For off-road use Mercedes-Benz offers different all-wheel drive variants. If the payload and fuel consumption are to the fore, the engageable all-wheel drive is the right choice. If maximum traction is called for, the solution is permanent all-wheel drive plus a low-range ratio.
The third variant, the "Hydraulic Auxiliary Drive" (HAD), has caused a sensation in the sector. With engageable wheel hub motors at the front axle HAD covers road-oriented use with occasionally increased traction requirements. With HAD the Arocs reveals itself to be a true all-rounder. The driver engages HAD by pressing a button. The necessary slip-sensitive power transmission is then efficiently and steplessly controlled.
The advantages of the hydraulic drive are the comparatively low added weight, benefits in terms of fuel consumption and emissions, and great versatility in configuring the vehicle. In the case of Mercedes-Benz, these qualities are complemented by maintenance-free design, low fuel consumption with activated hydrostatic drive and, above all, the combination with the Mercedes PowerShift transmission. The Arocs HAD sets benchmarks in its segment: it is powerful, lighter than an all-wheel-drive model, easy to operate, maintenance-free and has a long service life. It lowers fuel consumption and consequently protects the environment as the result of low emissions.
The Arocs also offers new options in the area of the suspension and powertrain. The electrically supported Servotwin steering is now also available for the four-axle Arocs 8x4 and for other wheelbases, for example. The engageable hydraulic starting-off aid HAD (Hydraulic Auxiliary Drive) can additionally be used on semitrailer tractor variants with 3300 mm wheelbase for transporting hazardous goods. New options for the Arocs with HAD are the 320 mm engine tunnel for L cabs and a cover to provide protection from bulk goods in conjunction with the M cab.
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