When backing a tractor under a trailer you should expect that?

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.

When backing under a trailer you should expect?

5. When backing under a tractor under a trailer you should expect: A Trailer will be lifted slightly when the tractor backs under it.

When backing up the tractor to couple with the trailer you must?

Coupling a tractor and trailer

  1. Align the tractor and trailer, reversing the vehicle until the fifth-wheel is just ahead of trailer, touching the trailer or slightly under, but not against the kingpin.
  2. Exit the tractor and check the upper coupler and confirm that the kingpin is aligned (no more than 10 cm {4 in.}
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What should you hook up before backing under?

Before backing under the trailer, you should: Supply air to the trailer system, then pull out the air supply knob to lock the trailer brakes. The hand valve should be used: To test the trailer brakes.

What would happen if the emergency air line between the tractor and trailer came apart?

Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the: a. Emergency trailer brakes to come on.

What might happen if the trailer is too high when you try to couple?

In addition to incorrect coupling, if a trailer is too high off the ground and you try to back into it, you may cause damage as the rear of your truck cab could strike the front of the trailer. Further, the trailer king pin may become stuck in front of the fifth wheel plate which can be a costly and time wasting error.

When you turn suddenly while pulling doubles which trailer is most likely to turn over?

When you turn suddenly while pulling doubles, which trailer is most likely to turn over? The rear trailer is twice as likely to turn over as the tractor.

What happens when you cross the air lines of an older trailer without spring brakes?

You cross the air lines when hooking up to an old trailer. What will happen? If the trailer has no spring brakes, you could drive away buy you wouldn’t have trailer brakes. … In normal driving, some drivers use the trolley (hand) valve before the brake pedal in order to prevent trailer skids.

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What should you do to stop a trailer skid?

What is the first thing you should do to prevent a trailer skid? Step on the brakes hard several times to stop the skid. Recognize that a skid has started to occur in the mirrors. Use the trailer hand brake.

What tractor trailer combination is most likely to roll over?

Fully loaded rigs are ten times more likely to roll over in a crash than empty rigs. The following two things will help you prevent rollover–keep the cargo as close to the ground as possible, and drive slowly around turns. Keeping cargo low is even more important in combination vehicles than in straight trucks.

What gear should the tractor engine be in after you have uncoupled?

15. You want to inspect the trailer support. You should place the tractor transmission in which gear after you have uncoupled the trailer? Neutral.

Which vehicles off track the most?

The rear wheels follow the same path as the front wheels. If there is more than one trailer, the rear wheels of the last trailer will off-track the most. Longer vehicles off-track less.

When lowering the landing gear you should?

When operating the landing gear, use two hands and square feet up to handle. When lowering and raising the landing gear, ensure it is in the proper gear. When the trailer is loaded, the landing gear should be in low gear.

What happens if the service airline comes apart?

If the service air line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away? A Nothing is likely to happen until you try to apply the brakes. B You’ll come to a complete stop.

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Where should the tractor be when you inspect landing gear after uncoupling the trailer?

There is enough clearance between the tractor frame and the landing gear. When you are uncoupling a loaded trailer you should lower the landing gear until it: Make firm contact with the ground, then crackle hits a low gear a few extra turns.

What happens when you cross Air Lines?

If you do cross the air lines, supply air will be sent to the service line instead of going to charge the trailer air tanks. Air will not be available to release the trailer spring brakes (parking brakes). If the spring brakes don’t release when you push the trailer air supply control, check the air line connections.

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