In 1994, ZTS Martin introduced the UR IV series tractors alongside the UR II tractors. The UR IV models featured a 7.3-liter engine and a new fully synchronized gearbox with either 16+16 or 32+16 gears. The four-wheel drive transmission was integrated into the gearbox. The hydraulic output was 66.6 liters, and the lifting capacity, depending on the source, was either 7 or 7.75 tons. The rear axle was more robust than before. ZTS's production volumes in the late 1990s were around a thousand tractors annually. After 2002, the numbers became very small. At that time, more Ursus 1734-1954 series tractors were manufactured in Martin.

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