![]() You are about to back your tractor under a semitrailer. Service and emergency air lines from the vehicle to the trailer Glad hands are usually connecting which of these: While driving behind another vehicle under good conditions you should allow at least one second between your vehicle and the vehicle ahead for each_(how many) feet of your vehicle length? It will keep dirt or water out of the lines Why should you lock the tractor glad hands to each other or to a dummy coupler when you are not towing a trailer? What should you hook up before backing under? You are coupling a tractor to a semitrailer and have backed up but are not under it. When driving a set of doubles it is necessary to close which shut- off valves on the last trailer? The higher the center of gravity of your truck, the: You should turn wide as you complete the turn ![]() The safest way to make a turn without entering another traffic lane is to: The air brake leakage rate for a combination vehicle (engine off, brakes off) should be less than_psi per minute: Supply air to the system then pull out the air supply knob Before backing under the trailer, you should: You are coupling a tractor to a semitrailer. You should not back a tractor under a trailer until the whole system is: ![]() You have pushed in the trailer air supply valve. How much space should be allowed between the upper and lower fifth wheel after coupling? Which part of the kingpin should the locking jaws close around? When connecting the glad hands, press the two coupler rubber seals together at what angle to each other?īobtail tractors can take longer to stop than a combination vehicle loaded to maximum gross weightĪfter you have coupled the trailer, you should start raising the landing gear by using: Your emergency air line breaks or gets pulled apart while driving. Why should you be sure the fifth wheel plate is greased as required? If the trailer has no spring brakes, you could drive away but you wouldn’t have trailer brakes What will happen if the air lines are crossed when you hook up to an old trailer? Makes firm contact with the ground, then turn the crank handle a few extra turns When you are uncoupling a loaded trailer, you should lower the landing gear until it: This is done by:Īpplying and releasing the trailer brakes and listening for the sound of the brakesīefore you back under a trailer, make sure that: The safety catch for the fifth wheel locking lever must be _ for coupling to be completeĪfter you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. ![]() Where should you put the iron trailer supports before driving away?įully raised with the crank handle secured in its bracket What gear should the tractor be in after you uncouple the trailer and are inspecting the trailer supports? Tilted down toward the end of the trailer When coupling, the proper position of the fifth wheel is: The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the _ brake line: To unlock the fifth wheel, the locking lever should be placed in the _ position: When you get ready to back under a semitrailer, you should line up: The air leakage rate for a combination vehicle(engine off, brakes on) should be less than_psi per minute:Ĭompared to a straight truck or bus there are_things to inspect on combination vehicles:Ī tractor with a _ trailer will require the shortest amount of stopping distance: ![]() The emergency line is_and the service line is_: The air lines on combination vehicles are often colored to prevent them from getting mixed up. Off-tracking or cheating causes which of these to follow the wider pass while making a turn? The coupling is not right and should be fixed before driving the coupled unit The fifth wheel locking lever is not locked after the jaws have closed around the kingpin. When backing a tractor under a trailer, you should:Īfter the trailer has been coupled to the tractor, the tractor protection valve should be placed in what position? ![]()
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