Compare/Farmall 666 vs Farmall 706

Farmall 666 vs Farmall 706

Verdict: Farmall 666 vs Farmall 706

The Farmall 666 and the Farmall 706 are both tractors — here is how they stack up on the figures that matter. Farmall 706 leads on rated power with 89 hp against 75 hp. Farmall 666 is the lighter machine (6,780 kg vs 7,530 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Farmall 666 is the newer design (1972 vs 1963). In short: choose the Farmall 706 for outright pulling power, or the Farmall 666 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Farmall

Fit score

Best match

Clear

Farmall

Fit score

Best match

Clear

Rated power

75 hp

89 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Farmall (a part of International Harvester)Reference

Diesel hydrostatic 2WDNovember 14 - December 3, 1973Link: Nebraska Tractor Test 1155 fileReference

The Torque Amplifier (TA) provides a hydraulically-actuted under-drive that may be shifted, on the move, with any range and speed selection in the main transmission. Using the TA does not require the clutch or stopping the tractor. With the lever in the forward position, the TA is disengaged and the transmission is in direct drive. To slow the tractor (increasing pulling power) the TA lever should be pulled smoothly and quickly to the rear, engaging the TA. To disengage the TA and return to direct-drive, the TA should be moved forward, with a slight pause at the center position of the lever.Reference

Total built

9,367Reference

45,053Reference

Original price

$11,875Reference

—

Engine

Gas Fuel tank

124.9 LReference

—

Diesel Fuel tank

117.3 LReference

—

Engine (gross)

55.9 kWReference

66.4 kWReference

Drawbar (claimed)

40.3 kWReference

48.5 kWReference

Drawbar (tested)

43.3 kWReference

50.3 kWReference

Displacement

4.8 LReference

Bore/Stroke

95 x 112 mmReference

Power (gross)

55.9 kWReference

66.4 kWReference

Fuel system

direct injectionReference

—

Air cleaner

dual stage dryReference

Compression

7.5:1Reference

Rated RPM

2000Reference

2300Reference

Starter volts

12Reference

Coolant capacity

19.9 LReference

Power at rated engine speed

51.8 kWReference

57.1 kWReference

Max power

39.6 kWReference

49.0 kWReference

Idle RPM

—

900-2300Reference

Firing order

—

1-5-3-6-2-4Reference

Intake valve clearance

—

0.686 mmReference

Exhaust valve clearance

—

0.686 mmReference

Oil capacity

—

64.4 LReference

Sparkplug gap

—

0.381 mmReference

Point gap

—

0.508 mmReference

Transmission

Torque-AmplifierReference

Torque AmplifierReference

Gears

10 forward and 2 reverseReference

16 forward and 8 reverseReference

Clutch

dry discReference

12-inch dry discReference

Oil type

—

IH Hy-TranReference

PTO & Hydraulics

PTO (claimed)

51.5 kWReference

54.8 kWReference

PTO (tested)

51.9 kWReference

57.1 kWReference

Type

two-speed power shiftReference

IH Fast HitchReference

Pump flow

45.4 lpmReference

11.4 lpmReference

Rear Type

IIReference

2Reference

Rear PTO

independentReference

Rear PTO Type

540 (1.375)Reference

1000Reference

Power at rated PTO speed

48.8 kWReference

53.5 kWReference

Hydraulic system

—

64.3 LReference

Capacity

—

64.3 LReference

Valves

—

1 or 2Reference

Steering flow

—

34.1 lpmReference

Engine RPM

—

1000@2100Reference

Dimensions

Wheelbase

261 cmReference

—

Weight

6780 to 7420 poundsReference

7530 to 9160 poundsReference

Front tire

7.50-16Reference

6.50-16Reference

Rear tire

15.5-38Reference

Ag front

7.50-16Reference

—

Ag rear

15.5-38Reference

Length

408 cmReference

—

Width

220 cmReference

279 cmReference

Height (steering wheel)

195 cmReference

—

Shipping weight

3365 kgReference

—

Clearance (front axle)

53 cmReference

—

Clearance (drawbar)

35 cmReference

—

Front tread

142 to 203 cmReference

Rear tread

127 to 243 cmReference

142 to 243 cmReference

2WD Wheelbase

—

247 cmReference

4WD Wheelbase

—

240 cmReference

2WD Ag front

—

6.50-16Reference

4WD Ag front

—

11.2-24Reference

2WD Length

—

398 cmReference

4WD Length

—

408 cmReference

2WD Height (steering wheel)

—

203 cmReference

4WD Height (steering wheel)

—

207 cmReference

Ground clearance

—

43 cmReference

2WD Clearance (front axle)

—

53 cmReference

2WD Clearance (drawbar)

—

33 cmReference

Shipping

—

3529 kgReference

Operating

—

4154 kgReference

Ballasted

—

4858 kgReference

666 Serial Numbers

1972

7500Reference

—

1973

8200Reference

—

1974

11585Reference

—

1975

13131Reference

—

1976

15739Reference

—

Location:

Clutch housing, right sideReference

—

Electrical

Charging system

alternatorReference

—

Battery volts

12Reference

6 (diesel)Reference

Ground

—

negativeReference

Charging amps

—

32 (alternator)Reference

Batteries

—

2 (diesel)Reference

Battery AH

—

130 (diesel)Reference

Test results

Fuel use

20.1 l/hourReference

22.0 l/hourReference

Max pull

3769 kgReference

3804 kgReference

Variants

Farmall 706

—

row-cropReference

IH 706

—

standard-treadReference

IH 2706

—

industrialReference

706 Hi-Clear

—

high-cropReference

Capacities

Fuel

—

147.6 LReference

Diameter

—

27 cmReference

RPM

—

1055Reference

Speed

—

925.98 meters/minReference

Farmall 706 attachments

706 Serial Number Location

706 Serial Numbers

1963

—

501Reference

1964

—

7073Reference

1965

—

21162Reference

1966

—

30288Reference

1967

—

38521Reference

Final

—

46647Reference

Speeds

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.