Hürlimann D-550 Hydrostat
Built: 1974 · Series: D-Reihe
More machines from model year 1974
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
Hürlimann D Series – Swiss Diesel Tractors From the 1940s to the 1970s: two- to six-cylinder engines with 20.6 to 106.6 kW (28 to 145 hp), 2,360 to 9,186 cm³ displacement
The D designation covered the diesel tractors built by the Swiss manufacturer Hürlimann in Wil from the late 1940s to the mid-1970s – from the D-400 (production starting 1946) through the D-100 and D-200 families to the D-550 Hydrostat of 1974. That long span explains the wide range of register data: output from 20.6 to 106.6 kW, models rated in horsepower from 28 to 145 hp, and cylinder counts from two to six.
Read on 3 more paragraphs
Recorded operating weight runs from 1,480 to 6,350 kg, displacement from 2,360 to 9,186 cm³, and wheelbase from 1,636 to 3,000 mm. Top speed of the listed models spans 20 to 45 km/h, reflecting the long technical development from early post-war designs to later Synchromatic gearboxes.
Hürlimann was an independent Swiss builder before the company became part of the Italian SAME group. For collectors and buyers of historic D-series tractors, the exact model designation matters most, since engine, gearbox and drive type vary considerably within the series.
Across the three decades of this series, mounting technology also changed: early D models used a category I three-point hitch, the more powerful later types already category II under ISO 730, and the PTO moved from the single-speed 540 standard to a two-speed version with 540 and 1,000 rpm. Parts for early D models are today mainly available through specialist Hürlimann and SAME dealers.
Sources: SpecCodex register, model data: Hürlimann D-Reihe, Hürlimann
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 135 hp (99.2 kW)correct |
| Rated speed | 2,300 rpmcorrect |
| Cylinders | 6correct |
| Displacement | 5,675 cm³correct |
| Bore | 97 mmcorrect |
| Stroke | 128 mmcorrect |
| Compression ratio | 16correct |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 4,430 mmcorrect |
|---|---|
| Width | 2,250 mmcorrect |
| Height | 1,950 mmcorrect |
| Wheelbase | 2,910 mmcorrect |
| Unladen weight | 4,300 kgcorrect |
Drivetrain and chassis
| Drive | rear- or four-wheel drivecorrect |
|---|---|
| Gearbox | continuously variablecorrect |
| Front tyres | 12.5-18correct |
| Rear tyres | 15-34correct |
| Top speed | 27 km/hcorrect |
Origin and approval
| Construction | semi-frame constructioncorrect |
|---|---|
| Units built | 1correct |
Other data
| Linkage category | Cat IIcorrect |
|---|
Where this model stands
Power-to-weight ratio: 23.1 kW/t (99 kW / 4.3 t)
Power class: Large (100–180 hp)
Stronger than 79% 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 Hürlimann D-550 Hydrostat have?
The Hürlimann D-550 Hydrostat delivers 135 hp.
How much does the Hürlimann D-550 Hydrostat weigh?
The unladen weight is 4,300 kg.
What engine does the Hürlimann D-550 Hydrostat have?
6 cylinders, 5,675 cm³ displacement, Diesel.
How fast does the Hürlimann D-550 Hydrostat go?
Top speed is 27 km/h.
What are the dimensions of the Hürlimann D-550 Hydrostat?
4,430 mm × 2,250 mm × 1,950 mm.
When was the Hürlimann D-550 Hydrostat built?
Production years: 1974.
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 24 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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Other models in this series
D 100
D 200 S
D 500 S
D 60
D 60 Spezial
D 80 SSK
D 80 SSP
D 80 SSP Bj. 1958
D 800
D 90
D-100 Allrad
D-100 S/L
Sources: [1]
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
