THE EXTREME OFF-ROAD UNIMOG.
Made to take virtually every hurdle.
Extreme terrain, extreme weather, extreme tasks. The off-road Unimog - developed as a reliable powerhouse with one goal: making robustness as capable as possible.
Thanks to modern technology, the Unimog series with its U 4023 and U 5023 models, suitable for all-terrain use, can handle practically any challenge. All-wheel drive and extreme torsional flexibility give the robust commercial vehicle a head start in rough terrain: the Unimog takes work teams, material and heavy implements to their place of deployment, no matter how remote.
Advantages at a glance.
- Modern, efficient, large-series proven Mercedes-Benz drive system technology
- All-wheel drive for powerful traction
- Entirely welded frame and encapsulated drivetrain for an extended service life
- Transmission with short shift times
- Off-road ratio for a climbing capability of up to 100%
- Outstandingly torsionally flexible vehicle frame
- Fording capability to a depth of 1.20 m
- and lots more...
THE ALL-TERRAIN UNIMOG AT A GLANCE.
The highly off-road-capable Unimog offers generous levels of comfort through the implementation of many practical functions and modern technology. Find out more about the operating concept, cab or crewcab.
Find out more about chassis, transmission, axles, attachments and bodies.
Areas of application.
Learn more about the application possibilities for the energy industry and agriculture, fire-fighting & rescue, municipal work or as a vehicle for leisure or long journeys.
In this area, we provide you with information on the technical details of all model variants of the highly off-road capable Unimog.
Highlights and other facts.
All-wheel drive and extreme torsional flexibility give this robust commercial vehicle a head start in rough terrain: The Unimog takes work teams, material and heavy implements to their place of deployment, no matter how remote.
The crewcab transforms the Unimog into a people carrier.
If the Unimog is not only to transport as much material as possible to places of work, but also teams of up to 7 persons, the crewcab is a valuable asset. It has an additional four-seater rear bench seat - each seat equipped with its own seat belt and with optimum comfort features. Alternatively, for air-sprung single seats are optionally available. The crewcab makes it easy to get to work sites in full team strength, even in extreme terrain. In addition to sufficient head- and legroom, there is also plenty of stowage space under the fold-down rear bench seat. Tools, equipment and personal belongings can be safely stowed in them and are always at hand. The front-door compartments feature further stowage options. A total of four wide-opening doors - two on each side of the vehicle - also provide ergonomic access to, and exit from, the rear passenger compartment.
Get in, feel good, get going: The cab brings together the result of decade-long vehicle design and construction. It offers a comfortable sitting position in the low-vibration area behind the front axle â€“ a valuable support especially when off-roading. All the settings can be registered quickly in the large instrument cluster. This make a considerable contribution to safety and user-friendliness. This way, work and comfort go hand in hand in the Unimog. Because the faster and more intuitively the driver can operate the many different driving and working functions, the safer and more reliable off-road use will be.
Advantages at a glance.
- Robust steel cab-behind-engine
- Seating position to the rear of the front axle
- Short distance between implement and tractor
- Cab structural integrity in accordance with ECE-R-29/3
- 3-point mounting, vibration-damped
- Tiltable cab
- 2 cab rear wall windows
- 2- or 3-step anti-slip access, with grab handle
- Heated exterior mirrors on both sides, electrically adjustable
- Heat-insulating tinted glass all-round
- Top air intake
- and lots moreâ€¦
The interior offers a high level of comfort and makes work easier. The heating and air conditioning system creates a well-tempered working atmosphere in all weathers. The standard high roof and the adapted engine tunnel allow space for two full single seats and the optional centre seat. The modern workplace also includes a CD radio with Bluetooth hands-free feature. The centre stowage and the standard glove compartment look tidy and allow a clear overview and orderliness.
- The cab is clearly organised and creates a pleasant working atmosphere. The multifunction steering wheel lies perfectly in your hand and provides quick access to the hands-free system and the display of the instrument cluster.
- The instrument cluster shows all the important information such as oil level, air pressure or hydraulic system settings on its large and bright display.
- Functions such as gearshift, premium engine brake and Electronic Quick Reverse are integrated in the steering column stalks.
- Clearly-structured operating elements, all within easy reach. A real innovation for easy operation is the Tirecontrol plus central tyre inflation system. If features practical presets.
- The standard height- and tilt-adjustable steering column enables an optimum seating position for the driver.
Everything within easy reach.
The cab design supports the driver, in particular when the job leaves no room for long deliberation. Ergonomically and intuitively arranged, all elements make operation more convenient. The seating position in the low-vibration area behind the front axle makes off-road driving more comfortable and offers a very good overview of the area of travel.
The highly off-road-capable Unimog is the embodiment of more than 70 years of development experience: Portal axles, all-wheel drive, central tyre inflation system and differential locks on both axles and an extremely torsionally-capable vehicle frame enable the U 4023 and the U 5023 to advance in even the most arduous terrain. For instance thanks to Tirecontrol plus: The preset modes "road", "sand" and "bad road" make the selection of the correct tyre pressure at the touch of a button and easy and automatic.
Takes almost every hurdle.
The engageable all-wheel drive system brings the vehicle steadily forward even on difficult terrain. To prevent any wheel from spinning, differential locks can be engaged. The single-tyre principle is also well thought-out: The rear wheels follow in the tracks made by the front wheels and are thus able to use the firmness of the surface already compacted by them.
The engine has been positioned in a central position under the cab. This results in a balanced axle load distribution, which has a positive effect on vehicle handling. And when the Unimog does have to stop, it does so with the pneumatic braking system with off-road ABS, automatic load-dependent brake force control (ALB) and disc brakes on all four wheels.
Flexible and robust in operation.
At the core of the Unimog U 4023 and Unimog U 5023's all-terrain capabilities is the cranked vehicle frame with welded-in tubular cross members. Thanks to its torsional flexibility in combination with torque tube technology and the 3-point mounting of engine, transmission, cab and body, a diagonal torsion of up to 600 mm is possible. As the frame is completely welded, it possesses great torsional resistance. At the same time the cranked frame makes possible both a low centre of gravity and high ground clearance. The typical Unimog portal axles also ensure this. And the asymmetrical arrangement of the axle differentials makes it easier to override obstacles.
Short frame overhangs at the front and rear result in large approach/departure and ramp breakover angles, so that hardly any steep terrain presents a difficulty for the Unimog. Add to this the following: Water-protected units, the raised air intake tube and ventilation ducts make fording of bodies of water with a depth of up to 800 mm (optionally 1200 mm) possible.
By connecting the axles to the transmission by means of torque tube and thrust ball, an axle articulation of up to 30 degrees is possible. And encapsulation protects the drive shaft against contamination with dust, water and other outside influences when driving off the beaten track.
The highly off-road-capable Unimog is equipped with modern and efficient Mercedes-Benz drive system technology. Tested in large-scale series production, the Euro 6 engine generation sets standards for its class and takes no half-measures where conserving the environment, economic efficiency and top performance are concerned. The 4-cylinder engine with an output of 170 kW is particularly maintenance-friendly, economical, smooth-running and powerful. It is characterised by its high torque of up to 900 Nm as well as good figures for exhaust emissions, consumption and power-to-weight ratio. 4-valve technology and common rail injection up to 2400 bar further increase efficiency.
Perfectly coordinated drive system technology.
However, the engine is not only used for propulsion but also for braking: The two-stage decompression engine brake reduces mechanical wear and tear and makes a great contribution to economic efficiency. The exhaust gas aftertreatment system uses BlueTec 6 technology which has already proven its worth in daily use over many millions of kilometres in our heavy-duty mass-production engines. In the exhaust gas aftertreatment unit, the SCR catalytic converter reduces the nitrogen oxides to a minimum. And the diesel particulate filter prevents almost any soot particles from escaping.
In the Unimog, the fully synchronised electro-pneumatic transmission (EPS) with its eight forward and six reverse gears provides the tractive power. A special off-road group is also available with an additional eight forward and eight reverse gears each for low driving speeds. It is characterised by particularly smooth running, a long service life and great efficiency. And with the synchronised Electronic Quick Reverse group, quick changes in the direction of travel are possible, e.g. for rocking free on rough terrain.
More is more.
The Unimog ensures for itself the full range of possible applications not least through its well-proven transmission power take-offs - for example a fast one for hydraulic pumps and a very fast one for fire brigade pumps. Thanks to an optimised floor assembly, the transmission power take-offs are excellently accessible and are highly versatile.
With the rear-axle drive system for the road and the pneumatically engageable all-wheel drive for off-road use, you have maximum traction in every situation. And when the going gets really tough, differential locks on both axles ensure full power transmission. This way you can be sure to be able to move forward even if only one wheel has sufficient traction. This enables the Unimog to tackle gradients of up to 100%.
Shift gears at your pleasure.
Two drive programs help reduce the driver's workload: in automatic mode "A" - whilst taking into account the load, accelerator position, engine operation, climbs/inclines and the engine brake - the drive program handles gear changes and clutch operation entirely. However, if it becomes necessary for the driver to manually change gear using the multifunction lever, this is also possible.
Complete control is offered by the "M" drive program (manual). Here, gear selection is also made using the multifunction lever. The driver determines the gear and clutch operation occurs automatically.
Versatile applicability is the trademark of the Unimog. Its reinforced portal axles with hub reduction gear guarantee high ground clearance for the most diverse of tasks - even off the beaten track.
To this end, the differential and the drive shafts connected with it are repositioned higher up. Axle tube and differential lie above the wheel centre. In this way, obstacles are easier to overcome and the vehicle's centre of gravity remains low.
Its axle suspension is reinforced and can withstand the greatest loads. The axle design is also of great robustness: It makes great standard load capacities possible.
No-one is yet to replicate the Unimog in this domain: setting the right tyre pressure for the task at hand is conveniently carried out at the push of a button on the display. The driver has the choice between the three pre-configured modes "Road", "Sand", "Rough" and "Manual". The tyre pressure is then automatically adjusted. Thus, the Unimog can be driven with low tyre pressure on loose ground such as sand or mud and hence has a greater tyre contact area. That leads to better traction and less slipping. Or economical and safe driving on-road thanks to a high tyre pressure and smaller tyre contact area.
The Tirecontrol plus central tyre inflation system is available ex factory and no special conversions are necessary.