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After the tractor is coupled, you should not move it until you push in the air supply knob and: Wait until the air pressure is normal. After coupling, you can make sure the air lines are not crossed because: When you pump the brake you will hear the brakes move and air escape.After you supply air to the trailer, make sure the air lines are not crossed and The trailer brakes are working. This is done by: Applying and releasing the trailer brakes and listening for brake sounds. There are two things that a driver can do to prevent a roll over.If you crossed the air lines, you could drive away but you wouldn’t have trailer brakes. This would be very dangerous. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control.
- Inspect fifth-wheel. Check for damaged/missing parts. …
- Inspect area and chock wheels. Area around vehicle clear. …
- Position tractor. …
- Back slowly. …
- Secure tractor. …
- Check trailer height. …
- Connect air lines to trailer. …
- Supply air to the trailer.
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How do I make sure air lines are not crossed?
After you supply air to the trailer, make sure the air lines are not crossed and The trailer brakes are working. This is done by: Applying and releasing the trailer brakes and listening for brake sounds. There are two things that a driver can do to prevent a roll over.
What happens if air lines are crossed?
If you crossed the air lines, you could drive away but you wouldn’t have trailer brakes. This would be very dangerous. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control.
Coupling and Uncoupling Tutorial
Images related to the topicCoupling and Uncoupling Tutorial
When checking the coupling system do you need?
- Inspect fifth-wheel. Check for damaged/missing parts. …
- Inspect area and chock wheels. Area around vehicle clear. …
- Position tractor. …
- Back slowly. …
- Secure tractor. …
- Check trailer height. …
- Connect air lines to trailer. …
- Supply air to the trailer.
Why should you connect the air lines to a dummy coupler when they are not in use?
Some vehicles have “dead end” or dummy couplers to which the hoses may be attached when they are not in use. This will prevent water and dirt from getting into the coupler and the air lines. Use the dummy couplers when the air lines are not connected to a trailer.
How do you supply air to the air tank on the trailer?
The relay valve connects the trailer air tanks to the trailer air brakes. As pressure builds up in the service line, the relay valve opens and sends air pressure from the trailer air tank to the trailer brake chambers, putting on the trailer brakes.
What will happen if the airlines are crossed when you hook up to an old trailer CDL?
What will happen if the air lines are crossed when you hook up to an old trailer? A If the trailer has no spring brakes, you could drive away but you would not have trailer brakes. Older trailers do not have spring brakes.
What happens if you hook up glad hands backwards?
If you hook them up backwards, the spring brakes won’t release. So if you get in the truck and try to pull away and the trailer brakes won’t release, get out and make sure that you’ve got the glad hand hooked up correctly. The red line goes on the driver’s side – it is always on the outside.
See some more details on the topic How do you make sure that the air lines are not crossed after coupling? here:
combination cdl Flashcards | Quizlet
After you supply air to the trailer, make sure the air lines are not crossed and The trailer brakes are working. This is done by:.
CDL Combination Vehicles Practice Test #3 | Trucker Country
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:
DMV PA – CDL Combination Vehicles Multiple Choice Test …
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:
Combination – CDL Flashcards | Chegg.com
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:.
When connecting the glad hands press the two seals with the couplers together at what degree to each other?
6.2.5 – Hose Couplers (Glad Hands)
When connecting the glad hands, press the two seals together with the couplers at a 90 degree angle to each other. A turn of the glad hand attached to the hose will join and lock the couplers.
How can you test that air flows to all trailers?
Check That Air Flows to All Trailers.
Use the tractor parking brake and/or chock the wheels to hold the vehicle. Wait for air pressure to reach normal, then push in the red “trailer air supply” knob. This will supply air to the emergency (supply) lines.
When inspecting the coupling check that the safety latch is?
Check that locking lever is in the “lock” position. Check that safety latch is in position over locking lever. (On some fifth wheels, the latch must be put in place by hand.) If the coupling is not right, do not drive the coupled unit; get it repaired.
When coupling and uncoupling What two things should you do to aid you in being safe?
- 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.
Pre-Trip:Air Lines
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What’s the final thing you should do after recoupling a trailer?
After recoupling a trailer, the last thing to do is release the trailer parking brake. Before you’ve done this, though, you will have checked the airbrake lines are secure, the electrics are connected and the lights are working, and you’ve raised the trailer legs.
Why should you lock the trailer glad hands to each other or dummy couplers when you are not towing a trailer?
1. Why should you lock the tractor glad hands (or dummy couplers) to each other when you are not towing a trailer? A The connected brake circuit becomes a back up air tank. B If you did not, you could never build system pressure.
What is the purpose of the service Air Lines?
Service air line:
The service line (also called the “control line” or “signal line”) carries air controlled by the foot brake or the trailer hand brake. Depending on how hard you press the foot brake or hand valve, the pressure in the service line will similarly change. The service line is connected to relay valves.
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.
What keeps the air in the tanks?
The air compressor pumps air into the air storage tanks (reservoirs). The air compressor is connected to the engine through gears or a v-belt. The compressor may be air cooled or may be cooled by the engine cooling system.
What is the correct setup for shut off valves?
All shut-off valves should be closed. All shut-off valves should be open. The valves at the back of the last trailer should remain closed. Only the valves on the back of the first trailer should be closed.
What will happen if the airlines are crossed when you hook up to an older trailer before 1975?
A driver crosses the airlines when hooking up to an old trailer. What will happen? The brake lights will not come on when the brake pedal is pressed. The brake pedal will work the trailer spring brakes instead of the air brakes.
What is off tracking mean?
Explanation When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is known as off-tracking, or “cheating.”
Which answer is correct for the air valves when testing the trailer service brakes only?
Which answer is correct for the air valves when testing the trailer spring / parking brakes only? EXPLANATION: To test the trailer spring brakes, you need to have the service brake off or released, parking brake off, trailer air supply out shutting the door to the trailer, and trolley released.
What is the difference between red and blue glad hands?
Gladhands are color coded. In North America, service lines are blue and emergency brake lines are red and are standardized by SAE International’s standard SAE J318.
CDL: How to Couple and Uncouple a tractor trailer.
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What does the red glad hand do?
Glad hands are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. The couplers have a rubber seal, which prevents air from escaping.
What side does the blue glad hand go on?
Blue line goes toward passenger side. Air goes through this to brake valve which applies the brakes. Red is your supply line, as Polar says, it supplies air to the trailer tanks and is used to release the parking brakes on the trailer.
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