Contact Us Visually inspect uncoupling. Stresses in the crack regions were in tensile stress state under different loading cases and were much smaller than both the mechanical strength and fatigue strength of the material. August 31, 2020 You notice that the steering feels heavy. Just as important, Barge also highlighted what might be regarded as systemic failures even within VOSA (the Vehicle and Operator Services Agency), with the agency only testing trailer couplings' wear by 'applying the trailer parking brake and gently shunting the truck back and forth'. You're checking your vehicle’s tyres before starting a long motorway journey. And with the pressure on to get vehicles back on the road, it probably keeps on getting overlooked." And the latter is truly frightening. No gap is permissible between the trailer upper coupler plate and the fifth wheel.c. A trailer with a kingpin that can Any bumps, valleys, or warping will cause uneven loading of the fifth wheel, which could result in damage to the top plate and reduce lock life. • However, we recommend that you follow your specific fifth wheel manufacturer’s instructions. And that includes checking that the dog clip or karabiner, used to ensure the lock is closed correctly, is in place and working. A short kingpin will accelerate lock wear and may interfere with fifth wheel coupling. And that, in turn, means the onus is on transport managers to ensure that, whoever is responsible for maintenance and inspection, they are not overlooking the vehicle's couplings. What's the first thing you must do before you uncouple the trailer? Couplings are hardly high-tech fitments, but, given their function, they qualify as safety-critical. Related Downloads 13. Exit cab and verify proper fifth wheel to kingpin alignment. Beyond that, maintenance is about regular (again, weekly) cleaning and lubrication, with retightening at 2,500km after installation. What's the main reason for cleaning your wheels and tyres when you leave a building site? When would you use 'kickdown' on a vehicle that has automatic transmission? For proper positioning of the wheel, refer to manufacturer’s instructions. If locks are not completely open, check the following: a. All Rights Reserved. Pull the release handle. How frequently should the components of a fifth-wheel coupling be inspected? Online. To assure proper and safe kingpin/fifth wheel coupling, kingpin inspection and maintenance should be conducted every three months or 30,000 miles. What's it advisable to do when you replace a tubeless tyre? The kingpin must be the proper length to couple properly with a fifth wheel. Who will DVSA share this information with? Secondly, the mechanical properties of the material was investigated by tensile tests on specimens manufactured out from the failed fifth wheel couplings. It also shows how to adjust the fifth wheel, the torque rates, grease etc." The Driving Standards Agency does not endorse in any way any advertisement displayed on this website. As Howard Ostle, UK sales and marketing manager at VBG, puts it: "If the driver couples his trailer using only the primary lock on a drawbar coupling, and then executes the 'pull test', all that proves is that it's in position and holding the pin. This material is protected by MA Business copyright Clean grease grooves if a large amount of debris is present. "That means lubrication and visual inspection – as a minimum checking that no bends or cracks are evident, and that all the bolts holding the coupling onto the tractor unit are present. Stop when fifth wheel is under the leading edge of the trailer. Copyright © 2020 Elsevier B.V. or its licensors or contributors. How should you try to leave the vehicle? Thereafter, VBG states that service intervals depend on trailer type, loads, roads and the environment – although it makes sense to co-ordinate the work with other vehicle inspections, say, every 60,000—90,000km. 9. If flatness exceeds the specifications as shown in Figure 2, replace the trailer upper coupler plate. The location of the fifth wheel coupling in the tractor and the structure of the fifth wheel coupling can be seen in Fig. NOTE: The above steps are recommended by SAF-Holland for proper inspection and maintenance of kingpins. Otherwise, the kingpin will be too short. Slowly back the tractor tightly against the trailer to relieve pressure on the fifth wheel locks. The movement of the kingpin into the fifth wheel jaws will allow them to open and successfully couple. The coupling consists of a kingpin, a 2-or-3 1 ⁄ 2-inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel on the rear of the towing vehicle. What's most likely to cause a burst tyre? Where should you park your vehicle before checking the engine oil level? Serving Car & Truck Fleet Management Professionals, Serving Corporate, Executive, & Financial Managers Of Large Commercial Fleets, Serving Public Sector Fleet Professionals, Serving Transit Bus, Private Motorcoach, & Passenger Rail Professionals, Serving School & Pupil Transportation Fleet Professionals, Serving Leaders In Fleet Mobility & Emerging Technology, Serving Medium & Heavy Duty Commercial Truck Professionals, Serving Vocational & Service Fleet Professionals.
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