07 Uncouple Trailer

Performance Skill Standard:

Conditions of Performance:

  • Given verbal or written instructions about where and when to leave a trailer, and a trailer of any size attached to a tractor…

Statement of Work to be performed:

  • … The driver will demonstrate safe uncoupling of typical tractor-trailer units.

Performance Criteria:

  • Driver must uncouple tractor-trailer units within 5-7 minutes in accordance with approved procedures.
  • Complete uncoupling in accord with safety requirements and approved practices.
  • Secure trailer from movement.
  • Follow correct sequence for disconnecting electric lines and air hoses.

Performance Elements and Assessment Criteria:

  • Spot trailer on surface capable of supporting weight and secure vehicle against movement.
  • Set in-cab air brake controls and trailer brakes.
  • Lower gear to raise trailer to correct height and check support.
  • Uncouple trailer (disconnect dolly if applicable).
  • Disconnect and secure air and electrical units prior to uncoupling.
  • Pull tractor partially clear of trailer.
  • Secure tractor, check trailer supports and brakes/chocks.
  • Pull tractor completely clear of trailer.