At the end of 1972, alongside the smaller models, the Renault 551 and 651 were introduced, following the straight-line design that had already been introduced a couple of years earlier in the larger models. The air-cooled MWM engine was a 3-cylinder in the 55-horsepower 551 and a 4-cylinder in the 65-horsepower 651. The gearbox was a new fully synchronized 12+3. The road speed remained low. The hydraulics were the same as in the smaller models, with a pump output of 26 liters per minute and a lifting capacity of 2,000 kg (in the latest models in 1980, 2,500 kg). Draft sensing worked through the draft arms, called Tracto Control. The steering was hydrostatic. The four-wheel-drive model had a Carraro axle. The tractors were initially available with either a sun canopy or a Timmermann cab. In 1976, a more refined cab was introduced, which included, among other features, opening side windows.

At the end of 1973, the new lineup was expanded upwards with models 751 and 851. The more powerful one of these had a turbocharged four-cylinder MWM engine. Unlike the smaller models, these engines were water-cooled. The construction was more robust in many respects compared to the smaller models. For example, the lifting capacity was 2,750 kg. The 12+12 gear range shuttle gearbox already had many low gears, and a true creeping gear was also available. The 1980 models featured a slightly higher road speed and a differential lock on the front axle of the four-wheel-drive models.

In 1977, the 781 was introduced alongside the 751, featuring, among other things, a higher lifting capacity and, judging by its significantly greater weight, a sturdier construction. In 1979, the 681 with similar features was introduced.

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