International Harvester 786

The International Harvester 786 is a tractor produced by International Harvester. It is equipped with a 358 ci 5.9 L engine. The listed engine power is 80.20 hp 59.8 kW. Transmission: Torque Amplifier. Operating weight: 10600 to 11590 pounds.

Engine Power

80.20 hp 59.8 kW

Fuel & Capacities

50 gal 189.2 L

Transmission

Torque Amplifier

Operating Weight

11,590 lbs 5257 kg

Overview

	1980 - 1981 86 SeriesRow-Crop tractor 86 Series Row-Crop tractor

Production
Manufacturer	International Harvester
Row-Crop tractor
Built in Rock Island, Illinois, USA
Total built	1,844

International Harvester 786 Engine
International Harvester 5.9L 6-cyl diesel
Engine details ...

International Harvester 786 Transmission
16-speed two-speed power shift
Transmission details ...

International Harvester 786 Power
Drawbar (tested)	69.04 hp 51.5 kW
PTO (tested)	80.20 hp 59.8 kW
Performance test details ...

Mechanical
Two-wheel drive
Final drives	bull gear
Steering	power assist
Hydraulic disc brakes
Open operator station. Cab optional.

Capacity
Fuel	50 gal 189.2 L
	22 gal (auxiliary tank) 83.3 L
Hydraulic system	22.5 gal 85.2 L

Hydraulics
Type	open center
Capacity	22.5 gal 85.2 L

Tractor hitch
Rear Type	II/I

Power Take-off (PTO)
Rear PTO	independent
Rear PTO Type	540/1000 (1.375)

Dimensions & Tires
Wheelbase	101 inches 256 cm
Weight	10600 to 11590 pounds
Front tire	9.5L-15
Rear tire	18.4-34
Full dimensions and tires ...

Electrical
Ground	negative
Charging system	alternator
Charging amps	42
	61 (with cab)
Batteries	2
Battery CCA	470
Battery volts	12

References

Buyer's Guide 1981 published by International Harvester
Operator's Manual 786, 886, 986, 1086, 1486, 1586 and Hydro-186 Tractors (1096207R4) published in 1986

Engine

Engine Detail — 358 ci / 5.9 L Diesel

Manufacturer	International Harvester D-358
Fuel Type	Diesel
Configuration	6-cylinder, liquid-cooled
Displacement	358 ci 5.9 L
Bore/Stroke	3.875x5.0625 inches 98 x 129 mm
Air cleaner	dual dry element
Rated RPM	2400
Coolant capacity	24 qts 22.7 L
Oil capacity	12 qts 11.4 L

Transmission

Transmission — Torque Amplifier

Transmission	Torque Amplifier
Type	two-speed power shift
Gears	16 forward and 8 reverse
Oil capacity	90 qts 85.2 L
Oil type	IH Hy-Tran/B-6
The tractor must be stopped to shift the transmission (except the TA). The right-most console lever selects range (high, low, or reverse) and the left lever selects one of four gears. The Torque Amplifier (TA) is on the left side of the instrument panel and may be shifted without the clutch. Pulling back engages the TA, reducing the ground speed. Pushing the lever forward puts the transmission in direct drive (DD) mode.
18.4-34 rear tires.

	IH Hy-Tran/B-6

Dimensions

International Harvester 786 Tires
Ag front	9.5L-15
Ag rear	18.4-34

Dimensions
Wheelbase	101 inches 256 cm
Length	165 inches 419 cm
Width	102 inches 259 cm
Height (ROPS)	112 inches 284 cm
Shipping weight	10,600 lbs 4808 kg
Operating weight	11,590 lbs 5257 kg
Ground clearance	13 inches 33 cm

Tests

Nebraska Tractor Test 1388
Diesel Torque Amplifier 2WD April 30 - May 11, 1981 Link: Nebraska Tractor Test 1388 file
PTO performance
Power at rated engine speed	80.20 hp 59.8 kW
Fuel use	5.4 gal/hour 20.4 l/hour
Power at rated PTO speed	77.41 hp 57.7 kW
Fuel use	4.9 gal/hour 18.5 l/hour
Drawbar performance
Max power	69.04 hp 51.5 kW
Fuel use	5.4 gal/hour 20.4 l/hour
Gear 1H-TA used for power test.
Max pull	9968 lbs 4521 kg
Gear 2L-DD used for pull test.

Photos

International Harvester 786

Recommended Implements & Sizing Guide

Engineering recommendations for International Harvester 786 based on its 80.2 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	3 to 4 Bottom (16")3 - 4 铧 (40 cm)	Heavy Duty	Suitable for medium loam and stubble turnover.
Rotary Cutter / MowerMowing & Clearing	7 to 8 ft (84-96 in)2.1 - 2.4 m	Heavy Duty	Heavy-duty twin spindle cutter for overgrown acreage.
Rotary TillerSeedbed Prep	78 to 84 in200 - 215 cm	Heavy Duty	Heavy commercial tiller with multi-speed gearbox.
Disc HarrowSecondary Tillage	10 to 14 ft Tandem / Offset3.0 - 4.2 m 重型交错耙	Heavy Duty	Aggressive residue cutting in corn/cotton stubble.
Hay BalerHay & Forage	4x4 to 4x5 Round Baler1.2x1.5 m 紧凑圆捆机	Heavy Duty	Silage and dry hay; 540 RPM PTO with slip-clutch.

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for International Harvester 786.

Estimated Continuous Field Runtime: 12 hrs

Approximately 12 hours of continuous field operation at ~75% rated power on a full tank (50 gal / 189.3 L).

Estimated 75% Load Fuel Burn~4.2 gal/hr (15.8 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours