| Manufacturer |
Oliver |
| Price |
3,000(USD) |
| Model |
77 |
| Equipment Type |
Row-Crop Tractors |
| Factory |
Charles City, Iowa, USA |
NEBRASKA TRACTOR TEST 404 2
| Description |
Gasoline 6-speed 2WD/October 21 - November 9, 1948/Link: Nebraska Tractor Test 404 file/Drawbar performance/Gear 3 used for power test./Gear 1 used for pull test. |
| Belt power (max) |
33.98 hp/25.3 kW |
| Belt fuel use (max) |
3.0 gal/hour/11.4 l/hour |
| Max power |
28.68 hp/21.4 kW |
| Max pull |
4,076 lbs/1848 kg |
NEBRASKA TRACTOR TEST 425 2
| Description |
Gasoline 6-speed 2WD/September 23 - 29, 1949/Link: Nebraska Tractor Test 425 file/Drawbar performance/Gear 3 used for power test. |
| Belt power (max) |
37.17 hp/27.7 kW |
| Belt fuel use (max) |
3.5 gal/hour/13.2 l/hour |
| Max power |
32.89 hp/24.5 kW |
| Max pull |
4,714 lbs/2138 kg |
NEBRASKA TRACTOR TEST 457 2
| Description |
Diesel 6-speed 2WD/May 21 - 28, 1951/Link: Nebraska Tractor Test 457 file/Drawbar performance/Gear 3 used for power test./Gear 1 used for pull test. |
| Belt power (max) |
35.79 hp/26.7 kW |
| Belt fuel use (max) |
2.5 gal/hour/9.5 l/hour |
| Max power |
30.43 hp/22.7 kW |
| Max pull |
4,818 lbs/2185 kg |
NEBRASKA TRACTOR TEST 470 2
| Description |
LP gas 6-speed 2WD/April 28 - May 10, 1952/Link: Nebraska Tractor Test 470 file/Drawbar performance/Gear 3 used for power test./Gear 1 used for pull test. |
| Belt power (max) |
36.33 hp/27.1 kW |
| Belt fuel use (max) |
4.6 gal/hour/17.4 l/hour |
| Max power |
32.26 hp/24.1 kW |
| Max pull |
4,778 lbs/2167 kg |
OLIVER 77 POWER
| Plows |
2-3 |
| Drawbar (tested) |
32.89 hp/24.5 kW |
| Belt (tested) |
37.17 hp/27.7 kW |
ENGINES OVERVIEW
The Oliver 77 tractor features a versatile Waukesha-Oliver 3.2L 6-cylinder engine available in gasoline, diesel, and LP gas variants, ensuring adaptability to different fuel preferences and operational needs. Key advantages include improved torque and reliability in various agricultural applications, while potential challenges may involve parts availability for older models and fuel efficiency depending on engine type. Scenario-wise, the LP gas version is ideal for environments requiring cleaner emissions, while the diesel variant provides enhanced torque for heavy-duty tasks.
| Description |
Waukesha-Oliver 3.2L 6-cyl gasoline/Waukesha-Oliver 3.2L 6-cyl diesel/Waukesha-Oliver 3.2L 6-cyl LP gas |
ENGINE DETAIL 1
The Oliver 77 features a Waukesha 6-cylinder gasoline engine with a moderate displacement of 193.9 ci (3.2 L), enabling efficient operation at a rated RPM of 1600. The oil bath air cleaner and a compression ratio of 6.75:1 contribute to its reliability in varied operating conditions, though the low compression may limit power output for heavier tasks. Ideal for small to medium agricultural applications, the tractor’s oil and coolant capacities (8 qts and 13.5 qts respectively) support extended run times but may require more frequent servicing compared to modern solutions.
| Description |
Waukesha-Oliver/gasoline/6-cylinder/liquid-cooled vertical I-head |
| Displacement |
193.9 ci/3.2 L |
| Bore/Stroke |
3.3125x3.75 inches/84 x 95 mm |
| Air cleaner |
oil bath |
| Compression |
6.75:1 |
| Rated RPM |
1600 |
| Firing order |
1-5-3-6-2-4 |
| Oil capacity |
8 qts/7.6 L |
| Coolant capacity |
13.5 qts/12.8 L |
ENGINE DETAIL 2
The Oliver 77 tractor is powered by a Waukesha 6-cylinder diesel engine with a robust 15.75:1 compression ratio, providing efficient fuel combustion and enhanced torque performance at a rated RPM of 1600. The oil bath air cleaner contributes to improved engine longevity by trapping contaminants, while the liquid cooling (18 quarts capacity) effectively manages operating temperatures, reducing the risk of overheating during demanding tasks. Its firing order (1-5-3-6-2-4) ensures smooth operation, though in scenarios requiring rapid cylinder firing adjustments, maintenance of the ignition system could be crucial to avoid misfiring issues.
| Description |
Waukesha-Oliver/diesel/6-cylinder/liquid-cooled vertical I-head |
| Displacement |
193.9 ci/3.2 L |
| Bore/Stroke |
3.3125x3.75 inches/84 x 95 mm |
| Air cleaner |
oil bath |
| Compression |
15.75:1 |
| Rated RPM |
1600 |
| Firing order |
1-5-3-6-2-4 |
| Starter volts |
12 |
| Coolant capacity |
18 qts/17.0 L |
ENGINE DETAIL 3
The Oliver 77 tractor, powered by a 6-cylinder Waukesha-Oliver LP gas engine, boasts a displacement of 193.9 ci (3.2 L), providing robust torque suitable for moderate agricultural tasks. Its oil bath air cleaner enhances engine longevity by effectively trapping particulates, while the low compression ratio of 6.75:1 allows for stable ignition with LP gas but may limit maximum power output compared to higher-ratio alternatives. Operating at a rated RPM of 1600 and compatible with a 6-volt starter, this tractor is ideal for farmers needing reliable performance in less demanding environments, although its lower RPM may restrict high-speed operations.
| Description |
Waukesha-Oliver/LP gas/6-cylinder/liquid-cooled |
| Displacement |
193.9 ci/3.2 L |
| Bore/Stroke |
3.3125x3.75 inches/84 x 95 mm |
| Air cleaner |
oil bath |
| Compression |
6.75:1 |
| Rated RPM |
1600 |
| Starter volts |
6 |
| Coolant capacity |
18 qts/17.0 L |
OLIVER 77 ENGINES
The Oliver 77 tractor is powered by a versatile Waukesha-Oliver 3.2L 6-cylinder engine available in gasoline, diesel, or LP gas configurations, offering flexibility depending on fuel availability and performance preference. Its 16.5-gallon fuel tank enables extended operation, making it suitable for medium to heavy agricultural tasks without frequent refueling interruptions. However, the choice of fuel type can affect the engine's efficiency and maintenance needs, with diesel offering better torque and lifespan but potentially higher initial costs.
| Description |
Waukesha-Oliver 3.2L 6-cyl gasoline/Waukesha-Oliver 3.2L 6-cyl diesel/Waukesha-Oliver 3.2L 6-cyl LP gas |
| Fuel tank |
16.5 gal/62.5 L |
TRANSMISSION
The Oliver 77 features an unsynchronized gear system, which limits smooth shifting between gears, particularly during operation under load. With 6 forward and 2 reverse gears, it offers versatility for various agricultural tasks but may require operator skill for optimal performance. The dry disc clutch enhances durability but can lead to abrupt engagement if not properly managed, necessitating routine maintenance for efficient operation.
| Type |
unsynchronized gear |
| Gears |
6 forward and 2 reverse |
| Clutch |
dry disc |
MECHANICAL
The Oliver 77 tractor features a 4x2 2WD chassis that provides sufficient traction for basic agricultural tasks but may struggle on uneven terrain. The manual steering system offers a simple and reliable operation, though it requires more physical effort compared to power steering. With its 6-speed unsynchronized gearbox, operators may face challenges in shifting smoothly under load, making it ideal for straightforward applications but less suitable for operations requiring frequent gear changes.
| Chassis |
4x2 2WD |
| Steering |
manual |
| Brakes |
differential mechanical drum |
| Cab |
Open operator station. |
| Transmission |
6-speed unsynchronized gear |
POWER TAKE-OFF (PTO)
OLIVER 77 TIRES
The Oliver 77 tractor features a front tire size of 5.50-16 and rear options of 10-38, 11-38, or 12-38, which optimize its versatility for various agricultural tasks. The larger rear tires enhance traction and stability, making this tractor suitable for plowing and heavy tillage in diverse soil conditions. However, the choice of rear tire width can impact maneuverability and soil compaction, so it's crucial to select based on specific crop requirements and field conditions.
| Ag front |
5.50-16 |
| Ag rear |
10-38/11-38/12-38 |
DIMENSIONS
| Wheelbase |
90.75 inches/230 cm |
| Length |
139.25 inches/353 cm |
| Height |
75 inches/190 cm |
| Ground clearance |
24.9 inches/63 cm |
| Front tread |
60 to 89.75 inches/152 to 227 cm (wide-front) |
| Rear tread |
60 to 92.5 inches/152 to 234 cm |
OLIVER 77 WEIGHT
| Operating |
4,207 lbs/1908 kg (gas)/4,502 lbs/2042 kg (diesel) |
| Ballasted |
8,203 lbs/3720 kg |
DIMENSIONS & TIRES
The Oliver 77 features a wheelbase of 90.75 inches, which contributes to its stability during field operations, making it suitable for moderate tillage tasks. Weighing between 4207 to 4502 pounds, its weight can enhance traction on varied terrains but may limit maneuverability in tighter spaces. The tire specifications (5.50-16 front and 10-38 rear) provide a balance of load capacity and flotation, although tire wear can be a concern depending on soil conditions and usage intensity.
| Wheelbase |
90.75 inches/230 cm |
| Weight |
4207 to 4502 pounds |
| Front tire |
5.50-16 |
| Rear tire |
10-38 |
77 SERIAL NUMBERS
| Location |
early: rear main frame and transmission, front-right side/later: below instrument panel |
| 1948 |
320001 |
| 1949 |
320241 |
| 1950 |
327901 |
| 1951 |
337243 |
| 1952 |
347904 |
| 1953 |
3500001 |
| 1954 |
4501667 |
| Final |
4504470 |
BELT PULLEY
| Diameter |
12 inches/30 cm |
| Width |
7.25 inches/18 cm |
| RPM |
992 |
| Speed |
3,080 ft/min/938.78 meters/min |
