8 material differences · fewer than 12
Tractor oneHELA D 391939No measured PTO figureTractor twoLanz D 65111931–1935No measured PTO figure
Which should you choose?
Read our verdict on the D 39 and the D 6511 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
8 material differences · 2 fields identical or within 5%, which is not counted as material
| Field | D 39 | D 6511 | 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 | 8.3–9.7 mph · 13.4–15.6 km/h | differs |
| Clutch declared | Single-plate dry clutch by Fichtel & Sachs | Three-jaw clutch operated by two pedals with clutch brake | differs |
| Hydraulics & hitch | |||
| Rear PTO speeds declared | 540 rpm | 540 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 3,086 lb · 1,400 kg | 8,708 lb · 3,950 kg | +182% D 6511 |
| Wheelbase declared | 68.9 in · 1,750 mm | 73.4 in · 1,864 mm | +7% D 6511 |
| Length declared | 100.8 in · 2,560 mm | 121.7 in · 3,090 mm | +21% D 6511 |
| Width declared | 59.1 in · 1,500 mm | 75.3 in · 1,912 mm | +27% D 6511 |
| Ground clearance declared | 10.2 in · 260 mm | 9.1 in · 230 mm | +13% D 39 |
| Fuel tank declared | 40.2 qt · 38 L | 63.4 qt · 60 L | +58% D 6511 |
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
- Source: Traktorenlexikon, “HELA D39 (1939)”
- Source: Traktorenlexikon, “Fahr D 22”
Lanz D 6511 sources
Source
- Source: Traktorenlexikon, “Lanz D 6511”