- WhichTractor size: Standard-size
- No lab test on file
- 1972–1976
- 9,367 built
WhichTractor size, not the maker’s category
Derived by WhichTractor from a sourced three-point linkage. How we decide what a machine is
International Harvester 666 specs: hp, weight, years
INTERNATIONAL HARVESTER C-291 six-cylinder. The manufacturer claimed 66.1 horsepower. No laboratory has tested one, so there is no measured figure at the shaft.
Engine power, claimed · gross or net not stated
66.1 hp
49.3 kW as stated by the source
No lab test on file
Claimed · standard not stated by the source
Source · Traktorenlexikon, “IHC 666”, claimed
This is the maker’s own figure, measured at the engine. Power at the PTO is lower — by how much, for this machine, nobody has measured.
- Weight
- 8,199 lb
- Hyd. flow
- 12.0 gpm
- Top speed
- 18.6 mph
International Harvester 666 specs: key facts
The International Harvester 666 was built from 1972 to 1976.
The International Harvester 666 has a claimed engine power (gross or net not stated) of 49.3 kW (66.1 hp); it has no measured PTO figure.
The International Harvester 666 is two-wheel drive (2WD).Source 1
The International Harvester 666 has a INTERNATIONAL HARVESTER C-291 engine, a 6-cylinder unit.Source 2
The International Harvester 666 weighs 3,719 kg (8,199 lb) unladen.Source 1
The International Harvester 666 has a rear PTO running at 540 rpm.
The hydraulic pump of the International Harvester 666 delivers 45.5 L/min (12.0 gpm).Source 1
Source · Traktorenlexikon, “IHC 666”
How does the 666 compare with its class?
- Limitation:
Five forward gears is low for its class — 58% below the median of 12 across the 340 machines within 10% of its power that hold this figure.
- Strength:
A 117 L fuel tank is high for its class — 47% above the median of 80 L across the 324 machines within 10% of its power that hold this figure.
- Worth knowing:
An unladen mass of 3,719 kg is high for its class — 31% above the median of 2,840 kg across the 347 machines within 10% of its power that hold this figure.
Derived by WhichTractor from 347 comparable records. How we work this out
How much horsepower does a 666 have?
The only figure for the 666 is 66.1 hp (49.3 kW) of claimed engine power, gross or net not stated, no test standard stated — not power at the shaft.
Source · Traktorenlexikon, “IHC 666”
What engine is in a 666?
A 666 has an INTERNATIONAL HARVESTER C-291, a 6-cylinder engine.
| Make & model | INTERNATIONAL HARVESTER C-291 |
|---|---|
| Cylinders | 6, liquid-cooledSource 3 |
| Electrical system | 12 VSource 3 |
Source · Traktorenlexikon, “Farmall Farmall 756”
How much will a 666 lift, and what is its hydraulic flow?
Hydraulic and PTO specifications for the 666 are below.
| Pump flow | 12.0 gpm · 45.5 L/min |
|---|---|
| Hitch category | Category 2 |
| Rear PTO | 540 rpm @ 1,650 engine rpmSource 3 |
| PTO shaft | 1 3/8"- 6 splines |
Source · Traktorenlexikon, “Farmall Farmall 666”
What transmission does a 666 have?
Transmission specifications for the 666 are below.
| Clutch | Pedal-operated dry single-plate clutchSource 1 |
|---|---|
| Brakes | Hydraulically operated disc brakes acting on differential side shaftsSources disagreeHydraulically operated disc brakes acting on the differential side shafts (Traktorenlexikon, “Farmall Farmall 666”) |
| Top speed | 18.6 mph · 30 km/h |
Source · Traktorenlexikon, “IHC 666”
How much does a 666 weigh?
A 666 weighs 8,199 lb (3,719 kg) unladen.
| Unladen weight | 8,199 lb · 3,719 kgSource 1 |
|---|---|
| Wheelbase | 103.0 in · 2,616 mmSource 1 |
| Length | 161.0 in · 4,089 mm |
| Width | 87.0 in · 2,210 mm |
| Height | 77.0 in · 1,956 mm |
| Ground clearance | 21.0 in · 533 mmSource 1 |
| Front track | 58.0–82.0 in · 1,473–2,083 mmSource 1 |
| Rear track | 60.0–98.0 in · 1,524–2,489 mm |
| Turning radius, braked | 12.0 ft · 3.66 m |
Source · Traktorenlexikon, “IHC 666”
What oil does a 666 take, and how much?
A 666 engine takes 10.7 qt (10.1 L). Single source, not independently verified — always confirm against the operator’s manual for your machine.
| System | Capacity |
|---|---|
| Engine oil | 10.7 qt · 10.1 LSource: Traktorenlexikon, “IHC 666” · single source, not independently verified |
| Cooling system | 21.0 qt · 19.9 LSource: Traktorenlexikon, “Farmall Farmall 666” · single source, not independently verified |
Always confirm against the operator’s manual for your machine before service.
Which tractors compare with a 666?
Within 10% of its 66.3 hp at the PTO as the maker claimed it, with no laboratory test on file, the same type, and first built within 15 years of it.
- URSUS C-38566.3 hp PTO, claimed · 1969–1983Side by side with the 666 →
- International Harvester 68666.3 hp PTO, claimed · 1976–1980Side by side with the 666 →
- Lamborghini R-475 (DT)66.2 hp PTO, claimed · 1971–1973Side by side with the 666 →
- Steyr 870 (a)66.1 hp PTO, claimed · 1971–1975Side by side with the 666 →
- Steyr Plus 7066.1 hp PTO, claimed · 1968–1975Side by side with the 666 →
- SAME Jaguar 95 (DT)66.0 hp PTO, claimed · 1979–1982Side by side with the 666 →
Common questions about the International Harvester 666
Is a 666 two-wheel drive or four-wheel drive?
The International Harvester 666 is two-wheel drive (2WD).
What PTO does a 666 have?
A 666 has a 540 rpm rear PTO on a 1 3/8"- 6 splines shaft.
Sources and how this page was built
Compiled from Traktorenlexikon, “Farmall Farmall 756”; Traktorenlexikon, “IHC 666”; and Traktorenlexikon, “Farmall Farmall 666”.
Sources
Facts taken from these documents, units converted. Numbers beside a figure refer to this list. Licences and attribution
- Traktorenlexikon: Farmall Farmall 666 — CC BY-SA 4.0, WIKIBOOKS-TL-118860 · revision 1034709. Wikibooks contributors (Traktorenlexikon). Original document
- Traktorenlexikon: Farmall Farmall 756 — CC BY-SA 4.0, WIKIBOOKS-TL-118751 · revision 1054991. Wikibooks contributors (Traktorenlexikon). Original document
- Traktorenlexikon: IHC 666 — CC BY-SA 4.0, WIKIBOOKS-TL-118859 · revision 1034710. Wikibooks contributors (Traktorenlexikon). Original document