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Hendrickson Manufacturing - Woodridge, IL

Original Press Release

PRIMAAX® Air-Ride Rear Suspension Offered on International Vocational Trucks

Press release date: Sep 14, 2007

WOODRIDGE, Ill. Hendrickson Truck Systems Group officials announce availability of PRIMAAX heavy-duty air-ride rear suspension on International trucks.

Launched in 2003, PRIMAAX quickly earned the trust of vocational truckers in a variety of applications from dump trucks to heavy-haul tractors from truck-mounted cranes to logging trucks. International offers PRIMAAX 46,000-pound capacity (PAX 460) and PRIMAAX 23,000-pound capacity (PAX 230) suspensions on all PayStar and WorkStar series trucks With a significant number of trucks built today with specialized equipment susceptible to damage from prolonged exposure to vibration and road inputs, the smooth air-ride of PRIMAAX proves especially beneficial.

Heavy-duty forged support beams, premium outboard mounted torque rods and a highly engineered cross brace combine to deliver greater rollstiffness as compared to other rear air-ride suspensions.

PRIMAAX features large volume air springs and premium, heavy-duty shock absorbers for outstanding handling characteristics that can provide the driver with greater control during lane changes, highway ramp operation and tight road maneuvers.

Delivering up to 12 inches of diagonal articulation and eight inches ofaxle travel, PRIMAAX helps improve traction and provide greater off-road mobility, while up to 10.75 inches of ground clearance enhances maneuverability over rough terrain.

PRIMAAX provides numerous maintenance saving features such as premium rubber bushings, which eliminate lubrication requirements.

Hendrickson's unique QUIK-ALIGN system simplifies axle alignment without welding or drop-in shims. Hendrickson premium torque rods feature bonded rubber bushings for longer service life, and the outboard mounted longitudinal rods improve serviceability.

Operators who leave the comfort of the paved road appreciate the performance characteristics of PRIMAAX. In the past, truck owners sacrificed ride and handling to obtain stability and off-road maneuverability. PRIMAAX provides operators with the best of two worlds, delivering a smooth ride on the highway while traveling to job sites and the confidence of outstanding handling and stability when they leave the paved road.

For additional information on PRIMAAX, visit or contact Hendrickson Truck Systems Group at 630-910-2800.

A wholly owned subsidiary of Navistar International Corporation (Other OTC:NAVZ), International Truck and Engine Corporation is a leading producer of medium trucks, heavy trucks, severe service vehicles,mid-range diesel engines, parts and service. International and its affiliates sell their products, parts and services through a network of nearly 1,000 dealer outlets in the United States, Canada, Brazil and Mexico and from more than 60 dealers in 90 countries throughout the world. Additional information is available at

Hendrickson, a Boler company, is a premier global manufacturer and supplier of truck and tractor suspensions; trailer suspensions, controls and loose axles; truck and trailer lift axles; bumpers and trim components, and truck, tractor and trailer springs to the commercial transportation industry. Hendrickson, based in Itasca, Ill., continues to meet the needs of the transportation industry after more than 90 years. Visit the Hendrickson Web site at