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Visually inspect fifth wheel throat to ensure locks are completely open and ready to accept kingpin. IMPORTANT: DO NOT exhaust air from tractor suspension before uncoupling. If the pintle hook is not secured to the mounting surface, the pintle hook could separate from the vehicle which, if not avoided, could result in death or serious injury. Dropped trailers are very common in the trucking industry, simply because drivers become lazy and don't visually check the truck / trailer connection. The pull handle should be in the second locking position, and the jaws of the fifth wheel should be locked around the kingpin. Make sure air pressure is up to normal. Coupling System Areas. Both the upper and lower fifth wheels are well designed to allow vertical and rotational movements between the trailer and the tractor.
Because of the greater weight of the fifth wheel motorhome, you can expect the miles per gallon to decrease from 5-15 miles per gallon. A fifth wheel RV is a spacious type of motorhome that bridges the gap between the luxurious coach motorhomes, also known as Class A, and the travel trailers. If there is space, something is wrong (kingpin may be on top of the closed fifth wheel jaws, and trailer would come loose very easily). Wheel tilted down toward rear of tractor. I'm green, new to the trade, and have an appointment with TDOT next month to get my learner's permit; so I guess I'm just plain ignorant. Adjust tractor suspension to ride height. As I'm looking around trying to figure this out, it seems that the apron and upper fifth wheel are the same thing; and the lower fifth wheel is actually the fifth wheel glide plate...? If either above conditions do not exist, repeats Steps 4 – 6. Set the tractor parking brakes but wait to set the trailer spring brakes until the landing gear has been lowered and the air lines have been disconnected. Remove and store wheel chocks in a safe place.
Release the pull valve. Locking jaws that lock around the kingpin to couple the. Working with a small group, imagine you represent the interests of one the following: consumers, workers, clothing makers, or environmentalists. Rotate handle to this position (Fig. The device allows you to control the speed and direction of the trailer without it detaching from the tractor. An unobstructed circular opening through the center of the entire assembly allows the passage of product piping through the unit. Inspect Fifth Wheel. This Tech Tip is the first in a series to be issued by SAF-Holland. Lubricate dry or rusty components. Towing vehicle doubles as local transportation.
I thought the fifth wheel was that which is also called the "fifth wheel glide plate. " When only the trailer has ABS, the trailer is less likely to swing out, but if you lose steering control or start a tractor jackknife, let up on the brakes (if you can safely do so) until you gain control. Check that cargo (if any) is secured against movement due to tractor being coupled to the trailer. Connect Trailer Light Wiring. Sets found in the same folder. If you ask any truck driver what one of their worst nightmares is - chances are a dropped trailer is on their list. Stop with tractor frame under trailer (prevents trailer from falling to ground if landing gear should collapse or sink). Unlock and remove the tethered lock pin, if applicable (Figure 16).
The very qualities that make it so desirable can also present some possible problems to some potential buyers: - Requires a truck with a fifth wheel hitch in bed for towing. Usually within the range of 20 to 45 psi. Permits the use of PTO driven pump on tractor without using hydraulic drive systems, flexible or removable pump drives. When the trailer is not connected to the tractor, the front end of the trailer is supported by a retractable two-legged landing gear. To drive you need to raise the landing gear only until it just lifts off the pavement. No missing or damaged parts.
IMPORTANT: Never inflate the tractor suspension when the kingpin is above the throat of the fifth wheel. There should be space visible, but it should be less than 1 inch. The computer senses impending lockup, reduces the braking pressure to a safe level, and you maintain control. It's best to clean it out before winter is here. Tighten in both the lock screws (2, 2a) together with their relative self-locking nuts (12, 12a) at a 350 to 400 Nm torque wrench setting. You should hear the brakes move when applied and air escape when the brakes are released. Then stop and pull out the trailer air supply control (also called tractor protection valve control or trailer emergency valve), or place it in the "emergency" position. Inspect Area and Chock Wheels. Large trailers will require a medium to heavy-duty truck for towing. This will: - Make it easier to unlatch fifth wheel. How can you test the tractor protection valve?
If the trailer is too low, the tractor may strike and damage the trailer nose; if the trailer is too high, it may not couple correctly. Do not allow water and oil to build up in the. An operator driving a tractor with a trailer should be well trained and experienced. Simply click in your answer to each CDL practice test question. How can you test that air flows to all trailers? Failure to correctly lock the latch can result in separation of the trailer and vehicle which, if not avoided, could result in death or serious injury. The fifth wheel coupling equipment is portable and can be installed and uninstalled easily. Park the trailer on a firm level surface and block trailer tires. Push the latch closed. The movement of the kingpin into the fifth wheel jaws will allow them to open and successfully couple. Coupler will return to load position automatically. If it's a sliding fifth wheel, make sure both plungers are fully engaged. Once free of weight, switch to the high gear range.
8 – Uncoupling a Gooseneck Hitch. Never back under the trailer at an angle because you might push the trailer sideways and break the landing gear. Check fifth wheel (upper).
Make sure coupling area is flat, level, and clear of persons and obstacles. If the tractor protection valve doesn't work right, an air hose or trailer brake leak could drain all the air from the tractor. Locking jaws around the shank, not the head of kingpin. For the added length when turning, backing, and passing.
Securely mounted to frame. The trailer brakes should be tested with the hand valve but controlled in normal operation with the foot pedal, which applies air to the service brakes at all wheels. The locking mechanism should be inspected regularly every time the tractor is towing the trailer. Lock Safety Screw and Tighten Self-Locking Nut. Video Overview: How to Hook up a 5th Wheel. Air and electric lines to trailer. Not only can a dropped load be a very dangerous situation, but the recovery cost can exceed $1000. Locking handle outward, as shown in figure 7-14. Lower and Stow the Trailer Jacks. Dollies manufactured on or after March 1, 1998, are required to have a lamp on the left side.
Open the Latch and Lubricate the Gooseneck Ball. Rotate Handle and Raise Trailer Off Ball. Excessive amounts of water and oil. In the case of vehicles manufactured before the required date, it may be difficult to tell if the unit is equipped with ABS. Wrong coupling and uncoupling can be very dangerous. Students also viewed.
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