International Harvester

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.

Power73 hp[P]

Founded1976 - 1980

Model686

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Technical Specifications

Detailed specifications and technical data for International Harvester 686

Power

PTO (tested)	66.36 hp (49.5 kW)
Drawbar (tested)	58.01 hp (43.3 kW)

Tires

Ag rear	15.5-38
Ag front	7.50-16

Engine

Engine options	International Harvester 5.1L 6-cyl diesel, International Harvester 4.8L 6-cyl gasoline
Idle RPM D-312	900-2000
Rated RPM C291	2000
Rated RPM D310	2000
Rated RPM D-312	2000
Bore/Stroke C291	3.75x4.39 inches (95 x 112 mm)
Bore/Stroke D310	3.875x4.375 inches (98 x 111 mm)
Air cleaner D-312	dry
Bore/Stroke D-312	3.875x4.410 inches (98 x 112 mm)
Displacement C291	291 ci (4.8 L)
Displacement D310	310 ci (5.1 L)
Displacement D-312	312 ci (5.1 L)
Oil capacity D-312	12 qts (11.4 L)
Starter volts D310	12
Coolant capacity D-312	21 qts (19.9 L)
International Harvester C291	gasoline, 6-cylinder, liquid-cooled
International Harvester D310	diesel, 6-cylinder, liquid-cooled, German (Nuess) built diesel that replaced the 312 diesel in 1979
International Harvester D-312	diesel, 6-cylinder, liquid-cooled

Capacity

Fuel	31 gal (117.3 L)
Hydraulic system	16 gal (60.6 L)

Dimensions

Width	89.4 inches (227 cm) Minimum width
Length	162 inches (411 cm) Overall length with 3-point hitch
Wheelbase	103 inches (261 cm)
Rear tread	56 to 96 inches (142 to 243 cm)
Front tread	58 to 82 inches (147 to 208 cm)
Years produced	1976 - 1980
Ballasted weight	10340 lbs (4690 kg)
Height (exhaust)	105 inches (266 cm)
Diesel Shipping weight	7770 lbs (3524 kg)

Hydraulics

Type	open center
Capacity	16 gal (60.6 L)
Total flow	12 gpm (45.4 lpm)

Mechanical

ROPS	Two-post fixed ROPS
Drive	Two-wheel drive
Brakes	Disc brakes
Steering	Power steering

Production

Notes	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.
Total built	6,000
Manufacturer	International Harvester
Original price	$14,700 in 1980
Years produced	1976 - 1980

Transmission