Mercedes-Benz AROCS 3251 TRIDEM Used Trucks - Current Offers for Sale

Powertrain and Driveline

The Mercedes-Benz Arocs 3251 Tridem features the OM 471 six-cylinder inline diesel engine, delivering 375 kW (510 hp) at 1600 rpm and peak torque of 2500 Nm from 1100 rpm, with a flat torque band starting as low as 800 rpm. Recent generation OM 471 units utilize the X-Pulse Common Rail injection system with in-injector pressure amplification, asymmetric fixed-geometry turbocharging, and increased compression ratio, achieving thermal efficiency up to 48%. The Top Torque function provides an extra 200 Nm in higher gears when paired with the PowerShift 3 automated gearbox, improving performance on gradients. The optional VIAB Turbo Retarder Clutch (TRC) integrates hydrodynamic launching and retarder functions for clutchless starts under heavy load and superior downhill braking. The HAD (Hydraulic Auxiliary Drive) system is available for front-wheel traction on demand, maintaining low curb weight and minimizing drivetrain drag.

Chassis and Suspension

Configured in Tridem 8x4*4 layout, the Arocs 3251 deploys a front steered axle followed by a triple rear group: two driven axles and a steered, liftable trailing axle, significantly reducing turning radius and tail swing compared to classic 8x4. Front axles feature parabolic suspension rated at up to 9,000 kg. Rear axles employ pneumatic suspension and planetary hub-reduction, with axle spacing designed for optimal legal and operational payloads. Common wheelbases include 3900 mm, 4250 mm, and 4550 mm, supporting frame lengths suited for hooklift, crane, or tipper setups. Payloads range from 13,600 to over 18,200 kg, depending on body and curb weight.

Advanced Systems and Operator Environment

The Servotwin electro-hydraulic steering system with active assistance enhances low-speed maneuverability and road stability. MirrorCam digital camera-based side view replaces conventional mirrors for superior visibility and minimized blind spots, integrated with the digital Multimedia Cockpit. Cab options include ClassicSpace L or M variants, 2.3 m wide, designed for operational ergonomics and visibility. The chassis is optimized for complex superstructures, with exhaust, DPF, and AdBlue components relocated to facilitate body installations.

Bodywork and Applications

The platform accommodates hooklift systems (up to 24 t), hydraulic cranes (e.g., HIAB X-HIPRO with 18.5 m extension and 1,220 kg at max reach), and tipper bodies of 14–21.7 m³ capacity, including Bordmatic hydraulically operated sideboards. The Tridem's unique axle and steering configuration make it particularly suited for urban, municipal, and confined construction environments requiring precise maneuvering with high payloads.