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Fromberger FCKS27-KURZ – an EU class O4 trailer with a 37,000 kg gross weight on a length of only 7,150 mm and six wheels
The Fromberger FCKS27-KURZ belongs to EU trailer class O4 and is therefore among the heavy trailers and semi-trailers above 10,000 kg gross vehicle weight that must carry compressed-air brakes. The suffix KURZ points to a shortened version within the range.
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At a gross weight of 37,000 kg and a kerb weight of 4,350 kg, the trailer carries a payload of about 32,650 kg on a length of just 7,150 mm. With six wheels, a 5,700 mm wheelbase and a width of 2,550 mm, a very high payload is concentrated on a short, compact load area.
This combination of short length, low kerb weight and very high payload is typical of trailers carrying dense, compact heavy loads such as bulk material, building materials or containers, where load capacity rather than load area determines the size. Chassis and axles are correspondingly heavily built for the concentrated axle load.
When buying used, the short chassis deserves particular attention for cracks and deformation around the axle mounts, since the high payload acts there over a small area. The compressed-air brake system, with its lines and cylinders at each of the six wheels, should be checked for leaks, as should the wheel bearings and the load platform for wear. The drawbar coupling and its locking pin are also worth a close look, since they carry the full pulling load of such a heavily laden short trailer.
Sources: SpecCodex-Register: Kennwerte des Modells FCKS27-KURZ
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