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International Harvester 1066 vs International Harvester 1256
Verdict: International Harvester 1066 vs International Harvester 1256
The International Harvester 1066 and the International Harvester 1256 are both tractors — here is how they stack up on the figures that matter. Both are rated at the same 116 hp. International Harvester 1256 is the lighter machine (9,940 kg vs 12,148 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. International Harvester 1066 is the newer design (1971 vs 1967). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.
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Fit & specs
International Harvester
85
Fit score
Best match
Clear
International Harvester
85
Fit score
Best match
Clear
Rated power
116 hp
116 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
International HarvesterReference
International HarvesterReference
Four gears (1-4) in two ranges (Low/High) with the two-speed Torque Amplifier power shift (TA/direct).Reference
Four gears (1-4) in two ranges (low/high) plus reverse range. The Torque Amplifier (TA) allows a clutchless shift from direct drive (DD) to the lower TA speed in all gears and ranges.Reference
Total built
54,947Reference
—
Variants
1066 Hi-Clear
high-cropReference
—
Farmall 1256
—
row-cropReference
IH 1256
—
standardReference
Engine
Fuel tank
159.0 LReference
159.0 LReference
Drawbar (claimed)
80.5 kWReference
—
Drawbar (tested)
79.0 kWReference
76.1 kWReference
Displacement
6.8 LReference
6.7 LReference
Bore/Stroke
109 x 121 mmReference
110 x 117 mmReference
Air cleaner
dual stage dryReference
dual dry elementsReference
Rated RPM
2600 (after 1973)Reference
2400Reference
Starter volts
12Reference
12Reference
Oil capacity
17.0 LReference
64.4 LReference
Coolant capacity
23.7 LReference
22.7 LReference
Power at rated engine speed
93.7 kWReference
86.6 kWReference
Max power
79.0 kWReference
76.1 kWReference
Compression
—
17:1Reference
Transmission
Gears
infinite forward and reverse (two-range)Reference
16 forward and 8 reverseReference
Clutch
dry discReference
—
Transmission
Torque AmplifierReference
Torque AmplifierReference
PTO & Hydraulics
PTO (claimed)
94.0 kWReference
84.3 kWReference
PTO (tested)
93.7 kWReference
86.6 kWReference
Type
hydrostaticReference
partial power shiftReference
Pump flow
45.4 lpmReference
30.3 lpmReference
Total flow
79.5 lpmReference
—
Steering flow
34.1 lpmReference
—
Rear Type
III/IIReference
III/IIReference
Rear lift (at 24"/610mm)
2540 kgReference
—
Rear PTO
independentReference
independentReference
Rear PTO Type
540/1000Reference
1000Reference
Power at rated PTO speed
88.9 kWReference
84.5 kWReference
Valves
—
1Reference
Engine RPM
—
1000@2100Reference
Dimensions
Wheelbase
266 cmReference
233 cmReference
Weight
12148 to 13345 poundsReference
9940 to 11030 poundsReference
Front tire
11L-15Reference
10.00-16Reference
Rear tire
18.4-38Reference
18.4-38 (Farmall)Reference
Ag front
11L-15Reference
—
Ag rear
18.4-38Reference
—
Length
419 cmReference
416 cmReference
Width
248 cmReference
233 cmReference
Height (exhaust)
281 cmReference
—
Clearance (drawbar)
40 cmReference
—
Bar rear axle
82 mmReference
82 mmReference
Operating
6053 kgReference
4719 kgReference
Ballasted
6921 kgReference
6264 kgReference
Standard tires (ag)
—
Front: 11.00-16. Rear: 24.5-32 (International)Reference
Height (steering wheel)
—
218 cmReference
Shipping
—
5003 kgReference
1066 Serial Number Location
1066 Serial Numbers
1971
7101Reference
—
1972
12677Reference
—
1973
24205Reference
—
1974
34949Reference
—
1975
46855Reference
—
1976
56672Reference
—
Test results
Fuel use
31.4 l/hourReference
28.8 l/hourReference
Max pull
5896 kgReference
5036 kgReference
Speeds
1256 Serial Numbers
1967
—
7501 (IH)Reference
1968
—
7703 (IH)Reference
1969
—
8444 (IH)Reference
Location:
—
Serial number place on the left side of the 1256, on the clutch housing.Reference
Electrical
Charging system
—
alternatorReference
Charging amps
—
55Reference
Batteries
—
2Reference
Battery volts
—
6Reference
Battery AH
—
204Reference
Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.