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Engine:
Farmall Standard
Power:
91 HP (Engine) / HP (PTO)
Fuel Type:
Diesel
Production:
1971 - 1976
| Overview | |
|---|---|
| Summary | x1971 - 1976 66 Series Row-Crop tractor |
| Production | |
|---|---|
| Manufacturer | Farmall (a part of International Harvester) |
| Summary | Row-Crop tractor / Built in Rock Island, Illinois, USA |
| Total built | 21,017 |
| Summary | Original price was $18,000 in 1976 |
| Mechanical | |
|---|---|
| Summary | 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 |
| Electrical | |
|---|---|
| Charging amps | 32 |
| Batteries | 2 |
| Battery volts | 6 |
| Battery AH | 172 |
| References | |
|---|---|
| Summary | / 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 |
| Note: the Farmall model 966 is the same as the International Harvester 966. The following data is from the 966 listing. | |
|---|---|
| Engine Detail | |
|---|---|
| Summary | International Harvester D414 / diesel / 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 |
| Note: the Farmall model 966 is the same as the International Harvester 966. The following data is from the 966 listing. | |
|---|---|
| Transmission options | |
|---|---|
| Summary | 8-speed gear / 16-speed two-speed power shift / hydrostatic |
| Transmission | |
|---|---|
| Type | gear |
| Gears | 8 forward and 4 reverse |
| Clutch | dry disc |
| Oil capacity | 90 qts 85.2 L |
| Summary | Four gears each provided in high, low, and reverse ranges. |
| Transmission | |
|---|---|
| Transmission | Torque Amplifier |
| Type | two-speed power shift |
| Gears | 16 forward and 8 reverse |
| Clutch | dry disc |
| Summary | 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. |
| Transmission | |
|---|---|
| Type | hydrostatic |
| Gears | infinite forward and reverse |
| Summary | The hydrostatic transmission option ended in 1973 when the Hydro 100 began production. |
| 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 |
| Note: the Farmall model 966 is the same as the International Harvester 966. The following data is from the 966 listing. | |
|---|---|
| Tractor Tests | |
|---|---|
| Summary | NTTL 1082: 2400rpm diesel gear/TA 2WD / NTTL 1095: diesel hydrostatic 2WD / NTTL 1123: 2600rpm diesel gear/TA 2WD |
| Nebraska Tractor Test 1082 | |
|---|---|
| Summary | 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 |
| Summary | Drawbar performance |
| Max power | 80.4 hp 60.0 kW |
| Fuel use | 6.4 gal/hour 24.2 l/hour |
| Summary | Gear 1-Hi-TA used for power test. |
| Max pull | 10,041 lbs 4554 kg |
| Summary | Gear 3-Lo-TA used for pull test. |
| Nebraska Tractor Test 1095 | |
|---|---|
| Summary | 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 |
| Summary | Drawbar performance |
| Max power | 68.08 hp 50.8 kW |
| Fuel use | 7.1 gal/hour 26.9 l/hour |
| Summary | Gear 5.4 MPH used for power test. |
| Max pull | 8,909 lbs 4041 kg |
| Summary | Gear 2.77 MPH used for pull test. |
| Nebraska Tractor Test 1123 | |
|---|---|
| Summary | 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 |
| Summary | Drawbar performance |
| Max power | 85.21 hp 63.5 kW |
| Fuel use | 6.9 gal/hour 26.1 l/hour |
| Summary | Gear 1-Hi-TA used for power test. |
| Max pull | 10,036 lbs 4552 kg |
| Summary | Gear 3-Lo-TA used for pull test. |
Last Database Update: 11/18/2025