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fifth wheel coupling inspection

That said, they also need routine maintenance to keep them in serviceable condition. A procedural video of the required Fifth Wheel Coupling portion of the Commercial Driver's License (CDL) Class A Pre-Trip inspection. All questions in this Heavy vehicle section ( Vehicle Condition ) are listed below. If you do not achieve a proper couple, repeat the coupling procedure. It is critical to ensure that the coupling mechanism is in its best-operating conditions for it to function correctly. 15. Additionally, arc strikes or weld craters could develop a stress riser, leading to a fatigue failure. For multiple copies Follow your specific kingpin manufacturer’s instructions for maintenance and replacement procedures. by Rob Nissen, director of field service, SAF-Holland. If an add-on aftermarket lube plate is used in your operation, make sure to check the kingpin length. Colin Barge's comments back in 2009 should surely strike a chord with some operators today? What is the fifth wheel coupling used for? 3. It's almost four years since Colin Barge, then southern sales manager for drawbar equipment specialist VBG, wrote to Transport Engineer over concerns about growing complacency around maintenance and inspection of trailer couplings. What should you do if the air-pressure warning device starts to operate? 7. You notice that you're losing tread from one of your tyres. Your vehicle has broken down at night on a two-way road. Exit the cab and make sure the fifth wheel is below the upper coupler plate. / Systems, Consumables / Stress corrosion cracking was responsible for the failure of fifth wheel coupling. We respect your data and privacy. One-off usage is permitted but bulk copying is not. What's most likely to cause a burst tyre? When should you check the wheel nuts on your vehicle? Finally, crack morphology and fracture surface were examined. This includes weight-optimised pressed metal and robust cast steel couplings for imposed loads between 6 and 74 tonnes. Inspect fifth wheel mechanism. What will happen if you follow a regular vehicle maintenance schedule? 1.There were two failed components of the fifth wheel coupling, which were simultaneously found in a periodic inspection. What should you do if your power-assisted steering fails suddenly? The kingpin must be the proper length to couple properly with a fifth wheel. All Rights Reserved. What is the fifth wheel coupling used for? 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. If trailer is too low, use landing gear to raise the trailer height. There should also be a functional test, ideally using a hand-held test kingpin. That's the positive lock – the sliding bolt that moves across the top of the coupling. Lower the landing gear until the pads just touch the ground. Release the tractor parking brake and slowly pull away from the trailer. To assure proper and safe kingpin/fifth wheel coupling, kingpin inspection and maintenance should be conducted every three months or 30,000 miles. 12. Release the tractor parking brake. However, we recommend that you follow your specific fifth wheel manufacturer’s instructions. © 2010-2019 DT Driver Training Ltd. Crown copyright material is reproduced under licence from the Driving Standards Agency, which does not accept any responsibility for the accuracy of the reproduction. Where can you get advice to help carry out minor repairs? When should the wheel nuts be checked again? Place in neutral. 9. Slowly back into the trailer, engaging kingpin in the fifth wheel. Register The heavy duty semi-trailer tractor serves in Yunnan province, China, with a total weight of 89 tons. Stresses of the failed component were achieved by multibody dynamics analysis and FEM. The kingpin must be sized to compensate for the thickness of the lube plate. No gap is permissible between the trailer upper coupler plate and the fifth wheel.c. What's the advantage of energy-saving tyres? Kingpin inspections/maintenance should be conducted every three months or 30,000 miles. To assure proper and safe kingpin/fifth wheel coupling, kingpin inspection and maintenance should be conducted every three months or 30,000 miles. Where should you park your vehicle before checking the engine oil level? 12. Well no: it simply means that no one should rely on MOT testing as the last backstop of safety when it comes to checking couplings' fitness for purpose – and hence also their trailers' security in transit. About Us, Privacy Policy Others have since noted that there appears to be little or no check of visual secondary lock indicators on drawbar couplings, too. For proper positioning of the wheel, refer to manufacturer’s instructions. Lubricate fifth wheel-to-trailer contact surfaces, if needed. But, again, regular inspection is recommended. 11. 7. What can you add to diesel fuel to prevent it from becoming less effective at low temperatures? © 2020 Heavy Duty Trucking, Bobit Business Media. Fully retract the landing gear legs off the ground and secure the crank handle. 5. The truck used in the video is a Mack truck with an automatic transmission.SMG, Inc. is a certified third party CDL testing facility located in the State of Florida.Interstate Commercial Driving School (ICDS) is a Florida DOE, Commission of Independent Education, licensed truck driving school located in Crystal River, Florida. How should you try to leave the vehicle? Visually inspect uncoupling. According to truck and trailer manufacturers, the fifth wheel coupling system should be inspected every month or after 30,000 miles for efficient performance. 1. What effect can this have on your tyres? When should your lorry coupling system (fifth wheel) be checked and lubricated? For these reasons, SAF-Holland warns against any weld repairs. The following steps are recommended by SAF-Holland for coupling and uncoupling your fifth wheel. You're about to start a long journey midway through the day. "We offer a guide to where [the kingpin] should be on the jaw before it has to be replaced," he says. Remove the wheel chocks and continue with the pre-trip inspection. Couplings should be regarded as safety-critical fitments and so treated with the same respect as equipment such as brakes, suspension and steering systems. If kingpin replacement is required, a replacement kingpin should be selected which is similar to the type removed, or if a different style, one which can be adequately braced. Macroscopical cracks occurred in the rib plates of two fifth wheel couplings separately. Firstly, the chemical composition and metallographic microstructure of the material of the fifth wheel coupling were characterized using scanning electron microscopy with an energy dispersive spectrometer. Set tractor parking brake and place into neutral. The fifth wheel plate face MUST make contact with the upper coupler plate and raise the trailer. If the gage slides into the gage slot, replace the kingpin. 47036\Accident_waiting.pdf, Related Companies If the kingpin length is improper, the kingpin should be replaced. Corrosion shouldn't be a problem, given that all reputable coupling manufacturers powder coat their ramps. When would you use 'kickdown' on a vehicle that has automatic transmission? Position the tractor and trailer, in straight alignment, on firm, level ground clear of obstacles and persons. Fifth wheel should be between the front edge of trailer and kingpin. 11. Brian Tinham examines growing concerns about fifth wheel and drawbar maintenance and inspection . There were two failed components of the fifth wheel coupling, which were simultaneously found in a periodic inspection. What's this most likely to indicate? Where can you get advice about carrying out repairs to your vehicle? If this condition exists, replace the kingpin. First, attempt to move the kingpin by hand. RSS Disconnect the air and electrical lines from the trailer and secure to tractor. 13. How soon should it be replaced? If either above conditions do not exist, repeats Steps 4 – 6. Vehicle Parts Release handle is in extended “open” position. "I'm not so worried about the adjustment aspect," comments Deri. 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. 9. Fontaine Fifth Wheel sales manager Steve Marshall agrees, adding that technicians will also need a kingpin gauge to test the kingpin.

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