MB Trac / Unimog

The 1974 U 120 was the first model of the new generation, and different size classes gradually transitioned to the new series. The series was largely technically identical to the MB Trac. In 1976, the model designations were changed to longer ones. The U 600-1100 models were largely similar to the earlier U 52-100 models. Completely new were the U 1300-1700 models. These models had separate Agrar parallel models with a short wheelbase designed for agricultural use.

The U 1300 and U 1500 were replaced in the late 1980s by the U 1400 (136 hp) and U 1600 (156 hp) models, which had a shorter 265 cm wheelbase, while the 281 cm wheelbase remained only in the U 1700 model. At this stage, options were added such as the Unicomp 1 onboard computer and the EFR hydro-tronic electrically operated lift device for both front and rear.

Characteristic features of the Unimog were the 4 equally sized driving wheels, suspended front and rear axles, and dry disc brakes with air pressure assistance. A three-point hitch was available for both front and rear, with power take-offs at the front, rear, and center.

In 1992, the 90-140 horsepower models were renewed, and the flagship U 2400 was introduced. In 2000, the new Unimog series U 300, U 400, and U 500 were introduced, which were later complemented by the 1000 series models.

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Tractors

Unimog U 1000 – U 1500 Agrar

The 6-cylinder U 84 introduced in 1971 was renamed U 900 in 1977. At the same time, the U 66 introduced in the late '60s became the U 800, and the U 52 became the U 600. These models were available with both a fabric roof and a hard roof.

Distinctive features of the Unimog included 4 equally sized driving wheels, suspended front and rear axles, and dry disc brakes with air pressure assistance. A three-point hitch was available both at the front and rear, and power take-offs were available at the front, rear, and center. In the final phase, after the U 800 was discontinued, the U 600 was also available in a 72-horsepower Comprex turbocharged version.

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Unimog U 600 – U 900 Agrar

The serial production of the Unimog began in 1948, and in the early years, Unimogs were mainly delivered to the armies of various countries. Soon, the possibilities in agriculture were also recognized. A highlight in Unimog's agricultural history is the mention of it being the first tractor equipped with a fully synchronized gearbox in 1959.

In 1966, a new, wider Unimog series was introduced, which included the models U 34, U 40, U 54, U 70, and U 80. Two years later, the U 45, U 66, and U 90 models were introduced. The range was gradually expanded upwards: in 1969, 100 hp was reached; in 1972, 110 hp; in 1974, 120 hp; and in 1975 already 150 hp.

Distinctive features of the Unimog were its four equally sized driving wheels, suspended front and rear axles, and dry disc brakes with pneumatic assistance. A three-point hitch was available at the front and rear, and power take-offs were available at the front, rear, and center.

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Unimog U 34 – U 84 Agrar

In the spring of 1987, a renewed model series was introduced. At the same time, production was transferred to the company Trac-technik. The most important difference in the updated models compared to the previous ones was the new, larger displacement engines. The large model series lineup now included the 1300, 1400, and 1600, all of which were turbocharged. A noticeable visual difference in the large series was the vertically slatted grille. Improvements were made also in, among other things, the hydraulics and gear ratio design. The transmission was also stronger than before. As an optional feature, an electronic draft force sensor was now available, which improved the tractor's usability in agriculture.

In the summer of 1990, the top model of the lineup, the intercooler-equipped 1800 (180 hp), was introduced. Unlike the other models, it was available in different colors from MB's truck color palette. There have been issues with the durability of the transmission. The transmission requires smooth shifting and the correct oils.

Production of the MB-trac ended unprofitably at the end of 1991 after approximately 41,000 units had been produced. In the late 1990s, LandTechnik Schönebeck still attempted for a short time to continue production of the 160-horsepower Trac. Doppstadt's Trac models have also been technically very close to the MB-trac.

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MB-trac 1300-1800

The MB tractors received new engines and many small improvements in the spring of 1987. The new model lineup included a more powerful 6-cylinder 1100 (110 hp). At the same time, production was transferred to Trac-technik, a company jointly owned by Daimler-Benz and Deutz-Fahr. Manufacturing ended at the end of 1991.

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MB-trac 700-1100

The first MB-trac was fairly low-powered, but the concept’s suitability for heavier-duty applications was soon recognized. In spring 1976, the 6-cylinder MB-trac 1100 and 1300 Turbo were introduced. In summer 1980, the top of the range was launched with the MB-trac 1500, which at the time was the only model imported into Finland. These models were fundamentally similar in construction to the smaller versions but were more robust in every respect. The brakes were air-operated drum brakes. The steering console could be made to swivel 210 degrees, allowing the tractor to be driven equally well in either direction.

The 30 km/h model had 12 forward and 12 reverse gears, while the 40 km/h version had 14 and 14. In reality, both had 16 forward and 16 reverse gears, but the highest gears were mechanically locked out of use. This lock could be released, enabling the 1500 model to reach a top speed of 60 km/h. In Germany, 60 km/h and 80 km/h versions could be ordered directly from the factory.

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MB-trac 1100-1500

In the autumn of 1975, the MB-trac 65/70 models were replaced by the 700 and 800 (65 hp/75 hp) models. The 800 featured a new transmission, and its 16+8 version already had a top speed of 40 km/h at that time. There were many transmission and gear ratio options overall. By the 1980s, a new cab was introduced, and the color changed from gray-red to light green. In the autumn of 1981, the turbocharged 900 was introduced, followed by the 6-cylinder 1000 in the autumn of 1982. Unlike the 700, these models had air-operated disc brakes. Initially, the 1000 had a rear lifting capacity of 4000 kg, later increased to 4700 kg, while the smaller models had to settle for 3300 kg. Along with the introduction of the 1000 in the autumn of 1982, the cab was improved. In some countries, the 700 was sold under the model number 680.

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MB-trac 700-1000

More from this manufacturer

In the autumn of 1972, the MB-trac was introduced. It utilized many components from the Unimog. All wheels were the same size, and the cabin was positioned in the center between the wheels. Work equipment could be attached to the front, rear, and on top of the back. The front lifting device and front power take-off were optional extras. The first MB-trac, known as 65/70 (65 hp DIN, 70 hp SAE), was equipped with a 3.8-liter engine developed from the engine used in MB’s trucks. The transmission featured a directional reverser with 16+16 gears.

Air-operated functions included locking of the front and rear differentials, power take-off clutches, the four-wheel drive clutch, and trailer brakes. The cabin had a flat floor and was, overall, truck-like. The front axle was sprung. Cold starting was implemented using ether injection. The lifting hydraulics lacked draft control. There were also no steering brakes. However, the main obstacle to the widespread adoption of the MB-trac was primarily its high price.

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MB-trac 65/70

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