Zm „ursus” Field Boy P 300
Series: Other models
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
The Field Boy P 300 is a small tractor from Zm „ursus”, the Polish tractor works. The name Field Boy suggests a handy field tractor; the type number 300 comes from the works designation. It is powered by an Ursus engine of type S-312B, which was made at the works itself and so belonged to its own drive programme.
Drive goes to the rear wheels, and the gearbox is laid out as 6/2, meaning six forward and two reverse gears. For a small tractor that is a decent spread of ratios, allowing ploughing and haulage alike. The dimensions of 3,030 mm length, 1,680 mm width and 1,500 mm height on a wheelbase of 1,850 mm show a compact vehicle that stays nimble on small plots.
For collectors and restorers, the combination of works engine and rear-wheel drive is a typical trait of Polish smallholder tractors. The Field Boy belongs to a line in which simple technology and easy repair mattered more than comfort.
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.
Read on 3 more paragraphs
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
Technical data
Engine
| Engine | Ursus S-312Bcorrect |
|---|
Dimensions and weights
| Length | 3,030 mmcorrect |
|---|---|
| Width | 1,680 mmcorrect |
| Height | 1,500 mmcorrect |
| Wheelbase | 1,850 mmcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 6/2correct |
Frequently asked questions
What are the dimensions of the Zm „ursus” Field Boy P 300?
3,030 mm × 1,680 mm × 1,500 mm.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
Request a quote →
We ask the suppliers and come back with price and lead time.
Request spare parts →
This page carries 7 individual figures for this model. They come from 2 recorded sources; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
Missing a figure you were looking for? Report it →
Know this machine better? Have a photo, a manual, or know that a figure is wrong? Add it to the register →
Sources: Wikipedia (CC BY-SA 4.0) (retrieved August 2026) · speccodex.com (retrieved October 2026) · Values adopted and presented in our own form; changes from the source are possible. · How we check the data
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
