Farmall
Farmall 666
The Farmall 666 is a row-crop tractor produced from 1972 to 1976 by Farmall, a part of International Harvester. Built in Rock Island, Illinois, USA, a total of 9,367 units were made. It features engine options including a 5.1L 6-cylinder diesel and a 4.8L 6-cylinder gasoline engine, both producing 75 hp gross. Transmission options include 5-speed sliding gear, hydrostatic, and a 10-speed two-speed power shift. The tractor offers power steering, dry disc brakes, and an open operator station with optional ROPS, canopy, or cab with air-conditioning. It has a 12 gpm open center hydraulic system, IH Fast Hitch rear hitch, and an independent 540 rpm rear PTO. Dimensions include a 103-inch wheelbase, 161-inch length, and weights ranging from 6780 to 7420 pounds depending on configuration.
Power75 hp
Founded1972 - 1976
Model666
Technical Specifications
Detailed specifications and technical data for Farmall 666
Power
| PTO (tested) | 69.61 hp (51.9 kW) |
|---|---|
| PTO (claimed) | 65 hp (gear) (48.5 kW), 69 hp (hydro) (51.5 kW) |
| Engine (gross) | 75 hp (55.9 kW) |
| Drawbar (tested) | 58.01 hp (43.3 kW) |
| Drawbar (claimed) | 57 hp (gear) (42.5 kW), 54 hp (hydro) (40.3 kW) |
Tires
| Ag rear | 15.5-38 |
|---|---|
| Ag front | 7.50-16 |
Engine
| Rated RPM | 2000 |
|---|---|
| Air cleaner | dual stage dry |
| Bore/Stroke | 3.875x4.410 inches (98 x 112 mm) |
| Compression | 17:1 |
| Fuel system | direct injection |
| Displacement | 312 ci (5.1 L) |
| Gas Fuel tank | 33 gal (124.9 L) |
| Power (gross) | 75 hp (55.9 kW) |
| Starter volts | 12 |
| Engine options | International Harvester 5.1L 6-cyl diesel, International Harvester 4.8L 6-cyl gasoline |
| Coolant capacity | 21 qts (19.9 L) |
| Diesel Fuel tank | 31 gal (117.3 L) |
| Rated RPM gasoline | 2000 |
| Air cleaner gasoline | dual stage dry |
| Bore/Stroke gasoline | 3.75x4.39 inches (95 x 112 mm) |
| Compression gasoline | 7.5:1 |
| Displacement gasoline | 291 ci (4.8 L) |
| Power (gross) gasoline | 75 hp (55.9 kW) |
| Starter volts gasoline | 12 |
| Coolant capacity gasoline | 21 qts (19.9 L) |
| International Harvester C291 | gasoline, 6-cylinder, liquid-cooled |
| International Harvester D312 | diesel, 6-cylinder, liquid-cooled |
Dimensions
| Width | 87 inches (220 cm) |
|---|---|
| Length | 161 inches (408 cm) |
| Wheelbase | 103 inches (261 cm) |
| Rear tread | 50 to 96 inches (127 to 243 cm) |
| Front tread | 50 to 74 inches (127 to 187 cm), 56 to 80 inches (142 to 203 cm) |
| Shipping weight | 6780 lbs (gas gear) (3075 kg), 7420 lbs (diesel hydro) (3365 kg) |
| Clearance (drawbar) | 14 inches (35 cm) |
| Clearance (front axle) | 21 inches (53 cm) |
| Height (steering wheel) | 77 inches (195 cm) |
Electrical
| Battery volts | 12 |
|---|---|
| Charging system | alternator |
Hydraulics
| Type | open center |
|---|---|
| Pump flow | 12 gpm (45.4 lpm) |
Mechanical
| Drive | Two-wheel drive |
|---|---|
| Brakes | Dry disc brakes |
| Steering | Power steering |
| Operator station | Open operator station. Two-post ROPS or canopy optional. Cab available with air-conditioning. |
Production
| Type | Row-Crop tractor |
|---|---|
| Built in | Rock Island, Illinois, USA |
| Total built | 9,367 |
| Original price | $11,875 |
| Years produced | 1972 - 1976 |
Transmission
| Clutch | dry disc |
|---|---|
| Hydrostatic | infinite forward and reverse |
| Sliding gear | 5 forward and 1 reverse |
| Torque-Amplifier | two-speed power shift, 10 forward and 2 reverse |
| Transmission options | 5-speed, hydrostatic, 10-speed two-speed power shift |
Tractor hitch
| Type | IH Fast Hitch |
|---|---|
| Rear Type | II |
Serial Numbers
| 1972 | 7500 |
|---|---|
| 1973 | 8200 |
| 1974 | 11585 |
| 1975 | 13131 |
| 1976 | 15739 |
| Location | Clutch housing, right side |
Power Take-off (PTO)
| Rear PTO | independent |
|---|---|
| Rear PTO Type | 540 (1.375) |