Zm „ursus” 710
Series: Ursus
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The story of this vehicle
The Ursus U 710 never reached a field. It was built as a prototype tractor of the 1.4 class and a prototype it remained — although behind it stood one of the more ambitious Polish engineering efforts of those years.
Work on a unified family of light and medium tractors began in the second quarter of 1969. At its heart was a three-speed planetary transmission called “Trimat”, developed specifically by Professor Edward Habich; it allowed gear changes under load, which in this class was by no means a given at the time. In 1970 and 1971, by then together with engineers from Renault, the second generation of the family took shape: Ursus 310, 510, 610 and 710. The design and its gearboxes were covered by provisional patent applications.
The S-44 engine — a liquid-cooled four-cylinder diesel with direct injection, 4,180 cm³ and 53 kW (72 hp) — was not meant for agriculture alone. A variant went into mining: the S-44G was adapted for workings at risk of explosion and ran in the prototype locomotive Lds-70.
What decided the fate of the series, in the end, was industrial policy. A government resolution of 3 January 1973 steered tractor development towards buying licences instead. The domestic design was shelved.
Facts from Wikipedia „Ursus 710“ (pl) · Regierungsbeschlüsse Nr. 134/71 und Nr. 2/73, dort zitiert · checked 2026-08-24. Our own wording, not copied.
Zm 'Ursus' 1934 – Polish tractor with four-wheel drive: turbocharged DS Martin UR-IV engine rated at 140 kW (190 hp), 16-plus-8-speed gearbox, up to 5,020 mm long with ballast weights
Ursus is a long-established Polish farm-equipment works near Warsaw. The tractor designated '1934' from this works is fitted with four-wheel drive; nothing certain can be said about its build year or further company history from the recorded values.
Read on 3 more paragraphs
The DS Martin UR-IV Z8604.020 engine is turbocharged and produces 140 kW, or 190 hp. The gearbox offers 16 forward and 8 reverse gears. Length stands at 4,500 mm, reaching up to 5,020 mm with rear ballast weights fitted, with a wheelbase of 2,706 mm and a width of 2,295 mm.
190 hp from a turbocharged engine, four-wheel drive and a finely stepped 16-plus-8 gearbox point to a powerful tractor built for heavy field work and precise runs with mounted implements. The option to fit ballast weights, which add over 500 mm to the overall length, suggests use with heavy drawn or mounted implements, where extra weight improves traction.
When buying such a powerful turbocharged tractor, the condition of the turbocharger, the tightness of the charge-air system and the service history of the four-wheel-drive system matter most. The full range of gears in the 16-plus-8 gearbox should also be tested in operation, as synchromesh wear is a common issue in such finely stepped transmissions, and the ballast-weight mounts are worth checking for corrosion and cracking.
Sources: SpecCodex-Register: Kennwerte des Modells Zm „Ursus” 1934
Technical data
Engine
| Engine | Ursus S-44, 4-cylindrowy, 4180 cm³, 53 kW (72 KM)correct |
|---|
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 12/4correct |
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.
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This page carries 3 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Sources: Wikipedia (retrieved August 2026) · How we check the data
Tractor in 3D section
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