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Flachs RK-40-10 – a heavy EU class O4 trailer with a 15,000 kg gross weight, 11,540 kg kerb weight, 12,500 mm length and a design speed limited to 80 km/h
The Flachs RK-40-10 belongs to EU trailer class O4, covering all trailers and semi-trailers with a gross vehicle weight above 10,000 kg. This class requires compressed-air brakes, fed from the towing vehicle's brake system, and trailers of this kind run in long-distance haulage behind suitably approved tractor units or lorries.
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At a gross weight of 15,000 kg and a kerb weight of 11,540 kg, the payload comes to about 3,460 kg. At 12,500 mm long, 2,550 mm wide and with an 8,850 mm wheelbase, it is laid out for long rather than extremely heavy loads. Unlike most trailers of this size, its design top speed is limited to 80 km/h rather than the usual mark.
Trailers of this type and length are used for general cargo, long components or machinery that need more load area than payload capacity. The compressed-air brake system, with its lines, coupling heads and a brake cylinder on each axle, needs to be leak-free and correctly adjusted to reach full braking effect.
When buying used, check the air lines for cracks and the coupling heads for tightness, as well as the brake cylinder stroke on each axle. Because of the long build, the chassis deserves particular attention for distortion and corrosion at the cross members. Wheel bearings, tyres and the drawbar coupling gear complete the inspection.
Sources: SpecCodex-Register: Kennwerte des Modells RK-40-10
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