Preventing Coupling and Uncoupling Accidents
Let’s Talk Safety
Coupling and uncoupling tractor trailers is something most of us do every day without much thought. Because it’s routine, it’s easy to move quickly—or even skip a step. Unfortunately, this is when serious injuries, equipment damage, and costly downtime can happen. The good news? Most coupling and uncoupling accidents are completely preventable with a little extra attention and the right habits.
Where Things Usually Go Wrong
Understanding common trouble spots can help us stay ahead of accidents:
- Alignment Issues: If the tractor and trailer aren’t lined up straight, the fifth wheel may not lock properly. Trailer height also plays a big role.
- Missed Inspections: Worn or damaged fifth wheels, kingpins, or locking jaws can cause failures when you least expect it.
- Poor Communication: Misunderstandings between drivers and spotters can lead to unsafe movements.
- Rushing the Process: Skipping even one step can cause rollaways or dropped trailers.
- Surface Conditions: Uneven or soft ground, ice, snow, or debris can affect stability and traction.
Safe Coupling Starts Here
Before you back under a trailer, take a few moments to do it right.
- Inspect Before You Couple: Check the fifth wheel, kingpin, and locking mechanisms for damage or wear.
- Check the Height: The trailer should be low enough that the tractor slightly lifts it when backing underneath.
- Line It Up: Make sure the tractor is straight with the trailer to prevent mis-coupling.
- Do a Tug Test: After coupling, gently pull forward to confirm the fifth wheel is securely locked.
- Verify the fifth wheel is locked: A flashlight is your best friend—use it! Visually inspect that the fifth wheel jaws are locked around the trailer kingpin. Also, double check that the fifth wheel release handle is in the locked position.
- Hook Everything Up: Connect air and electrical lines and check for leaks or defects.
- Last Step: Raise the landing gear only after everything else is verified.
Uncoupling Without Incident
When it’s time to drop a trailer, slow down and follow these steps:
- Pick the Right Spot: Choose level ground with plenty of clearance. Never drop a loaded trailer on asphalt and use dolly pads when dropping on gravel surfaces.
- Set Brakes and Chock Wheels: Apply the trailer brakes and put the wheel chocks in between the trailer duals. Also take a moment to inspect the landing gear for any damage.
- Lower the Landing Gear: Extend the landing gear until it touches the ground to support the trailer’s weight.
- Disconnect Safely: Unhook air and electrical lines and stow them properly.
- Release the Fifth Wheel: Open the fifth wheel by pulling the fifth wheel release handle.
- Pull Away Slowly: As an added safety measure, complete a full walk around of your truck and trailer to ensure you are you are clear to disconnect. Ease the tractor out from under the trailer and watch for any movement.
Preventing Incidents Before They Happen
- Follow Procedures Every Time: Always stick to the LGT Transport Coupling and Uncoupling Procedures.
- Speak Up About Equipment Issues: Report worn or damaged equipment immediately. A faulty fifth wheel can cause a trailer to drop miles down the road.
- Stay Focused: Distractions and fatigue lead to missed steps. Give this task your full attention—trailers have been dropped simply because a step was assumed, not verified.
- Use Your PPE: Gloves and safety shoes are a must. We also recommend using a fifth wheel puller/hook to reduce the risk of injury when releasing the jaws. Use a flashlight!
Final Thought
Coupling and uncoupling may be routine, but it’s never “just another task.” Taking a few extra seconds to follow the process, inspect equipment, and stay alert can prevent serious injuries and equipment damage. Let’s look out for ourselves and each other—every connection matters.
Questions or Concerns?
If you have questions or need clarification on coupling and uncoupling safety, please contact the LGT Safety Department or your Terminal Manager.
