Tas Heavy Vehicle Test Practice Questions - Tasmania Heavy Vehicle Licence Knowledge Test (Rigid Combination) Exam

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When uncoupling a semi-trailer, the driver finds the turntable jaw release handle cannot be moved. What is the likely cause and correct response?

The turntable jaws are seized with rust — call a mechanic The jaws are under load from the kingpin — gently rock the prime mover forward and back to release tension The landing gear has not been lowered far enough — lower it further The air hoses need to be disconnected first before the jaws can release

Correct Answer:

The jaws are under load from the kingpin — gently rock the prime mover forward and back to release tension

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