Compare/International Harvester 686 vs International Harvester 784

International Harvester 686 vs International Harvester 784

Verdict: International Harvester 686 vs International Harvester 784

The International Harvester 686 and the International Harvester 784 are both tractors — here is how they stack up on the figures that matter. International Harvester 784 leads on rated power with 67 hp against 66 hp. International Harvester 686 is the lighter machine (3,524 kg vs 5,850 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. International Harvester 784 is the newer design (1977 vs 1976). In short: choose the International Harvester 784 for outright pulling power, or the International Harvester 686 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Acreage600 acBudgetMain crop / use

Fit & specs

International Harvester

Fit score

Best match

Clear

International Harvester

Fit score

Best match

Clear

Rated power

66 hp

67 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

International HarvesterReference

Total built

6,000Reference

—

With 15.5-38 rear tires.Reference

The Torque Amplifier (TA) provides a power shift (clutchless, on the move) from direct drive (DD) to a lower TA speed.Reference

Engine

Drawbar (tested)

43.3 kWReference

42.4 kWReference

Displacement

4.8 LReference

4.0 LReference

Bore/Stroke

95 x 112 mmReference

100 x 129 mmReference

Rated RPM

2000Reference

2400Reference

Starter volts

12Reference

Air cleaner

dryReference

Idle RPM

900-2000Reference

—

Oil capacity

60.6 LReference

34.1 LReference

Coolant capacity

19.9 LReference

13.6 LReference

Power at rated engine speed

49.5 kWReference

50.3 kWReference

Max power

43.0 kWReference

42.4 kWReference

Drawbar (claimed)

—

43.7 kWReference

Compression

—

15.5:1Reference

Transmission

Torque AmplifierReference

Gears

10 forward and 2 reverseReference

16 forward and 8 reverseReference

PTO & Hydraulics

PTO (tested)

49.5 kWReference

50.3 kWReference

Hydraulic system

60.6 LReference

34.1 LReference

Type

two-speed power shiftReference

Capacity

60.6 LReference

34.1 LReference

Total flow

45.4 lpmReference

—

Rear Type

IIReference

Rear PTO

independentReference

Rear PTO Type

540 (1.375)Reference

540/1000 (1.375)Reference

PTO (claimed)

—

50.3 kWReference

Valves

—

1 or 2Reference

Pump flow

—

58.3 lpmReference

Control

—

position and draft controlReference

Rear lift

—

1632 kgReference

Clutch

—

dry discReference

Power at rated PTO speed

—

45.7 kWReference

Capacities

Fuel

117.3 LReference

75.7 LReference

Dimensions

Wheelbase

261 cmReference

—

Weight

3524 kgReference

5850 to 7108 poundsReference

Front tire

7.50-16Reference

Rear tire

15.5-38Reference

16.9-30Reference

Ag front

7.50-16Reference

9.00-10 (low-profile)Reference

Ag rear

15.5-38Reference

18.4-16.1 (low-profile)Reference

Length

411 cmReference

—

Width

227 cmReference

—

Height (exhaust)

266 cmReference

—

Diesel Shipping weight

3524 kgReference

—

Ballasted weight

4690 kgReference

—

Front tread

147 to 208 cmReference

—

Rear tread

142 to 243 cmReference

—

Utility Wheelbase

—

223 cmReference

Row-crop Wheelbase

—

214 cmReference

4WD Wheelbase

—

216 cmReference

Low-profile Wheelbase

—

212 cmReference

Utility Length

—

360 cmReference

Row-crop Length

—

353 cmReference

4WD Length

—

376 cmReference

Low-profile Length

—

360 cmReference

Utility Width

—

187 cmReference

Row-crop Width

—

190 cmReference

4WD Width

—

187 cmReference

Low-profile Width

—

199 cmReference

Utility Ground clearance

—

45 cmReference

Row-crop Ground clearance

—

50 cmReference

4WD Ground clearance

—

47 cmReference

Low-profile Ground clearance

—

27 cmReference

Bar rear axle

—

69 mmReference

Utility Shipping

—

2698 kgReference

Row-crop Shipping

—

2812 kgReference

4WD Shipping

—

3224 kgReference

Low-profile Shipping

—

2653 kgReference

Ballasted

—

4499 kgReference

Utility Steering wheel

—

160 cmReference

Row-crop Steering wheel

—

165 cmReference

4WD Steering wheel

—

160 cmReference

Low-profile Steering wheel

—

143 cmReference

686 Serial Numbers

1976

7500Reference

—

1977

7729Reference

—

1978

9899Reference

501Reference

1979

11417Reference

1442Reference

1980

12923Reference

2752Reference

Location:

Clutch housing on right side.Reference

Serial number plate on the right side of the frame, above the front axle.Reference

Test results

Fuel use

15.5 l/hourReference

14.8 l/hourReference

Max pull

3634 kgReference

—

Speeds

784 Serial Numbers

1981

—

5906Reference

1982

—

8001Reference

1983

—

8219Reference

Electrical

Ground

—

negativeReference

Battery volts

—

12Reference

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.