| Manufacturer |
Farmall |
| Price |
- |
| Model |
756 |
| Equipment Type |
Row-Crop Tractors |
| Factory |
|
VARIANTS
NEBRASKA TRACTOR TEST 955 2
| Description |
310 diesel Torque Amplifier 2WD November 14 - 28, 1966 Link: Nebraska Tractor Test 955 file PTO performance Drawbar performance Gear 1-High-Direct used for power test Gear 3-Low-TA used for pull test |
| Power at rated engine speed |
76.09hp / 56.7kW |
| Fuel use |
5.0gal/hour / 18.9l/hour |
| Power at rated PTO speed |
71.84hp / 53.6kW |
| Max power |
67.46hp / 50.3kW |
| Max pull |
8,416lbs / 3817kg |
NEBRASKA TRACTOR TEST 956 2
| Description |
291 LP gas Torque Amplifier 2WD November 14 - 28, 1966 Link: Nebraska Tractor Test 956 file PTO performance Drawbar performance Gear 1-High-Direct used for power test Gear 3-Lo-TA used for pull test |
| Power at rated engine speed |
76.3hp / 56.9kW |
| Fuel use |
8.3gal/hour / 31.4l/hour |
| Power at rated PTO speed |
70.98hp / 52.9kW |
| Max power |
66.53hp / 49.6kW |
| Max pull |
8,387lbs / 3804kg |
NEBRASKA TRACTOR TEST 957 2
| Description |
291 gas Torque Amplifier 2WD November 16 - 28, 1966 Link: Nebraska Tractor Test 957 file PTO performance Drawbar performance Gear 1-High-DD used for power test Gear 3-Low-TA used for pull test |
| Power at rated engine speed |
76.56hp / 57.1kW |
| Fuel use |
6.3gal/hour / 23.8l/hour |
| Power at rated PTO speed |
71.8hp / 53.5kW |
| Max power |
65.67hp / 49.0kW |
| Max pull |
8,387lbs / 3804kg |
FARMALL 756 POWER
| Drawbar (claimed) |
68hp / 50.7kW |
| PTO (claimed) |
76.5hp / 57.0kW |
| Drawbar (tested) |
67.46hp / 50.3kW |
| PTO (tested) |
76.56hp / 57.1kW |
ENGINES OVERVIEW
The Farmall 756 features versatile power options with a choice of a 5.1L diesel engine or two 4.8L gas variants (gasoline and LP gas), allowing farmers to select based on fuel availability and cost efficiency. The diesel model offers improved torque and fuel efficiency, making it ideal for heavy-duty tasks, while the gasoline options are advantageous for lighter operations and easier starting in colder climates. However, potential challenges include the complexity of maintaining the diesel system and the need for proper fuel management in multi-fuel scenarios.
| Description |
International Harvester 5.1L 6-cyl diesel International Harvester 4.8L 6-cyl gasoline International Harvester 4.8L 6-cyl LP gas |
ENGINE DETAIL 1
The Farmall 756 features a robust International Harvester D-310 diesel engine with a high displacement of 310ci (5.1L) and a compression ratio of 16:1, ensuring efficient power delivery at a rated RPM of 2300. The dual dry air cleaner enhances engine protection by minimizing dust intake in field operations. While the substantial oil (12qts) and coolant (23.5qts) capacities support extended operational periods, users should monitor these levels carefully to prevent overheating or lubrication issues under heavy-duty tasks.
| Description |
International Harvester D-310 diesel 6-cylinder liquid-cooled |
| Displacement |
310ci / 5.1L |
| Bore/Stroke |
3.875x4.375inches / 98x 111mm |
| Air cleaner |
dual dry elements |
| Compression |
16:1 |
| Rated RPM |
2300 |
| Starter volts |
12 |
| Oil capacity |
12qts / 11.4L |
| Coolant capacity |
23.5qts / 22.2L |
ENGINE DETAIL 2
The Farmall 756 features a 291ci C-291 gasoline engine, providing ample power with its 7.6:1 compression ratio at a rated RPM of 2300, suitable for various agricultural tasks. With a displacement-to-weight ratio favorable for moderate fieldwork, it's supported by dual dry air cleaners that enhance engine longevity and efficiency. However, the relatively low compression may limit performance in high-demand applications; operators should maintain optimal oil (9 qts) and coolant (20.5 qts) levels to ensure reliability.
| Description |
International Harvester C-291 gasoline 6-cylinder liquid-cooled |
| Displacement |
291ci / 4.8L |
| Bore/Stroke |
3.75x4.39inches / 95x 112mm |
| Air cleaner |
dual dry elements |
| Compression |
7.6:1 |
| Rated RPM |
2300 |
| Starter volts |
12 |
| Oil capacity |
9qts / 8.5L |
| Coolant capacity |
20.5qts / 19.4L |
ENGINE DETAIL 3
The Farmall 756, powered by the International Harvester C-291 LP gas engine, offers a robust 291ci displacement and a balanced bore/stroke ratio, optimizing torque delivery for agricultural applications. With a compression ratio of 7.6:1 and a rated RPM of 2300, it maintains efficiency while maximizing power for fieldwork tasks. Consider the advantages of dual dry air cleaners for enhanced filtration and the need for regular maintenance of oil (9qts) and coolant (21qts) capacities to ensure optimal engine performance and longevity.
| Description |
International Harvester C-291 LP gas 6-cylinder liquid-cooled |
| Displacement |
291ci / 4.8L |
| Bore/Stroke |
3.75x4.39inches / 95x 112mm |
| Air cleaner |
dual dry elements |
| Compression |
7.6:1 |
| Rated RPM |
2300 |
| Starter volts |
12 |
| Oil capacity |
9qts / 8.5L |
| Coolant capacity |
21qts / 19.9L |
FARMALL 756 ENGINES
The Farmall 756 features a robust 5.1L diesel engine or a 4.8L option in gasoline and LP gas variants, providing versatility depending on fuel availability and cost considerations. The tractor's fuel tank capacity of 33 gallons for diesel/gas and 39 gallons for LPG ensures extended operating hours, making it suitable for large-acreage farming. However, the choice of engine type may impact performance efficiency and torque characteristics at different load conditions.
| Description |
International Harvester 5.1L 6-cyl diesel International Harvester 4.8L 6-cyl gasoline International Harvester 4.8L 6-cyl LP gas |
| Fuel tank |
33gal / 124.9L (diesel/gas) 39gal / 147.6L (LPG) |
TRANSMISSIONS OVERVIEW
The Farmall 756 features an 8-speed transmission with an optional 16-speed power shift, enhancing operational efficiency across various field conditions. The two-speed power shift allows for seamless gear changes without clutch engagement, optimizing productivity during tasks such as plowing or hauling. However, the complexity of the transmission system may require advanced maintenance knowledge, presenting a challenge for less experienced operators.
| Description |
8-speed 16-speed two-speed power shift |
TRANSMISSION 1
The Farmall 756 features an 8 forward and 4 reverse gear transmission with a dry disc clutch, offering versatility for various agricultural tasks. Its oil capacity of 68 quarts (64.4 liters) ensures sufficient lubrication for extended operation, but maintenance of the clutch may be critical to prevent premature wear. Ideal for tasks requiring frequent directional changes, the four gears in both high and low ranges enhance its adaptability in diverse field conditions.
| Transmission |
gear |
| Gears |
8 forward and 4 reverse |
| Clutch |
dry disc |
| Oil capacity |
68qts / 64.4L |
| Description |
Four gears each in high, low, and reverse ranges |
SPEEDS 1
| Description |
With 15.5-38 rear tires |
TRANSMISSION 2
The Farmall 756 features a two-speed power shift transmission with 16 forward and 8 reverse gears, enhancing operational flexibility for various agricultural tasks. The Torque Amplifier allows for seamless transitions from direct drive to lower speeds, improving torque delivery and efficiency during load changes, especially in hilly terrain. However, the dry disc clutch may lead to higher maintenance demands and potential slippage under heavy use if not properly managed, highlighting the importance of regular inspection and possible adjustment.
| Transmission |
Torque Amplifier |
| Type |
two-speed power shift |
| Gears |
16 forward and 8 reverse |
| Clutch |
dry disc |
| Oil capacity |
68qts / 64.4L |
| Description |
The Torque Amplifier (TA) provides a power shift from direct drive (DD) to a lower speed for every gear and range |
SPEEDS 2
| Description |
With 15.5-38 rear tires |
MECHANICAL
The Farmall 756 tractor offers versatile drivetrain options with both 2WD and 4WD configurations, enhancing traction and stability in varied terrains. Its hydrostatic power steering provides ease of maneuverability, which is pivotal for operations in tight spaces. The optional cab with heating and A/C increases operator comfort, while the choice of 8-speed or advanced 16-speed two-speed power shift transmissions allows for tailored performance suitable for different farming tasks, though maintenance complexity may increase with more gears.
| Chassis |
4x2 2WD / 4x4 MFWD 4WD |
| Steering |
hydrostatic power |
| Brakes |
independent hydraulic disc |
| Cab |
Cab optional with heat and A/C |
| Transmissions |
8-speed 16-speed two-speed power shift |
TRACTOR HITCH
| Rear Type |
2 |
| Type |
IH Fast Hitch |
POWER TAKE-OFF (PTO)
| Rear PTO |
independent |
| Rear RPM |
1000/540/1000 |
| Engine RPM |
540@2100 / 1000@2100 |
FARMALL 756 TIRES
The Farmall 756 tractor features Ag front tires sized 6.50-16 and Ag rear tires at 15.5-38, providing excellent traction and stability for various field operations. The tire configuration supports optimal weight distribution, enhancing performance in both plowing and hauling scenarios. However, the larger rear tire size may lead to challenges in maneuverability in tighter spaces, necessitating careful navigation in confined areas or during transport.
| Ag front |
6.50-16 |
| Ag rear |
15.5-38 |
DIMENSIONS
| Wheelbase |
105inches / 266cm |
| Length |
164inches / 416cm |
| Width |
92inches / 233cm |
| Height (steering wheel) |
82inches / 208cm |
| Shipping weight |
8,350lbs / 3787kg (diesel) |
DIMENSIONS & TIRES
The Farmall 756 tractor has a wheelbase of 105 inches, providing stability for both field and transport operations. With a weight of 8,350 lbs, it offers sufficient ballast for traction in various tilled soil conditions; however, its heavier build may limit maneuverability in tight spaces. The combination of front tires at 6.50-16 and rear tires at 15.5-38 supports diverse agricultural applications, but tire selection can affect soil compaction and crop damage, necessitating careful consideration based on specific farming goals.
| Wheelbase |
105inches / 266cm |
| Weight |
8,350lbs / 3787kg |
| Front tire |
6.50-16 |
| Rear tire |
15.5-38 |
756 SERIAL NUMBERS
| Location |
Clutch housing, left side |
| 1967 (Farmall) |
7501 |
| 1968 (Farmall) |
9904 |
| 1969 (Farmall) |
14125 |
| 1970 (Farmall) |
17832 |
| 1971 (Farmall) |
18374 |
| 1967 (IH) |
7501 |
| 1968 (IH) |
7672 |
| 1969 (IH) |
8164 |
| 1970 (IH) |
8284 |
| 1971 (IH) |
8427 |
ELECTRICAL
| Charging system |
alternator |
| Charging amps |
55 |
| Batteries |
1(gas/LPG) / 2(diesel) |
| Battery volts |
12(gas/LPG) / 6(diesel) |
| Battery AH |
60(gas/LPG) / 130(diesel) |
