| Manufacturer | Allis Chalmers |
| Price | 1,785(USD) |
| Model | 18-30 |
| Equipment Type | Standard-Tread Tractors |
| Factory | West Allis, Wisconsin, USA |
NEBRASKA TRACTOR TEST 55
| Description | Gasoline 2-speed 2WD/August 23 - September 6, 1920/Link: Nebraska Tractor Test 55 file/Drawbar performance |
| Belt power (max) | 33.41 hp/24.9 kW |
| Belt fuel use (max) | 4.6 gal/hour/17.4 l/hour |
| Max power | 20.55 hp/15.3 kW |
| Fuel use | 3.5 gal/hour/13.2 l/hour |
| Max pull | 3,500 lbs/1587 kg |
ALLIS CHALMERS 18-30 POWER
| Drawbar (claimed) | 18 hp/13.4 kW |
| Belt (claimed) | 30 hp/22.4 kW |
| Plows | 3 |
| Drawbar (tested) | 20.55 hp/15.3 kW |
| Belt (tested) | 33.41 hp/24.9 kW |
ENGINE DETAIL
The Allis Chalmers 18-30 features a robust 4-cylinder, liquid-cooled engine with a displacement of 460.7 ci, providing substantial torque for agricultural tasks. Its oil bath air cleaner supports optimal airflow, enhancing engine longevity, while a rated RPM of 830 allows for effective low-end power delivery, fitting applications like plowing and tilling. However, the combination of a large bore/stroke (4.75 x 6.50 inches) and high displacement may contribute to increased fuel consumption; owners should be prepared for potential operational costs.
| Description | Allis Chalmers/gasoline/4-cylinder/liquid-cooled vertical valve-in-head |
| Displacement | 460.7 ci/7.6 L |
| Bore/Stroke | 4.75x6.50 inches/121 x 165 mm |
| Fuel system | Kingston L 1.5 |
| Air cleaner | oil bath |
| Rated RPM | 830 |
| Coolant capacity | 40 qts/37.9 L |
ALLIS CHALMERS 18-30 ENGINE
The Allis Chalmers 18-30 features a robust 7.6L 4-cylinder gasoline engine, providing a balance of power and efficiency for medium-duty agricultural tasks. With a fuel tank capacity of 25 gallons and an auxiliary tank of 7.75 gallons, it allows for extended operation without frequent refueling, which is ideal for large fields. However, the reliance on gasoline may limit its fuel economy compared to diesel-powered competitors, presenting a trade-off between power output and operational efficiency.
| Description | Allis Chalmers 7.6L 4-cyl gasoline |
| Fuel tank | 25 gal/94.6 L |
| Aux. fuel | 7.75 gal/29.3 L |
TRANSMISSION
The Allis Chalmers 18-30 tractor features an unsynchronized transmission with two forward gears and one reverse gear, which can limit smooth shifting, particularly under load. The hand-operated expanding shoe clutch provides a straightforward engagement mechanism but may require more effort and skill to operate compared to modern hydraulic systems. This setup is ideal for vintage agricultural tasks, but operators should be prepared for a steeper learning curve in managing gear engagement and clutch operation for optimal performance.
| Type | unsynchronized gear |
| Gears | 2 forward and 1 reverse |
| Clutch | hand-operated expanding shoe |
MECHANICAL
The Allis Chalmers 18-30 features a 4x2 2WD chassis, providing basic traction and is well-suited for flat terrain or light agricultural tasks. The open operator station enhances operator visibility and comfort in warm conditions but may expose the driver to elements. The 2-speed unsynchronized gear transmission allows for straightforward operation, yet may require skillful gear shifting when navigating varied workloads.
| Chassis | 4x2 2WD |
| Cab | Open operator station. |
| Transmission | 2-speed unsynchronized gear |
ALLIS CHALMERS 18-30 TIRES
The Allis Chalmers 18-30's specifications highlight its robust configuration with 36x6 steel front wheels and 50x12 steel rear wheels, offering enhanced stability and traction in agricultural applications. The tractor's ability to support heavy loads makes it advantageous for plowing and cultivating large fields, although the steel wheels may pose challenges in terms of soil compaction and reduced mobility on softer terrains. Operators should consider utilizing wider tires if operating in varied soil conditions to improve flotation and minimize damage to the land.
| Ag front | 36x6 steel |
| Ag rear | 50x12 steel |
DIMENSIONS
| Length | 135 inches/342 cm |
| Width | 66 inches/167 cm |
| Height | 68 inches/172 cm |
| Weight | 6150 lbs/2789 kg |
DIMENSIONS & TIRES
The Allis Chalmers 18-30 tractor, weighing 6,150 lbs (2,789 kg), provides excellent stability and traction, particularly in agricultural applications. The front tire size of 36x6 enhances maneuverability, while the large rear tires (50x12) optimize power transfer, making it well-suited for plowing and fieldwork. However, the heavier weight may challenge transportability, especially on uneven terrain.
| Weight | 6150 lbs/2789 kg |
| Front tire | 36x6 |
| Rear tire | 50x12 |
18-30 SERIAL NUMBERS
| Location | front of shifter on transmission case |
| 1919 | 5000 |
| ---- | 5006 |
| 1920 | 5161 |
| 1921 | 6015 |
| 1922 | ???? |
BELT PULLEY
| Diameter | 13 inches/33 cm |
| Width | 8.5 inches/21 cm |
| RPM | 930 |