International WorkStar

The International WorkStar is a line of severe duty trucks produced by Navistar, Inc.[1] The WorkStar is the successor to the 7400 and 7600 series trucks produced by International. Starting in 2008 the "thousand series" name was dropped in favor of the WorkStar. This change was reflected in the physical construction of the truck in the form of a new hood and grill along with increased MaxxForce Engine options.[2]

International WorkStar
Overview
TypeConventional cab
ManufacturerInternational Trucks
Production2008–2018
AssemblyGarland, Texas
Body and chassis
ClassClass 7–9
Severe Service
Powertrain
EngineVarious inline 6 diesel engines
Transmission
  • 6-speed automatic
  • 6-speed manual
  • 13-speed manual
  • 18-speed manual
Chronology
Predecessor7400 and 7600 Series
SuccessorHV Series

Models

The WorkStar is commonly custom-built, and has many different layouts. All models are available as 4x2,[lower-alpha 1] the 7300-7500 have all-wheel drive 4x4 models. The 7400-7600 are available with both 6x4 and 6x6 tandems, and the 7600 can have an unusual 8x6 layout, with a three driven axle "tridem". Most models can have either forward or set-back front axles.

Electrical systems have become very complex, both for engine control and monitoring the chassis. Controls for power take-offs (PTOs), body operations, snowplow and other types of auxiliary lighting can be factory installed.

Cabs are available in standard, extended, and crew types on all models. Made of galvanized steel, they can have heated windshield, mirrors, air-conditioning and many interior options.

Selected 2016 Models (not all are shown.)

ModelMax. front GAWR[lower-alpha 2]Max. rear GAWRMax. GVWR[lower-alpha 3]Engine[lower-alpha 4]Trans
7300 4x210,000 lb (4,500 kg)[lower-alpha 5]17,500 lb (7,900 kg)[lower-alpha 5]27,500 lb (12,500 kg)[lower-alpha 5]ISB6.76M, 6A
7400 6x420,000 lb (9,100 kg)46,000 lb (21,000 kg)60,000 lb (27,000 kg)N913M, A
7500 6x422,000 lb (10,000 kg)52,000 lb (24,000 kg)60,000 lb (27,000 kg)ISL9 N1018M, A
7600 8x622,000 lb (10,000 kg)69,000 lb (31,000 kg)76,000 lb (34,000 kg)N1318M, A

Powertrain

In 2014, the WorkStar is available with 4 diesel engines. The lowest rated is the MaxxForce DT, a 466 cu in (7.6 L) inline 6 with 215 hp (160 kW) at 2200 rpm. The highest rated is the N13, a 758 cu in (12.4 L) inline 6 with up to 475 hp (354 kW) at 1850 rpm.

Eaton/Fuller offers manual transmissions from 6 to 18 speeds, and a self-shifting manual. Allison offers three automatic transmissions.[3]

2016 Engines

Model[lower-alpha 6]DisplacementType[lower-alpha 7]Power[lower-alpha 8]Torque[lower-alpha 8]
Cum ISB6.7[4]408 cu in (6.7 L)Mid200 hp (150 kW)[lower-alpha 9]520 lb⋅ft (710 N⋅m)[lower-alpha 9]
Cum ISL9543 cu in (8.9 L)HD380 hp (280 kW)1,250 lb⋅ft (1,690 N⋅m)
Nav N9[5]570 cu in (9.3 L)Mid330 hp (250 kW)950 lb⋅ft (1,290 N⋅m)
Nav 10[6]570 cu in (9.3 L)HD370 hp (280 kW)1,250 lb⋅ft (1,690 N⋅m)
Nav 13[7]758 cu in (12.4 L)HD475 hp (354 kW)1,250 lb⋅ft (1,690 N⋅m)

WorkStar applications

Construction The primary use of the WorkStar is as a heavy 6x4 dump truck with a GVWR[lower-alpha 3] of approximately 50,000 lb (23,000 kg). With all the upgrades possible, it can be used as a concrete mixer, where the heavy duty front drive axle is often used. It can also be a semi-tractor, pulling dump or lowboy trailers.

Off-road fire engine

Fire equipment. In rural areas of the US, especially in state and national parks, fire equipment has to go to remote off-road areas, often carrying water with them. The WorkStar has options needed, high strength and power, heavy duty front drive axle, an advanced electrical system, and a crew-cab. An extreme truck can be ordered with factory parts.

Railroad maintenance truck

Railroad maintenance. Railroad equipment is very heavy, and the track needs maintenance its whole length, no matter how remote. The WorkStar's chassis can be ordered to mount road-rail pilot wheels, which let the truck run directly on the tracks. Racks can be mounted outside and above the cab so the truck can self-load and unload sections of rail onto them. The crew-cab is often used, and the truck also carries a large amount of tools and equipment.

Plow dump truck

Street and road maintenance In the northern US snow is a problem for roads, which need to be plowed and salted. Built with wiring and controls for lights and equipment, body options like heated windshields, mirrors, and seats, the truck comes ready for the service from the factory. The strong chassis with heavy-duty front wheel drive can plow around the clock for days.

Utility boom truck

Utilities The WorkStar is popular with utilities, who often work off-road for long periods in bad weather. The front driven axle is very useful when the truck is moved to many different sites. The strong frame adapts to outriggers and a long boom, so employees can work on overhead wires.

  • Fire tank truck
    Fire tank truck
  • Snowplow with spreader body
    Snowplow with spreader body
  • Sewer vacuum truck
    Sewer vacuum truck
  • Refuse collection truck
    Refuse collection truck
  • Railroad maintenance truck
    Railroad maintenance truck

Aftermarket

The consumer version of the WorkStar is manufactured by Midwest Automotive Designs, which is a manufacturer based in Elkhart in Indiana that produces conversions of class 5 and 6 commercial trucks conversions as luxury consumer vehicles. The company makes several pickup truck models of the WorkStar, including the International WorkStar Pickup, and WorkStar SUV.[8]

Notes
  1. Number of wheels × number of powered wheels, with dual tires counted as a single wheel.
  2. Gross Axle Weight Rating is the loaded weight of the axle.
  3. Gross Vehicle Weight Rating is the loaded weight of the truck.
  4. Highest rated engine.
  5. Lightest rating.
  6. Engines are Cummins (Cum) or Navistar (Nav)
  7. Mid-range (Mid) or Heavy-duty (HD)
  8. Highest rated model.
  9. Lowest rated model

References
  1. "International Trucks - Workstar".
  2. "International Showcases Truck and Engine Lineup at MATS". TruckingInfo.com. Retrieved 24 July 2012.
  3. "International Workstar". Navistar. 2014. Retrieved 20 July 2014.
  4. "Cummins 6.7 Turbodiesel (Specs, Info, & Resources)". CumminsHub.com. 2016. Retrieved 3 Sep 2016.
  5. "Navistar N9". Navistar. 2016. Retrieved 3 Sep 2016.
  6. "Navistar N10". Navistar. 2016. Retrieved 3 Sep 2016.
  7. "Navistar N13". Navistar. 2016. Retrieved 3 Sep 2016.
  8. "WorkStar - Consumer pickup truck and SUV". Midwest Automotive Designs.
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