Robur LO 1801 A

The Robur LO 1801 A is a forward control off-road truck, made by East German manufacturer VEB Robur-Werke Zittau. It was produced from 1965 to 1973, alongside the on-road model LO 2501. Unlike the on-road model, the LO 1801 A has all-wheel drive, which came at the cost of a reduced payload. LO 1801 A is an abbreviation for air-cooled otto, 1800 kg payload, all-wheel drive.

LO 1801 A
LO 1801 A fire engine
Overview
TypeTruck
ManufacturerVEB Robur-Werke Zittau
Production1965–1973
AssemblyEast Germany: Zittau
Body and chassis
Class1.8 t truck
Body styleForward control truck
LayoutFront engine, all-wheel-drive
PlatformRobur
RelatedLO 2501 / LD 2501
Powertrain
EngineLO 4/1 (Otto, 3345 cm3, 51.5 kW)
TransmissionManual five-speed synchromesh gearbox and two-speed splitter gearbox;
10 forward, 2 reverse gears
PropulsionTyres
Dimensions
Wheelbase3025 mm
Length5350 mm
Width2370 mm
Height2530 mm[1]
Kerb weight3200 kg[2]
Chronology
PredecessorRobur LO 1800 A
SuccessorRobur LO 2002 A

Like its predecessors, the LO 1801 A was used by the East German military, police, fire brigade, and open pit mining rescue service. Export versions were called Safari.[3]

Technical description

The LO 1801 A is a light, 1.8 tonne, two-axle, all-wheel-drive, body-on-frame, forward control truck with single tyres.

The frame has two U-section longitudinal members, as well as four tube, and two square-shaped crossmembers. It comes with only few grease nipples.[4] Both front and rear axles are leaf sprung rigid live axles, only the front axle has hydraulic shock absorbers. Differentials with a reduction of 6:35 were installed.[5] The steering system is a worm-and-lever steering system.[4] All four wheels come with 9.00—20 inch rims, 10—20 inch extra tyres,[6] and drum brakes. Robur installed a dual-circuit braking system.[4] The cab is made of steel, has front-hinged doors, a split windscreen, and split A-pillars with narrow windows for improved visibility. Unlike the LO 2501, which only seats three, the Robur LO 1801 A seats four.[6]

The gearbox is a manual, five-speed, dog-leg[7] gearbox with synchromesh and helical gearing in gears 2–5. First and reverse are straight cut gears without synchromesh.[8] The splitter gearbox is an unsynchronised, three-shaft gearbox with gearshift sleeves. It has an on-road gear, an off-road gear, and an additional gear for switching front-wheel drive.[9] A dry diaphragm-spring single-disc clutch, type T20K/DZ, transmits the torque from the engine to the gearbox.[10] The LO 1801 A is powered by an air-cooled, straight-four, OHV, carburetted LO 4/1 otto engine. It displaces 3.3 litres, and is rated 70 PS (51.5 kW).[11]

Technical specifications
Technical specifications
Robur LO 1801 A
Engine
Engine type LO 4/1
4 VO 11,8/9,5-1 SRL
Operating principle and layout Straight-four, air-cooled, four-stroke, OHV otto engine
with downdraught carburetter and battery ignition system
Bore × Stroke,
Displacement		 95 × 118 mm,
3345 cm3
Rated power (TGL 8346) 70 PS (51.5 kW) at 2800 min−1
Max. torque 22 kp⋅m (215.7 N⋅m) at 1800 min−1
Fuel type VK 79 (leaded petrol, 79 RON)[1]
Specific fuel consumption 250 g/kWh
Source, unless otherwise stated [11][12]
Powertrain
Layout Front engine, all-wheel drive
Differential locks No differential locks;
engaging front wheel drive automatically locks front and rear axle
(due to lack of a centre differential)
Tyres 4× 10—20″ extra single tyres[6]
Clutch T20K/DZ single-disc dry clutch[10]
Gearbox Five-speed[8] + two-speed splitter[9]
PTO Available as a factory option
Measurements
Length 5350 mm
Width 2370 mm
Height 2530 mm
Wheelbase 3025 mm
Track width front: 1636 mm
rear: 1664 mm
Overhang front: 1200 mm
rear: 1165 mm
Turning circle 14,900 mm
Ground clearance 265 mm
Fording depth 800 mm
Slope angle front: 36 °
rear: 35 °
Mass 3200 kg
Payload 1800 kg
GVW 5000 kg
Fuel tank 90+35 l
Fuel consumption 26 l/100 km (fully laden)
Source, unless otherwise stated [1][2]
Electrical system
Generator DC generator, 41.7 A, 12 V, 0.5 kW[13]
Battery 1 × Lead-acid battery, 12 V, 105 Ah[6]
Starter 12 V, 1.3 kW[14]
Speed ranges and gradeability
Gear Speed at 2800/min (on-road gear) Speed at 2800/min (off-road gear) Gradeability at 1700/min (off-road gear)
1st 10 km/h 6 km/h 82 %
2nd 17 km/h 9 km/h 40 %
3rd 27 km/h 15 km/h 23 %
4th 48 km/h 26 km/h 13 %
5th 80 km/h 45 km/h 8 %
Source [15]

References
  1. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für die Fahrgestelle der Lastkraftwagen LO 2501 / LD 2501 / LO 1801 A, VEB Fachbuchverlag, Leipzig 1966, p. 14 (in German)
  2. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für die Fahrgestelle der Lastkraftwagen LO 2501 / LD 2501 / LO 1801 A, VEB Fachbuchverlag, Leipzig 1966, p. 15 (in German)
  3. Oswald, Werner (ed.): Kraftfahrzeuge der DDR, (2nd ed.), Motorbuch-Verlag, Stuttgart 2000, ISBN 3-613-01913-2, p. 230 (in German)
  4. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für die Fahrgestelle der Lastkraftwagen LO 2501 / LD 2501 / LO 1801 A, VEB Fachbuchverlag, Leipzig 1966, p. 10 (in German)
  5. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für die Fahrgestelle der Lastkraftwagen LO 2501 / LD 2501 / LO 1801 A, VEB Fachbuchverlag, Leipzig 1966, p. 9 (in German)
  6. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für die Fahrgestelle der Lastkraftwagen LO 2501 / LD 2501 / LO 1801 A, VEB Fachbuchverlag, Leipzig 1966, p. 11 (in German)
  7. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für die Fahrgestelle der Lastkraftwagen LO 2501 / LD 2501 / LO 1801 A, VEB Fachbuchverlag, Leipzig 1966, p. 16 (in German)
  8. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für die Fahrgestelle der Lastkraftwagen LO 2501 / LD 2501 / LO 1801 A, VEB Fachbuchverlag, Leipzig 1966, p. 7 (in German)
  9. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für die Fahrgestelle der Lastkraftwagen LO 2501 / LD 2501 / LO 1801 A, VEB Fachbuchverlag, Leipzig 1966, p. 8 (in German)
  10. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für den Motor Typ LO 4/1 für Fahrzeugtyp LO 2501 und LO 1801 A, VEB Fachbuchverlag, Leipzig 1967, p. 63 (in German)
  11. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für den Motor Typ LO 4/1 für Fahrzeugtyp LO 2501 und LO 1801 A, VEB Fachbuchverlag, Leipzig 1967, p. 8 (in German)
  12. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für den Motor Typ LO 4/1 für Fahrzeugtyp LO 2501 und LO 1801 A, VEB Fachbuchverlag, Leipzig 1967, p. 9 (in German)
  13. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für den Motor Typ LO 4/1 für Fahrzeugtyp LO 2501 und LO 1801 A, VEB Fachbuchverlag, Leipzig 1967, p. 57 (in German)
  14. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für den Motor Typ LO 4/1 für Fahrzeugtyp LO 2501 und LO 1801 A, VEB Fachbuchverlag, Leipzig 1967, p. 60 (in German)
  15. VEB Robur-Werke Zittau (ed.): Reparaturhandbuch für die Fahrgestelle der Lastkraftwagen LO 2501 / LD 2501 / LO 1801 A, VEB Fachbuchverlag, Leipzig 1966, p. 12 (in German)
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