| Manufacturer | Massey-Harris |
| Price | 1,000(USD) |
| Model | GP |
| Equipment Type | Four-wheel Drive 4WD Tractors |
| Factory | Racine, Wisconsin, USA |
NEBRASKA TRACTOR TEST 177 2
| Description | Gasoline 3-speed 4WD May 5 - 27, 1930 Link: Nebraska Tractor Test 177 file Drawbar performance Gear 1 used for power test. Gear 1 used for pull test. |
| Belt power (max) | 24.84hp / 18.5kW |
| Belt fuel use (max) | 3.0gal/hour / 11.4l/hour |
| Max power | 19.91hp / 14.8kW |
| Max pull | 3,247lbs / 1472kg |
NEBRASKA TRACTOR TEST 191 2
| Description | Distillate 3-speed 4WD May 22 - June 12, 1931 Link: Nebraska Tractor Test 191 file Drawbar performance Gear 2 used for power test. Gear 1 used for pull test |
| Belt power (max) | 22.50hp / 16.8kW |
| Belt fuel use (max) | 2.9gal/hour / 11.0l/hour |
| Max power | 16.79hp / 12.5kW |
| Max pull | 2,764lbs / 1253kg |
MASSEY-HARRIS GP POWER
| Drawbar (claimed) | 15hp / 11.2kW |
| Belt (claimed) | 22hp / 16.4kW |
| Plows | 2 (14-inch) |
| Drawbar (tested) | 19.91hp / 14.8kW |
| Belt (tested) | 24.84hp / 18.5kW |
ENGINE DETAIL 1
The Massey-Harris GP features a Hercules OOC gasoline engine with a 4-cylinder configuration, providing robust power for agricultural tasks. With a displacement of 226ci and a bore/stroke ratio of 4.00x4.50 inches, it is designed for efficient torque delivery at a rated RPM of 1200, making it well-suited for heavy tillage and pulling operations. Challenges may include managing the oil bath air cleaner in dusty conditions, while its 16qt coolant capacity ensures ample cooling during extended work periods, enhancing durability and performance.
| Description | Hercules OOC gasoline 4-cylinder liquid-cooled vertical L-head |
| Displacement | 226ci / 3.7L |
| Bore/Stroke | 4.00x4.50inches / 102x 114 mm |
| Air cleaner | oil bath |
| Rated RPM | 1200 |
| Coolant capacity | 16qts / 15.1L |
ENGINE DETAIL 2
The Massey-Harris GP tractor features a 226ci Hercules OHV engine, providing better power efficiency and performance compared to its predecessor, the flathead OOC. With a bore and stroke of 4.00x4.50 inches, this engine design allows for increased torque at lower RPMs, making it suitable for extensive field operations. However, the lower rated RPM of 1200 may limit maximum speed in certain applications, thus requiring careful gear selection for optimal work efficiency.
| Description | Hercules OHC gasoline 4-cylinder liquid-cooled The overhead-valve (OHV) Hercules engine replaced the flathead OOC in 1936, the final year of the GP production |
| Displacement | 226ci / 3.7L |
| Bore/Stroke | 4.00x4.50inches / 102x 114 mm |
| Rated RPM | 1200 |
MASSEY-HARRIS GP ENGINE
The Massey-Harris GP features a Hercules 3.7L 4-cylinder gasoline engine, providing a good balance of power and efficiency for agricultural tasks. With a fuel capacity of 14 gallons (53.0L) and an auxiliary tank of 1.6 gallons (6.1L), the tractor can sustain longer operational periods without frequent refueling, though the relatively smaller auxiliary tank might limit extended use without a nearby fuel source. Its gasoline engine may offer advantages in speed and throttle response, but could face challenges in torque output compared to diesel counterparts, which is critical for heavy-duty applications.
| Description | Hercules 3.7L 4-cyl gasoline |
| Fuel tank | 14gal / 53.0L |
| Aux. fuel | 1.6gal / 6.1L |
TRANSMISSION
The Massey-Harris GP tractor features a simple gear transmission system with 3 forward gears and 1 reverse gear, offering basic operational flexibility for various farming tasks. Its limited gear range may pose challenges in managing speed and torque for more demanding applications, particularly in uneven terrain. This tractor is well-suited for light to moderate fieldwork where ease of operation and straightforward maintenance are prioritized.
| Type | gear |
| Gears | 3 forward and 1 reverse |
MECHANICAL
The Massey-Harris GP tractor features a 4x4 4WD chassis, which provides enhanced traction and stability on uneven terrain, making it suitable for diverse agricultural applications. Its open operator station offers better visibility and airflow but may expose the operator to weather conditions. The 3-speed gear transmission allows for versatility in speed management, though it may limit operational efficiency in more demanding tasks requiring precise speed control.
| Chassis | 4x4 4WD |
| Cab | Open operator station |
| Transmission | 3-speed gear |
MASSEY-HARRIS GP TIRES
The Massey-Harris GP tractor is equipped with robust 38x8 steel wheels, providing excellent traction and stability on agricultural terrain. While the steel construction enhances durability, it may lead to increased weight and reduced ride comfort compared to pneumatic tires, potentially impacting maneuverability in softer soils. This tractor is well-suited for heavy-duty agricultural tasks, but operators should be aware of its limitations in terms of ground compaction and ride quality, especially in hilly or uneven fields.
| Ag front | 38x8 steel |
| Ag rear | 38x8 steel |
DIMENSIONS
| Length | 119inches / 302cm |
| Height | 55inches / 139cm |
| Weight | 3,900lbs / 1769kg |
| Ground clearance | 30inches / 76cm |
| Front tread | 76 to inches /193 to 0 cm |
| Rear tread | 76 to inches/193 to 0 cm |
DIMENSIONS & TIRES
The Massey-Harris GP tractor, weighing 3,900 lbs (1,769 kg), features a uniform tire configuration of 38x8 for both front and rear, enhancing stability and traction on various terrain. A potential advantage of this design is improved weight distribution, which can reduce soil compaction and allow for better maneuverability in tight spaces. However, the limited tire size may pose challenges in deeper fieldwork or on uneven surfaces, where larger tires might provide better performance and flotation.
| Weight | 3,900lbs / 1769kg |
| Front tire | 38x8 |
| Rear tire | 38x8 |
GP SERIAL NUMBERS
| Location | Left-rear of tractor frame. |
| 1930 | 300001 |
| 1936 | 303001 |
BELT PULLEY
| Diameter | 12.125inches / 30cm |
| Width | 6.5inches / 16cm |
| RPM | 802 |
| Speed | 2.546ft/min / 0.78 meters/min |