White-New Idea updated their larger tractors in 1990 to the Workhorse series. The increase in power by a couple of horsepower justified raising the model numbers. The engines were still 5.9- and 8.3-liter Cummins, and the transmission was 18+6 with a three-speed power shift and a top road speed of 30 km/h. The lifting capacity was slightly increased. Up to three hydraulic remotes were still available. Also, the largest four-wheel-drive models now had a longer wheelbase, yet despite this, they were reported to have a smaller turning radius than the smaller models. Telescopic drawbar ends were considered a noteworthy improvement. The simple cab featured a new seat and a noise level of 75.5-76.5 decibels.

In 1991, White tractors came under the ownership of Agco.

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