When you are uncoupling a loaded trailer, lower the landing gear until it:

Makes firm contact with the ground.. Section 6.4: Lower the gear until it makes firm contact. Then turn the crank in low gear a few extra

When you are uncoupling a loaded trailer, lower the landing gear until it:

ANSWER BREAKDOWN
  • A. Correct. Lower the gear until it makes firm contact. Then turn the crank in low gear a few extra turns to take some weight off the tractor.
  • B. Incorrect. "Lifts the trailer off the fifth wheel." is not correct. Lower the gear until it makes firm contact. Then turn the crank in low gear a few extra turns to take some weight off the tractor.
  • C. Incorrect. "Just touches the ground." is not correct. Lower the gear until it makes firm contact. Then turn the crank in low gear a few extra turns to take some weight off the tractor.
  • D. Incorrect. "Is fully extended." is not correct. Lower the gear until it makes firm contact. Then turn the crank in low gear a few extra turns to take some weight off the tractor.