| Manufacturer | J.I. Case |
| Price | 6,900(USD) |
| Model | 731 |
| Equipment Type | Row-Crop Tractors |
| Factory |
VARIANTS
| 732 | Western Special diesel |
| 733 | high-clearance diesel |
| 734 | orchard diesel |
| 740 | row-crop gas |
| 742 | Western Special gas |
| 743 | high-clearance gas |
| 744 | orchard gas |
NEBRASKA TRACTOR TEST 742 2
| Description | Diesel Case-O-Matic 2WD April 19 - May 6, 1960 Link: Nebraska Tractor Test 742 file PTO performance Drawbar performance Gear 4 used for power test. Gear 2-Torque used for pull test |
| Power at rated engine speed | 56.50hp / 42.1kW |
| Fuel use | 4.2gal/hour / 15.9l/hour |
| Power at rated PTO speed | 53.46hp / 39.9kW |
| Max power | 48.31hp / 36.0kW |
| Max pull | 7362lbs / 3339kg |
NEBRASKA TRACTOR TEST 743 2
| Description | Diesel 8-speed 2WD April 21 - May 6, 1960 Link: Nebraska Tractor Test 743 file PTO performance Drawbar performance Gear 4 used for power test. Gear 2 used for pull test |
| Power at rated engine speed | 56.43hp / 42.1kW |
| Fuel use | 3.8gal/hour / 14.4l/hour |
| Max power | 48.33hp / 36.0kW |
| Max pull | 7531lbs / 3416kg |
J.I. CASE 731 POWER
| Plows | 5 |
| Drawbar (tested) | 48.33hp / 36.0kW |
| PTO (tested) | 56.50hp / 42.1kW |
ENGINE DETAIL
The J.I. Case 731 tractor features a robust 4-cylinder diesel engine with a displacement of 4.4L and a high compression ratio of 15.2:1, providing good torque for heavy-duty applications. Its dual-range RPM capability of 1700/1900 allows for versatility in various operational scenarios, though lower RPMs may limit high-speed applications. The oil bath air cleaner enhances filtration efficiency, reducing maintenance frequency—ideal for users in dusty environments, but the 7.5qt coolant capacity may necessitate regular monitoring during extended operations to prevent overheating.
| Description | J.I. Case diesel 4-cylinder liquid-cooled |
| Displacement | 267ci / 4.4L |
| Bore/Stroke | 4.125x5.00inches / 105x 127 mm |
| Air cleaner | oil bath |
| Compression | 15.2:1 |
| Rated RPM | 1700 (Dual-Range)/1900 (Case-o-Matic) |
| Starter volts | 12 |
| Coolant capacity | 7.5qts / 7.1L |
J.I. CASE 731 ENGINE
The J.I. Case 731 tractor features a robust 4.4L 4-cylinder diesel engine, providing adequate torque for various agricultural tasks. With a 22-gallon (83.3L) fuel tank, it offers extended operational periods, reducing downtime during fieldwork. Challenges may include ensuring proper fuel filtration to prevent injector clogging, especially in dusty conditions.
| Description | J.I. Case 4.4L 4-cyl diesel |
| Fuel tank | 22gal / 83.3L |
TRANSMISSIONS OVERVIEW
The J.I. Case 731 tractor features an 8-speed torque converter and an 8-speed unsynchronized transmission, offering a smooth power delivery and enhanced torque multiplication, which is advantageous in heavy-duty applications like plowing or hauling. However, the unsynchronized transmission may present shifting challenges under load, requiring skillful operation to avoid gear grinding. This model is ideal for users seeking versatility in varying field conditions but may not suit operators preferring straightforward gear changes.
| Description | 8-speed torque converter 8-speed unsynchronized |
TRANSMISSION 1
The J.I. Case 731 tractor features a Case-o-matic transmission utilizing a torque converter, which provides seamless power transfer and eliminates the need for a clutch, enhancing operator comfort. With 8 forward and 2 reverse gears, it offers versatility for various field applications, although the complexity of the system may lead to higher maintenance requirements. This setup is particularly advantageous in tasks requiring constant speed variation, such as plowing or hauling, improving overall productivity.
| Transmission | Case-o-matic |
| Type | torque converter |
| Gears | 8 forward and 2 reverse |
TRANSMISSION 2
The J.I. Case 731 tractor features an unsynchronized dual-range transmission with 8 forward and 2 reverse gears, allowing for flexibility in various terrain conditions. The mechanical dry disc clutch provides durability but may require more driver skill for smooth gear transitions compared to synchronized systems. While it is advantageous for straightforward agricultural tasks, the lack of synchronization can pose challenges in precision applications or during gear shifts under load.
| Transmission | Dual-Range |
| Type | unsynchronized |
| Gears | 8 forward and 2 reverse |
| Clutch | mechanical dry disc |
MECHANICAL
The J.I. Case 731 tractor features a 4x2 2WD chassis, which offers simplicity and lower maintenance costs but can limit traction in challenging conditions. The optional power steering enhances ease of maneuverability, particularly during extended operations, while the manual steering might pose a challenge for prolonged use. With an 8-speed torque converter transmission, the tractor provides smooth power delivery for varied tasks, though the 8-speed unsynchronized option may require skillful shifting for optimal performance.
| Chassis | 4x2 2WD |
| Steering | manual/power optional |
| Brakes | differential disc |
| Cab | Open operator station. |
| Transmissions | 8-speed torque converter/8-speed unsynchronized |
HYDRAULICS
| Type | open center |
| Valves | 1 |
TRACTOR HITCH
| Rear Type | II |
| Type | Case Eagle Hitch |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Rear RPM | 540/1000 |
J.I. CASE 731 TIRES
The J.I. Case 731 tractor features Ag front tires sized 6.00-16 and Ag rear tires 13.6-38, which provide a balance between stability and traction, crucial for effective fieldwork. The rear tire size contributes to optimal power transfer and enhances load-bearing capability, while the front tire size aids in maneuverability. However, the limited tire size options may restrict performance in extremely soft or muddy conditions; thus, careful consideration of soil type is essential for maximizing efficiency and minimizing slippage.
| Ag front | 6.00-16 |
| Ag rear | 13.6-38 |
DIMENSIONS
| Wheelbase | 83inches / 210cm |
| Operating weight | 7,095lbs / 3218kg |
| Ballasted weight | 9,525lbs / 4320kg |
DIMENSIONS & TIRES
The J.I. Case 731 tractor features an 83-inch wheelbase, enhancing its maneuverability in tight spaces or uneven terrain, yet it can impact stability when handling heavy loads. Weighing 7,095 lbs/3,218 kg, it offers substantial traction but may require adequate towing capacity for transport. The front tire (6.00-16) and rear tire (13.6-38) sizes support agricultural versatility, suitable for various implements but consider terrain type to optimize performance and reduce wear.
| Wheelbase | 83inches / 210cm |
| Weight | 7,095lbs / 3218kg |
| Front tire | 6.00-16 |
| Rear tire | 13.6-38 |
731 SERIAL NUMBERS
| Location | Plate on instrument panel |
| 1960 | 8160001 |
| 1961 | 8168801 |
| 1962 | 8190001 |
| 1963 | 9208001 |
| 1964 | 8229001 |
| 1965 | 8253501 |
| 1966 | 8279001 |
| 1967 | 8306501 |
| 1968 | 8332101 |
| 1969 | 8356251 |