Compare/International Harvester 3688 vs International Harvester 986B

International Harvester 3688 vs International Harvester 986B

Verdict: International Harvester 3688 vs International Harvester 986B

The International Harvester 3688 and the International Harvester 986B are both tractors — here is how they stack up on the figures that matter. International Harvester 986B leads on rated power with 115 hp against 114 hp. International Harvester 986B is the lighter machine (5,640 kg vs 11,300 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. In short: choose the International Harvester 986B for outright pulling power, or the International Harvester 3688 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

114 hp

115 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

International HarvesterReference

With 18.4-34R1 rear tires.Reference

liquid-cooledReference

Total built

2,572Reference

328Reference

Final drives

bull gearReference

—

Differential lock

rearReference

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Variants

3688 Hi-Clear

high-clearance modelReference

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Engine

Drawbar (claimed)

74.7 kWReference

76.8 kWReference

Drawbar (tested)

74.0 kWReference

—

Displacement

7.1 LReference

5.9 LReference

Bore/Stroke

109 x 127 mmReference

98 x 129 mmReference

Air cleaner

dual dry elmementReference

—

Compression

16:1Reference

—

Rated RPM

2400Reference

2500Reference

Idle RPM

900-2400Reference

—

Starter volts

12Reference

Coolant capacity

24.6 LReference

—

Oil capacity

85.2 LReference

—

Power at rated engine speed

84.8 kWReference

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Max power

74.0 kWReference

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Engine

—

99.2 kWReference

Power

—

99.2 kWReference

Fuel system

—

direct injectionReference

Torque

—

450.1 NmReference

Torque RPM

—

1600Reference

Starter

—

electricReference

Transmission

Gears

16 forward and 8 reverseReference

Clutch

355.6mm cerametallic discReference

—

Transmission

—

International Harvester Torque AmplifierReference

PTO & Hydraulics

PTO (claimed)

84.3 kWReference

85.8 kWReference

PTO (tested)

84.8 kWReference

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Hydraulic system

85.2 LReference

Type

partial power shiftReference

two-speed power shiftReference

Capacity

85.2 LReference

Valves

2 to 4Reference

—

Pump flow

68.1 lpmReference

—

Total flow

102.2 lpmReference

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Steering flow

45.4 lpmReference

—

Rear Type

IIReference

IIIReference

Control

draft sensingReference

—

Rear PTO

independentReference

—

Rear PTO Type

540/1000 (1.375)Reference

540/1000Reference

Engine RPM

1000@2100Reference

—

Power at rated PTO speed

83.9 kWReference

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Rear valves

—

2Reference

Rear lift (at ends)

—

2844 kgReference

Capacities

Fuel

189.2 LReference

—

Dimensions

Wheelbase

266 cmReference

—

Weight

11300 to 13200 poundsReference

5640 kgReference

Front tire

11L-15Reference

11.00-16Reference

Rear tire

18.4-34Reference

23.1-34Reference

Ag front

11L-15Reference

—

Ag rear

18.4-34Reference

—

Length

467 cmReference

405 cmReference

Width

259 cmReference

258 cmReference

Height (cab)

284 cmReference

—

Shipping weight

5125 kgReference

5640 kgReference

Operating weight

5987 kgReference

—

Ground clearance

33 cmReference

55 cmReference

Rear axle

82 by 2997 mmReference

—

Front tread

152 to 213 cmReference

—

Rear tread

167 to 326 cmReference

—

Standard tires (ag)

—

Front: 11.00-16. Rear: 23.1-34Reference

3688 Serial Numbers

1981

501Reference

—

1982

1743Reference

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1983

2482Reference

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1984

2695Reference

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1985

3068Reference

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Location:

Serial number plate on the right side of the tractor frame, ahead of the rear axle.Reference

—

Electrical

Ground

negativeReference

Battery volts

12Reference

Test results

Fuel use

26.9 l/hourReference

—

Max pull

5556 kgReference

—

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.