The Landini 6550-8550 models were given Massey Ferguson model designations 254 S, 274 S, 284 S, and 294 S. Their power was slightly lower than the corresponding Landinis, and the range also included a 3-cylinder model 254 S, which in Landini terms roughly corresponded to the 5830 model. The transmission was Landini's fully synchronized 12+4 without a creeper gear. Road speed in most versions was 30 km/h instead of Landini’s 25 km/h. The hydraulic performance values were quite modest. However, the 294 was equipped with an auxiliary cylinder for the three-point linkage. The PTO speed could be engaged at either 540 or 1000 rpm.

Depending on the year, the S models were equipped with an Edschan, Mauser, or Schwächter open rear cab. In the later introduced 274 SK, which had a wheelbase 16 cm longer, as well as the 284 SK and 294 SK models, there was a Landini cab that resembled the MF 600 series in appearance, but the interior and sound insulation were more basic. A front axle differential lock was an optional extra, except for the 294.

Between 1981 and 1984, the range also included a cheap 294, which was equipped with a Mauser open rear cab. Its wheelbase was 15 cm shorter than the 294 S model, and its height was only 232 cm. The equipment was very stripped down, but a front axle locking differential was standard.

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