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Farmall 966 vs Farmall Hydro 100
Verdict: Farmall 966 vs Farmall Hydro 100
The Farmall 966 and the Farmall Hydro 100 are both tractors — here is how they stack up on the figures that matter. Farmall Hydro 100 leads on rated power with 104 hp against 96 hp. Farmall 966 is the lighter machine (11,116 kg vs 11,470 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Farmall Hydro 100 is the newer design (1973 vs 1971). In short: choose the Farmall Hydro 100 for outright pulling power, or the Farmall 966 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
96 hp
104 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
Farmall (a part of International Harvester)Reference
International HarvesterReference
The hydrostatic transmission option ended in 1973 when the Hydro 100 began production.Reference
Gear 2.85 MPH used for pull test.Reference
Total built
21,017Reference
—
Differential lock
—
mechanical rearReference
Engine
Engine
84.3 kWReference
—
Drawbar (claimed)
62.6 kWReference
59.7 kWReference
Drawbar (tested)
63.5 kWReference
58.4 kWReference
Displacement
6.8 LReference
7.1 LReference
Bore/Stroke
109 x 121 mmReference
109 x 127 mmReference
Power
84.3 kWReference
—
Air cleaner
dual dry elementsReference
dual stage dryReference
Rated RPM
2600 (late)Reference
2400Reference
Firing order
1-5-3-6-2-4Reference
—
Oil capacity
85.2 LReference
102.2 LReference
Coolant capacity
22.7 LReference
24.6 LReference
Power at rated engine speed
75.2 kWReference
77.7 kWReference
Max power
63.5 kWReference
58.4 kWReference
Compression
—
15.8:1Reference
Idle RPM
—
900-2400Reference
Starter volts
—
12Reference
Transmission
Gears
infinite forward and reverseReference
infinite forward and reverse (2-range)Reference
Clutch
dry discReference
—
Transmission
Torque AmplifierReference
—
PTO & Hydraulics
PTO (claimed)
70.8 kWReference
77.6 kWReference
PTO (tested)
75.2 kWReference
77.7 kWReference
Hydraulic system
85.2 LReference
102.2 LReference
Type
hydrostaticReference
hydrostaticReference
Capacity
85.2 LReference
102.2 LReference
Pressure
137.9 barReference
—
Valves
1 to 4Reference
—
Pump flow
45.4 lpmReference
45.4 lpmReference
Total flow
79.5 lpmReference
—
Steering flow
34.1 lpmReference
—
Steering press.
106.9 barReference
—
Rear Type
IIReference
IIReference
Rear lift (at 24"/610mm)
1995 kgReference
—
Rear lift
2268 kgReference
—
Rear PTO
independentReference
independentReference
Rear PTO Type
540/1000Reference
540/1000 (1.375)Reference
Power at rated PTO speed
75.7 kWReference
75.5 kWReference
Rear valves
—
2Reference
Control
—
lower-link draft sensingReference
Engine RPM
—
1000@2072Reference
Capacities
Fuel
140.0 LReference
159.0 LReference
Dimensions
Wheelbase
266 cmReference
266 cmReference
Weight
11116 to 11700 poundsReference
11470 to 12130 poundsReference
Front tire
9.5L-15Reference
10.00-16Reference
Rear tire
18.4-34Reference
18.4-34Reference
Ag front
9.5L-15Reference
10.00-16Reference
Ag rear
18.4-34Reference
18.4-34Reference
Length
419 cmReference
426 cmReference
Width
248 cmReference
259 cmReference
Height (exhaust)
266 cmReference
274 cmReference
Ground clearance
35 cmReference
—
Operating
5307 kgReference
—
Ballasted
6123 kgReference
—
Height (cab)
—
289 cmReference
Shipping weight
—
5202 kgReference
Operating weight
—
5502 kgReference
Clearance (drawbar)
—
35 cmReference
Bar rear axle
—
82 mmReference
Front tread
—
152 to 213 cmReference
Rear tread
—
167 to 325 cmReference
966 Serial Numbers
1971
7101Reference
—
1972
11815Reference
—
1973
17794Reference
7501Reference
1974
22526Reference
7727Reference
1975
28119Reference
10915Reference
1976
31772Reference
12434Reference
Location:
Clutch housing, left sideReference
Serial number plate on the left side of the transmission housing.Reference
Electrical
Charging amps
32Reference
72Reference
Batteries
2Reference
—
Battery volts
6Reference
—
Battery AH
172Reference
—
Charging system
—
alternatorReference
Test results
Fuel use
26.1 l/hourReference
25.7 l/hourReference
Max pull
4552 kgReference
4445 kgReference
Speeds
Hydro 100 Serial Numbers
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.