Farmall 966
The Farmall 966 is a tractor produced by Farmall. It is equipped with a 414 ci 6.8 L engine. The listed engine power is Diesel (listed): 91 hp / 67.9 kW. Transmission: Torque Amplifier. Operating weight: 11116 to 11700 pounds.
Engine Power
Diesel (listed): 91 hp / 67.9 kW
Fuel & Capacities
37 gal
140.0 L
Transmission
Torque Amplifier
Operating Weight
11116 to 11700 pounds
Overview
 | 1971 - 1976
66 SeriesRow-Crop tractor
66 Series
Row-Crop tractor |
|---|
Series map: 766966Hydro 10088.6hp*91.0hp115.7hp**Estimated engine power for comparison only.
Note: the Farmall model 966 is the same as the International Harvester 966. The following data is from the 966 listing. |
Production | |
|---|---|
Manufacturer | Farmall (a part of International Harvester) |
Row-Crop tractor | |
Built in Rock Island, Illinois, USA | |
Total built | 21,017 |
Original price was $18,000 in 1976 | |
Farmall 966 Engine | |
|---|---|
International Harvester 6.8L 6-cyl diesel | |
Engine details ...  |
Farmall 966 Power | |
|---|---|
Engine | 91 hp
67.9 kW |
Drawbar (claimed) | 84 hp
62.6 kW |
PTO (claimed) | 95 hp
70.8 kW |
Drawbar (tested) | 85.21 hp
63.5 kW |
PTO (tested) | 100.80 hp
75.2 kW |
Performance test details ...  | |
Mechanical | |
|---|---|
Two- or four-wheel drive | |
Power steering | |
Independent hydraulic dry disc brakes | |
Cab optional with heat and air-conditioning. |
Capacity | |
|---|---|
Fuel | 37 gal
140.0 L |
Hydraulic system | 22.5 gal
85.2 L |
Hydraulics | |
|---|---|
Type | open center |
Capacity | 22.5 gal
85.2 L |
Pressure | 2000 psi
137.9 bar |
Valves | 1 to 4 |
Pump flow | 12 gpm
45.4 lpm |
Total flow | 21 gpm
79.5 lpm |
Steering flow | 9 gpm
34.1 lpm |
Steering press. | 1550 psi
106.9 bar |
Tractor hitch | |
|---|---|
Rear Type | II |
Rear lift (at 24"/610mm) | 4400 lbs
1995 kg |
Type | IH Fast Hitch |
Rear lift | 5000 lbs (at 24 inches)
2268 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Rear PTO Type | 540/1000 |
Dimensions & Tires | |
|---|---|
Wheelbase | 105 inches
266 cm |
Weight | 11116 to 11700 pounds |
Front tire | 9.5L-15 |
Rear tire | 18.4-34 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Charging amps | 32 |
Batteries | 2 |
Battery volts | 6 |
Battery AH | 172 |
References | |
|---|---|
 | |
International Tractor Range published in 1973, by International Harvester | |
Buyer's Guide published in 1976, by International Harvester | |
Farm Equipment Reference Catalog published in 1971, by International Harvester |
Engine
Series map: 766966Hydro 10088.6hp*91.0hp115.7hp**Estimated engine power for comparison only.
Note: the Farmall model 966 is the same as the International Harvester 966. The following data is from the 966 listing. |
Engine Detail — 414 ci / 6.8 L Diesel
Manufacturer | International Harvester D414 |
Fuel Type | Diesel |
Configuration | 6-cylinder, liquid-cooled |
Displacement | 414 ci
6.8 L |
Bore/Stroke | 4.30x4.75 inches
109 x 121 mm |
Power | 91 hp
67.9 kW |
Air cleaner | dual dry elements |
Rated RPM | 2400 (early) |
2600 (late) | |
Firing order | 1-5-3-6-2-4 |
Oil capacity | 12 qts
11.4 L |
Coolant capacity | 24 qts
22.7 L |
Transmission
Series map: 766966Hydro 10088.6hp*91.0hp115.7hp**Estimated engine power for comparison only.
Note: the Farmall model 966 is the same as the International Harvester 966. The following data is from the 966 listing. |
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 |
Oil capacity | 90 qts
85.2 L |
Four gears each provided in high, low, and reverse ranges. | |
With 18.4-34 rear tires. | |
 | |
Transmission — Torque Amplifier
Transmission | Torque Amplifier |
Type | two-speed power shift |
Gears | 16 forward and 8 reverse |
Clutch | dry disc |
The Torque Amplifier (TA) provides a shift-on-the-move underdrive to the standard transmission. In any gear and range, the transmission can be shifted from direct drive (DD) to the slower TA speed by simply pulling the TA lever back. No clutching or stopping is needed. | |
With 18.4-34 rear tires. | |
 | |
Transmission — infinite forward and reverse hydrostatic
Type | hydrostatic |
Gears | infinite forward and reverse |
The hydrostatic transmission option ended in 1973 when the Hydro 100 began production. | |
 | |
Dimensions
Series map: 766966Hydro 10088.6hp*91.0hp115.7hp**Estimated engine power for comparison only.
Note: the Farmall model 966 is the same as the International Harvester 966. The following data is from the 966 listing. |
Farmall 966 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 |
Ground clearance | 14 inches
35 cm |
Farmall 966 Weight | |
|---|---|
Operating | 11,116 lbs (gear)
5042 kg |
11,700 lbs (hydro)
5307 kg | |
Ballasted | 13,500 lbs
6123 kg |
Tests
Series map: 766966Hydro 10088.6hp*91.0hp115.7hp**Estimated engine power for comparison only.
Note: the Farmall model 966 is the same as the International Harvester 966. The following data is from the 966 listing. |
Tractor Tests | |
|---|---|
NTTL 1082: 2400rpm diesel gear/TA 2WD | |
NTTL 1095: diesel hydrostatic 2WD | |
NTTL 1123: 2600rpm diesel gear/TA 2WD |
Nebraska Tractor Test 1082 | |
|---|---|
2400rpm diesel gear/TA 2WD
October 5 - 19, 1971
Link: Nebraska Tractor Test 1082 file | |
PTO performance | |
Power at rated engine speed | 96.04 hp
71.6 kW |
Fuel use | 6.5 gal/hour
24.6 l/hour |
Power at rated PTO speed | 93.5 hp
69.7 kW |
Fuel use | 5.9 gal/hour
22.3 l/hour |
Drawbar performance | |
Max power | 80.4 hp
60.0 kW |
Fuel use | 6.4 gal/hour
24.2 l/hour |
Gear 1-Hi-TA used for power test. | |
Max pull | 10,041 lbs
4554 kg |
Gear 3-Lo-TA used for pull test. | |
Nebraska Tractor Test 1095 | |
|---|---|
Diesel hydrostatic 2WD
April 28 - May 12, 1972
Link: Nebraska Tractor Test 1095 file | |
PTO performance | |
Power at rated engine speed | 91.38 hp
68.1 kW |
Fuel use | 7.2 gal/hour
27.3 l/hour |
Power at rated PTO speed | 88.29 hp
65.8 kW |
Fuel use | 6.4 gal/hour
24.2 l/hour |
Drawbar performance | |
Max power | 68.08 hp
50.8 kW |
Fuel use | 7.1 gal/hour
26.9 l/hour |
Gear 5.4 MPH used for power test. | |
Max pull | 8,909 lbs
4041 kg |
Gear 2.77 MPH used for pull test. | |
Nebraska Tractor Test 1123 | |
|---|---|
2600rpm diesel gear/TA 2WD
April 20 - May 17, 1973
Link: Nebraska Tractor Test 1123 file | |
PTO performance | |
Power at rated engine speed | 100.80 hp
75.2 kW |
Fuel use | 6.9 gal/hour
26.1 l/hour |
Power at rated PTO speed | 101.52 hp
75.7 kW |
Fuel use | 6.5 gal/hour
24.6 l/hour |
Drawbar performance | |
Max power | 85.21 hp
63.5 kW |
Fuel use | 6.9 gal/hour
26.1 l/hour |
Gear 1-Hi-TA used for power test. | |
Max pull | 10,036 lbs
4552 kg |
Gear 3-Lo-TA used for pull test. | |
Photos
Farmall 966
Farmall 966
Farmall 966
Farmall 966
Farmall 966 Hydro.
Farmall 966.
Farmall 966 with cab.
Recommended Implements & Sizing Guide
Engineering recommendations for Farmall 966 based on its 91 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 | 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 966.
Estimated Continuous Field Runtime: 7.8 hrs
Approximately 7.8 hours of continuous field operation at ~75% rated power on a full tank (37 gal / 140.1 L).
Estimated 75% Load Fuel Burn~4.7 gal/hr (17.9 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 966 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Farmall 966.
Converted Equivalents:
Horsepower (HP)91 hp
Kilowatts (kW)67.9 kW
Metric Horsepower (PS / CV)92.3 PS
Direct Competitor Comparison
Compare Farmall 966 against same-era industry alternatives in the same horsepower class.
Current Model
Farmall
Farmall 966
Engine Power:Diesel (listed): 91 hp / 67.9 kW
★ Baseline Reference
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