When should you uncouple a trailer?
The following steps will help you to uncouple safely.
- STEP 1: Position Rig.
- STEP 2: Ease Pressure on Locking Jaws.
- STEP 3: Chock Trailer Wheels.
- STEP 4: Lower the Landing Gear.
- STEP 5: Disconnect Air Lines and Electrical Cable.
- STEP 6: Unlock Fifth Wheel.
- STEP 7: Pull Tractor Partially Clear of Trailer.
- STEP 8: Secure Tractor.
What is the correct order of steps for uncoupling double trailers?
6.3 Coupling and Uncoupling
- STEP 1: Inspect Fifth Wheel. Check for damaged/missing parts.
- STEP 2: Inspect Area and Chock Wheels.
- STEP 3: Position Tractor.
- STEP 4: Back Slowly.
- STEP 5: Secure Tractor.
- STEP 6: Check Trailer Height.
- STEP 7: Connect Air Lines to Trailer.
- STEP 8: Supply Air to Trailer.
What should you hook up before backing under the trailer?
Before backing under the trailer you should: Supply air to the trailer system, then pull out the air supply knob.
What might happen if the trailer is too high when you are coupling to it?
What might happen if the trailer is too high when you try to couple? If the trailer is too low, the tractor may stike and damage the trailer nose; if the trailer is too high, it may not couple correctly. After coupling, how much space should be between the upper and lower fifth wheel? There should be no space.
When you are uncoupling a loaded trailer you should lower the landing gear until it?
Always. When you are uncoupling a loaded trailer, lower the landing gear until it: Makes firm contact with the ground and you lift the trailer off the fifth wheel.
What 3 methods can you use to secure a second trailer before coupling?
What three methods can you use to secure a second trailer before coupling? 1) Connect the emergency line, charge the trailer air tank, and disconnect the emergency line. 2) Spring brakes. 3) Wheel chocks.
What does Black stand for when coupling a trailer?
You may find it useful to memorise an acronym in order to remember the safe order. One such example is P-BLACK for uncoupling (remove number Plate and then engage parking Brake, lower Legs, disconnect Airlines, remove Clip and release Kingpin handle. You then use the reverse for coupling.
When you couple a trailer to a tractor The trailer is at the right height when?
The trailer is at the right height when: It will be raised slightly when the tractor is backed under it.
When hooking a tractor to a trailer you will know the trailer is at the correct height when the?
The trailer is at the right height when the: A Trailer will be lifted slightly when the tractor backs under it. Step 6: The trailer should be low enough that it is raised slightly by the tractor when the tractor is backed under it.
What three methods can you use to secure a second trailer before coupling?
When coupling a trailer you should raise the landing gear?
After you have coupled the trailer you should have to raise the landing gear by using: Low gear. You supply air to the trailer tanks by: Pushing in the trailer air supply valve.
Where should the tractor be when you inspect landing gear after uncoupling the trailer?
Where should the tractor be when you inspect the landing gear after uncoupling the trailer? Pull the tractor forward after unlocking the fifth wheel until the fifth wheel is out from under the trailer but the tractor frame is still beneath the trailer.
Should the shut off valves on the middle trailer be open or closed?
Question 13: On a double tractor-trailer combination equipped with shut-off valves; which shut-off valves should be closed and which should be open? The valves on the back of the first trailer should be closed. The valves on the rear of the scond trailer should be open.
What colour line shouldn’t you connect to the trailer?
What colour is the line you shouldn’t connect to the trailer? Explanation: When connecting a three-line tractor unit to a two-line trailer, the blue line is the one that shouldn’t be connected to the trailer. This is the auxiliary line.
When uncoupling a trailer after you have shut off?
When uncoupling the trailer, after you shut off the trailer air supply and lock the trailer brakes, you should: A Back up gently to ease pressure on the fifth wheel. Step 2: Ease Pressure on Locking Jaws – Ease pressure on fifth wheel locking jaws by backing up gently.
When coupling a semi trailer before you back the tractor underneath it you should?
4. When you get ready to back under the semi trailer you should line up: A About 12 degrees off the line of the trailer.