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Herrenknecht HK150T – O4-class trailer with a gross weight of 30,000 kg, an unladen weight of 27,500 kg and eight wheels, built in 2021.
Herrenknecht is a German engineering company for tunnelling and underground construction, best known for tunnel boring machines. The HK150T is a trailer from the company's own transport equipment fleet and, with a gross weight of 30,000 kg, falls into EU trailer class O4, the heavy trailers above 10 tonnes.
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With an unladen weight of 27,500 kg and eight wheels, the HK150T is a very heavily built chassis relative to its gross weight, typical for hauling tunnelling components and machine parts with high point loads: the structure has to carry concentrated loads rather than mainly extra cargo weight.
From class O3 upwards, trailers of this size are generally fitted with air brakes rather than the simple overrun brake used on light trailers. Towing it as a combination requires driving licence category C1E or CE in the EU, depending on the combined train weight. The eight wheels spread the high unladen mass and the point payloads across several axles, so that no single axle load exceeds the permitted range.
When buying a used unit, check the frame and the load-bearing points: cracks and deformation in the reinforcements for point loads matter more on special transporters than on simple load platforms. Check the brake system and air reservoirs for leaks, listen to the bearings on all eight wheels for play, and check the lashing points for wear.
Sources: SpecCodex-Register: Kennwerte des Modells Herrenknecht HK150T, Zulassungsdaten RDW (Niederlande), Herrenknecht
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