International Harvester 674 Tractor Specs (1973-1977)

International Harvester 674 Quick Answers

• What engines were offered in the IH 674?The listed engines are the International Harvester D-239 four-cylinder diesel at 239 cu in (3.9 L) and the C-200 four-cylinder gasoline engine at 200.3 cu in (3.3 L). Both are listed at 2,400 rpm.
• How much horsepower does an IH 674 have?Official Nebraska Test 1128 recorded 58.53 PTO hp at rated engine speed and 51.97 maximum-available drawbar hp for the gasoline 8-speed tractor. Test 1129 recorded 61.56 PTO hp and 54.45 drawbar hp for the diesel 8-speed tractor. Those are separate, tested configurations rather than one model-wide rating.
• What transmission does an IH 674 use?The 674 is listed with a gear transmission offering 8 forward and 4 reverse gears, plus a dry-disc clutch. Match the transmission to the individual tractor before using a service or parts detail.
• What PTO does an IH 674 use?It is listed with an independent rear PTO and a 540 (1.375) PTO shaft. Confirm the fitted PTO equipment before matching an implement.
• What is the IH 674 fuel capacity?The listed fuel-tank capacity is 20 gal (75.7 L). Capacity alone does not establish the correct fuel, fill procedure, or maintenance practice for either engine.
• Where are IH 674 serial numbers listed by year?Published year-start serials are 100001 (1973), 101862 (1974), 103172 (1975), 105946 (1976), and 107555 (1977). The serial plate is listed on the left side of the transmission housing.
• Which Nebraska tests cover an IH 674?The University of Nebraska archive lists Test 1128 for International 674 Utility and Row Crop Gasoline tractors, and Test 1129 for International 674 Utility and Row Crop Diesel tractors. Both reports are for 8-speed, two-wheel-drive configurations tested in 1973.
• Which manuals are available for the IH 674?Reviewed previews identify IH-O-674 operator material, TC-163 parts-catalog material, a 674 chassis-service manual, and a multi-model D-239 engine-service manual. Use the complete serial-matched publication for settings, procedures, and part-number decisions.

Engine and Power

The 674 has separately listed D-239 diesel and C-200 gasoline four-cylinder engines. The diesel displaces 239 cu in (3.9 L), while the gasoline engine displaces 200.3 cu in (3.3 L); both are listed at 2,400 rpm. Keep the fuel type with every capacity, service, and test comparison.

Transmission

The published 674 transmission is an 8-forward, 4-reverse gear drive with a dry-disc clutch. Both official Nebraska reports are for 8-speed, two-wheel-drive tractors, so their results do not automatically describe a differently equipped machine.

PTO and Hitch

The model is listed with an independent rear PTO and a 540 (1.375) shaft. The 1973 Nebraska reports record 605-606 PTO rpm at their 2,400-rpm rated-engine-speed runs, while the normal operating shaft and fitted equipment still need confirming on an individual tractor.

Hydraulics

The listed system is open center with 13 gpm pump flow. The model is also listed with a Category II rear hitch, position and draft control, and a 3,969 lb rear-lift figure. The operator preview visibly covers auxiliary valves, remotes, and three-point-hitch material, but it is not the complete manual.

Fluids, Battery, and Service Facts

The listed fuel capacity is 20 gal (75.7 L). The reviewed operator preview has contents for lubrication, cooling, air cleaning, electrical, preventive maintenance, and specifications; the full matching operator manual is still needed for the correct fluid grade, interval, and procedure.

Tires and Dimensions

Listed agricultural tire sizes are 7.50-16 front and 16.9-30 rear, with an 84.5-inch wheelbase and 5,650 lb operating weight. The Nebraska reports tested those tire sizes in particular ballast setups, so wheel, tire, and ballast choices should be checked on the tractor being compared.

Electrical

Published electrical information lists negative ground and a 12-volt battery. The operator preview covers the electrical system, and the chassis-service preview includes electrical sections, but either complete publication should be matched before making a repair decision.

Serial Number Lookup

The serial plate is listed on the left side of the transmission housing. Published year-start serials run from 100001 for 1973 to 107555 for 1977, making the serial a useful first step when selecting configuration-sensitive manuals and parts.

Manuals, Parts, and Nebraska Tests

The reviewed IH-O-674 file is an eight-page commercial operator-manual preview. It visibly includes the 674 cover, a detailed contents list for engine operation, hydraulics, PTO, cooling, electrical, wheels, lubrication, preventive maintenance, and specifications, plus an auxiliary-valve and remote-cylinder page. It is not the complete operator manual.

The TC-163 parts-catalog preview is a reviewed 14-page commercial extract with the 674 cover and a model-specific index. Its index separates engine-fuel entries, but it is not a complete serial-matched illustrated catalog. The reviewed chassis-service and D-239 engine-service previews are multi-model references with clearly stated scope, not a substitute for the full matched manuals.

The University of Nebraska archive preserves two official 1973 records. Test 1128 is the gasoline utility/row-crop 8-speed test: 58.53 PTO hp at rated engine speed and 51.97 maximum-available drawbar hp. Test 1129 is the diesel utility/row-crop 8-speed test: 61.56 PTO hp and 54.45 drawbar hp. Each result belongs to its tested fuel and configuration.

Parts Checks Before Ordering

• TC-163 674 parts-catalog previewReviewed model-specific index preview; use a complete serial-matched catalog for part-number and fitment decisions.Open parts-catalog preview
• 674 chassis-service previewReviewed multi-model chassis-only preview; use the complete matching publication for settings and procedures.Open chassis-service preview
• D-239 engine-service previewReviewed multi-model D-239 engine preview; it does not replace a complete model- and serial-matched service manual.Open D-239 engine-service preview