: Using Reverse

• To shift into Reverse:
  • Press the brake pedal.
  • Move the shifter to the R position.
• Confirm on the dashboard that the R is illuminated.

Step 5: Engine Braking on Steep Hills

• Use the engine brakes (compression brakes) for better control when descending steep hills.
• To activate:
  • Move the compression brake control downwards.
  • Each click down activates additional cylinders for braking (1 click = 2 cylinders, 2 clicks = 4 cylinders, etc.).
  • The fourth position provides maximum engine braking.

Step 6: Manual Shifting Mode

• To switch to manual mode:
  • Make sure the truck is in Drive.
  • Press the button marked M on the shifter.
• To shift gears manually:
  • Push the shifter forward to downshift (e.g., from 7th to 6th).
  • Pull the shifter towards you to upshift (e.g., from 7th to 8th).
• To return to automatic mode, press the M button again.

Step 7: Important Reminders

• Always use the brake pedal when shifting gears.
• Pay attention to the dashboard indicators to confirm the current gear and mode.
• If you leave the truck in manual mode unintentionally, it may not shift gears properly, resulting in high revs.

Conclusion

Driving a semi-truck with an automatic transmission is straightforward once you understand the controls and functions. Always remember to engage the brake when shifting, utilize engine braking on steep descents, and feel free to experiment with manual shifting if desired. Mastering these skills will enhance your confidence and safety on the road. Happy trucking!