David Brown 3800 Selectamatic Specs ( 1968-1971 )
Overview
The David Brown 3800 Selectamatic is a utility farm tractor produced between 1968 and 1971 in Meltham Mills, England, featuring a 2.4L 3-cylinder gasoline engine. It was configured with either a 6-speed or 12-speed gear transmission and achieved a tested PTO power of 39.16 hp in Nebraska Test 1018. The unit is built on a 2WD chassis with manual steering and a rear lift capacity of 1,600 lbs.
Ideal Applications
Tested Performance Metrics:
During Nebraska Tractor Test 1018, the 3800 Selectamatic recorded a maximum drawbar pull of 4,419 lbs and achieved 32.13 hp on the drawbar using gear 3 for the power test.
Hydraulic System Specifications:
The Selectamatic hydraulic system is rated for a pump flow of 7.3 gpm at 2,000 psi and includes both position and draft control for the Category I rear hitch.
Transmission and Mechanical Layout:
This model features a 12-volt electrical system, standard rear differential lock, and was offered with multiple transmission options providing up to 12 forward and 4 reverse speeds.
Production
| Description | Utility tractor / Built in Meltham Mills, Huddersfield, England |
|---|---|
| Manufacturer | David Brown |
| Original price | $4,000 (1971) |
Engine
| Engine type | David Brown 2.4L 3-cyl gasoline |
|---|---|
| Air cleaner | oil bath |
| Bore/Stroke | 3.939x4.000 inches (100 x 102 mm) |
| Compression | 6.75:1 |
| Coolant capacity | 9 qts (8.5 L) |
| Description | David Brown / gasoline / 3-cylinder / liquid-cooled |
| Displacement | 146.1 ci (2.4 L) |
| Oil capacity | 6.75 qts (6.4 L) |
| Operating RPM | 700-2200 |
| Rated RPM | 2200 |
| Starter volts | 12 |
| Torque | 115 lb-ft (155.9 Nm) |
| Torque RPM | 1400 |
| Drawbar (tested) | 32.13 hp (24.0 kW) |
| PTO (claimed) | 39 hp (29.1 kW) |
| PTO (tested) | 39.16 hp (29.2 kW) |
Transmission
| Clutch | dry disc / dry disc |
|---|---|
| Gears | 6 forward and 2 reverse / 12 forward and 4 reverse |
| Oil capacity | 24 qts (22.7 L) / 24 qts (22.7 L) |
| Type | gear / gear |
| Transmission type | 6-speed gear / 12-speed gear |
| Transmission type | 6-speed gear / 12-speed gear |
Mechanical
| Description | Mechanical shoe brakes / Open operating station. |
|---|---|
| Differential lock | rear diff lock standard |
| Drive type | Two-wheel drive |
| Final drives | spur gear |
| Steering | manual |
Capacity
| Fuel | 9.5 gal (36.0 L) |
|---|---|
| Hydraulic system | 6 gal (22.7 L) |
Hydraulics
| Capacity | 6 gal (22.7 L) |
|---|---|
| Pressure | 2000 psi (137.9 bar) |
| Pump flow | 7.3 gpm (27.6 lpm) |
| Type | Selectamatic |
Hitch
| Control | position and draft control |
|---|---|
| Rear lift (at ends) | 1600 lbs (working) (725 kg) |
| Rear Type | I |
PTO
| Rear PTO | live |
|---|---|
| Rear PTO Type | 540/1000 |
Dimensions & Tires
| Ag front | 6.00-16 / 14.9/13-24 |
|---|---|
| Ag rear | 13.6/12-28 |
| Ballasted weight | 5835 lbs (2646 kg) |
| Clearance (drawbar) | 11.75 inches (29 cm) |
| Clearance (front axle) | 17.5 inches (44 cm) |
| Front tread | 48 to 72 inches (121 to 182 cm) |
| Height (hood) | 51.25 inches (130 cm) |
| Length | 115.625 inches (293 cm) |
| Operating weight | 3885 lbs (1762 kg) |
| Rear tread | 48 to 76 inches (121 to 193 cm) / 60 to 80 inches (PAVT) (152 to 203 cm) |
| Wheelbase | 76 inches (193 cm) |
| Width | 64.5 inches (min) (163 cm) |
| Front tire | 6.00-16 |
| Rear tire | 13.6/12-28 |
| Weight | 3885 lbs (1762 kg) |
| Wheelbase | 76 inches (193 cm) |
Nebraska Tractor Test 1018
| Description | Gasoline 6-speed 2WDSeptember 2 - 11, 1969Link: Nebraska Tractor Test 1018 file / PTO performance / Drawbar performance / Gear 3 used for power test. / Gear 1 used for pull test. |
|---|---|
| Fuel use | 3.6 gal/hour (13.6 l/hour) / 3.3 gal/hour (12.5 l/hour) / 3.4 gal/hour (12.9 l/hour) |
| Max power | 32.13 hp (24.0 kW) |
| Max pull | 4419 lbs (2004 kg) |
| Power at rated engine speed | 39.16 hp (29.2 kW) |
| Power at rated PTO speed | 37.24 hp (27.8 kW) |