International Harvester 686 tractor specifications

1976 - 1980

Production

Production Manufacturer:International Harvester
Total built:6,000
Original price:$14,700 (1980 )
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.

International Harvester 686 Power

International Harvester 686 Power Drawbar (tested):58.01 hp
43.3 kW
PTO (tested):66.36 hp
49.5 kW
power test details ...

1976 - 1980

Nebraska Tractor Test 1151

Nebraska Tractor Test 1151
312 diesel Torque Amplifier 2WD November 3 - 14, 1973 Link: Nebraska Tractor Test 1151 file
PTO performance
Power at rated engine speed:	66.29 hp 49.4 kW
Fuel use:	4.7 gal/hour 17.8 l/hour
Drawbar performance
Max power:	58.01 hp 43.3 kW
Fuel use:	4.6 gal/hour 17.4 l/hour
Gear 3-Direct used for power test.
Max pull:	8,012 lbs 3634 kg
Gear 2-TA used for pull test.

Nebraska Tractor Test 1152

Nebraska Tractor Test 1152
Gasoline Torque Amplifier 2WD November 5 - December 3, 1973 Link: Nebraska Tractor Test 1152 file
PTO performance
Power at rated engine speed:	66.30 hp 49.4 kW
Fuel use:	12.0 gal/hour 45.4 l/hour
Drawbar performance
Max power:	57.29 hp 42.7 kW
Fuel use:	5.7 gal/hour 21.6 l/hour
Gear 3-Direct used for power test.
Max pull:	7,981 lbs 3620 kg
Gear 2-TA used for pull test.

Nebraska Tractor Test 1336

Nebraska Tractor Test 1336
310 diesel Torque Amplifier 2WD March 26 - April 16, 1980 Link: Nebraska Tractor Test 1336 file
PTO performance
Power at rated engine speed:	66.36 hp 49.5 kW
Fuel use:	4.1 gal/hour 15.5 l/hour
Drawbar performance
Max power:	57.71 hp 43.0 kW
Fuel use:	4.1 gal/hour 15.5 l/hour
Gear 3-Direct used for power test.
Max pull:	8,013 lbs 3634 kg
Gear 1-Direct used for pull test.

International Harvester 686 Engines

International Harvester 686 Engines International Harvester 5.1L 6-cyl diesel International Harvester 4.8L 6-cyl gasoline Engine details ...

1976 - 1980

Engines overview

Engines overview
International Harvester 5.1L 6-cyl diesel
International Harvester 4.8L 6-cyl gasoline

Engine Detail

Engine Detail
International Harvester D310
diesel
6-cylinder
liquid-cooled
German (Nuess) built diesel that replaced the 312 diesel in 1979.
Displacement:	310 ci 5.1 L
Bore/Stroke:	3.875x4.375 inches 98 x 111 mm
Rated RPM:	2000
Starter volts:	12

Engine Detail

Engine Detail
International Harvester D-312
diesel
6-cylinder
liquid-cooled
Displacement:	312 ci 5.1 L
Bore/Stroke:	3.875x4.410 inches 98 x 112 mm
Air cleaner:	dry
Rated RPM:	2000
Idle RPM:	900-2000
Oil capacity:	12 qts 11.4 L
Coolant capacity:	21 qts 19.9 L

Engine Detail

Engine Detail
International Harvester C291
gasoline
6-cylinder
liquid-cooled
Displacement:	291 ci 4.8 L
Bore/Stroke:	3.75x4.39 inches 95 x 112 mm
Rated RPM:	2000

Mechanical

Mechanical Chassis:4x2 2WD
Steering:power
Brakes:disc
Cab:Two-post fixed ROPS.
Transmission:10-speed two-speed power shift
Transmission details ...

1976 - 1980

Transmission

Transmission
Transmission:	Torque Amplifier
Type:	two-speed power shift
Gears:	10 forward and 2 reverse
Oil capacity:	64 qts 60.6 L

Speeds

Speeds
With 15.5-38 rear tires.

Capacity

Capacity Fuel:31 gal
117.3 L
Hydraulic system:16 gal
60.6 L

Hydraulics

Hydraulics Type:open center
Capacity:16 gal
60.6 L
Total flow:12 gpm
45.4 lpm

Tractor hitch

Tractor hitch Rear Type:II

Power Take-off (PTO)

Power Take-off (PTO) Rear PTO:independent
Rear RPM:540 (1.375)

Dimensions & Tires

Dimensions & Tires Wheelbase:103 inches
261 cm
Weight:7770 lbs
3524 kg
Front tire:7.50-16
Rear tire:15.5-38
Full dimensions and tires ...

1976 - 1980

International Harvester 686 Tires

International Harvester 686 Tires
Ag front:	7.50-16
Ag rear:	15.5-38

Dimensions

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