Overview
The Best Thirty is a gasoline-powered crawler tractor produced in San Leandro, California, between 1921 and 1925. It features a 7.6L 4-cylinder liquid-cooled engine and was tested with both 2-speed and 3-speed gear transmission configurations across three Nebraska Tractor Tests.
Ideal Applications
Tested Power Output:
According to Nebraska Tractor Test 104, the unit achieved a maximum belt power of 37.83 hp and a maximum drawbar pull of 7,563 lbs.
Mechanical Configuration:
The tractor is equipped with an open operator station, a 12-inch diameter belt pulley rotating at 800 RPM, and a track-based drive system.
Implement Capacity:
The manufacturer specifications list this crawler model with a capacity for 4 plows based on its 7.6L engine and tested drawbar performance.
Production
| Description | Agricultural Crawler tractor / Built in San Leandro, California, USA |
|---|---|
| Manufacturer | Best |
Engine
| Engine type | Best 7.6L 4-cyl gasoline |
|---|---|
| Bore/Stroke | 4.75x6.50 inches (121 x 165 mm) |
| Description | Best / gasoline / 4-cylinder / liquid-cooled |
| Displacement | 461 ci (7.6 L) |
| Rated RPM | 850 |
| Belt (tested) | 37.83 hp (28.2 kW) |
| Drawbar (tested) | 33.21 hp (24.8 kW) |
| Plows | 4 |
Transmission
| Gears | 2 forward and 1 reverse / 3 forward and 1 reverse |
|---|---|
| Type | gear / gear |
| Transmission type | 2-speed gear / 3-speed gear |
| Transmission type | 2-speed gear / 3-speed gear |
Mechanical
| Cab | Open operator station. |
|---|---|
| Drive | crawler |
Dimensions & Tires
| Height | 59 inches (149 cm) |
|---|---|
| Weight | 7400 lbs (3356 kg) |
| Width | 53.25 inches (135 cm) |
Belt Pulley
| Diameter | 12 inches (30 cm) |
|---|---|
| RPM | 800 |
| Speed | 2513 ft/min (765.96 meters/min) |
| Width | 7 inches (17 cm) |
Dimensions & Tracks
| Description | Tracks |
|---|---|
| Weight | 7400 lbs (3356 kg) |
Nebraska Tractor Test 104
| Belt power (max) | 37.83 hp (28.2 kW) |
|---|---|
| Description | Drawbar performance |
| Max power | 33.21 hp (24.8 kW) |
| Max pull | 7563 lbs (3430 kg) |
| Transmission type | 3-speed crawlerSeptember 15 - 22, 1924Link: Nebraska Tractor Test 104 file |
Nebraska Tractor Test 77
| Belt power (max) | 30.43 hp (22.7 kW) |
|---|---|
| Description | Drawbar performance |
| Max power | 24.53 hp (18.3 kW) |
| Max pull | 4343 lbs (1969 kg) |
| Transmission type | 2-speed crawlerMay 9 - 20, 1921Link: Nebraska Tractor Test 77 file |
Nebraska Tractor Test 99
| Belt power (max) | 32.55 hp (24.3 kW) |
|---|---|
| Description | Drawbar performance |
| Max power | 25.96 hp (19.4 kW) |
| Max pull | 4930 lbs (2236 kg) |
| Transmission type | 2-speed crawlerSeptember 11 - 24, 1923Link: Nebraska Tractor Test 99 file |
Tractor Tests
| Description | NTTL 77: 2-speed crawler / NTTL 99: 2-speed crawler / NTTL 104: 3-speed crawler |
|---|