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The following steps will help you to uncouple safely.
Step 1: Position Rig
Step 2: Ease Pressure on Locking Jaws
Step 3: Chock Trailer Wheels
Step 4: Lower the Landing Gear
Step 5: Disconnect Air Lines and Electrical Cable
Step 6: Unlock Fifth Wheel
Step 7: Pull Tractor Partially Clear of Trailer
Step 8: Secure Tractor
Step 9: Inspect Trailer Supports
Step 10: Pull Tractor Clear of Trailer
After disconnecting the tractor from the trailer, what should you do when pulling away from the trailer?
Step 7: Pull Tractor Partially Clear of Trailer
This question will not be on the test, but it's very important in real life. After you have disconnected from the trailer, pull forward but do not pull completely out from under the trailer. Keep the frame of the tractor under the trailer, get out to check that the landing gear is on solid ground, then pull out the rest of the way.
Many trailers have sunk in soft gravel or mud deep enough that it took a lot of cranking on the landing gear or even a tow truck to life the trailer high enough to get a tractor under it again.
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