Introduction
International Harvester 686 Agricultural Tractor
The International Harvester 686 is a two-wheel drive tractor produced between 1976 and 1980. It represents a transition in the manufacturer's lineup, succeeding the IH 666 model following the introduction of the 86 series. This tractor is engineered for standard field operations, offering a balance of mechanical simplicity and operational versatility.
Engine and Performance
The tractor is powered by the International Harvester C291, a 4.8-liter, 6-cylinder liquid-cooled gasoline engine. It operates at a rated speed of 2000 RPM. With a power output of 73 horsepower, the engine is designed to handle consistent agricultural workloads. The cooling system has a capacity of 19.9 liters, while the oil system holds 11.4 liters.
Transmission and Drivetrain
The drivetrain features a Torque Amplifier transmission, which utilizes a two-speed power shift mechanism. This configuration provides the operator with 10 forward gears and 2 reverse gears, allowing for speed adjustments suitable for various soil conditions and implements. The system requires a transmission oil capacity of 60.6 liters.
Hydraulics and PTO
The hydraulic system is of the open-center type, delivering a total flow of 12 gallons per minute (45.4 liters per minute) with a total system capacity of 16 gallons (60.6 liters). Rear implement operation is facilitated by an independent rear PTO operating at 540 RPM. The tractor is equipped with a Category II rear three-point hitch.
Mechanical and Dimensions
The IH 686 is built on a 103-inch (261 cm) wheelbase, with a minimum width of 89.4 inches (227 cm). The machine is equipped with power steering for maneuverability and disc brakes for stopping power. Safety is addressed via a two-post fixed ROPS. The tractor has a shipping weight of 7,770 lbs (3,524 kg), which can be increased to a ballasted weight of 10,340 lbs (4,690 kg) for enhanced traction.
Conclusion
With its robust 6-cylinder engine and versatile transmission, the International Harvester 686 serves as a reliable utility tractor for mixed-farming operations. Its design focuses on mechanical durability and ease of maintenance, making it a functional choice for tasks requiring a standard 73-horsepower platform.
Production Information of International Harvester, 686
- The International Harvester 686 is nearly identical to the IH 666, it was simply renamed when the 86 series arrived in 1976. One major change did occur in 1979, when the 310 diesel replaced the 312.
- Original price was $14,700 in 1980
| Manufacturer | International Harvester |
|---|---|
| Total built | 6,000 |
Dimension and Tires Information of International Harvester, 686
| Front tread | 58 to 82 inches [147 to 208 cm] |
|---|---|
| Wheelbase | 103 inches [261 cm] |
| Diesel Shipping weight | 7770 lbs [3524 kg] |
| Height (exhaust) | 105 inches [266 cm] |
| Length | 162 inches [411 cm] |
| Rear tread | 56 to 96 inches [142 to 243 cm] |
| Ballasted weight | 10340 lbs [4690 kg] |
| Width | 89.4 inches [227 cm] |
Overall length with 3-point hitch
Minimum width
| Ag front | 7.50-16 |
|---|---|
| Ag rear | 15.5-38 |
Engine Specifications of International Harvester, 686
- International Harvester C291
- Liquid-cooled
- Gasoline
- 6-cylinder
| Coolant capacity | 21 qts [19.9 L] |
|---|---|
| Displacement | 291 ci [4.8 L] |
| Rated RPM | 2000 |
| Bore/Stroke | 3.75x4.39 inches [95 x 112 mm] |
| Oil capacity | 12 qts [11.4 L] |
| Idle RPM | 900-2000 |
| Rated RPM | 2000 |
Transmission Information of International Harvester, 686
Transmission variants 1
| Transmission | Torque Amplifier |
|---|---|
| Oil capacity | 64 qts [60.6 L] |
| Type | Two-speed power shift |
| Gears | 10 forward and 2 reverse |
Mechanical Specs of International Harvester, 686
- Two-wheel drive
- Two-post fixed ROPS.
- Power steering
- Disc brakes
Power Information of International Harvester, 686
| Rear PTO | Independent |
|---|---|
| Rear PTO Type | 540 (1.375) |
Hydraulics Specifications of International Harvester, 686
| Type | Open center |
|---|---|
| Capacity | 16 gal [60.6 L] |
| Total flow | 12 gpm [45.4 lpm] |
Three-Point Hitch of International Harvester, 686
| Rear Type | II |
|---|
Where it sits
With 73 hp[P] HP, the International Harvester 686 sits just below 666 (75 HP) in International Harvester's range. Its power puts it in the 53th percentile of 1970s models in our database (1259 machines).
Frequently asked questions
How much horsepower does the International Harvester 686 have?
The International Harvester 686 delivers 73 hp[P] HP.
What years was the International Harvester 686 produced?
The International Harvester 686 was produced in 1976-1980.
What engine does the International Harvester 686 have?
The International Harvester 686 is powered by a Gasoline, 6-cylinder engine.
What transmission does the International Harvester 686 use?
The International Harvester 686 uses a Torque Amplifier transmission.
How much does the International Harvester 686 weigh?
The International Harvester 686 weighs 7770 lbs [3524 kg].
Is the International Harvester 686 4WD?
The International Harvester 686 is available in 2WD.