Mercedes-Benz AROCS 2551 Used Trucks - Current Offers for Sale

Powertrain and Driveline

The Mercedes-Benz Arocs 2551 features the OM 471 LA 12.8L inline-six turbodiesel engine, delivering 510 hp (375 kW) and 2,500 Nm torque at 1,100 rpm. Engineered with a cast iron CGI head and monolithic crankcase for maximum rigidity, it utilizes steel pistons and a long-stroke (132 x 156 mm) design for superior low-end torque. The X-Pulse APCRS injection system enables variable pressure up to 2,700 bar at injector level, improving combustion control and efficiency. An asymmetric turbocharger minimizes lag, paired with a turbo-decompression engine brake providing up to 340 kW (or 720 kW total with High Performance Engine Brake and VIAB in heavy-duty configurations). Standard transmission is the PowerShift 3 automated manual—offered as G 280-16 (16-speed) or G 330-12 (12-speed)—with sector-specific offroad, rocking, and crawl modes.

Chassis, Frame, and Suspension

The Arocs 2551 is built on modular frame architectures: narrow (744 mm) for maximum torsional flex in off-road "Grounder" and wide (834 mm) for stable "Loader" highway operation. Frame thickness varies (7–9 mm, fine-grained steel) with Loader prioritizing tare weight reduction and Grounder maximizing durability with reinforced 9 mm rails and planetary hub-reduction axles (up to 16t axle rating). Suspension options include parabolic multi-leaf steel, full air, or hybrid setups. The VIAB Turbo Retarder Clutch and Hydraulic Auxiliary Drive (HAD) offer wear-free start-off/braking and up to 40 kW of hydraulic front-axle traction for intermittent off-road use without permanent AWD weight penalties.

Axle Topologies and Steering

Available axle configurations include 4x2, 6x2 (ENA, VLA), 6x4, and 4x4, with planetary or hypoid rear axles, differential locks, and off-road tire options up to 325/95 R24. Servotwin electro-hydraulic steering delivers speed-sensitive assist, return-to-center function, and enables steerable/raise-lower trailing axles for minimized turning circle and reduced tire wear.

Cabin and Digital Systems

Cab variants include ClassicSpace, StreamSpace, and BigSpace, with widths up to 2.5 m and full standing height, all featuring galvanized cabs, steel bumpers, headlight guards, and flexible steps. The Arocs 5 generation introduces MirrorCam digital exterior mirrors, dual 15" interior displays, and Multimedia Cockpit Interactive 2 with Apple CarPlay and customizable virtual switches. The Parameterizable Special Module (PSM) and ASAM manage advanced bodybuilder integration, programmable CAN interfaces, high-amperage power tap points, and PTO logic. Safety highlights include ABA 5 with pedestrian detection and Active Sideguard Assist with autonomous intervention. The Predictive Powertrain Control system delivers GPS-based gear/throttle management for maximum transport efficiency across mixed routes.