Technical specification of agricultural tractor David Brown Implematic 850/880/900 :
| Model | David Brown 850 | David Brown 880 | David Brown 900 |
| Years of production | 60-63 | 62-64 | 56-58 |
| Engine model / type | DB AD4/30 | – | |
| Number of cylinders / turbocharging | 4 | 4 | 4 |
| Engine displacement (cm3) | 2523 | 2705 | 2705 |
| Piston dimension / stroke (mm) | 88,9×101,6 | 92,1×101,6 | 92,1×101,6 |
| Maximum engine power (hp) / rpm | 37/2000 | 43/2000 | 40/2000 |
| Torque (Nm) / rpm | 149/1175 | 169/1200 | – |
| Number of gears (front + rear) | 6+2 | 6+2/12+4 | 6+2 |
| Number of synchronized gears (front+rear) | – | – | – |
| Speed-Shift | – | – | – |
| Type of reverse | – | – | – |
| Driving speed (km/h) | 3,5-24,0 | 3,8-28,0 | – |
| Max Driving speed (km/h) | 27 | 27,4 | – |
| Hydraulic pump capacity (L/min) | 22,7 | 22,7 | 28 |
| 3-Point Hitch control | mech | mech | mech |
| 3-point hitch max load (kg) | 1000 | 1000 | 820 |
| PTO speed (rpm) | 540/1000 | 540/1000 | 540 |
| Disc brake type (dry / wet) | – | – | – |
| Type of control of the braking system | mech | mech | mech |
| Turning radius 2WD (m) | 4,8 | – | – |
| Turning radius 4WD (m) | – | – | – |
| Front wheel 2WD | 5,50-16 | 6,00-16 | 6,00-16 |
| Front wheel 4WD | – | – | – |
| Rear wheel 2WD | 11,2/10-28 | 12,4/11-28 | 12,4/11-32 |
| Rear wheel 4WD | – | – | – |
| 2WD total weight (kg) | 1580 | 1800 | 1920 |
| 4WD total weight (kg) | – | – | – |
| Total height with cabin (cm) | 130 | 138 | – |
| Total length (cm) | 290 | 310 | – |
| Total width (cm) | 191 | 191 | 192 |
| Fuel tank capacity (l) | – | – | – |
| Cabin sound level (dB) | – | – | – |
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David Brown is a British company that was a major tractor manufacturer from the 1930s to the 1970s. In 1936, David Brown first started producing tractors in a joint project with Harry Ferguson, which resulted in the Ferguson-Brown tractor. Immediately after World War II, David Brown became a major British manufacturer of agricultural tractors. The company’s main manufacturing plant was located in Meltham Mills, in the English county of Yorkshire. David Brown became a subsidiary of Tenneco in 1972 and operated as a division of JI Case. By 1983, tractors were no longer built under the David Brown name, but were signed with the Case logo. The Meltham plant was closed in 1988. It was the main factory where all David Brown farm tractors were manufactured.
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