Preparing the Trailer for Uncoupling
108SD d 17.03.002
Before using the air valve to unlock a fifth wheel kingpin, prepare the trailer as follows.
- Apply the vehicle and trailer parking brakes.
- Chock the rear trailer tires.
- Lower the trailer landing gear until the weight is removed from the fifth wheel.
- Disconnect the tractor-to-trailer air lines and electrical cable. Plug the air lines to prevent dirt or foreign material from entering the lines.
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