International Harvester 660 Specs ( 1959-1963 )
Overview
The International Harvester 660 is a standard-tread farm tractor manufactured between 1959 and 1963 with a total production of 6,945 units. It was available with gasoline, diesel, or LP gas 6-cylinder engines and featured either a 5-speed sliding gear or 10-speed Torque Amplifier transmission. The tractor was rated at 95 hp and recorded a maximum tested drawbar pull of 11,046 lbs during Nebraska Tractor Test evaluations.
Ideal Applications
Tested Power and Efficiency:
Nebraska Tractor Tests recorded maximum PTO performance at 81.39 hp for gasoline and 78.78 hp for diesel configurations, with fuel consumption rates ranging from 5.2 to 8.9 gallons per hour depending on fuel type and load.
Transmission and Drive Configuration:
The unit is equipped with a Torque Amplifier transmission providing 10 forward and 2 reverse gears, allowing for clutchless shifting between direct drive and a lower speed setting while in motion.
Weight and Physical Dimensions:
The tractor features an 85.5-inch wheelbase and 18.4/15-34 rear tires, with an operating weight that increases from 9,635 lbs to 15,255 lbs when fully ballasted.
Production
| Description | Standard-tread tractor |
|---|---|
| Manufacturer | International Harvester |
| Original price | $6,000 (1963) |
| Total built | 6,945 |
Engine
| Air cleaner | oil bath / oil bath / oil bath |
|---|---|
| Bore/Stroke | 3.5625x4.3906 inches (90 x 112 mm) / 3.6875x4.3906 inches (94 x 112 mm) / 3.5625x4.3906 inches (90 x 112 mm) |
| Compression | 7.2:1 / 18.2:1 / 8.75:1 |
| Coolant capacity | 20 qts (18.9 L) / 23 qts (21.8 L) / 21 qts (19.9 L) |
| Description | International Harvester C-263 / gasoline / 6-cylinder / liquid-cooled vertical L-head / International Harvester D-282 / diesel / 6-cylinder / liquid-cooled vertical L-head / International Harvester C-263 / LP gas / 6-cylinder / liquid-cooled vertical L-head |
| Displacement | 263 ci (4.3 L) / 282 ci (4.6 L) / 263 ci (4.3 L) |
| Firing order | 1-5-3-6-2-4 |
| Oil capacity | 9 qts (8.5 L) / 9 qts (8.5 L) / 9 qts (8.5 L) |
| Power | 95 hp (70.8 kW) / 95 hp (70.8 kW) / 95 hp (70.8 kW) |
| Rated RPM | 2400 / 2400 / 2400 |
| Torque | 219 lb-ft (297.0 Nm) / 219 lb-ft (297.0 Nm) / 212 lb-ft (287.5 Nm) |
| Torque RPM | 1300 / 1800 / 1200 |
| Engine type | International Harvester 4.3L 6-cyl gasoline / International Harvester 4.6L 6-cyl diesel / International Harvester 4.3L 6-cyl LP gas |
| Engine type | International Harvester 4.3L 6-cyl gasoline / International Harvester 4.6L 6-cyl diesel / International Harvester 4.3L 6-cyl LP gas |
| Fuel tank | 33 gal (gas/diesel) (124.9 L) |
| Drawbar (tested) | 70.21 hp (52.4 kW) |
| Plows | 6 |
| PTO (tested) | 81.39 hp (60.7 kW) |
Transmission
| Description | The Torque Amplifier (TA) provides a clutchless shift-on-the-move between direct drive (DD) and the lower TA speed. |
|---|---|
| Gears | 5 forward and 1 reverse / 10 forward and 2 reverse |
| Oil capacity | 64 qts (60.6 L) / 64 qts (60.6 L) |
| Transmission | sliding gear / Torque Amplifier |
| Transmission type | 5-speed / 10-speed |
| Transmission type | 5-speed / 10-speed |
Mechanical
| Cab | Open operator station. |
|---|---|
| Description | Independent mechanical disc brakes |
| Drive type | Two-wheel drive |
| Steering | manual |
Hydraulics
| Steering flow | 2.5 gpm (9.5 lpm) |
|---|---|
| Total flow | 12 gpm (45.4 lpm) |
| Valves | 1 |
PTO
| Rear PTO | independent |
|---|---|
| Rear PTO Type | 540 |
Dimensions & Tires
| Clearance (front axle) | 17.4 inches (44 cm) |
|---|---|
| Ground clearance | 19.7 inches (frame) (50 cm) |
| Height (steering wheel) | 74 inches (187 cm) |
| Length | 142.6 inches (362 cm) |
| Wheelbase | 85.5 inches (217 cm) |
| Width | 78 inches (min) (198 cm) |
| Front tire | 7.50-18 |
| Rear tire | 18.4/15-34 |
| Weight | 9635 to 9875 pounds |
| Wheelbase | 85.5 inches (217 cm) |
| Ag front | 7.50-18 |
| Ag rear | 18.4/15-34 |
| Industrial rear | 23.1/18-26 |
660 Serial Number Location
| Description | Right side of clutch housing |
|---|
660 Serial Numbers
| 1959 | 501 |
|---|---|
| 1960 | 3398 |
| 1961 | 4259 |
| 1962 | 5883 |
| 1963 | 6995 |
| Description | FAQ: How to read a serial number table. |
| Final | ? |
International Harvester 660 Weight
| Ballasted | 15,255 lbs (6919 kg) |
|---|---|
| Operating | 9,635 lbs (gas) (4370 kg) |
International Harvester 660 attachments
| Description | front-end loader |
|---|
Nebraska Tractor Test 715
| Description | Diesel TA 2WDAugust 31 - September 5, 1959Link: Nebraska Tractor Test 715 file / PTO performance / Drawbar performance / Gear 2-TA used for pull test. |
|---|---|
| Fuel use | 5.5 gal/hour (20.8 l/hour) / 5.2 gal/hour (19.7 l/hour) |
| Max power | 64.43 hp (48.0 kW) |
| Max pull | 11,046 lbs (5010 kg) |
| Power at rated engine speed | 78.78 hp (58.7 kW) |
Nebraska Tractor Test 721
| Description | Gasoline TA 2WDOctober 1 - 12, 1959Link: Nebraska Tractor Test 721 file / PTO performance / Drawbar performance |
|---|---|
| Fuel use | 6.4 gal/hour (24.2 l/hour) / 6.3 gal/hour (23.8 l/hour) |
| Max power | 70.21 hp (52.4 kW) |
| Power at rated engine speed | 81.39 hp (60.7 kW) |
Nebraska Tractor Test 722
| Description | LP gas TA 2WDOctober 3 - 12, 1959Link: Nebraska Tractor Test 722 file / PTO performance / Drawbar performance |
|---|---|
| Fuel use | 8.9 gal/hour (33.7 l/hour) / 8.8 gal/hour (33.3 l/hour) |
| Max power | 69.66 hp (51.9 kW) |
| Power at rated engine speed | 80.63 hp (60.1 kW) |
References
| Description | Buyers Guide International Industrial Tractors & Equipment published in 1960, by International Harvester / Industrial Tractors and matched equipment published in 1960, by International Harvester / Industrial Tractors & Equipment Buyers Guide published in 1962, by International Harvester / Direct-Start Diesel Tractors published in 1958, by International Harvester |
|---|
Speeds
| Description | With 18.4/15-34 rear tires. / With 18.4/15-34 rear tires. |
|---|
Tractor Tests
| Description | NTTL 715: diesel TA 2WD / NTTL 721: gasoline TA 2WD / NTTL 722: LP gas TA 2WD |
|---|