Lanz Bulldog D 9506
# Lanz Bulldog D 9506

The Lanz Bulldog D 9506 is a tractor of the HR 8 series, produced by Heinrich Lanz AG in Mannheim from 1934 to 1955, with a production stop in 1945. In total, 3817 units were produced. The tractor was sold under the brand name Ackerluft (field-air). The Ursus C-45, produced in Poland from 1947 to 1959, was a copy of the D 9506.

## Description

The D 9506 utilises a frameless block construction. It has a rear live axle and a dead front beam axle. The front axle was available with optional leaf springs. The tractor has air filled tyres. The D 9506 does not have a lockable differential. The gearbox is a manual 3-speed Lanz gearbox with a reverse gear, and an additional range, this makes 6 forward gears and 2 reverse gears. The minimum speed is 3,3 km/h in first gear, maximum speed is 16,7 km/h in sixth gear. The drum brakes at the rear wheels are foot-operated, the handbrake locks the gearbox.

The standard Lanz hot-bulb engine with a displacement of 10.3 L was used, it has a thermosiphon cooler. Compared to the predecessor series HR 6 and HR 7, the engine now has a better speed governor, the rated engine speed was increased from 540 $min^{−1}$ to 630 $min^{−1}.$ Many sorts of diesel oil can be used as fuel. The D 9506 has an electrical system. If a starter motor is used, the lead-battery has a capacity of 94 Ah, without a starter motor the capacity is 75 Ah. The Lanz factory offered additional accessories, such as a cab or fenders.

### Technical data

| | D 9506 |
| - | - |
| Production | 1934–1944 1945–1955 |
| Engine characteristics | One-cylinder, two-stroke, hot-bulb akroyd engine, no valves, no carburettor; thermosiphon cooling system |
| Fuel | Fuel oil, Diesel fuel, Kerosene, Biodiesel |
| Fuel injection pressure and injection time | 80 bar, crank angle 135° |
| Bore × Stroke, Displacement | 225 mm × 260 mm, 10.338 dm³ |
| Compression ratio | 5:1 |
| Rated power at 630 $min^{−1}$ | 28 kW |
| Maximum power for an hour at 630 $min^{−1}$ | 33 kW |
| Torque at 630 $min^{−1}$ | 500 N·m |
| Gearbox | 3-speed manual with two ranges (6 forward, 2 reverse gears) |
| Propulsion | Tyres |
| Maximum speed | 16.7 km/h |
| Fuel consumption | 326 g/kWh |
| Fuel tank capacity | 90 L |
| Electrical power system | Lead-acid battery, 12 V / 94 Ah |
