What does B in B-double mean?

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What does B in B-double mean?

”The ‘B’ in B-double stands for bridge,” writes Richard Davies, of Redfern, ”the bridge from the back of the first trailer to which the second trailer connects.

How do you uncouple a couple on a trailer?

6.3 Coupling and Uncoupling

  1. STEP 1: Inspect Fifth Wheel. Check for damaged/missing parts.
  2. STEP 2: Inspect Area and Chock Wheels.
  3. STEP 3: Position Tractor.
  4. STEP 4: Back Slowly.
  5. STEP 5: Secure Tractor.
  6. STEP 6: Check Trailer Height.
  7. STEP 7: Connect Air Lines to Trailer.
  8. STEP 8: Supply Air to Trailer.

What is the crack-the-whip effect?

A sudden maneuver by the tractor may cause the rearmost (last) trailer to swing violently and possibly roll over. This is known as the crack-the-whip effect. It is caused by rearward amplification: The farther a trailer is from the tractor, the more likely it is to start swinging dangerously out of control.

When should you uncouple a trailer?

If trailer is empty, lower the landing gear until it makes firm contact with the ground. If trailer is loaded, after the landing gear makes firm contact with the ground, turn crank in low gear a few extra turns. This will lift some weight off the tractor.

What is B-train truck?

B-Train means a combination of vehicles composed of a truck tractor and a semi- trailer, followed by another semi-trailer attached to the first semi-trailer by means of a fifth wheel coupler mounted on the first semi-trailer, within the axle spread of the first semi-trailer or not located more than 0.3 m behind the …

When backing under the trailer you should?

Before backing the tractor under the trailer, adjust the landing gear to position the trailer at the proper height. The trailer should be just low enough that it will be raised slightly by the tractor when the tractor backs under it.

What is Offtracking?

Offtracking. Offtracking is said to occur when a vehicle makes a turn and it rear wheels do not follow the same path as its front wheels. The magnitude of this generally increases with the spacing between the axles of the vehicle and decreases for larger radius turns.

What is a converter dolly?

Converter dolly. A motor vehicle consisting of a chassis equipped with one or more axles, a fifth wheel and/or equivalent mechanism, and drawbar, the attachment of which converts a semitrailer to a full trailer.