International Loadstar

The International Loadstar is a series of trucks that were produced by International Harvester from 1962 to 1978.[1] The first product line of the company developed specifically as a medium-duty truck, the Loadstar was slotted between C-Line pickup trucks and the heavy-duty R-series. Following the discontinuation of the R-series, the Loadstar was slotted below the Fleetstar and Transtar conventionals.

International Loadstar
Overview
ManufacturerInternational Harvester (1962-1978)
Production1962-1978
Body and chassis
ClassClass 6-7
Body styleTruck (bonneted cab)
Layout4x2, 4x4, 6X4, 6X6
Powertrain
EngineGasoline
*154–210 hp (115–157 kW)
Diesel
*113–200 hp (84–149 kW)
Transmission4, 5, 7, 8, and 10-speed manual
4 and 6-speed automatic
Chronology
PredecessorInternational Harvester R-Series
SuccessorInternational Harvester S-Series

Produced primarily as a straight truck, the Loadstar was developed primarily for applications such as local delivery, construction, and agriculture. Along with fire truck applications, the Loadstar was offered as a "Schoolmaster" cowled school bus chassis.

In 1978, International introduced the medium-duty S-Series, consolidating the Loadstar and Fleetstar into a single model family.[2]

Production and models
1972-1978 Loadstar with tilting hood

International manufactured a complete line of trucks and used few light and medium-duty vendor parts. A conservative company, components had long production runs without model year changes. The Loadstar itself changed very little over its fourteen year production run. Early models were recognizable by their grey grill and "butterfly" hood, but a one-piece tilting hood was used from model year 1972 onwards.[3]

Loadstar

Most Loadstars had a medium-duty 4x2 chassis, but 4x4, 4X6, and 6x6 models were also built. A four-door crew cab was also available. The cab, also used on the Fleetstar, had been introduced on the A-series in 1957.

Models included: 1600, 1700, 1750, 1800, F1800, 1850, and F1850, with the numbers indicating the size and weight rating of the model. The 1750 and 1850 had mid-range diesels. The 1600 and 1700 were available with 4x4, the F1800 and F1850 had tandem rear axles.

Loadstar CO
1970 International Loadstar CO 1700

The Loadstar CO 1600, 1700, and 1800 were forward control cab-over-engine versions of the Loadstar, built from 1963 until 1970. They were available with loaded weights from 19,500 to 27,500 pounds (8,800 to 12,500 kg). For 1971, the Loadstar CO became the Cargostar, with a wider cab and larger grille; the model line would be produced through 1986.

Schoolmaster
1970s International Loadstar 1603 "Schoolmaster" with school bus body

The Schoolmaster 1603, 1703, 1803, and 1853 were cowl-chassis models used for school-bus type bodies, the 1853 was also available as a forward control bare chassis for flat-nosed bodies. The Schoolmaster had longer wheelbases available than the Loadstar, otherwise they were mechanically the same.

Design overview
1962-1971 Loadstar hood badging

Chassis

Models other than semi-tractors had vacuum assisted hydraulic drum brakes standard. Air over hydraulic and full air brakes were available. A driven front axle and tandem rear axles were available on some models (cab-over-engine models could have neither). Loaded weights were from 18,200 to 30,200 pounds (8,300 to 13,700 kg) and up to 50,000 pounds (23,000 kg) including trailers.[4]

Engines

Gasoline, CNG, and mid-range diesel engines were used. The short hood of the Loadstar meant that V-8 engines fit better than inline-six engines.

The V304/345/392 family was the primary engine of the Loadstar between 1962 and 1973. They are 304, 345, and 392 cubic inches (5.0, 5.7, and 6.4 l) overhead valve gasoline V8s. They developed 193, 197, and 236 horsepower (144, 147, and 176 kW) respectively. CNG V345s were also available. In 1962 the V304 was standard on the 1600 and 1700 while the V345 was standard on the 1800. On most models the next larger engine was optional. In 1974 the V345 became standard on the 1600.

The MV404 was introduced in 1974. It was a 404 cubic inches (6.6 l) overhead valve gasoline V8 with a 4-barrel carburetor. It developed 210 horsepower (160 kW) and 366 pound force-feet (496 N⋅m) of torque. It became standard on the 1700 and 1800.

The BD264/282/308 family were the only inline-six cylinder gasoline engines offered. They were 264, 282, and 308 cubic inches (4.3, 4.6, and 5.0 l) and developed 154, 136, and 202 horsepower (115, 101, and 151 kW) respectively.

Mid-range diesels were International V8s up to 200 horsepower (150 kW), the Detroit Diesel 6V53 with 195 horsepower (145 kW), and Perkins inline-sixes up to 130 horsepower (97 kW).

Model[5]Max. front GAWR[lower-alpha 1]Max. rear GAWRMax. GVWR[lower-alpha 2]Engine[lower-alpha 3]Trans
16007,500 lb (3,400 kg)17,000 lb (7,700 kg)24,500 lb (11,100 kg)V-3455 spd.[lower-alpha 4]
1600 4x46,000 lb (2,700 kg)14,200 lb (6,400 kg)35,000 lb (16,000 kg)V-3455 spd.
17009,000 lb (4,100 kg)18,500 lb (8,400 kg)27,500 lb (12,500 kg)MV-4044 spd.
1700 4x49,000 lb (4,100 kg)17,000 lb (7,700 kg)26,000 lb (12,000 kg)V-3455 spd.
18009,000 lb (4,100 kg)21,200 lb (9,600 kg)30,200 lb (13,700 kg)MV-44610 spd.
18509,000 lb (4,100 kg)21,200 lb (9,600 kg)30,200 lb (13,700 kg)D-1705 spd.
F1800 6x410,860 lb (4,930 kg)34,000 lb (15,000 kg)44,600 lb (20,200 kg)MV-4045 spd.
F1850 6x412,000 lb (5,400 kg)34,000 lb (15,000 kg)46,000 lb (21,000 kg)D-1705 spd.
  1. Gross Axle Weight Rating is the loaded weight of the axle.
  2. Gross Vehicle Weight Rating is the loaded weight of the truck.
  3. Highest rated engine for model.
  4. A 4 spd. automatic was available.

Driveline

Four and 5-speed manual transmissions were used. All gasoline single axle models could have a 2-speed rear axle. Diesel models were available with 8- and 10-speed Roadranger manual transmissions. Four and 6-speed automatic transmissions were available on some models.

The Loadstar name was revived in 2012 for a series of heavy duty low-slung cabover trucks, particularly suitable for waste hauling.[6] The Loadstar offered a stainless steel cab, an industry first, making it resistant to the corrosion associated with waste disposal, airplane refueling, and other such fields for which the truck was intended.[7]

Production was scheduled to begin in 2013 but never did.

References
  1. Wren, James A.; Wren, Genevieve (1979). Motor Trucks of America. Ann Arbor MI: The University of Michigan Press. pp. 247, 320. ISBN 0-472-06313-8.
  2. Crismon, p. 492
  3. Take another look- it's also a Loadstar (Brochure). International Harvester. 1972. New optional tilt hood and a new grille combine to make the Loadstar look wider, more powerful, and way ahead in styling [...].
  4. Motor's Truck and Diesel Repair Manual (26 ed.). Motor. 1973. pp. 946–948. ISBN 0-910992-16-9.
  5. "International Truck Specifications - Loadstar Line". Wisconsin Historical Society. 2013. Retrieved 2014-10-28.
  6. "Introducing the New International Loadstar". Navistar, Inc. 2012. Archived from the original on 2012-10-11.
  7. Navistar International Corporation (2012-03-21). "Navistar Introduces International Loadstar Work-Truck" (Press Release). PR Newswire. Archived from the original on 2016-03-04.
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