Selection of fifth wheel couplings and turntables for B-doubles and road trains
22 Selection of fifth wheel couplings and turntables for B-doubles and road trains
A fifth wheel coupling used in a B-double or road train must have a D-value complying with AS 1773-1990‘Articulated Vehicle—Fifth Wheel Assemblies’.
A turntable used in a B-double or road train must have a D-value complying with AS 1773-1990‘Articulated Vehicle—Fifth Wheel Assemblies’.
If a fifth wheel coupling used in a B-double or road train is built for a 50mm kingpin or 90mm kingpin, the coupling must—
meet the dimension requirements in AS 1773-1990‘Articulated Vehicle—Fifth Wheel Assemblies’; and
not be worn away more than recommended by the standard.
If a fifth wheel coupling used in a B-double or road train is built for a 75mm kingpin, the coupling must—
be compatible with a kingpin built as required by section 25(3)(a); and
not be worn so that it does not comply with subsection (5).
In testing a fifth wheel coupling used in a B-double or road train and built for a 75mm kingpin to decide whether its D-value complies with subsection (1), the longitudinal movement, after readjusting the jaws of the coupling using a kingpin built as required by section 25(3)(a), must not be more than 4mm.
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