Overview
The Farmall 966 is a row-crop farm tractor manufactured by International Harvester between 1971 and 1976 in Rock Island, Illinois. It is powered by a 6.8L six-cylinder diesel engine and was available with multiple transmission configurations, including an 8-speed gear, a 16-speed Torque Amplifier, and a hydrostatic option. During its production run, 21,017 units were built with a listed 1976 price of $18,000.
Ideal Applications
Tested Power and Pulling Capacity:
In Nebraska Tractor Test 1123, the diesel gear version recorded a maximum drawbar pull of 10,036 pounds and reached a tested PTO power of 101.52 hp.
Transmission and Speed Control:
The tractor features a Torque Amplifier providing a shift-on-the-move underdrive for 16 forward speeds, or an optional hydrostatic transmission available until 1973.
Hydraulic and Hitch Specifications:
The model is equipped with an open center hydraulic system providing 21 gpm total flow and an IH Fast Hitch with a rear lift capacity of 5,000 pounds.
Production
| Description | Row-Crop tractor / Built in Rock Island, Illinois, USA / Original price was $18,000 in 1976 |
|---|---|
| Manufacturer | Farmall (a part of International Harvester) |
| Total built | 21,017 |
Engine
| Engine type | International Harvester 6.8L 6-cyl diesel |
|---|---|
| Air cleaner | dual dry elements |
| Bore/Stroke | 4.30x4.75 inches (109 x 121 mm) |
| Coolant capacity | 24 qts (22.7 L) |
| Description | International Harvester D414 / diesel / 6-cylinder / liquid-cooled |
| Displacement | 414 ci (6.8 L) |
| Firing order | 1-5-3-6-2-4 |
| Oil capacity | 12 qts (11.4 L) |
| Power | 91 hp (67.9 kW) |
| Rated RPM | 2400 (early) |
| Drawbar (claimed) | 84 hp (62.6 kW) |
| Drawbar (tested) | 85.21 hp (63.5 kW) |
| PTO (claimed) | 95 hp (70.8 kW) |
| PTO (tested) | 100.80 hp (75.2 kW) |
Transmission
| Clutch | dry disc / dry disc |
|---|---|
| Description | Four gears each provided in high, low, and reverse ranges. / 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. / The hydrostatic transmission option ended in 1973 when the Hydro 100 began production. |
| Gears | 8 forward and 4 reverse / 16 forward and 8 reverse / infinite forward and reverse |
| Oil capacity | 90 qts (85.2 L) |
| Transmission | Torque Amplifier |
| Type | gear / two-speed power shift / hydrostatic |
| Description | hydrostatic |
| Transmission type | 8-speed gear / 16-speed two-speed power shift |
| Description | hydrostatic |
| Transmission type | 8-speed gear / 16-speed two-speed power shift |
Mechanical
| Cab | Cab optional with heat and air-conditioning. |
|---|---|
| Description | Power steering / Independent hydraulic dry disc brakes |
| Drive type | Two- or four-wheel drive |
Capacity
| Fuel | 37 gal (140.0 L) |
|---|---|
| Hydraulic system | 22.5 gal (85.2 L) |
Hydraulics
| Capacity | 22.5 gal (85.2 L) |
|---|---|
| Pressure | 2000 psi (137.9 bar) |
| Pump flow | 12 gpm (45.4 lpm) |
| Steering flow | 9 gpm (34.1 lpm) |
| Steering press. | 1550 psi (106.9 bar) |
| Total flow | 21 gpm (79.5 lpm) |
| Type | open center |
| Valves | 1 to 4 |
Hitch
| Rear lift | 5000 lbs (at 24 inches) (2268 kg) |
|---|---|
| Rear lift (at 24"/610mm) | 4400 lbs (1995 kg) |
| Rear Type | II |
| Type | IH Fast Hitch |
PTO
| Rear PTO | independent |
|---|---|
| Rear PTO Type | 540/1000 |
Electrical
| Batteries | 2 |
|---|---|
| Battery AH | 172 |
| Battery volts | 6 |
| Charging amps | 32 |
Dimensions & Tires
| Ground clearance | 14 inches (35 cm) |
|---|---|
| Height (exhaust) | 105 inches (266 cm) |
| Length | 165 inches (419 cm) |
| Wheelbase | 105 inches (266 cm) |
| Width | 98 inches (248 cm) |
| Front tire | 9.5L-15 |
| Rear tire | 18.4-34 |
| Weight | 11116 to 11700 pounds |
| Wheelbase | 105 inches (266 cm) |
| Ag front | 9.5L-15 |
| Ag rear | 18.4-34 |
966 Serial Numbers
| 1971 | 7101 |
|---|---|
| 1972 | 11815 |
| 1973 | 17794 |
| 1974 | 22526 |
| 1975 | 28119 |
| 1976 | 31772 |
| Description | FAQ: How to read a serial number table. |
| Location: | Clutch housing, left side |
Farmall 966 Weight
| Ballasted | 13,500 lbs (6123 kg) |
|---|---|
| Operating | 11,116 lbs (gear) (5042 kg) |
Nebraska Tractor Test 1082
| Description | 2400rpm diesel gear/TA 2WDOctober 5 - 19, 1971Link: Nebraska Tractor Test 1082 file / PTO performance / Drawbar performance / Gear 1-Hi-TA used for power test. / Gear 3-Lo-TA used for pull test. |
|---|---|
| Fuel use | 6.5 gal/hour (24.6 l/hour) / 5.9 gal/hour (22.3 l/hour) / 6.4 gal/hour (24.2 l/hour) |
| Max power | 80.4 hp (60.0 kW) |
| Max pull | 10,041 lbs (4554 kg) |
| Power at rated engine speed | 96.04 hp (71.6 kW) |
| Power at rated PTO speed | 93.5 hp (69.7 kW) |
Nebraska Tractor Test 1095
| Description | Diesel hydrostatic 2WDApril 28 - May 12, 1972Link: Nebraska Tractor Test 1095 file / PTO performance / Drawbar performance / Gear 5.4 MPH used for power test. / Gear 2.77 MPH used for pull test. |
|---|---|
| Fuel use | 7.2 gal/hour (27.3 l/hour) / 6.4 gal/hour (24.2 l/hour) / 7.1 gal/hour (26.9 l/hour) |
| Max power | 68.08 hp (50.8 kW) |
| Max pull | 8,909 lbs (4041 kg) |
| Power at rated engine speed | 91.38 hp (68.1 kW) |
| Power at rated PTO speed | 88.29 hp (65.8 kW) |
Nebraska Tractor Test 1123
| Description | 2600rpm diesel gear/TA 2WDApril 20 - May 17, 1973Link: Nebraska Tractor Test 1123 file / PTO performance / Drawbar performance / Gear 1-Hi-TA used for power test. / Gear 3-Lo-TA used for pull test. |
|---|---|
| Fuel use | 6.9 gal/hour (26.1 l/hour) / 6.5 gal/hour (24.6 l/hour) / 6.9 gal/hour (26.1 l/hour) |
| Max power | 85.21 hp (63.5 kW) |
| Max pull | 10,036 lbs (4552 kg) |
| Power at rated engine speed | 100.80 hp (75.2 kW) |
| Power at rated PTO speed | 101.52 hp (75.7 kW) |
References
| Description | 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 |
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Speeds
| Description | With 18.4-34 rear tires. / With 18.4-34 rear tires. |
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Tractor Tests
| Description | NTTL 1082: 2400rpm diesel gear/TA 2WD / NTTL 1095: diesel hydrostatic 2WD / NTTL 1123: 2600rpm diesel gear/TA 2WD |
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