The dolly tow bar may fly away, possibly causing panic, and making it very difficult A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. 10. If there is 0000003060 00000 n Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . A. allow "much more space" than is needed for ideal driving conditions How do you check to make sure trailer height is correct before coupling? We've all wondered if the adventure and challenges of life on the open road would suit us better than the ordinary day to day lives we've always known. Email Updates When New Articles Are Posted. Never pull any trailer without visually inspecting the fifth wheel locking bar The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD 0000001375 00000 n What does the Driver's manual say about how much space you should keep ahead of your truck? Shut-off valves (at rear of trailers, in service and emergency lines): When pulling doubles or triples, what is important to know about the order of the trailers? 0000004668 00000 n What do you check when making a visual check of coupling? The service air line is only used to control the service brakes (when you press on the brake pedal or use the trailer hand-valve). Pickup at South Loop. Which trailer should come first behind the tractor? Which of these is most likely to occur? A. open If you're pulling more than one trailer, all valves should be open except the very last trailer, which should have all valves in the closed position. These mirrors: Question 3 Explanation: All of the above. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. You must stop, yield to traffic and pedestrians, and only proceed when safe. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? 0000010285 00000 n Sketch the shape of the passage between sections 1 and 2. They are filled by the emergency (supply) line from the tractor. 6. New! A. closed; latched D The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. On double and triple combinations, you must make sure that which of these is secure? NPT thumbscrew style design enables easy installation. Often do not have spring brakes If you want to couple a second trailer to your combination vehicle, secure it by using: The crack-the-whip effect that troubles trucks with trailers is most likely to cause a tip over: You are driving on a slippery road during the day. How can you test that air flows to all trailers? You shouldn't stop braking. Explore now! 1/2 to 3/4 of an inch B. pull gently against the pin of the second semitrailer True! What three methods can you use to secure a second trailer before coupling? Tips for Backing Up a Trailer Like a Pro Trucker. These mirrors: make things seem smaller & further away then they really are. The weight of the individual trailers will have no noticeable effect on the handling of the vehicle, The weight of all trailers should be nearly the same, within 2% of each other. A converter dolly is still under the second trailer when you unlock the pintle hook. Join 50,000+ users around America to get your Commercial Driver License today! symptoms of a bad fuel tank selector switch. Submit your email at the end of the test. Be sure air-lines are supported and glad hands are properly connected. c. iron On a triple combination, the shutoff valves on the rear of the last trailer should be? Doubles and triples take up more space than other commercial vehicles. Use the dummy couplers when the air lines are not connected to a trailer. you should avoid traveling next to others when possible. At section 2 downstream, the speed is 519 m/s. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. You can reset the test and retake it as needed. which of these statements about managing space to the sides is true? Which of these statements about managing space to the sides is true? Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). How do you know if your converter dolly is equipped with antilock brakes? 7. retrovirus $_____________________________$. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. When inspecting doubles and triples you must make sure there is air all the way to the back of the last trailer, otherwise what may not work? Also available in App Store & Google Play. When checking your air lines, they must be secure and? fumoto drain valve. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. Secure converter gear support in raised position. 0000007487 00000 n That there is no space between upper and lower fifth wheel. Each trailer and converter dolly has one or more air tanks. B. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? It is very important to keep the air supply clean. The dolly tow bar may flip up causing bodily injury and making it very difficult to How do you know if your converter dolly is equipped with antilock brakes? the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. driven with care to avoid losing control, Make sure the spare tire is secured, if it has one, Make sure the converter dolly air tank drain valve is closed, Make sure safety chains are secured to the trailers, All of the above. When uncoupling a rear trailer, you should remove some weight from the dolly by? If the fifth wheel on a coupling is too far forward, the tractor frame may hit? what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. 2. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and Why should you use chocks when parking a trailer without spring brakes? The dolly will have a yellow lamp on the drivers (left) side. Be certain you are clear at the sides before changing lanes. True! You are driving a 100-feet truck with double trailers at 30 mph. A. opening the air tank petcock coupled to the rear of a tractor-trailer combination forming a double bottom rig, A coupling device of one or two axles and a sixth wheel by which a semitrailer can be You wish to turn right from one two-lane, two-way street to another. You should NOT: Charge the system and pump the brakes with the window down. C. close the shut-off valves at the rear of the first trailer and open the shut-off valves at the rear of the second trailer, To check that the converter dolly is securely coupled to the rear trailer, you should: The application only takes one minute. View the full article to see how to set cruise control correctly! Number of wrong answers. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. You need to brake in order to regain control. You will speak with recruiters today. A vehicle transporting hazardous materials is required to display placards where? To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. You are driving with more than one trailer. However there are some states that allow doubles that are each 48 feet in length. What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? They provide the air pressure used to operate trailer brakes. C. use stab or controlled braking, Which of these is true? Provides a snug fit to eliminate unwanted seepage of air or water. 1) the first one is to pump down the air pressure in the system between 20 and 45psi (pounds per square inch) the trailer air supply will pop out, shutting air off to the trailer. B will have a lamp on the drivers side. A converter gear or dolly is a coupling device of one or two axles and a fifth wheel by which a semi-trailer can be coupled to the rear of a tractor-trailer combination forming a double bottom. They are filled by the emergency (supply) line from the tractor. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. If you are only pulling one trailer, make certain the valve is fully in the closed position or it will leak air out of the air system. Air valves should be closed on all trailers, Air valves should be open on all trailers, Rear of front trailers: closed, rear of last trailer: open, Rear of front trailers: open, rear of last trailer: closed. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. The shut off valves, when in the open position, allows air to flow out to another trailer. B. keep other traffic out of your side space Pull gently against the pin of the second trailer. This has the same value as the %%SCORE%% Variable on the Final Screen. B. are the easiest to stop since there is no shifting cargo Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. There is a school zone ahead. If you leave this page, your progress will be lost. In this order, the shutoff valves at the rear of front trailers, the rear of the last trailer and the converter dolly air tank drain valve should be? You should hear air escaping, showing the entire system is charged. Correct answer percentage. A) closed . Trucks with trailers have a dangerous crack-the-whip effect. When the road is dry The trailer brakes will unlock The couplers have a rubber seal that prevents air from escaping. A A. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. How can you be sure you supplied air to a second trailer? C You can find it here: High Road 2.0. B Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. In the coupling system, the locking jaws should be fixed around? Chock the tires, park on level ground and charge the trailer air tank if it does For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B There is no obligation whatsoever. You want to lock your combination to a second trailer that has no spring brakes. 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the converter dolly air tank drain valve should be
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