| Manufacturer |
McCormick-Deering |
| Price |
- |
| Model |
AW-7 |
| Equipment Type |
Standard-Tread Tractors |
| Factory |
Geelong, Australia |
VARIANTS
MCCORMICK-DEERING AW-7 POWER
| Drawbar (claimed) |
44.6 hp/33.3 kW |
| Belt (claimed) |
48.8 hp/36.4 kW |
ENGINES OVERVIEW
The McCormick-Deering AW-7 features a robust International Harvester 4.3L 4-cylinder engine available in both diesel and kerosene variants, offering versatility based on fuel availability and operational costs. The diesel version provides higher torque and improved fuel efficiency, ideal for heavy-duty agricultural tasks, while the kerosene option may allow for lower initial fuel costs but could result in higher maintenance due to combustion byproducts. In scenarios requiring prolonged fieldwork, the diesel engine's durability and efficiency are advantageous, whereas kerosene may be suitable for lighter, less demanding applications.
| Description |
International Harvester 4.3L 4-cyl diesel/International Harvester 4.3L 4-cyl kerosene |
ENGINE DETAIL 1
The McCormick-Deering AW-7 features a robust International Harvester AD-264 diesel engine, delivering a displacement of 4.3 L with a high compression ratio of 16.5:1, optimizing fuel efficiency and torque at low RPM (1450 RPM). Its bore and stroke dimensions (4.00 x 5.25 inches) indicate a long-stroke design, providing enhanced torque characteristics well-suited for heavy-duty agricultural tasks. However, the electric glow-plug preheat system may require careful maintenance to ensure reliable cold-weather starting, a common challenge in diesel engines.
| Description |
International Harvester AD-264/diesel/4-cylinder/liquid-cooled/The AW-7 diesel engine used an electric glow-blub pre-heat system. |
| Displacement |
264 ci/4.3 L |
| Bore/Stroke |
4.00x5.25 inches/102 x 133 mm |
| Compression |
16.5:1 |
| Rated RPM |
1450 |
| Starter volts |
12 |
ENGINE DETAIL 2
The McCormick-Deering AW-7 tractor features a robust 264 ci (4.3 L) four-cylinder kerosene engine, providing an efficient power-to-weight ratio ideal for light agricultural tasks. Its 4.00 x 5.25 inch bore and stroke can lead to enhanced torque delivery, beneficial for plowing and hauling operations. The 6-volt electric starter ensures reliable ignition, though starting performance may decline in colder climates; considering a battery upgrade could mitigate this challenge.
| Description |
International Harvester AC-264/kerosene/4-cylinder/liquid-cooled |
| Displacement |
264 ci/4.3 L |
| Bore/Stroke |
4.00x5.25 inches/102 x 133 mm |
| Starter |
electric |
| Starter volts |
6 |
MCCORMICK-DEERING AW-7 ENGINES
The McCormick-Deering AW-7 is equipped with a robust International Harvester 4.3L 4-cylinder engine, available in both diesel and kerosene variants, providing flexibility in fuel choice. A key advantage of the diesel variant is improved fuel efficiency and torque under load, making it suitable for heavy agricultural tasks; however, the kerosene option offers potential cost benefits in regions where kerosene is cheaper. Challenges may arise in cold starting and maintenance, as the two fuel types require different handling and operational considerations.
| Description |
International Harvester 4.3L 4-cyl diesel/International Harvester 4.3L 4-cyl kerosene |
TRANSMISSION
The McCormick-Deering AW-7 tractor features a gear transmission with 5 forward and 1 reverse gear, providing versatile speed options for various farming activities. This configuration enables efficient operation in different field conditions, but the limited reverse gear may pose challenges when maneuvering in tight spaces. Overall, it is well-suited for cultivating, plowing, and hauling tasks in moderate-sized agricultural operations.
| Type |
gear |
| Gears |
5 forward and 1 reverse |
MECHANICAL
The McCormick-Deering AW-7 features a 4x2 2WD chassis, which offers simple maintenance and reduced operational complexity, although it may limit traction in challenging terrains. The power-assisted, enclosed worm and gear steering provides ease of maneuverability, mitigating operator fatigue during prolonged use. Its 5-speed gear transmission allows flexibility in speed adjustments, beneficial for various agricultural tasks, but may require more frequent gear engagement compared to modern continuously variable transmissions.
| Chassis |
4x2 2WD |
| Steering |
power assisted, enclosed worm and gear |
| Cab |
Open operator station. |
| Transmission |
5-speed gear |
HYDRAULICS
| Pressure |
1200 psi/82.7 bar |
| Pump flow |
10 gpm/37.9 lpm |
TRACTOR HITCH
POWER TAKE-OFF (PTO)
MCCORMICK-DEERING AW-7 TIRES
The McCormick-Deering AW-7 features substantial tire sizes with 7.50x16 Ag fronts for improved maneuverability and 14.00x30 Ag rears, providing better traction and stability on rough terrain. This configuration enhances the tractor's ability to handle heavier implements, making it suitable for applications in both tillage and hauling. However, operators should consider the potential for increased soil compaction in softer fields due to the larger rear tire footprint.
| Ag front |
7.50x16 |
| Ag rear |
14.00x30 |
DIMENSIONS
| Wheelbase |
76.5 inches/194 cm |
| Length |
125 inches/317 cm |
| Width |
78.75 inches/200 cm |
| Kerosene Weight |
7735 lbs/3508 kg |
| Diesel Weight |
8540 lbs/3873 kg |
DIMENSIONS & TIRES
The McCormick-Deering AW-7 tractor features a wheelbase of 76.5 inches, providing enhanced stability and maneuverability in various agricultural scenarios. Weighing between 7735 to 8540 pounds, it offers significant traction for heavy-duty tasks, though operating in soft or muddy conditions may pose challenges. Its tire specifications, with a narrow front tire of 7.50x16 and a wider rear tire of 14.00x30, are advantageous for optimizing weight distribution and reducing soil compaction while maintaining adequate grip.
| Wheelbase |
76.5 inches/194 cm |
| Weight |
7735 to 8540 pounds |
| Front tire |
7.50x16 |
| Rear tire |
14.00x30 |
AW-7 SERIAL NUMBERS
| 1957 |
1067 (diesel) |
| 1957-Final |
8966 (kerosene) |
| 1958 |
706 (kerosene) |
| 1959 |
1633 (kerosene) |
| 1960 |
2975 (kerosene) |
| Final |
4941 (kerosene) |
| 1958-Final |
1604 (diesel) |
BELT PULLEY
| Diameter |
11 inches/27 cm |
| Width |
7.5 inches/19 cm |
| RPM |
899 |
