Fm5 Other models
1 model in this series
Fm5 S3NA – a heavy EU class O4 trailer with a 39,000 kg gross weight, 10,100 kg kerb weight, 13,800 mm length and six wheels on a 9,230 mm wheelbase
The Fm5 S3NA 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 and run in long-distance haulage behind suitably approved towing vehicles.
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At a gross weight of 39,000 kg and a kerb weight of 10,100 kg, the trailer carries a payload of about 28,900 kg, almost three times its own weight. At 13,800 mm long, 2,550 mm wide, with six wheels and a 9,230 mm wheelbase, it is built for heavy, compactly distributed loads of the kind a six-wheel axle group can carry.
Trailers with this ratio of kerb weight to payload are used for heavy bulk goods, building materials or machinery, where the weight of the load matters more than its volume. The six wheels spread the high axle load across several contact points, which calls for a working load-equalising mechanism between the axles.
When buying used, the axle spindles and the load-equalising mechanism between the axles deserve particular attention, as damage from overloading shows up there first. The compressed-air brake system, with its lines, coupling heads and a brake cylinder on each axle, should be checked for leaks. Tyres, wheel bolts and the chassis around the axle mounts complete the inspection. A close look at the coupling eye for wear is worthwhile as well, since it carries the full pulling load of the heavily laden trailer.
Sources: SpecCodex-Register: Kennwerte des Modells S3NA
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Trailer in 3D section
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