Engineering:MB-trac

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MB-trac
MB-trac 443.166 JM 2023 08 12 5D410155.jpg
MB-trac 1600 turbo
Typeagricultural
ManufacturerDaimler-Benz AG
Production1973–1991
PropulsionEqual-size wheels

MB-trac is a range of agricultural tractors developed and produced from 1973 until 1991 by Mercedes-Benz Group, formerly known as Daimler-Benz. It is based on the trac design principle for tractors and shares its drivetrain with the Unimog. Mercedes-Benz offered the MB-trac in light duty, medium-duty, and heavy-duty versions in four different type series: 440, 441, 442, and 443. About 41,000 MB-tracs were made by former Daimler-Benz,[1] before the manufacture was sold to Werner Forsttechnik in the early 1990s, who developed the WF trac skidder from the MB-trac.

MB-trac types and model family

Naming scheme

MB-trac turbo 900

In total, four type series (440, 441, 442, and 443) and twenty-one different series-production types of MB-trac were made, with either ten or sixteen models, depending on whether the Turbo-designated models are considered separate from the non-Turbo-designated models. The naming scheme of the MB-trac is mostly homogeneous, with MB trac followed by a number roughly indicative of the engine's DIN-PS power output times ten. Models equipped with a turbocharger have a turbo suffix in their model name, and models with an additional intercooler have an intercooler suffix instead. The exceptions to this naming scheme are the MB-trac 65/70, which has a power-output figure indicative of the DIN-PS/SAE-hp power output, MB-trac 1500 and MB-trac 900, which have no turbo suffix despite being turbocharged, and the MB-trac turbo 900, which has a turbo prefix rather than a suffix. The MB-trac name is spelled MB-trac in technical documents, but MB trac on the tractors' bonnets.[2]

Model overview

Light-duty (440 series)

Model Type designation Engine type Displacement dm³ Rated power in kW (PS)

at min−1

Torque N·m

at min−1

Production Number built
MB-trac 65/70 440.161 OM 314 3.784 48 (65)

2,400

216

1600

1973–1975 2.714
MB-trac 700 440.162 OM 314 3.784 48 (65)

2,400

216

1600

1976–1982 1.364
MB-trac 700 440.167 OM 314.LIII 3.784 48 (65)

2,400

226

1400

1982–1987 1.569
MB-trac 700 440.171 OM 364.V 3.972 50 (68)

2,400

235

1800–1900

1987–1991 899
MB-trac 800 440.163 OM 314 3.784 53 (72)
2.550
from 06/79: 55 (75)
2.600
221

1600

1975–1982 8.717
MB-trac 800 440.168 OM 314.LII 3.784 55 (75)

2,600

245

1600

1982–1987 1.990
MB-trac turbo 900 440.169 OM 314A 3.784 63 (85)

2,400

294

1600

1982–1987 3.277
MB-trac 800 440.172 OM 364 3.972 57 (78)

2,400

263

1500–1800

1987–1991 835
MB-trac 900 440.164 OM 314A 3.784 63 (85)

2,400

294

1600

1981–1982 1.090
MB-trac 900 turbo 440.173 OM 364A.II/1 3.972 66 (90)

2,400

313

1400–1800

1987–1991 2.148

Medium-duty (441 series)

Model Type designation Engine type Displacement dm³ Rated power in kW (PS)

at min−1

Torque N·m

at min−1

Production Number built
MB-trac 1000 441.161 OM 352 5.675 70 (95)

2,400

324

1700

1982–1987 4.346
MB-trac 1000 441.162 OM 366.XV 5.958 74 (100)

2,400

350

1500–1800

1987–1991 2.613
MB-trac 1100 441.163 OM 366 5.958 81 (110)

2,400

375

1500–1800

1987–1991 1.283

Heavy-duty (442 and 443 series)

Model Type designation Engine type Displacement dm³ Rated power in kW (PS)

at min−1

Torque N·m

at min−1

Production Number built
MB-trac 1100 442.161 OM 352.XIX 5.675 81 (110)

2,600

364

1,800

1976–1984 551
MB-trac 1100 443.160 OM 352.XIX 5.675 81 (110)

2,600

364

1,800

1984–1987 72
MB-trac 1300 443.161 OM 352.XIX 5.675 92 (125)

2,500

412

1,700

1976–1987 2.908
MB-trac 1300 turbo 443.163 OM 366A.IV/1 5.958 92 (125)

2,400

425

1,600–1,800

1987–1991 474
MB-trac 1500 443.162 OM 352A.LIII/3 5.675 110 (150)

2,500

from 03/82: 510

1500

1980–1987 2,855
MB-trac 1400 turbo 443.164 OM 366A.V/1 5.958 100 (136)

2,400

470

1600–1800

1987–1991 398
MB-trac 1600 turbo 443.166 OM 366A.VI/1 5.958 115 (156)

2,400

530

1600–1800

1987–1991 1,072
MB-trac 1800 intercooler 443.166 OM 366LA 5.958 132 (180)

2,400

645

1600–1800

1990–1991 190

[2]

History

MB-trac 65/70

Former Daimler-Benz had been making the Unimog, a tractor-like implement carrier vehicle, since 1951. Mercedes-Benz customers however sought a dedicated agricultural and silvicultural tractor. Thus, Daimler-Benz, on 25 March 1968 issued a development order for an agricultural tractor that would share various components with the Unimog 403. Throughout the development phase, various prototypes were built; these were designated the AM 60. During the development phase, a 150 PS (110 kW) version with a rotating steering-column and driver seat was considered, but originally not put forward.[2]

Eventually, the 440 series MB-trac was presented at the 1972 DLG fair as the MB-trac 65/70. Series production started on 1 July 1973 at the Mercedes-Benz Gaggenau plant (de), alongside the Unimog. Until 31 December 1973, 520 units of the MB-trac were produced. The original colour was pebble-grey with red wheels.[2] In March 1976, the heavy-duty 442 and 443 series MB-trac production commenced, which shares various components with the Unimog 425.[2]

MB-trac 1800 intercooler

In 1987, Daimler-Benz entered into a strategic cooperation with Deutz, who at the time built the Deutz Intrac, a similar trac-like tractor. Joint development was carried out by Daimler-Benz (40 %) and Deutz (60 %) owned Trac-Technik-Entwicklungsgesellschaft (TTE) throughout the late 1980s, however, due to cost concerns, development was cancelled, and it was decided at Daimler-Benz to cancel the MB-trac as a result.[3]

In 1990, the MB-trac lineup saw its last and most powerful addition, the MB-trac 1800 intercooler. It was based on a 1600 turbo, but had an additional intercooler installed. Production ended in 1991, and Daimler-Benz sold the manufacture to Werner Forsttechnik, who developed the WF trac from the MB-trac.[4]

Technical description

The MB-trac comprises four different series which have distinct technical differences. The following description thus only gives a basic overview of the MB-trac.

In general, the MB-trac is a trac type of agricultural tractor which is characterised by four same-size wheels, a frame undercarriage for the engine and front axle, and steerable wheels rather than articulated steering. The cab is installed in the center of the vehicle. This design allows the MB-trac to mount implements in front, on the rear axle behind the cab, and behind the rear axle.

Despite sharing its drivetrain with the Unimog 403 or Unimog 425, the MB-trac is not a modified Unimog. It is distinctly different and much more suited for agricultural use, for example, due to its larger wheels.[5] Unusual for an agricultural tractor, the MB-trac's front axle is coil sprung, which improves its on-road handling characteristics.

Light-duty MB-trac models were equipped with the Mercedes-Benz OM 314 or Mercedes-Benz OM 364 four-cylinder Diesel engines and use a gearbox with 16 forward and 8 reverse gears.[6] The gears are shifted using a conventional H-shift lever which is fitted with a splitter device. A separate gear lever is used to engage forward or reverse, and the same lever is also used to shift into a high-speed forward range, which does not exist in reverse. Medium-duty models are technically similar to the light-duty models but feature the Mercedes-Benz OM 352 or OM 366 six-cylinder engines. The heavy-duty MB-trac models were equipped with the Mercedes-Benz OM 352 or Mercedes-Benz OM 366 six-cylinder Diesel engines,[2] and have a dedicated reverse-drive feature with a reversible cab and gearbox.[6]

Bibliography

  • Wener Schmeing, Hans-Jürgen Wischof: Traktoren der Daimler AG – Unbekannte Einblicke in Technik und Wirtschaft: vom Unimog zum MB-trac und warum es keinen Nachfolger gab, Vol. 2, DLG-Verlag, DLG-Verlag, 2011, ISBN 9783769007343
  • Ward, Rod (2019). Mercedes-Benz Part Three: Unimog & MB-Trac. Auto Review series, no. 149. Leeds, UK: Zeteo Publishing. OCLC 1137103185. 

References

  1. Torsten Seibt: Der Mercedes unter den Ackerschleppern, auto motor und sport, 20 June 2020, retrieved 23 August 2023
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Carl-Heinz Vogler: 101 Dinge, die man über Unimog wissen muss, GeraMond-Verlag, München 2020, ISBN 9783964530066
  3. Jürgen Hummel, Alexander Oertle: Deutz 2 – Traktoren seit 1978, Motorbuchverlag, Stuttgart 2014, ISBN 9783613310285
  4. Wener Schmeing, Hans-Jürgen Wischof: Traktoren der Daimler AG – von der Entstehung und dem Ende des MB-trac, DLG-Verlag, DLG-Verlag, 2010
  5. Karl Theordor Renius: Fundamentals of Tractor Design, Springer, Cham 2019, ISBN 978-3-030-32803-0, p. 12
  6. 6.0 6.1 Stuart Gibbard: The Tractor Book: The Definitive Visual History, Dorling Kindersley, 2015, ISBN 978-0-2410-1482-0, p. 204