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Tractor · 1973Unverified

International Harvester Hydro 70

Name: International Harvester Hydro 70
Brand: International Harvester

International Harvester Hydro 70 — 66 Series · 90 hp. Reference specifications; pending source verification.

The International Harvester Hydro 70 is a tractor model that produces a rated output of 90 hp, placing it in the middle of its class for power. This model was manufactured from 1973 to 1976 and features a 6-cylinder diesel liquid-cooled engine, coupled with a hydrostatic transmission and two-wheel drive. The tractor's listed weight ranges from 7450 to 8200 pounds, and it is suited to tasks involving approximately 200–800 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

90 hp

Max power

40.2 kW

Weight

7450 to 8200 pounds

Catalogue coverage

Variants represented

Richest spec table

95 rows

Recorded power

90 hp

Transmissions

hydrostatic

Production years

1973-1976

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

Hover a source tag to verify

Overview

ManufacturerInternational HarvesterReference

Row-Crop tractorReference

Built in Rock Island, Illinois, USAReference

Original price$14,200Reference

Two-wheel driveReference

Power steeringReference

Differential dry disc brakesReference

Open operator station.Reference

Engine

International Harvester 4.8L 6-cyl gasolineReference

International Harvester 5.1L 6-cyl dieselReference

Engine (gross)67.1 kWReference

Drawbar (claimed)40.3 kWReference

Drawbar (tested)40.2 kWReference

International Harvester C-291Reference

gasolineReference

6-cylinderReference

liquid-cooled inineReference

Displacement4.8 LReference

Bore/Stroke95 x 112 mmReference

Power (gross)67.1 kWReference

Air cleanerdual stage dryReference

Compression7.5:1Reference

Rated RPM2400Reference

Idle RPM900-2400Reference

Starter volts12Reference

Oil capacity8.5 LReference

Coolant capacity19.9 LReference

International Harvester D-312Reference

dieselReference

liquid-cooled inlineReference

Displacement5.1 LReference

Bore/Stroke98 x 112 mmReference

Compression17:1Reference

Oil capacity11.4 LReference

Power at rated engine speed51.9 kWReference

Max power40.2 kWReference

Power at rated engine speed51.8 kWReference

Max power39.6 kWReference

Transmission

hydrostaticReference

TypehydrostaticReference

Gearsinfinite forward and reverse (2-range)Reference

Oil capacity75.7 LReference

PTO & Hydraulics

PTO (claimed)51.5 kWReference

PTO (tested)51.9 kWReference

Hydraulic system75.7 LReference

Typeopen centerReference

Capacity75.7 LReference

Rear valves2Reference

Pump flow22.7 lpmReference

Rear TypeIIReference

Rear PTOindependentReference

Rear PTO Type540 (1.375)Reference

Engine RPM540@1986Reference

Power at rated PTO speed47.8 kWReference

Power at rated PTO speed48.8 kWReference

Capacities

Gas Fuel124.9 LReference

Diesel Fuel117.3 LReference

Dimensions

Wheelbase261 cmReference

Weight7450 to 8200 poundsReference

Front tire7.50-16Reference

Rear tire15.5-38Reference

Ag front7.50-16Reference

Ag rear15.5-38Reference

Length408 cmReference

Width220 cmReference

Height (steering wheel)195 cmReference

Height (exhaust)264 cmReference

Clearance (drawbar)35 cmReference

Front tread147 to 208 cmReference

Rear tread142 to 243 cmReference

Rear tread142 to 274 cmReference

Gas Shipping3379 kgReference

Diesel Shipping3578 kgReference

Operating3719 kgReference

Hydro 70 Serial Number Location

Tractor clutch housing on right side.Reference

Hydro 70 Serial Numbers

19737501Reference

19747570Reference

19758681Reference

197610094Reference

FAQ: How to read a serial number table.Reference

Electrical

Charging systemalternatorReference

Charging amps37Reference

Test results

NTTL 1154: gasoline hydrostatic 2WDReference

NTTL 1155: diesel hydrostatic 2WDReference

Gasoline hydrostatic 2WDNovember 14 - December 3, 1973Link: Nebraska Tractor Test 1154 fileReference

PTO performanceReference

Fuel use26.1 l/hourReference

Fuel use22.0 l/hourReference

Drawbar performanceReference

Fuel use29.1 l/hourReference

Max pull3822 kgReference

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

Fuel use21.2 l/hourReference

Fuel use20.1 l/hourReference

Max pull3769 kgReference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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