page_title: Unimog 406
section_title: The Unimog 406 model family
hierarchical_section_title: Unimog 406 / The Unimog 406 model family
caption_attribution_description: Español: Unimog 426 del Ejercito ArgentinoDeutsch: Unimog 426 der argentinischen StreitkräfteEnglish: Unimog 426 of the Argentine army
context_page_description: The Unimog 406 is a vehicle of the Unimog-series by Mercedes-Benz. A total of 37,069 units were manufactured by the Daimler-Benz AG in the Unimog plant in Gaggenau from 1963 to 1989. The 406 was the first medium duty Unimog, having a larger wheelbase of 2380 mm and more than twice the engine power of the Unimog 401. Unlike the initial Unimog, the 406 does not have a car engine but a heavy duty truck engine instead. Several following Unimog versions were based on the 406. There were eleven different types made of the Unimog 406, which were available in four models with a closed two-door or four-door cab, as Cabrio and as an OEM part. During its long production period, the 406 received several technical refinements. In 1964, the precombustion chamber diesel engine OM 312 was replaced with the direct injected OM 352. Disc brakes followed in 1973. For many enthusiasts, the Unimog 406 represents the classical Unimog, having agricultural and silvicultural applications. It was successful and the best embodiment of the word Universal-Motor-Gerät considering all prior Unimogs.
context_section_description: With the Unimog 406, Daimler-Benz laid the foundation for the expansion of the Unimog family. 94,215 Unimogs of eight different series belonging to the 406 family were made from 1962 to 1994. The family included similar models all based on the technical and optical design of the Unimog 406 with different engines, wheelbases and applications. In 1965, the first long wheelbase model in addition to the 406 was offered, the Unimog 416. It had the same wheelbase as the long wheelbase model of the Unimog 404: 2900 mm. It was also available with 3400 mm. Later, the conveyance motor models and the more powerful prototypes of the Unimog 406 were also integrated into the Unimog 416 series. Engines with 80–125 PS (59–92 kW) were offered for this model. It was the most popular Unimog of the 406 family with 45,544 units made. In March 1966, the Unimog 421 was added to the Unimog family, a weaker model with 40 PS (29 kW). It was followed by the Unimog 403 in August 1966. The 403 has the OM 314 engine with 54 PS (40 kW) that was initially planned for the 406 and is therefore a cheaper model. With the increasing demand for higher power output, Daimler-Benz offered a 66 PS (48 kW) version starting in 1969 that was followed by a 72 PS (53 kW) model in 1976 for the 403. Optically and technically there are no differences between the Unimog 403 and 406 other than the engine. Since Daimler-Benz also wanted to offer an inexpensive version of the long wheelbase model, they created the Unimog 413. Due to the less powerful OM 314 engine, it was less expensive but also very unpopular, only 633 Unimog 413 were made. From 1969 to 1971, CKD-kits of the Unimog 421 were made for the production in Argentina. These Unimogs belong to the Unimog 431 series.
  While the majority of military Unimogs are 404s, some 406-family Unimogs were also made for military use. These are the 426 and the 419. Starting in 1969, completely knocked-down (CKD) Unimog 416 parts were made in Gaggenau and shipped to Argentina where these parts were used to build a licensed version of the Unimog which was given the number 426. In total, 2643 Unimog 426 were made for the Argentine, Chilean, Peruvian and Bolivian military. A version for the United States Army with the type number 419 was made starting in 1986. Approximately 2200 units were planned, in total, 2416 were produced. The Unimog 419 has the same wheelbase as the 406 but comes with a more powerful version of the OM 352 engine with 110 PS (81 kW). Unlike other Unimogs, it was sold under the Freightliner brand name and classified as Small Emplacement Excavator (SEE) tractor that was used as an engineer vehicle. The Unimog 406.145 was a military aircraft tractor.
caption: Unimog 426 of the Argentine Army
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