In 1976, Hürlimann did what should have been done 10 years earlier: changed the design of their tractors to a more angular style. The smallest model in the larger series was the 7700 (77 hp). Its 4.4-liter engine had been increased to 4.9 liters. The turbo version, the T-9200, had 92 hp. The transmission options included a 10+2 gearbox, with the highest gears now synchronized, and a fully synchronized 12+6 gearbox. Hydrostatic steering was now standard. The four-wheel-drive models featured a ZF front axle with a center driveshaft. At this stage in Switzerland, tractors were still largely without cabins, and the available cabins were fairly basic. The basic version came with a rollover protection frame, on which glass and doors could be installed.

At the top of the range, the successor to the Mercedes-engined D 550 was named the T-14000.

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