Coupling Trailer To Truck
^ WARNING
Uncoupling hazard. A loose kingpin or fifth wheel can result in the trailer uncoupling, which can result in death or serious injury. Verify the kingpin and fifth wheel are tight.
3. Lubricate the fifth wheel lock mechanism and verify it will move freely. 4. Clear all hoses and electrical cables from the coupling area. 5. Verify the fifth wheel locks are open.
WARNING
Crushing hazard. Death or serious injury may occur if the trailer drops. Keep bystanders away from trailer while coupling.
3.5 COUPLE TRUCK TO TRAILER 1. Place wheel chocks behind the trailer tires. 2. Place the truck directly in front of the trailer. See Figure 3-3. NEVER back under the trailer at an angle.
Figure 3-3 – Align Truck with Trailer For Coupling
3. Back the truck until close to the trailer. 4. Apply the truck parking brakes and place transmission in neutral. 5. Release air from truck suspension (if equipped).
6. Inspect the height of the trailer vs the fifth wheel. The kingpin plate on the front of the trailer should first contact the fifth wheel 4-6 inches rearward of the fifth wheel centerline. See Figure 3-4. The trailer should raise slightly when the truck is backed under it. If the trailer is too low, the truck may strike and damage the front of the trailer. If the trailer is too high, it will not couple correctly. Adjust the landing gear as needed to achieve the correct trailer height.
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