International Harvester 1066

The International Harvester 1066 is a tractor produced by International Harvester. It is equipped with a 414 ci 6.8 L engine. The listed engine power is 125.68 hp 93.7 kW. Transmission: Torque Amplifier. Operating weight: 12148 to 13345 pounds.

Engine Power

125.68 hp 93.7 kW

Fuel & Capacities

42 gal 159.0 L

Transmission

Torque Amplifier

Operating Weight

12148 to 13345 pounds

Overview

	1971 - 1976 66 SeriesRow-Crop tractor 66 Series Row-Crop tractor

Production
Manufacturer	International Harvester
Row-Crop tractor
Built in Rock Island, Illinois, USA
Total built	54,947
Original price was $21,100 in 1976
The hydrostatic drive 1066 Hydro was later renamed the Hydro 100. This was due to confusion over drawbar horsepower. The hydrostatic drive took a lot of power to operate, and the 1066 Hydro had much less power than a gear-driven 1066. Torque Amplifer (TA) was optional. The 1066 engine was altered in 1973 to increase horsepower.

Variants
1066 Hi-Clear	high-crop

International Harvester 1066 Engine
International Harvester 6.8L 6-cyl diesel
Fuel tank	42 gal 159.0 L
Engine details ...

International Harvester 1066 Power
Drawbar (claimed)	108 hp 80.5 kW
PTO (claimed)	126 hp 94.0 kW
Drawbar (tested)	105.95 hp 79.0 kW
PTO (tested)	125.68 hp 93.7 kW
Performance test details ...

Mechanical
Two- or four-wheel drive
Power steering
Hydraulic dry disc brakes
Open operator station. Two-post fixed ROPS available. Cab available with optional air-conditioning.

Hydraulics
Type	open center
Pump flow	12 gpm 45.4 lpm
Total flow	21 gpm 79.5 lpm
Steering flow	9 gpm 34.1 lpm

Tractor hitch
Rear Type	III/II
Rear lift (at 24"/610mm)	5600 lbs 2540 kg

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

Dimensions & Tires
Wheelbase	105 inches 266 cm
Weight	12148 to 13345 pounds
Front tire	11L-15
Rear tire	18.4-38
Full dimensions and tires ...

References

1066 Turbo Tractor published in 1971, by International Harvester
1066 Hydrostatic Tractor published in 1971, by International Harvester
766, 966, 1066 and 1466 Tractors published in 1972, by International Harvester
766, 966, 1066 and 1466 Tractors published in 1973, by International Harvester

Engine

Engine Detail — 414 ci / 6.8 L Diesel

Manufacturer	International Harvester DT414
Configuration	turbocharged diesel, 6-cylinder, liquid-cooled
Displacement	414 ci 6.8 L
Bore/Stroke	4.30x4.75 inches 109 x 121 mm
Air cleaner	dual stage dry
Rated RPM	2400
	2600 (after 1973)
Starter volts	12
Oil capacity	18 qts 17.0 L
Coolant capacity	25 qts 23.7 L

Transmission

Transmission options
8-speed gear
16-speed two-speed power shift
hydrostatic

Transmission — 8 forward and 4 reverse gear

Type	gear
Gears	8 forward and 4 reverse
Clutch	dry disc
Four gears each in high, low, and reverse ranges.
With 18.4-38 rear tires.

Transmission — Torque Amplifier

Transmission	Torque Amplifier
Type	two-speed power shift
Gears	16 forward and 8 reverse
Clutch	dry disc
Four gears (1-4) in two ranges (Low/High) with the two-speed Torque Amplifier power shift (TA/direct).
With 18.4-38 rear tires.

Transmission — infinite forward and reverse (two-range) hydrostatic

Type	hydrostatic
Gears	infinite forward and reverse (two-range)

Dimensions

International Harvester 1066 Tires
Ag front	11L-15
Ag rear	18.4-38

Dimensions
Wheelbase	105 inches 266 cm
Length	165 inches 419 cm
Width	98 inches 248 cm
Height (exhaust)	111 inches 281 cm
Clearance (drawbar)	16 inches 40 cm
Bar rear axle	3.25 inch diameter 82 mm

International Harvester 1066 Weight
Operating	12,148 lbs (gear) 5510 kg
	12,320 lbs (hydro) 5588 kg
	13,345 lbs (duals) 6053 kg
Ballasted	15,260 lbs 6921 kg

Tests

Tractor Tests
NTTL 1081: diesel Torque Amplifier 2WD
NTTL 1083: diesel hydrostatic 2WD
NTTL 1124: diesel gear 2WD

Nebraska Tractor Test 1081
Diesel Torque Amplifier 2WD October 1 - 21, 1971 Link: Nebraska Tractor Test 1081 file
PTO performance
Power at rated engine speed	116.23 hp 86.7 kW
Fuel use	7.7 gal/hour 29.1 l/hour
Power at rated PTO speed	112.18 hp 83.7 kW
Fuel use	6.8 gal/hour 25.7 l/hour
Drawbar performance
Max power	100.5 hp 74.9 kW
Fuel use	7.6 gal/hour 28.8 l/hour
Gear 1-Hi-TA used for power test.
Max pull	11625 lbs 5273 kg
Gear 3-Lo-TA used for pull test.

Nebraska Tractor Test 1083
Diesel hydrostatic 2WD October 7 - 25, 1971 Link: Nebraska Tractor Test 1083 file
PTO performance
Power at rated engine speed	113.58 hp 84.7 kW
Fuel use	7.9 gal/hour 29.9 l/hour
Power at rated PTO speed	109.32 hp 81.5 kW
Fuel use	7.0 gal/hour 26.5 l/hour
Drawbar performance
Max power	84.88 hp 63.3 kW
Fuel use	8.0 gal/hour 30.3 l/hour
Gear 5.4 MPH used for power test.
Max pull	9576 lbs 4343 kg
Gear 3.1 MPH used for pull test.

Nebraska Tractor Test 1124
Diesel gear 2WD April 17 - 27, 1973 Link: Nebraska Tractor Test 1124 file
PTO performance
Power at rated engine speed	125.68 hp 93.7 kW
Fuel use	8.4 gal/hour 31.8 l/hour
Power at rated PTO speed	119.2 hp 88.9 kW
Fuel use	7.3 gal/hour 27.6 l/hour
Drawbar performance
Max power	105.95 hp 79.0 kW
Fuel use	8.3 gal/hour 31.4 l/hour
Gear 1-Hi-TA used for power test.
Max pull	13000 lbs 5896 kg
Gear 2-Lo-Direct used for pull test.

Photos

Black-stripe International 1066.

1975 International 1066.

Recommended Implements & Sizing Guide

Engineering recommendations for International Harvester 1066 based on its 125.68 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	4 to 5 Bottom (16-18")4 - 5 铧 (40-45 cm)	Heavy Duty	Heavy primary tillage; semi-mounted hitch recommended.
Rotary Cutter / MowerMowing & Clearing	10 to 12 ft Flex-Wing3.0 - 3.6 m 折叠双翼	Heavy Duty	Wide swath pasture and crop residue shredding.
Rotary TillerSeedbed Prep	90 to 120 in Heavy Duty230 - 300 cm 重型旋耕机	Commercial / Field Scale	Deep intensive seedbed preparation for commercial row crops.
Disc HarrowSecondary Tillage	15 to 22 ft Folding Disc4.5 - 6.7 m 折叠式圆盘耙	Commercial / Field Scale	Wide commercial field leveling; requires hydraulic remotes.
Hay BalerHay & Forage	5x6 Round Baler or 3x3 Mid Square1.5x1.8 m 大圆捆或中型方捆机	Heavy Duty	High density baling; requires minimum 85 PTO HP.

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 1066.

Estimated Continuous Field Runtime: 6.4 hrs

Approximately 6.4 hours of continuous field operation at ~75% rated power on a full tank (42 gal / 159 L).

Estimated 75% Load Fuel Burn~6.5 gal/hr (24.7 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