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International WorkStar
International WorkStar
International WorkStar
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International WorkStar
2012 International WorkStar
Overview
TypeConventional cab
ManufacturerInternational Trucks
Production2008–2018
2013-2017 (New Zealand)
AssemblyGarland, Texas
Tauranga, New Zealand
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

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]

For the New Zealand market the WorkStar was assembled locally as a right hand drive product from 2013 through to 2017. There were two variants, the WorkStar 7400 with the 'visibility hood', and the WorkStar 7600 with a MaxxForce 13L engine.[3]

Models

[edit]

The WorkStar is commonly custom-built, and has many different layouts. All models are available as 4x2,[a] 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.)

Model Max. front GAWR[b] Max. rear GAWR Max. GVWR[c] Engine[d] Trans
7300 4x2 10,000 lb (4,500 kg)[e] 17,500 lb (7,900 kg)[e] 27,500 lb (12,500 kg)[e] ISB6.7 6M, 6A
7400 6x4 20,000 lb (9,100 kg) 46,000 lb (21,000 kg) 60,000 lb (27,000 kg) N9 13M, A
7500 6x4 22,000 lb (10,000 kg) 52,000 lb (24,000 kg) 60,000 lb (27,000 kg) ISL9 N10 18M, A
7600 8x6 22,000 lb (10,000 kg) 69,000 lb (31,000 kg) 76,000 lb (34,000 kg) N13 18M, A

Powertrain

[edit]

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.[4]

2016 Engines

Model[f] Displacement Type[g] Power[h] Torque[h]
Cum ISB6.7[5] 408 cu in (6.7 L) Mid 200 hp (150 kW)[i] 520 lb⋅ft (710 N⋅m)[i]
Cum ISL9 543 cu in (8.9 L) HD 380 hp (280 kW) 1,250 lb⋅ft (1,690 N⋅m)
Nav N9[6] 570 cu in (9.3 L) Mid 330 hp (250 kW) 950 lb⋅ft (1,290 N⋅m)
Nav 10[7] 570 cu in (9.3 L) HD 370 hp (280 kW) 1,250 lb⋅ft (1,690 N⋅m)
Nav 13[8] 758 cu in (12.4 L) HD 475 hp (354 kW) 1,250 lb⋅ft (1,690 N⋅m)

WorkStar applications

[edit]

Construction The primary use of the WorkStar is as a heavy 6x4 dump truck with a GVWR[c] 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 Doppler on Wheels (DOW) Truck
    Railroad maintenance truck
    Doppler on Wheels (DOW) Truck

Aftermarket

[edit]

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.[9]

Notes

[edit]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

International WorkStar

View on Grokipedia
from Grokipedia
The International WorkStar is a line of severe-duty vocational trucks manufactured by Navistar International Corporation, introduced in 2007 as a successor to the 7400 and 7600 series for applications including , refuse collection, services, and mixing. Designed with flexibility in mind, it offered configurations such as 4x2, 4x4, 6x4, and 6x6 drivetrains, along with set-forward or set-back options, day, extended, or crew cab styles, and gross weights ranging from 27,500 to 66,000 pounds. Key features included a high-strength frame made from 80,000 or 120,000 PSI steel, wide-track s for up to 50-degree wheel cut maneuverability, and an air-ride cab with enhanced visibility from a one-piece wrap-around and optional sloped hood. Powertrain options encompassed diesel engines like the Cummins B6.7 (up to 325 hp, 750 lb-ft torque), Navistar N9 (up to 330 hp, 950 lb-ft), Navistar N10 (up to 370 hp, 1,250 lb-ft), and L9 (up to 380 hp, 1,250 lb-ft), paired with manual, automated, or automatic transmissions from Eaton or Allison. Production of the WorkStar continued through 2017, when it was replaced by the HV Series to address evolving vocational needs and driver preferences.

History and Development

Origins and Introduction

The International WorkStar originated as a successor to the 7400 and 7600 series trucks, building on the foundations of the 7000 series, which was introduced in late 2001 as part of International Truck and Engine Corporation's lineup of high-performance vocational vehicles. These earlier models emphasized severe-duty capabilities for demanding work environments, setting the stage for the WorkStar's evolution toward greater customization and durability in heavy-duty applications. The WorkStar was officially introduced for the 2008 model year, marking a significant branding shift when International replaced the numeric "thousand series" —such as the 7000, 8000, and 9000 lines—with descriptive names to better highlight each model's vocational purpose and rugged performance. This rebranding, announced in early , aimed to streamline marketing and underscore the WorkStar's role as a dedicated severe-duty platform, distinct from lighter-duty siblings like the DuraStar. From its debut, the WorkStar targeted the North American market for Class 7 and 8 trucks, with gross vehicle weight ratings ranging from 27,500 to 73,000 pounds, positioning it for , service, and heavy-haul operations where reliability under extreme conditions is essential. Central to the WorkStar's design philosophy was a highly customizable system, featuring multiple frame-rail options and a Huck-bolted frame for enhanced vocational upfitting and superior ruggedness in off-road and high-stress scenarios. Complementing this durability, the cab incorporated ergonomic enhancements, including a spacious interior, quiet operation, and smooth ride characteristics to prioritize operator comfort during long shifts in challenging environments.

Production and Assembly

The International WorkStar was primarily assembled at Navistar International Corporation's manufacturing facility in , beginning with its market introduction as a 2008 model year truck in late 2007 and continuing until the plant's closure in early 2013. The Garland operation focused on severe-duty trucks, including the WorkStar alongside models like the PayStar and TranStar. After the Garland facility shut down, WorkStar production shifted to Navistar's Springfield, Ohio assembly plant, where it became one of the primary medium- and heavy-duty models manufactured until the line's discontinuation in 2018. The Springfield site handled vocational configurations of the WorkStar, supporting Navistar's expanded output for North American markets during this period. For international markets requiring right-hand-drive configurations, Intertruck Distributors (NZ) Ltd. performed local assembly of the WorkStar at its , plant from 2013 to 2017, starting with variants like the 7600 series in 6x4 and 8x4 setups tailored to regional needs. A notable production milestone occurred in 2016, when the WorkStar lineup was updated to include the ISL9 engine option, enabling compliance with 2017 EPA emissions standards while maintaining vocational performance. These changes involved recalibrations and component integrations at the Springfield facility to meet regulatory requirements without major disruptions to output.

Design and Models

Chassis and Configurations

The International WorkStar features a conventional cab design available in set-forward or set-back axle configurations, with bumper-to-back-of-cab (BBC) lengths of 107 inches for set-forward setups and 141 inches for set-back options, allowing for tailored wheelbase and body mounting flexibility. These configurations support up to a 50-degree wheel cut for enhanced maneuverability in tight spaces, particularly suited for vocational applications. The cab utilizes double-sided galvanized steel construction, tested to meet SAE J2422 rollover standards and ECE R29 crash regulations, ensuring structural integrity under severe service conditions. The employs high-tensile frame rails, available in single or double 10-inch configurations, secured with a Huck-bolted system for superior durability and resistance to twisting forces. This frame design accommodates gross vehicle weight ratings (GVWR) ranging from 27,500 to 73,000 pounds across the model lineup, providing scalability for diverse load requirements. Crossmembers and mounting points are engineered for easy integration of above-frame-rail cooling systems and front-mounted (PTO) equipment, optimizing clearance and maintenance access. Drivetrain configurations include 4x2 for standard on-road duty, 4x4 and 6x4 for mixed on/off-road operations, and heavier 6x6 or 8x6 setups for extreme and payload demands, with axle ratings from Meritor or Dana Spicer components supporting front capacities up to 22,000 pounds and rear or tridem options up to 69,000 pounds combined. The cab incorporates a tilt-forward hood in three-piece design, which facilitates access and reduces repair costs by allowing individual panel replacement. Interior feature an adjustable center panel, tilt-and-telescoping , and optional air-ride seats with integrated HVAC systems for operator comfort during extended shifts.

Model Variants

The International WorkStar series encompasses several model variants tailored to different vocational demands, ranging from mid-range to heavy-duty applications. The 7300 model serves as the entry-level option in the lineup, classified as a Class 7–8 truck with available 4x2 and 4x4 configurations and a GVWR of 27,500 to 60,000 pounds, making it suitable for lighter to medium vocational tasks such as urban delivery and . The 7400 model bridges mid- and heavy-duty needs, operating in Class 7–8 with 4x2, 4x4, and 6x4 configurations and a GVWR of 27,500 to 60,000 pounds, ideal for balanced and operations where versatility in load capacity is required. In contrast, the 7500 is a dedicated Class 8 model featuring 6x4 and 6x6 configurations with a GVWR of 27,500 to 60,000 pounds, designed for heavy-duty off-road tasks in sectors like and heavy . At the top of the range, the 7600 model targets Class 8 severe-haul applications with 6x4, 6x6, and 8x6 configurations and a GVWR of 35,000 to 73,000 pounds, providing for demanding and environments. Across the lineup, the design maintained core structural distinctions between models through its production run.
ModelClassAxle ConfigurationsGVWR (lb)Primary Uses
73007–84x2, 4x427,500–60,000Lighter to medium vocational tasks (e.g., delivery, municipal)
74007–84x2, 4x4, 6x427,500–60,000, utility
750086x4, 6x627,500–60,000Heavy-duty off-road (e.g., waste, )
760086x4, 6x6, 8x635,000–73,000Severe-haul applications (e.g., heavy utility)

Powertrain

Engines

The International WorkStar, introduced in 2007, featured Navistar's MaxxForce DT as a primary option for the 2008 , a 7.6-liter inline-six designed for medium- and heavy-duty applications. This delivered power outputs ranging from 210 to 300 horsepower and from 520 to 860 pound-feet, providing reliable performance for vocational trucks in classes 6 through 8. The 2008 also included the MaxxForce 9 and MaxxForce 10 , both 9.3-liter inline-sixes, with the MaxxForce 9 offering 300 to 330 horsepower and 800 to 950 pound-feet, and the MaxxForce 10 providing 310 to 350 horsepower and 1,050 to 1,150 pound-feet, enhancing capability for heavier payloads. Starting in 2015, International introduced the ISB 6.7-liter inline-six as an alternative, available in ratings from 200 to 325 horsepower and up to 750 pound-feet of torque (with higher ratings for fire and emergency applications), broadening options for operators seeking proven Cummins reliability. By 2014, the MaxxForce 9 and 10 received (SCR) updates to meet evolving emissions requirements, while the ISB incorporated (EGR), (DPF), and SCR systems for compliance. In the later production years from 2016 to 2017, Navistar transitioned to its N-series engines (EPA 2017 updates to the MaxxForce lineup), including the N9 (9.3 liters) and N10 (9.3 liters) at 260 to 370 horsepower and 860 to 1,250 pound-feet, alongside the heavier-duty N13 (12.4 liters) offering 370 to 475 horsepower and up to 1,550 pound-feet of torque for demanding severe-service roles. The L9 (8.9 liters), succeeding the ISL9, became available with ratings up to 380 horsepower and 1,250 pound-feet, prioritizing emissions compliance through integrated aftertreatment. These N-series engines, like their predecessors, paired with transmissions such as the Allison 3000 series for optimized power delivery. All WorkStar engines from 2010 onward utilized high-pressure common-rail systems, combined with EGR and DPF technologies to adhere to EPA 2010 and subsequent standards, reducing and particulate emissions without initial reliance on SCR in early MaxxForce variants.

Transmissions and Drivetrain

The International WorkStar offered a range of transmission options designed for vocational applications, including Eaton Fuller manual transmissions in 5- to 18-speed configurations, Eaton UltraShift automated manuals in 6- to 18-speed variants, and Allison automatic transmissions from the 2000 to 4500 series (including HS, EVS, and RDS models). Overdrive options were available in select Eaton and Allison units to optimize highway efficiency and delivery for heavy loads. Front axles utilized Meritor or Dana Spicer models rated from 10,000 to 22,000 pounds, with front-drive variants from Meritor (10,000–18,000 pounds) or Fabco (10,000–14,600 pounds) for 4x4 and 6x6 setups. Rear axles included single configurations from Meritor (17,000–38,000 pounds) or Dana Spicer (17,500–30,000 pounds), while tandem rear axles ranged from 34,000 to 52,000 pounds via Meritor or Dana Spicer, with tridem options up to 69,000 pounds for 8x6 models. Driveline features emphasized durability in off-road and heavy-duty conditions, with full-locking differentials available as driver-controlled options on front, forward , and rear axles, engageable below 25 mph for traction in or . setups included power divider locks (PDL) to distribute evenly, and controlled traction differentials using friction plates for enhanced grip without full locking. For 4x4 and 6x6 models, two-speed transfer cases from Dana Spicer (model 792), Meritor (T-4208), or Fabco (TC-38) provided high/low range shifting below 10 mph, enabling multiplication for off-road operations. Gearing ratios in the were selected based on outputs to ensure optimal multiplication for vocational loads, with two-speed and options allowing adaptation to varying terrains and payloads.

Applications and Uses

Vocational Applications

The International WorkStar series is widely utilized in vocational applications due to its robust designs, which support extensive upfitting for demanding commercial tasks in , utilities, and . Its set-forward and set-back configurations, combined with GVWR options ranging from 27,500 to 73,000 pounds, enable seamless integration of specialized bodies while maintaining maneuverability on job sites. This flexibility has made the WorkStar a staple in the U.S. market for operators seeking durable, customizable trucks that minimize through factory-supported upfit processes. In , the WorkStar excels as a rear or transfer , commonly configured in 6x4 setups for hauling aggregates on sites. Models like the 7500 series handle heavy loads with features such as hydraulic system monitoring and rear gate unlock switches, supporting typical capacities of 10 to 18 cubic yards depending on body specifications. These configurations provide reliable performance for , , and , with programmable controls for safe operation. For concrete delivery, the WorkStar serves as a mixer truck, particularly in urban building projects where tight navigation is essential. Equipped with programmable (PTO) systems and remote switches for chute and water valve controls, it accommodates drums with capacities around 10 to 12 cubic yards, as seen in 11-cubic-yard examples on 7600 models. This setup ensures efficient mixing and discharge while protecting components during high-torque operations. Utility and service body applications leverage the WorkStar's spacious cabs and integrated electrical systems for telecom, electrical, and refuse collection work. Boom variants feature audible stowage alarms and remote power modules for tool integration, while refuse models incorporate body-mounted controls for compact handling in urban environments. These upfits benefit from the 's high-durability frame, which supports overhead equipment without compromising stability. Road maintenance fleets employ the WorkStar for plows, spreaders, and graders, often in municipal configurations with 4x4 options for winter operations. It includes dedicated plow lighting, high-amperage switches for light bars, and pre-trip inspection features to ensure compliance and safety during or material spreading. The platform's versatility has contributed to its adoption in U.S. , where upfit flexibility allows tailored solutions for de-icing and grading tasks.

Specialized and Military Variants

The International WorkStar has been adapted for and response applications, particularly as pumper and tanker configurations suited to demanding environments. These variants often feature 4x4 drivetrains to enhance mobility in rural or off-road settings, where quick access to remote scenes is essential. For instance, the WorkStar 7400 model has been utilized as a Type III pumper, equipped with water pumps and tanks for wildland operations. Similarly, brush trucks and commercial pumpers based on the 7400 and 7500 series provide robust platforms for urban-rural interface responses, with reinforced suspensions to carry equipment over uneven . In railroad maintenance, the WorkStar incorporates hi-rail gear, enabling seamless transitions between road and rail travel for track inspection and repair tasks. These adaptations include hydraulic rail wheels and steering systems integrated into the , allowing crews to access remote rail sections efficiently. The 7400 and 7500 models, often configured with axles, support heavy tooling for vegetation control, signaling repairs, and upkeep, with some variants featuring 6x4 drivetrains for enhanced traction on uneven . Such hi-rail WorkStars have been deployed by maintenance-of-way teams, demonstrating durability in prolonged field operations along extensive rail networks. Military variants of the WorkStar form the basis of the , a line of heavy-lift tactical vehicles designed for and troop transport in zones. The 7000-MV (Medium Tactical ) configuration, produced primarily in the 2000s and 2010s, offers high-mobility features such as automatic traction control and the ability to climb 60% gradients or navigate 40% side slopes, making it suitable for rugged terrains encountered by the and allied forces. These trucks have been supplied to the for foreign , including over 2,900 units to the Afghan National and Iraqi Ministry of Defense in 2007, as well as additional 7000-MV deliveries to under a $18.8 million contract in 2017. The platform supports cargo, personnel, and equipment hauling, with variants emphasizing commonality for maintenance efficiency in theater operations. Specialized industrial adaptations include oilfield service rigs mounted on the WorkStar , leveraging its robust frame for well-drilling, pumping, and remote power generation in harsh environments. The huck-bolted frame and system provide reinforcement to withstand the vibrations and loads of oilfield operations, with models like the 7300 and 7400 serving as field service pumpers. Export variants of the WorkStar were produced in right-hand-drive configuration to meet regional requirements in markets like and . Local assembly in New Zealand from 2013 to 2017 included full RHD conversions of the 7600 model, while the 7400 model was imported in RHD configuration featuring a visibility hood for improved driver on left-hand roads. These adaptations facilitated sales and operations in Australasian vocational sectors, with units available through regional distributors.

Aftermarket and Legacy

Custom Modifications

The International WorkStar, with its robust cab-forward design, lends itself to various aftermarket modifications aimed at enhancing performance and versatility for non-commercial uses. Owners and tuners have explored upgrades to the , particularly for the MaxxForce 13 (N13) , where aftermarket turbochargers and related components allow for increased horsepower. For instance, high-pressure turbo replacements compatible with the N13 can be paired with complementary tuning, as offered by specialized diesel parts suppliers. Performance enhancements extend to fuel systems and exhaust modifications, enabling enthusiasts to optimize the truck's capabilities for or high-speed applications beyond its original vocational intent. Suppliers like 4 State Trucks provide drop-in turbochargers, quiet mufflers, and FASS systems specifically for WorkStar models, facilitating straightforward installations that boost efficiency and power without major alterations. Off-road modifications are another area of interest for 4x4 WorkStar variants, particularly the 7300 and 7400 series, which feature single front (SFA) setups suitable for rugged . Enthusiasts often add larger all-terrain tires to improve traction and ground clearance. While lift kits and winches are less commonly documented for WorkStars compared to lighter pickups, the truck's inherent durability supports such builds in enthusiast circles focused on extreme . Supporting these custom projects, parts availability remains robust post-2018 discontinuation, with Navistar's official network and third-party vendors ensuring access to OEM and aftermarket components for maintenance and upgrades. International dealers stock essentials like engine parts and suspension hardware, while sites such as Beltway Truck Parts offer comprehensive inventories for WorkStar models, minimizing downtime for modified vehicles.

Discontinuation and Successors

Production of the International WorkStar in the United States ceased in 2018 as part of Navistar's transition to newer truck platforms designed to comply with evolving EPA emissions regulations. Several factors contributed to this discontinuation, including declining sales following 2016 amid a broader slowdown in the heavy-duty truck market, intensified competition from established rivals such as Freightliner and , and Navistar's strategic rebranding of its heavy-duty lineup to the HV and LT series for improved market positioning. The International HV Series, introduced in 2018, directly succeeded the WorkStar as Navistar's flagship severe-duty vocational truck, maintaining its focus on rugged applications while incorporating significant upgrades. Key enhancements included the integration of the A26 12.4L engine, which offered up to 10% better fuel efficiency compared to prior powertrains through optimized design and emissions controls. This shift allowed the HV Series to address regulatory demands more effectively while preserving the WorkStar's vocational versatility for construction, refuse, and utility fleets. The WorkStar's legacy endures in the design of contemporary vocational trucks, influencing features like modular chassis configurations and driver-focused cabs in models such as the HV Series. Used WorkStar units remain available in the , valued for their durability.

References

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  48. https://beltwaytruckparts.com/product-vendors/navistar-internaional-truck-parts/
  49. https://www.overdriveonline.com/business/article/14890917/slumping-truck-sales-push-navistar-international-to-34m-quarterly-loss
  50. https://www.ccjdigital.com/business/article/14935879/navistar-in-process-of-rebranding-heavy-duty-truck-lineup
  51. https://news.international.com/2018-01-23-International-Truck-Unveils-Mid-Range-Diesel-Versions-Of-International-R-HV-TM-Series-Trucks
  52. https://www.truckinginfo.com/10154327/international-a26-engine-updates-further-improve-efficiency-performance
  53. https://www.truckinginfo.com/10229044/international-targets-vocational-market-with-revamped-hv
  54. https://www.truckpaper.com/listings/international-heavy-duty-trucks-and-trailers-for-sale/?Class=11&Manufacturer=INTERNATIONAL
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