Mercedes-Benz has introduced the new Zetros truck, a remarkable vehicle suitable for many of the toughest applications, including open-pit mining and logistics in rough terrain. The optional Allison six-speed fully automatic transmission 3000 Series, available with integral retarder, delivers optimal driving comfort and unbeatable reliability under the most difficult conditions for the off-road vehicle.

The Zetros 2733, for example, is in 6×6 axle configuration (six wheels, with all six being driven). The design of the Mercedes-Benz Zetros offers:

• Permanent all-wheel drive with two-stage transfer case and off-road gear ratio of 1:1.69 to increase tractive power under extreme conditions.
• Reinforced frame with open C-profile longitudinal members and screwed C-profile cross members with inside reinforcements for the highest load capacity. Highly stable front end of frame for mounting front implements and also for lifting the vehicle. High flexibility for individual bodies.
• Single tyres for additional traction benefits, since the rear wheels follow in the tracks of the front wheels. High ground clearance thanks to 14.00 R 20-size tyres.

Positioning the cab behind the front axle has resulted in a number of significant advantages for the driver of this cab-behind-engine truck due to its design: the favourable and even weight distribution provides smooth handling over difficult terrain, and driver comfort is also significantly enhanced.

Low centre of gravity, balanced weight distribution Thanks to its cab being located behind the engine, the Zetros benefits from a low centre of gravity and a balanced weight distribution over the axles. As a result it is possible to mount large implements on the front of the vehicle, such as a snowplough for example. This is where the Zetros 6×6 has a clear advantage as a cab-behind-engine vehicle compared with a cab-over-engine truck, which for such uses would have to be configured as an 8×8 vehicle. In addition, driving in difficult terrain is easier and more comfortable thanks to its low centre of gravity. The engine can also be accessed without tilting the cab, and due to its low design long items of equipment can extend over the cab. The Zetros is equipped with a powerful 240 kW  inline six-cylinder diesel engine which produces 1300 Nm of torque, ample for every situation.

The four-wheel drive Zetros is now available as a two-axle vehicle with a gross vehicle weight of 16.5 or 18.0 t and a payload (excluding body) of 10 t, as well as a three-axle vehicle with a maximum of 25.0 or 27.0 t and a payload of 16 t. All versions have a large-scale 7.2-litre in-line six-cylinder OM 926 LA Euro 5 engine, capable of producing 240 kW and a maximum torque of 1300 Nm between 1,200 and 1,600 rpm.

The focus of the Mercedes-Benz Zetros is to offer the best possible mode of transport under the most challenging off-road conditions. For almost 60 years Allison Transmission has specialised in providing high quality, reliable and durable transmissions for the toughest and most critical environments under which it is trusted to maintain productivity and performance.

The Allison torque converter multiplies engine torque at vehicle launch and allows a smooth and gradual delivery to the drive wheels. “The torque converter, extending the ratio coverage and delivering the maximum engine torque possible, makes sure that the Zetros can easily keep the vehicle moving even in challenging terrain or sandy ground conditions,” says Manlio Alvaro, Allison Marketing Manager for European Operations. “This is critical for customers demanding the highest productivity.”

Furthermore, the hydraulic Allison torque converter – which is not a wear component – provides a direct connection between engine and transmission in place of a traditional dry-plate clutch used by a manual or AMT. In severe duty cycles, the torque converter not only has a very positive impact on the transmission durability, but its ‘cushion effect’ protects the whole driveline against shocks and wear.