Zm „ursus” Other models
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Zm 'Ursus' Field Boy P 300 – Polish tractor with two-wheel drive: Ursus S-312B engine, 6-plus-2-speed gearbox, 1,850 mm wheelbase, 1,680 mm wide
Ursus is a long-established Polish farm-equipment works near Warsaw that has built tractors and commercial vehicles for decades and ranks among the best-known brands of Polish farm equipment. The Field Boy P 300 is fitted with two-wheel drive and carries an English model name intended for export.
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The engine, designated Ursus S-312B, comes from the works' own production. The gearbox offers 6 forward and 2 reverse gears. At 3,030 mm long, 1,680 mm wide, with a 1,850 mm wheelbase and 1,500 mm height, the Field Boy P 300 is a compact standard tractor.
The export name 'Field Boy' shows that Ursus deliberately marketed this tractor to Western markets, while the S-312 engine designation points to the works' own line of diesel engines, used across several tractor sizes from this maker. Two-wheel drive with a powered rear axle was the usual layout for this tractor class in the 1970s and 1980s.
When buying an Ursus tractor of this class, the condition of the clutch, the tightness of the hydraulic system and corrosion on the load-bearing sheet-metal parts matter most. As Ursus engines and gearboxes were built in large numbers, parts for these assemblies remain comparatively easy to obtain even today. On export versions, it is also worth checking fittings such as lighting or the PTO guard, which varied depending on the target market.
Sources: SpecCodex-Register: Kennwerte des Modells Zm „Ursus” Field Boy P 300
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