| Manufacturer | Rumely |
| Price | - |
| Model | OilPull L 15/25 |
| Equipment Type | Standard-Tread Tractors |
| Factory | La Porte, Indiana |
NEBRASKA TRACTOR TEST 112
| Description | Kerosene 3-speed 2WD/March 29, 1925/ - April 16, 1925/Link: Nebraska Tractor Test 112 file/Drawbar performance/Gear 1 used for power test./Gear 2 used for pull test. |
| Belt power (max) | 30.52 hp/22.8 kW |
| Belt fuel use (max) | 3.6 gal/hour/13.6 l/hour |
| Max power | 19.34 hp/14.4 kW |
| Max pull | 3327 lbs/1509 kg |
ADVANCE-RUMELY OILPULL L 15/25 POWER
| Drawbar (claimed) | 15 hp/11.2 kW |
| Belt (claimed) | 25 hp/18.6 kW |
| Drawbar (tested) | 19.34 hp/14.4 kW |
| Belt (tested) | 30.52 hp/22.8 kW |
ENGINE DETAIL
The Rumely OilPull L 15/25 features a 6.1 L displacement, 2-cylinder kerosene engine that delivers its rated power at a low 755 RPM, enabling efficient torque output for heavy-duty tasks. With a considerable bore and stroke ratio of 5.8125 x 7.00 inches, it balances high torque at lower RPMs, beneficial for plowing and towing applications. However, its lower RPM operation may result in limited speed efficiency for transport tasks, necessitating careful consideration of its use case.
| Description | Rumley/kerosene/2-cylinder/liquid-cooled horizontal |
| Displacement | 371.5 ci/6.1 L |
| Bore/Stroke | 5.8125x7.00 inches/148 x 178 mm |
| Rated RPM | 755 |
| Coolant capacity | 40 qts/37.9 L |
ADVANCE-RUMELY OILPULL L 15/25 ENGINE
The Rumely OilPull L 15/25 features a 6.1L two-cylinder kerosene engine, providing efficient fuel combustion and lower operational costs compared to gasoline tractors. Its 18.25-gallon main fuel tank ensures extended running times, ideal for heavy agricultural tasks, while the auxiliary 1.25-gallon tank can facilitate easier starting in colder conditions. However, the heavier kerosene fuel may present challenges in cold weather scenarios, requiring additional operational adjustments.
| Description | Rumley 6.1L 2-cyl kerosene |
| Fuel tank | 18.25 gal/69.1 L |
| Aux. fuel | 1.25 gal/4.7 L |
TRANSMISSION
The Rumely OilPull L 15/25 features a simple three forward and one reverse gear configuration, providing ease of use but limited speed range options. The dry disc clutch enhances reliability and maintenance simplicity, yet may require more driver skill for smooth engagement compared to hydraulic clutches. Ideal for light agricultural tasks, this tractor may struggle with heavy loads or steep terrains due to its design limitations.
| Type | gear |
| Gears | 3 forward and 1 reverse |
| Clutch | dry disc |
MECHANICAL
The Rumely OilPull L 15/25 tractor features a 4x2 2WD chassis, providing a simplified drivetrain that enhances maneuverability on level terrain, but may struggle in muddy or uneven conditions. Its mechanical rear differential lock ensures improved traction under challenging conditions, while the manual steering offers direct control but requires greater operator effort compared to power-assisted systems. With a 3-speed transmission, this tractor is versatile for a range of applications, but may lack the speed range for high-efficiency tasks compared to modern counterparts.
| Chassis | 4x2 2WD |
| Differential lock | mechanical rear |
| Steering | manual |
| Cab | Open operator station. |
| Transmission | 3-speed gear |
ADVANCE-RUMELY OILPULL L 15/25 TIRES
The Rumely OilPull L 15/25 features robust steel wheels, with a 30x6 dimension for the front and a 44x12 dimension for the rear, offering enhanced durability and traction in challenging agricultural environments. The steel construction can provide significant weight for better ground grip but may lead to increased soil compaction, challenging for crop health. Additionally, the model's oil-pulling engine design allows for efficient fuel utilization, promoting long operating hours on the field, albeit with a reliance on specific fuel types.
| Ag front | 30x6 (steel) |
| Ag rear | 44x12 (steel) |
DIMENSIONS
| Length | 136 inches/345 cm |
| Width | 55.75 inches/141 cm |
| Height | 90.5 inches/229 cm |
| Weight | 5,900 lbs/2676 kg |
DIMENSIONS & TIRES
The Rumely OilPull L 15/25, weighing 5,900 lbs (2676 kg), features front tires measuring 30x6 inches and rear tires at 44x12 inches, optimizing traction and stability in various agricultural tasks. Its notable design enables efficient power delivery thanks to the oil engine, but this can be challenging in terms of maintenance due to the complexity of early oil-burning technology. Ideal for powering implements in moderate field conditions, this tractor suits collectors and vintage enthusiasts, although parts and support may be difficult to find.
| Weight | 5,900 lbs/2676 kg |
| Front tire | 30x6 |
| Rear tire | 44x12 |
OILPULL L 15/25 SERIAL NUMBERS
| 1924 | 1 |
| 1925 | 11 |
| 1926 | 1607 |
| 1927 | 4214 |