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Farmall 1066 vs Farmall 1566
Verdict: Farmall 1066 vs Farmall 1566
The Farmall 1066 and the Farmall 1566 are both tractors — here is how they stack up on the figures that matter. Farmall 1566 leads on rated power with 161 hp against 116 hp. Farmall 1066 is the lighter machine (12,148 kg vs 13,200 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. In short: choose the Farmall 1566 for outright pulling power, or the Farmall 1066 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.
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Fit & specs
Farmall
85
Fit score
Best match
Clear
Farmall
85
Fit score
Best match
Clear
Rated power
116 hp
161 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
Farmall (a part of International Harvester)Reference
Farmall (a part of International Harvester)Reference
Four gears (1-4) in two ranges (Low/High) with the two-speed Torque Amplifier power shift (TA/direct).Reference
With 20.8-38 rear tires.Reference
Total built
54,947Reference
7,417Reference
Final drives
—
planetaryReference
Engine
Fuel tank
159.0 LReference
310.4 LReference
Drawbar (claimed)
80.5 kWReference
—
Drawbar (tested)
79.0 kWReference
102.2 kWReference
Displacement
6.8 LReference
7.1 LReference
Bore/Stroke
109 x 121 mmReference
109 x 127 mmReference
Air cleaner
dual stage dryReference
—
Rated RPM
2600 (after 1973)Reference
2600Reference
Starter volts
12Reference
—
Oil capacity
17.0 LReference
18.9 LReference
Coolant capacity
23.7 LReference
24.6 LReference
Power at rated engine speed
93.7 kWReference
120.1 kWReference
Max power
79.0 kWReference
102.2 kWReference
Engine
—
136.5 kWReference
Power
—
136.5 kWReference
Compression
—
16:1Reference
Idle RPM
—
900-2600Reference
Transmission
Gears
infinite forward and reverse (two-range)Reference
12 forward and 6 reverseReference
Clutch
dry discReference
—
Transmission
Torque AmplifierReference
Torque AmplifierReference
PTO & Hydraulics
PTO (claimed)
94.0 kWReference
119.3 kWReference
PTO (tested)
93.7 kWReference
120.1 kWReference
Type
hydrostaticReference
two-speed power shiftReference
Pump flow
45.4 lpmReference
45.4 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
121.0 kWReference
Rear valves
—
2Reference
Front valves
—
2Reference
Control
—
lower-link draft sensingReference
Engine RPM
—
1000@2300Reference
Dimensions
Wheelbase
266 cmReference
266 cmReference
Weight
12148 to 13345 poundsReference
13200 to 15195 poundsReference
Front tire
11L-15Reference
11L-15Reference
Rear tire
18.4-38Reference
20.8-38Reference
Ag front
11L-15Reference
11L-15Reference
Ag rear
18.4-38Reference
20.8-38Reference
Length
419 cmReference
426 cmReference
Width
248 cmReference
284 cmReference
Height (exhaust)
281 cmReference
317 cmReference
Clearance (drawbar)
40 cmReference
43 cmReference
Bar rear axle
82 mmReference
—
Operating
6053 kgReference
6892 kgReference
Ballasted
6921 kgReference
8282 kgReference
Height (cab)
—
297 cmReference
Front tread
—
142 to 203 cmReference
Rear tread
—
167 to 304 cmReference
Shipping
—
5987 kgReference
1066 Serial Number Location
1066 Serial Numbers
1971
7101Reference
—
1972
12677Reference
—
1973
24205Reference
—
1974
34949Reference
7101Reference
1975
46855Reference
7837Reference
1976
56672Reference
12589Reference
Test results
Fuel use
31.4 l/hourReference
41.3 l/hourReference
Max pull
5896 kgReference
7155 kgReference
Speeds
1566 Serial Numbers
Location:
—
Serial number plate on the left side of the clutch housing.Reference
Electrical
Charging system
—
alternatorReference
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.