Heavy Vehicle (Vehicle Standards) National Regulation
sch.3-sec.18General coupling requirements
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sch.3-sec.18 General coupling requirements
A fifth wheel coupling, the mating parts of a coupling, a kingpin or a towbar must not be used in a heavy combination for a load more than the manufacturer’s load rating. A kingpin must be used in a heavy combination only with a fifth wheel coupling that has a corresponding jaw size. An adaptor must not be used to fit a kingpin to a fifth wheel coupling. The mating parts of a coupling used in a heavy combination to connect a semitrailer to a towing vehicle must not allow the semitrailer to roll to an extent that makes the towing vehicle unstable. (sch.3-sec.18-ssec.1) A fifth wheel coupling, the mating parts of a coupling, a kingpin or a towbar must not be used in a heavy combination for a load more than the manufacturer’s load rating. (sch.3-sec.18-ssec.2) A kingpin must be used in a heavy combination only with a fifth wheel coupling that has a corresponding jaw size. An adaptor must not be used to fit a kingpin to a fifth wheel coupling. (sch.3-sec.18-ssec.3) The mating parts of a coupling used in a heavy combination to connect a semitrailer to a towing vehicle must not allow the semitrailer to roll to an extent that makes the towing vehicle unstable.