Practice question

What is the critical check for the 'kingpin' connection when coupling a tractor to a semi-trailer?

  1. The kingpin must be lubricated with engine oil
  2. The lock jaw of the fifth wheel must be completely closed around the shank of the kingpin
  3. The kingpin must remain loose to allow steering
  4. The kingpin must be bolted to the fifth wheel

Answer: B — The lock jaw of the fifth wheel must be completely closed around the shank of the kingpin

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