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Ursus C-45

Built: 1947–1959 · Series: C

Successor: C-451 →

More machines from model year 1947

Source: https://commons.wikimedia.org/w/index.php?curid=4583321 upl

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The C-45 from Ursus is part of the C series. Production: 1947–1959. The engine delivers 45 hp (33.1 kW), has 1 cylinder. The engine comes from Ursus. Rated speed is 630 rpm. The machine is 3,522 mm long, 1,835 mm wide and 2,190 mm high. The unladen weight is 3,750 kg. The wheelbase measures 2,036 mm. Ground clearance is 220 mm. Top speed is 6.2 km/h. The tank holds 95 litres. Transmission: 3 V/1 R or 6 V/2 R. The engine is water-cooled. Tyres: front 6.50-20, rear 12.75-28. The model was built in Poland. The fuel is Vielstoff. The linkage is category drawbar. Its predecessor was the Ursus LB-45. It was succeeded by the Ursus C-451. Around ca. 60.000 units were built. Rated output across the Ursus range ranges from 8 to 192.6 hp; the C-45 sits in the lower part of that range with 45 hp. Its immediate neighbours are the 4011 below it with 42 hp and the 3512 above it with 47 hp. Rated output across the Ursus range ranges from 8 to 190 hp; here the C-45 sits in the lower part of that range with 45 hp. 221 Ursus models across 12 series are on record.

Ursus C – early post-war tractors from the Polish maker Ursus: the small C-308 and the single-cylinder C-45, 5.9 to 33.1 kW (8 to 45 hp)

The C range brings together two very different early models from the Polish Ursus tractor works near Warsaw: the small C-308 and the heavy single-cylinder C-45. Both carry the factory's terse C type logic, yet differ fundamentally in size, weight and engine design – the C-308 ran on two-stroke petrol-oil mix, the C-45 as a multi-fuel engine able to take several kinds of fuel. Ursus was the central Polish tractor works of the post-war era, and it built its first independent designs in exactly this phase.

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The register lists 2 versions with 5.9 to 33.1 kW (8 to 45 hp) from single-cylinder engines, unladen weights of 270 to 3,750 kg, lengths of 2,700 to 3,522 mm, widths of 695 to 1,835 mm, heights of 970 to 2,190 mm and rated speeds of 630 to 2,400 rpm.

Ursus was the central tractor brand of socialist Poland, supplying farms across the country and export markets in the Eastern Bloc for decades; the early C models mark the build-up of an independent Polish tractor production in the first post-war years, long before the brand gained international standing with larger, licence-built ranges.

On used examples, the condition of cylinder and piston, the tightness of the fuel system, the state of clutch, gearbox and brakes, and rust on sheet-metal parts and the frame all count; spare parts for these early types are scarce and run almost entirely through collectors and specialist restorers.

Sources: SpecCodex register, model data: Ursus C, Ursus (manufacturer)

Technical data

Engine

Engine make	Ursuscorrect
Fuel	Vielstoffcorrect
Power	45 hp (33.1 kW)correct
Rated speed	630 rpmcorrect
Cylinders	1correct
Displacement	10,300 cccorrect
Bore	225 mmcorrect
Stroke	260 mmcorrect
Cooling	water-cooledcorrect

Dimensions and weights

Length	3,522 mmcorrect
Length	3,430 mmcorrect
Width	1,835 mmcorrect
Width	1,800 mmcorrect
Height	2,190 mmcorrect
Height	2,260 mmcorrect
Wheelbase	2,036 mm (2,035 in)correct
Ground clearance	220 mmcorrect
Unladen weight	3,750 kg (3,380 lbs)correct

Drivetrain and chassis

Drive	rear-wheel drivecorrect
Gearbox	3 V/1 R or 6 V/2 Rcorrect
Gearbox make	Ursuscorrect
Forward gears	3 or 6correct
Reverse gears	1 or 2correct
Front tyres	6.50-20correct
Rear tyres	12.75-28correct
Top speed	6.2 km/hcorrect

Working data

Fuel tank capacity	95 lcorrect

Origin and approval

Plant	Polandcorrect
Units built	ca. 60.000correct

Other data

Linkage category	drawbarcorrect
Predecessor	Ursus LB-45correct
Successor	Ursus C-451correct

Where this model stands

Power-to-weight ratio: 8.8 kW/t (33 kW / 3.8 t)

Power class: Universal (40–100 hp)

Stronger than 29% of the tractors in the register — out of 15,663 models with a stated power figure.

Calculated from the documented figures above — not a rating.

Frequently asked questions

How much power does the Ursus C-45 have?

The Ursus C-45 delivers 45 hp.

How much does the Ursus C-45 weigh?

The unladen weight is 3,750 kg.

What engine does the Ursus C-45 have?

1 cylinders, Vielstoff.

How fast does the Ursus C-45 go?

Top speed is 6.2 km/h.

What are the dimensions of the Ursus C-45?

3,522 mm × 1,835 mm × 2,190 mm.

When was the Ursus C-45 built?

Production years: 1947–1959.

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.
Check the weights in the papers against the figures here — attachments change them.
Check front and rear tyre sizes: mismatched pairs strain the drivetrain.
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 39 individual figures for this model. They come from 3 recorded sources; 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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