Lanz HR 7 series

The D 8516 produces 25.6 kW, or 35 hp, at a rated speed given in the register as 540 rpm, raised to 599 rpm from April 1950. The machine weighs 3,780 kg, reaches 18 km/h, and measures 3,400 mm in length, 1,780 mm in width and 2,185 mm in height.

Raising the rated speed during an ongoing production run is a documented technical change of the kind seen on long-lived series of this period, without any change to displacement or cylinder count. Genuine water cooling with a pump, compared with the purely thermosyphon cooling of related models, allows more even cooling under the higher continuous load that a raised rated speed brings with it.

When buying a used D 8516, it is worth first establishing whether the fitted engine carries the original rated speed of 540 rpm or the 599 rpm that applied from April 1950, since the two versions may need different fuel-supply parts. The water cooling calls for a check of corrosion and pump tightness, alongside the usual look at the flywheel and clutch after decades of use.