Farmall 766
The Farmall 766 is a tractor produced by Farmall. It is equipped with a 360 ci 5.9 L engine. The listed engine power is 85.45 hp 63.7 kW. Transmission: Torque Amplifier. Operating weight: 10,300 lbs 4672 kg.
Engine Power
85.45 hp
63.7 kW
Fuel & Capacities
Diesel
Transmission
Torque Amplifier
Operating Weight
10,300 lbs
4672 kg
Overview
 | 66 SeriesRow-Crop tractor |
|---|---|
66 Series | |
Row-Crop tractor | |
Series map: 76696688.6hp*91.0hp
Note: the Farmall model 766 is the same as the International Harvester 766. The following data is from the 766 listing. |
Production | |
|---|---|
Manufacturer | Farmall (a part of International Harvester) |
Row-Crop tractor | |
Built in Rock Island, Illinois, USA | |
Total built | 10,799 |
Original price was $13,400 in 1976 | |
Farmall 766 Power | |
|---|---|
Drawbar (tested) | 73.37 hp
54.7 kW |
PTO (tested) | 85.45 hp
63.7 kW |
Performance test details ...  | |
Mechanical | |
|---|---|
Two-wheel drive | |
Power steering | |
Hydraulic dry disc brakes | |
Open operator station. Cab optional. |
Hydraulics | |
|---|---|
Type | open center |
Pump flow | 12 gpm
45.4 lpm |
Tractor hitch | |
|---|---|
Rear Type | 2 |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Rear PTO Type | 540/1000 |
Dimensions & Tires | |
|---|---|
Wheelbase | 105 inches
266 cm |
Weight | 10,300 lbs
4672 kg |
Front tire | 9.5L-15 |
Rear tire | 18.4-34 |
Full dimensions and tires ...  | |
Engine
Series map: 76696688.6hp*91.0hp
Note: the Farmall model 766 is the same as the International Harvester 766. The following data is from the 766 listing. |
Engine options | |
|---|---|
International Harvester 4.8L 6-cyl gasoline | |
International Harvester 5.9L 6-cyl diesel |
Engine Detail — 291 ci / 4.8 L Gasoline
Manufacturer | International Harvester C291 |
Fuel Type | Gasoline |
Configuration | 6-cylinder, liquid-cooled |
Displacement | 291 ci
4.8 L |
Bore/Stroke | 3.75x4.39 inches
95 x 112 mm |
Air cleaner | dual stage dry |
Rated RPM | 2400 |
Starter volts | 12 |
Engine Detail — 360 ci / 5.9 L Diesel
Manufacturer | International Harvester D360 |
Fuel Type | Diesel |
Configuration | 6-cylinder, liquid-cooled |
Displacement | 360 ci
5.9 L |
Bore/Stroke | 3.875x5.0625 inches
98 x 129 mm |
Compression | 17:1 |
Rated RPM | 2400 |
Starter volts | 12 |
Transmission
Series map: 76696688.6hp*91.0hp
Note: the Farmall model 766 is the same as the International Harvester 766. The following data is from the 766 listing. |
Transmission options | |
|---|---|
8-speed gear | |
16-speed two-speed power shift |
Transmission — 8 forward and 4 reverse gear
Type | gear |
Gears | 8 forward and 4 reverse |
Clutch | dry disc |
Four gears (1-4) in low and high ranges. | |
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 Torque Amplifer (TA) power shift. The TA allows a shift-on-the-move between direct drive and a lower speed. | |
Dimensions
Series map: 76696688.6hp*91.0hp
Note: the Farmall model 766 is the same as the International Harvester 766. The following data is from the 766 listing. |
Farmall 766 Tires | |
|---|---|
Ag front | 9.5L-15 |
Ag rear | 18.4-34 |
Dimensions | |
|---|---|
Wheelbase | 105 inches
266 cm |
Length | 165 inches
419 cm |
Width | 98 inches
248 cm |
Height (exhaust) | 105 inches
266 cm |
Operating weight | 10,300 lbs
4672 kg |
Ballasted weight | 11,880 lbs
5388 kg |
Clearance (drawbar) | 14 inches
35 cm |
Front tread | 60 to 84 inches
152 to 213 cm |
Rear tread | 56 to 100 inches
142 to 254 cm |
Tests
Series map: 76696688.6hp*91.0hp
Note: the Farmall model 766 is the same as the International Harvester 766. The following data is from the 766 listing. |
Tractor Tests | |
|---|---|
NTTL 1094: gasoline Torque Amplifier 2WD | |
NTTL 1117: diesel Torque Amplifier 2WD |
Nebraska Tractor Test 1094 | |
|---|---|
Gasoline Torque Amplifier 2WD
4/20/1972
Link: Nebraska Tractor Test 1094 file | |
PTO performance | |
Power at rated engine speed | 79.73 hp
59.5 kW |
Fuel use | 7.1 gal/hour
26.9 l/hour |
Power at rated PTO speed | 73.96 hp
55.2 kW |
Fuel use | 6.3 gal/hour
23.8 l/hour |
Drawbar performance | |
Max power | 71.32 hp
53.2 kW |
Fuel use | 7.3 gal/hour
27.6 l/hour |
Gear 1-Hi-TA used for power test. | |
Max pull | 8,841 lbs
4010 kg |
Gear 2-Lo-Direct used for pull test. | |
Nebraska Tractor Test 1117 | |
|---|---|
Diesel Torque Amplifier 2WD
November 10 - December 5, 1972
Link: Nebraska Tractor Test 1117 file | |
PTO performance | |
Power at rated engine speed | 85.45 hp
63.7 kW |
Fuel use | 6.2 gal/hour
23.5 l/hour |
Power at rated PTO speed | 85.66 hp
63.9 kW |
Fuel use | 5.8 gal/hour
22.0 l/hour |
Drawbar performance | |
Max power | 73.37 hp
54.7 kW |
Fuel use | 6.1 gal/hour
23.1 l/hour |
Gear 1-Hi-TA used for power test. | |
Max pull | 9,236 lbs
4189 kg |
Gear 2-Lo-Direct used for pull test. | |
Photos
Farmall 766 with four-wheel drive.
Farmall 766 with four-wheel drive.
Recommended Implements & Sizing Guide
Engineering recommendations for Farmall 766 based on its 85.45 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 Farmall 766.
Estimated Continuous Field Runtime: 1.4 hrs
Approximately 1.4 hours of continuous field operation at ~75% rated power on a full tank (6.1 gal / 23.1 L).
Estimated 75% Load Fuel Burn~4.4 gal/hr (16.8 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
Farmall 766 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Farmall 766.
Converted Equivalents:
Horsepower (HP)85.5 hp
Kilowatts (kW)63.7 kW
Metric Horsepower (PS / CV)86.6 PS
Direct Competitor Comparison
Compare Farmall 766 against same-era industry alternatives in the same horsepower class.
Current Model
Farmall
Farmall 766
Engine Power:85.45 hp
63.7 kW
★ Baseline Reference
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