7 material differences · fewer than 12
Tractor oneHELA D 391939No measured PTO figureTractor twoJ.I. Case Modell-S1941–1952No measured PTO figure
Which should you choose?
We will not advise between these two machines, because their unladen weight differs by more than 25% (42%); they were not built in overlapping years (1939–1939; 1941–1952). The figures below are side by side so you can judge them yourself; each says whether it was measured, claimed or declared by its source.
Field by field
7 material differences · 3 fields identical or within 5%, which is not counted as material
| Field | D 39 | Modell-S | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 21.6 hp | 21.6 hp | — |
| Engine declared | KHD F2M 414 | — | — |
| Displacement declared | 2.20 L | — | — |
| Transmission | |||
| Top speed declared | 12.1 mph · 19.4 km/h | 10.0 mph · 16.1 km/h | +20% D 39 |
| Clutch declared | Single-plate dry clutch by Fichtel & Sachs | Hand lever operated wet single plate Twin Disc clutch | differs |
| Hydraulics & hitch | |||
| Rear PTO speeds declared | 540 rpm | 541 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 3,086 lb · 1,400 kg | 4,374 lb · 1,984 kg | +42% Modell-S |
| Wheelbase declared | 68.9 in · 1,750 mm | 66.0 in · 1,676 mm | — |
| Length declared | 100.8 in · 2,560 mm | 108.5 in · 2,756 mm | +8% Modell-S |
| Width declared | 59.1 in · 1,500 mm | 56.3 in · 1,429 mm | — |
| Ground clearance declared | 10.2 in · 260 mm | 11.3 in · 286 mm | +10% Modell-S |
| Fuel tank declared | 40.2 qt · 38 L | 56.0 qt · 53.0 L | +39% Modell-S |
Height is not in this table. It is not one measurement: the sources measure it to different points — over the cab on some machines, over the steering wheel or the exhaust on others — and the same tractor measured two ways can differ by most of a metre. It appears here only when both machines' figures carry the point they were measured to and it is the same point, which is not the case for these two. Each machine's own page prints its height as its source gives it.
HELA D 39 sources
- Source: Traktorenlexikon, “HELA D39 (1939)”
- Source: Traktorenlexikon, “Fahr D 22”
J.I. Case Modell-S sources
- Source: Traktorenlexikon, “Case S”