The extreme off-road Unimog.

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Technical data.

Model overview

Technical data at a glance.

Ouput.

Model U 4023 U 4023
Crew cab
U 5023 U 5023
Crew cab
Engine OM 934 OM 934 OM 934 OM 934
Max. output in accordance with DIN (kW) 170 170 170 170
Max. ouput (HP) 231 231 231 231
Cylinders 4, upright in-line 4, upright in-line 4, upright in-line 4, upright in-line
Max. Torque (Nm) 900 900 900 900
Displacement (cm³) 5,132 5,132 5,132 5,132

Dimensions.*

Model U 4023 U 4023
Crew cab
U 5023 U 5023
Crew cab
Wheelbase (mm) 3,850 3,850 3,850 3,850
Vehicle height (mm) 2,797 2,797 2,873 2,873
Vehicle width (mm) 2,480 2,480 2,480 2,480
Vehicle length (mm) 6,000 6,000 6,000 6,000
Body space (mm) 4,100 x 2,280 x 1,400 3,100 x 2,280 x 1,400 4,100 x 2,280 x 1,400 3,100 x 2,280 x 1,400
Turning circle (∅ mm) 16,300 16,300 16,400 16,400
Fording capability (standard/OE mm) 800 /1,200 800 /1,200 800 /1,200 800 /1,200

* Figures depend on load and tyres

Weights:

Model U 4023 U 4023
Crew cab
U 5023 U 5023
Crew cab
Perm. max. total weight (with corresponding special equipment) (t) 7.5/8.0**/10.3 7.5/8.0**/10.3 12.5/13.0**/14.5 12.5/13.0**/14.5
Permissible axle loads        
Weight on front axle (t) 4.1/4.1**/4.6 4.1/4.1**/4.6 5.5/5.7**/6.4 5.5/5.7**/6.4
Weight on RA (t) 4.6/4.6**/6.0 4.6/4.6**/6.0 7.1/7.9**/8.8 7.1/7.9**/8.8

**Standard

Standard tyres.

Model U 4023 U 4023
Crew cab
U 5023 U 5023
Crew cab
Smallest tyres (tyres/rims) 335/80 R20 335/80 R20 365/80 R20 365/80 R20
Largest tyres (tyres/rims) 425/75 R20 405/70 R24 425/75 R20 405/70 R24 455/70 R24 455/70 R24

Type details

Your model up close.

Type U 4023
Engine (Euro VIe) OM 934 LA
Output kW/hp 170/231
Torque at rated speed (rpm) 900 Nm/1400
Clutch SAE-2 Ø395 mm single disc dry clutch (organic)
Transmission UG 100/8
Axles Sliding tube-guided portal axles with coil springs
Front axle (model variant) 737.367
Rear axle (model variant) 737.367
Electrical system (V) 24
Battery capacity (standard/optional in Ah) 100/170
Tank capacity Rated
Steering volume with max. steering pressure (bar) ZF 8095 / 170
Brakes Pneumatic disc brakes
Smallest tyres (tyres/rims) 335/80 R20
Largest tyres (tyres/rims) 425/75 R20 and 405/70 R24
Drive type Engageable all-wheel drive
Wheelbase (mm) 3850
Max. pressure rating Total weight (with special equipment in t) 10.3
Max. weight on front axle (t) 4.6
Max. weight on rear axle (t) 6.0
Angle of approach/departure 41°/39°
Turning circle (m) 16.3
Mounting space (max. L × W × H in mm) 4100 × 2280 × 1400
Fording depth (standard/optional in m) 0.8 /1.2
Speed (km/h) 89 (statutory top speed)

The vehicle is shown with Euro VIe and compressed springs Not all equipment shown can be installed together. We reserve the right to make changes and implement facelifts.

Type U 4023
Engine (Euro VIe) OM 934 LA
Output kW/hp 170/231
Torque at rated speed (rpm) 900 Nm/1400
Clutch SAE-2 Ø395 mm single disc dry clutch (organic)
Transmission UG 100/8
Axles Sliding tube-guided portal axles with coil springs
Front axle (model variant) 737.367
Rear axle (model variant) 737.367
Electrical system (V) 24
Battery capacity (standard/optional in Ah) 100/170
Tank capacity Rated
Steering volume with max. steering pressure (bar) ZF 8095 / 170
Brakes Pneumatic disc brakes
Smallest tyres (tyres/rims) 335/80 R20
Largest tyres (tyres/rims) 425/75 R20 and 405/70 R24
Drive type Engageable all-wheel drive
Wheelbase (mm) 3850
Max. pressure rating Total weight (with special equipment in t) 10.3
Max. weight on front axle (t) 4.6
Max. weight on rear axle (t) 6.0
Angle of approach/departure 41°/39°
Turning circle (m) 16.3
Mounting space (max. L × W × H in mm) 4100 × 2280 × 1400
Fording depth (standard/optional in m) 0.8 /1.2
Speed (km/h) 89 (statutory top speed)

The vehicle is shown with Euro VIe and compressed springs Not all equipment shown can be installed together. We reserve the right to make changes and implement facelifts.

Type U 5023
Engine (Euro VIe) OM 934 LA
Output kW/hp 170/231
Torque at rated speed (rpm) 900 Nm/1400
Clutch SAE-2 Ø395 mm single disc dry clutch (organic)
Transmission UG 100/8
Axles Sliding tube-guided portal axles with coil springs
Front axle (model variant) 737.223
Rear axle (model variant) 737.223
Electrical system (V) 24
Battery capacity (standard/optional in Ah) 100/170
Tank capacity Rated
Steering volume with max. steering pressure (bar) ZF 8095 / 170
Brakes Pneumatic disc brakes
Smallest tyres (tyres/rims) 365/80 R20
Largest tyres (tyres/rims) 455/70 R24
Drive type Engageable all-wheel drive
Wheelbase (mm) 3850
Max. pressure rating Total weight (with special equipment in t) 14.5
Max. weight on front axle (t) 6.4
Max. weight on rear axle (t) 8.8
Angle of approach/departure front/rear 43°/41°
Turning circle (m) 16.4
Mounting space (max. L × W × H in mm) 4100 × 2280 × 1400
Fording depth (standard/optional in m) 0.8/1.2
Speed (km/h) 89

The vehicle is shown with Euro VIe and compressed springs Not all equipment shown can be installed together. We reserve the right to make changes and implement facelifts.

Type U 5023
Engine (Euro VIe) OM 934 LA
Output kW/hp 170/231
Torque at rated speed (rpm) 900 Nm/1400
Clutch SAE-2 Ø395 mm single disc dry clutch (organic)
Transmission UG 100/8
Axles Sliding tube-guided portal axles with coil springs
Front axle (model variant) 737.223
Rear axle (model variant) 737.223
Electrical system (V) 24
Battery capacity (standard/optional in Ah) 100/170
Tank capacity Rated
Steering volume with max. steering pressure (bar) ZF 8095 / 170
Brakes Pneumatic disc brakes
Smallest tyres (tyres/rims) 365/80 R20
Largest tyres (tyres/rims) 455/70 R24
Drive type Engageable all-wheel drive
Wheelbase (mm) 3850
Max. pressure rating Total weight (with special equipment in t) 14.5
Max. weight on front axle (t) 6.4
Max. weight on rear axle (t) 8.8
Angle of approach/departure front/rear 43°/41°
Turning circle (m) 16.4
Mounting space (max. L × W × H in mm) 4100 × 2280 × 1400
Fording depth (standard/optional in m) 0.8/1.2
Speed (km/h) 89

The vehicle is shown with Euro VIe and compressed springs Not all equipment shown can be installed together. We reserve the right to make changes and implement facelifts.

Equipment

The Unimog has on board:

Equipment

Cab.

Exterior.

The robust cab of the extreme off-road Unimog provides a good view of what is in front of the vehicle thanks to its short distance between implement and tractor of 1,050 mm. Crew cab is available as an option.

As standard.

  • Steel short-bonnet cab
  • 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-step anti-slip access, with grab handle
  • Heated exterior mirror on both sides, electrically adjustable
  • Wide-angle mirror, heated
  • Kerb mirror
  • Heat-insulating tinted glass all round
  • High air intake
  • Multi-stage windscreen wipers, with intermittent setting

Optional equipment.

  • Monitor for front and rear-view camera
  • Camera system
  • Crew cab for up to 7 persons
  • Manual/hydraulic cab tilting mechanism
  • Heated windscreen
  • Roof hatch, round, swivel-type
  • 3-step anti-slip access, with grab handle
  • Electric windows
  • Central locking system

3-step access

Crew cab

Interior.

The interior of the extreme off-road Unimog offers plenty of stowage space and ensures comfortable operation of the vehicle with a host of extras.

As standard.

  • Multifunction steering wheel
  • Steering column adjustable for height and tilt
  • Heating and ventilation system with pollen filter
  • Residual heat use
  • Storage compartments and trays
  • Roof console with 2 installation slots for radio/tachograph
  • 3 sun blinds
  • Centre console with main controls and 2 installation slots
  • Instrument cluster, 10.4 cm
  • On-board diagnostics
  • Multifunction lever on the right for driving mode
  • Seats with tapered backrests and integrated headrest with integrated 3-point safety belts
  • Driver’s and co-driver’s seat height, fore-and-aft and angle adjustable, backrest adjustable 
  • Air-sprung suspension seat for driver
  • Door linings with armrest and bottle holder
  • Interior lights with reading lamps for both driver and co-drivers
  • 3 clothes hooks
  • Vehicle tool kit
  • Cab floor with cross-cab access

Optional equipment.

  • Air-sprung suspension seats for co-drivers
  • Middle seat, with head restraint and 3-point seat belt
  • Seat heating for driver and co-drivers
  • Seat covers in artificial leather
  • Integrated air conditioning
  • Auxiliary heater
  • Reading lamp
  • Instrument cluster with colour display, 12.4 cm diagonal
  • High storage box with folding table
  • DAB-radio with Bluetooth

Steering column adjustable for height and tilt

Multifunction lever

Equipment

Engine.

The extreme off-road Unimog has powerful diesel engines that are also particularly robust and low-maintenance.

As standard.

  • Modern Mercedes-Benz engine generation that meets the Euro VIe emissions standard
  • Diesel direct injection with  turbocharger/intercooler
  • Dual regulation (driving/operating equipment modes)
  • Manual throttle, electronic
  • Mechanical fan drive
  • Powerful premium engine brake
  • Air compressor 430 l/min
  • Air dryer, heated
  • Air filter, prefilter
  • Cold engine start as low as -15°C
  • Long maintenance intervals (1,400 operating hours/35,000 km)


Exhaust gas after treatment:

  • Diesel particulate filter
  • SCR catalytic converter


Powerful premium engine brake:

  • 2-stage decompression brake
  • Max. braking power: 178 kW (OM 934)
  • Operated with steering column control stalk

Optional equipment.

  • Engine power take-off
  • Engine pre-heating
  • Fuel preheating
  • Cold climate package (down to -26 °C)
  • Raised exhaust pipe on the right-hand  side of the vehicle to the cab roof

Speed [rpm], torque [Nm], engine output [kW]

U 4023/U 5023 engine data.

Engine model OM 934 LA
Output in accordance with DIN (kW/hp) 170/231
Number of cylinders, arrangement 4 in-line
Operating principle 4-stroke diesel direct injection
Total displacement (cm³) 5,132
Injection pressure (bar) Up to 2,400
Compression ratio 17.6:1
Model variant 934.974
Max. torque (Nm) 900
Rated speed [rpm] 2.200
Fan drive Mechanical
Fuel tank/enlarged [l] 160/240
AdBlue tank [l] 18

Equipment

Transmissions.

The transmission of the Unimog is the basis for its reputation as a legendary off-road professional. Optionally, it can be extended by an off-road gear range with 8 additional forward and reverse gears.

As standard.

  • Fully synchronised Mercedes-Benz forwards-reverse gear unit with 8 forwards and 6 reverse gears
  • Single-disc dry clutch, self-adjusting
  • Rear-wheel drive with pneumatically  engageable all-wheel drive
  • Cruise control/Temposet
  • Top speed limiter 89 km/h
  • Electropneumatic power shift (EPS)
  • EQR (Electronic Quick Reverse)

Optional equipment.

  • Automatic transmission (EAS)
  • Off-road group with 8 additional forward and reverse gears
  • Transmission PTO

Road speeds and gear ratios.

  U 4023               U 5023              
Gears 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
Gear ratio forward 9.570 6.635 4.375 3.219 2.188 1.517 1.000 0.736 9.570 6.635 4.375 3.219 2.188 1.517 1.000 0.736
Reverse gear ratio 14.569 10.101 6.660 4.900 3.330 2.309 1.522 1.120 14.569 10.101 6.660 4.900 3.330 2.309 1.522 1.120
Driving speed, basic gears, forwards 6.6 9.6 14.5 19.7 29.0 41.9 63.5 86.3 6.9 9.9 15.0 20.4 30.1 43.4 65.8 89.4
Driving-speed, basic gears, reverse 4.4 6.3 9.5 13.0 19.1 27.5 4.5 6.5 9.9 13.4 19.8 28.5 43.2 58.8
Off-road gears (x 3.19), forwards 2.1 3.0 4.6 6.2 9.1 13.1 19.9 27.1 2.2 3.1 4.7 6.4 9.4 13.6 20.6 28.1
Off-road gears (x 3.19), reverse 1.4 2.0 3.0 4.1 6.0 8.6 13.1 17.8 1.4 2.0 3.1 4.2 6.2 8.9 13.6 18.4

Equipment

Brakes.

The brakes of the extreme off-road Unimog are specially designed for reliable operation in demanding terrain.

As standard.

  • Premium engine brake, 2-stage
  • Pneumatic high-pressure brake system (13 bar)
  • Pneumatic disc brakes on all four wheels
  • Spring-loaded parking brake on rear axle
  • 4-channel off-road ABS, can be switched on for off-road driving
  • Electronic load-dependent brake force control (EBLF control)
  • Compressed air connection for auxiliary consumers
  • Brake pad wear indicator

Optional equipment.

  • Holding brake on front axle
  • Pipe rupture protection for brake system
  • Hill holder

Disc brakes on all four wheels offer off-road safety, even with heavy vehicle bodies.

Equipment

Steering.

The hydraulic power steering ensures full control during off-road operations.

As standard.

  • Hydraulic power steering
  • Steering column adjustable in height and angle
  • Multifunction steering wheel

Optional equipment.

  • Right-hand drive

Equipment

Wheels and axles.

The robust frame of the extreme off-road Unimog in sliding tube technology and the proven portal axles get the crew to their destination even in rough terrain.

As standard.

  • Heavy-duty, torsionally flexible frame construction
  • Offset, robust welded frame
  • Two U-profile longitudinal frame members with welded tubular cross members and reinforcements in the frame profile
  • Frame implement fittings, centre
  • Towing attachment with locking pins at the front
  • Coil springs with progressive load recognition
  • 3-point suspension for torsion-free mounting of engine, transmission and cab
  • Fording depth of up to 800 mm
  • Chassis preservation
  • Stabilisers at front and rear
  • Telescopic shock absorbers
  • Portal axles
  • Axles with sliding tube guide and transverse control arm
  • Differential lock on the front axle, engageable
  • Differential lock on the rear axle, engageable
  • All locks are engageable and disengageable electropneumatically using the claw clutch while driving (100% locking effect)
  • Double seal for wheel hub, for mud inserts (U 5023 only)

Optional equipment.

  • Fording depth of up to 1,200 mm
  • Low pressure tyres with MPT/AS treads
  • TireControl plus tyre pressure control system for adjusting the tyre pressure to on-road/off-road conditions
  • Front mounting plate
  • Floor assembly with double torsionally flexible 3-point mounting
  • Mounting brackets for cable winches
  • Mounting brackets for heavy bodies (e.g. crane) and component layout on the frame side for support feet
  • Body mounting parts for torsionally flexible body mounting
  • Lashing and securing eyelets
  • Heat protection package for fire service vehicles

Portal axles with final reduction gear: great ground clearance but at the same time a low vehicle centre of gravity as axle tube and differential are located above the centre of the wheel and the differential is not in the centre of the axle.

Final cross member for increased towing capacity

Equipment

Tyres.

Thanks to the optional TireControl plus tyre pressure control system, the extreme off-road Unimog can be optimally adjusted to the terrain ahead – simply at the touch of a button.

Standard tyres.

  • U 4023 335/80 R 20
  • U 5023 365/85 R 20

Optional equipment.

  • Low pressure tyres with MPT/AS treads
  • TireControl plus tyre pressure control system for adjusting the tyre pressure to on-road/off-road conditions

TireControl plus.

With its TireControl plus tyre pressure control system for fast switching between on and off-road driving, when it comes to off-road use, this Unimog is an absolute must. The tyre pressure can be set quickly and easily using the steering wheel buttons via preselection on the display. The test and filling valve on the tyre is protected by a hub cap.

On the road, a high tyre pressure ensures a low contact area, so there is less wear on the tyre and fuel consumption is reduced. In addition, the load-bearing capacity is increased at  high speeds, enabling a high level of directional and steering stability for the Unimog. Off-road, on the other hand, low tyre pressure is recommended, which ensures high traction and less slippage. The low ground pressure resulting from the large contact area also prevents crop damage and excessive group compaction – an advantage when used on agricultural land. The tread of the tyre also achieves better self-cleaning thanks to low pressure and effectively prevents the Unimog from becoming stuck.

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Equipment

Electrics.

The powerful 24 V on-board electrical system of the Unimog offers numerous connection and lighting options.

As standard.

  • 24 V vehicle power supply
  • Electronics compartment protected in cab, with socket for diagnostics
  • Socket with permanent power supply 24 V/15 A
  • CAN bus network
  • Trailer socket, rear, 15-pin /24 V
  • 100 Ah batteries
  • Electronic vehicle management system
  • EMC-tested
  • 28 V/100 A alternator
  • Rain sensor
  • Automatic driving lights, headlamps protected in the bumper
  • Daytime running lamps
  • Headlight range adjustment
  • Rear fog lamp
  • Reversing lamps
  • End-outline marker lamps

Optional equipment.

  • Stronger alternator 28 V/150 A
  • Alternator protected against dirt and suitable for fording
  • Work lamp directed to the rear
  • Lamp protection grille
  • 170 Ah battery
  • Main battery switch, electronic on request
  • 12V/15A continuous current socket with C3 signal
  • External starter socket
  • Parameterisable configurable special module and 32-pin device socket

Front headlights  protected in the bumper

Rear lamps

24 V power socket in cab

Equipment

Implement drive.

The extreme off-road Unimog can be optionally equipped with hydraulics and power take-offs for a wide range of applications.

Working hydraulics.

Equipment
System pressure [bar] 240
Delivery volumes at 2,200 rpm engine speed [l/min] 50
Controller Pressure build-up valve with switch in cab
Connections 2 sockets at the front, on the left above the bumper in the direction of travel, pressure line as plug, return line as sleeve

Engine power take-off.

Equipment
Model Driven by the engine via spur gear in the engine, flange drive at the rear of the engine via engageable dog clutch, engageable when the engine is at a standstill
Ratio i = 0.933
Direction of rotation Right (in direction of travel)
Maximum torque 600 Nm
Maximum continuous output 138 kW

Transmission power take-off.

Equipment    
Gear ratio 1.0 1.0 0.61
Direction of rotation (in direction of travel) Left-hand Left-hand Right-hand
Maximum torque [Nm] 650 650 320
Maximum power [kW] 150 150 120
rpm at engine speed 2200 rpm 2,200 2,200 3,606
Connection 6-hole flange 4-hole connection 6-hole flange