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Ets S1 – EU class O4 trailer: 12,000 kg gross vehicle weight, 10,370 kg unladen weight, 9.90 m long, eight wheels, built 1982
With a gross vehicle weight of 12,000 kg, the Ets S1 falls into EU trailer class O4, the heavy trailers and semi-trailers above 10 tonnes with their own air brake system. Trailers in this class are towed by trucks or tractor units.
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The S1 was built in 1982, is 9,900 mm long, 2,500 mm wide and has a wheelbase of 4,830 mm; it runs on eight wheels. It has an unladen weight of 10,370 kg; against a gross vehicle weight of 12,000 kg, that leaves a payload of 1,630 kg.
Eight wheels across several axles combined with an unladen weight of 10,370 kg, close to the gross vehicle weight, point to a body carrying its own heavy equipment or a reinforced construction, with payload reduced accordingly. The class O4 air brake system needs sound lines and working brake cylinders on every axle carrying the eight wheels so that braking takes hold along the whole length of the vehicle.
When buying a trailer this old, the frame matters most: check the main beams for rust, cracks and earlier repair welds, and check all axles, axle bearings and suspension for wear. The brake system with its lines, cylinders and linings on the axles carrying the eight wheels, plus tyres and tread depth, belong on the checklist. With a build year of 1982, pay particular attention to corrosion on load-bearing parts after decades in service.
Sources: SpecCodex-Register: Kennwerte des Modells Ets S1
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