| Manufacturer |
International Harvester |
| Price |
14,700(USD) |
| Model |
686 |
| Equipment Type |
- |
| Factory |
|
NEBRASKA TRACTOR TEST 1151 2
| Description |
312 diesel Torque Amplifier 2WD November 3 - 14, 1973 Link: Nebraska Tractor Test 1151 file PTO performance Drawbar performance Gear 3-Direct used for power test Gear 2-TA used for pull test |
| Power at rated engine speed |
66.29hp / 49.4kW |
| Fuel use |
4.6gal/hour / 17.4l/hour |
| Max power |
58.01hp / 43.3kW |
| Max pull |
8,012lbs / 3634kg |
NEBRASKA TRACTOR TEST 1152 2
| Description |
Gasoline Torque Amplifier 2WD November 5 - December 3, 1973 Link: Nebraska Tractor Test 1152 file PTO performance Drawbar performance Gear 3-Direct used for power test Gear 2-TA used for pull test |
| Power at rated engine speed |
66.30hp / 49.4kW |
| Fuel use |
5.7gal/hour / 21.6l/hour |
| Max power |
57.29hp / 42.7kW |
| Max pull |
7,981lbs / 3620kg |
NEBRASKA TRACTOR TEST 1336 2
| Description |
310 diesel Torque Amplifier 2WD March 26 - April 16, 1980 Link: Nebraska Tractor Test 1336 file PTO performance Drawbar performance Gear 3-Direct used for power test Gear 1-Direct used for pull test |
| Power at rated engine speed |
66.36hp / 49.5kW |
| Fuel use |
4.1gal/hour / 15.5l/hour |
| Max power |
57.71hp / 43.0kW |
| Max pull |
8,013lbs / 3634kg |
INTERNATIONAL HARVESTER 686 POWER
| Drawbar (tested) |
58.01hp / 43.3kW |
| PTO (tested) |
66.36hp / 49.5kW |
ENGINES OVERVIEW
The International Harvester 686 tractor is powered by either a 5.1L 6-cylinder diesel engine or a 4.8L 6-cylinder gasoline engine, providing versatility in fuel options for different operational scenarios. The diesel variant offers better fuel efficiency and torque at low RPMs, making it ideal for heavy-duty applications, while the gasoline engine may have advantages in lower initial cost and easier maintenance. However, the diesel engine's higher upfront cost and potential emissions regulations could pose challenges for some users.
| Description |
International Harvester 5.1L 6-cyl diesel International Harvester 4.8L 6-cyl gasoline |
ENGINE DETAIL 1
The International Harvester 686 is powered by a robust D310 diesel engine, featuring a notable 310 ci displacement, which offers a suitable balance of torque and efficiency for medium to heavy-duty agricultural tasks. With a rated RPM of 2000, the engine is optimized for sustained power delivery, making it ideal for plowing and towing applications. However, potential challenges include parts availability and engine servicing, particularly as it utilizes a unique German-built design that may limit aftermarket support compared to more common models.
| Description |
International Harvester D310 diesel 6-cylinder liquid-cooled German (Nuess) built diesel that replaced the 312 diesel in 1979 |
| Displacement |
310ci / 5.1L |
| Bore/Stroke |
3.875x4.375inches / 98x 111mm |
| Rated RPM |
2000 |
| Starter volts |
12 |
ENGINE DETAIL 2
The International Harvester 686 is powered by a D-312 diesel engine, providing robust performance at a rated RPM of 2000, suitable for a variety of agricultural tasks. Its 312ci (5.1L) displacement and 6-cylinder configuration deliver substantial torque and efficiency, although the dry air cleaner may require more frequent maintenance in dust-heavy environments. With an oil capacity of 12 quarts and a coolant capacity of 21 quarts, it’s critical to monitor fluid levels for optimal cooling and lubrication during extended operations.
| Description |
International Harvester D-312 diesel 6-cylinder liquid-cooled |
| Displacement |
312ci / 5.1L |
| Bore/Stroke |
3.875x4.410inches / 98x 112mm |
| Air cleaner |
dry |
| Rated RPM |
2000 |
| Idle RPM |
900-2000 |
| Oil capacity |
12qts / 11.4L |
| Coolant capacity |
21qts / 19.9L |
ENGINE DETAIL 3
The International Harvester 686 features a robust C291 gasoline engine with a displacement of 291 ci (4.8L), offering a suitable balance of power and torque for medium-duty field operations. Its bore and stroke dimensions (3.75x4.39 inches) provide a characteristic long-stroke design that enhances low-end torque, making it effective for sustaining operations like plowing and cultivating at the rated RPM of 2000. However, potential drawbacks include fuel efficiency considerations and maintenance complexity associated with liquid-cooled systems, which may require more attention in adverse operating environments.
| Description |
International Harvester C291 gasoline 6-cylinder liquid-cooled |
| Displacement |
291ci / 4.8L |
| Bore/Stroke |
3.75x4.39inches / 95x 112mm |
| Rated RPM |
2000 |
INTERNATIONAL HARVESTER 686 ENGINES
The International Harvester 686 is equipped with either a 5.1L 6-cylinder diesel or a 4.8L 6-cylinder gasoline engine, offering versatility for different fuel preferences and operational demands. The diesel variant provides superior torque and fuel efficiency, making it advantageous for heavy tillage tasks, while the gasoline engine delivers quicker start-up and smoother operation for general farming activities. Potential challenges may include higher maintenance costs for the diesel engine and the need for proper fuel management to take advantage of its benefits.
| Description |
International Harvester 5.1L 6-cyl diesel/International Harvester 4.8L 6-cyl gasoline |
TRANSMISSION
The International Harvester 686 features a torque amplifier in a two-speed power shift transmission, providing 10 forward and 2 reverse gears for enhanced versatility in various farming scenarios. Its 64-quart oil capacity ensures adequate lubrication, critical for maintaining transmission efficiency during extended use. While the transmission offers improved power management, operators must be aware of potential oil heat issues during heavy loads, necessitating regular oil checks and maintenance to prevent failures.
| Transmission |
Torque Amplifier |
| Type |
two-speed power shift |
| Gears |
10 forward and 2 reverse |
| Oil capacity |
64qts / 60.6L |
SPEEDS
| Description |
With 15.5-38 rear tires |
MECHANICAL
The International Harvester 686, with its 4x2 2WD chassis, offers simplicity and ease of maintenance, ideal for flat or moderately inclined fields. The power steering enhances maneuverability, while the disc brakes provide reliable stopping power, crucial for safety in varied terrains. The 10-speed two-speed power shift transmission allows for efficient speed and torque management, benefiting tasks that require versatility and fine control.
| Chassis |
4x2 2WD |
| Steering |
power |
| Brakes |
disc |
| Cab |
Two-post fixed ROPS |
| Transmission |
10-speed two-speed power shift |
CAPACITY
| Fuel |
31gal / 117.3L |
| Hydraulic system |
16gal / 60.6L |
HYDRAULICS
| Type |
open center |
| Capacity |
16gal / 60.6L |
| Total flow |
12gpm / 45.4lpm |
TRACTOR HITCH
POWER TAKE-OFF (PTO)
| Rear PTO |
independent |
| Rear RPM |
540 (1.375) |
INTERNATIONAL HARVESTER 686 TIRES
The International Harvester 686 tractor features Ag tires with a 7.50-16 front size and 15.5-38 rear size, providing optimal traction and stability for various agricultural applications. The larger rear tires enhance pulling power and weight distribution, making it suitable for heavy towing and tillage tasks. However, be mindful of the potential challenges in maneuverability in tighter spaces due to the increased overall width and turning radius associated with larger rear tires.
| Ag front |
7.50-16 |
| Ag rear |
15.5-38 |
DIMENSIONS
| Wheelbase |
103inches / 261cm |
| Length |
162inches / 411cm *Overall length with 3-point hitch |
| Width |
89.4inches / 227cm *Minimum width |
| Height (exhaust) |
105inches / 266cm |
| Diesel Shipping weight |
7770lbs / 3524kg |
| Ballasted weight |
10340lbs / 4690kg |
| Front tread |
58 to 82inches / 147to 208cm |
| Rear tread |
56 to 96inches / 142to 243cm |
DIMENSIONS & TIRES
The International Harvester 686 tractor, with a 103-inch wheelbase, offers enhanced stability during operation, particularly in hilly or uneven terrains. Its weight of 7,770 lbs provides improved traction yet may challenge maneuverability in confined spaces. The combination of 7.50-16 front tires and 15.5-38 rear tires allows for efficient plowing and towing capabilities, making it suitable for mid-sized farming operations.
| Wheelbase |
103inches / 261cm |
| Weight |
7770lbs / 3524kg |
| Front tire |
7.50-16 |
| Rear tire |
15.5-38 |
686 SERIAL NUMBERS
| Location |
Clutch housing on right side |
| 1976 |
7500 |
| 1977 |
7729 |
| 1978 |
9899 |
| 1979 |
11417 |
| 1980 |
12923 |
