PRIMAAX® EX for Bus/RV or Medium-Duty

Single drive-axle, heavy-duty air suspension system

PRIMAAX EX for Bus, RV and Medium-duty Applications

The PRIMAAX® EX heavy-duty rear air suspension provides a package of benefits tailored for bus, RV and medium-duty applications. The system features a robust structural design with optimized suspension geometry for exceptional stability, handling and ride. Suspension windup and corresponding frame rise are significantly reduced with PRIMAAX EX compared to competitive trailing-arm air suspensions, for enhanced driver and passenger comfort.

PRIMAAX EX for Bus, RV and Medium-duty Applications

Features and Benefits

  • Advanced structural beams utilize premium materials for high durability and reliability
  • Optimized suspension geometry contributes to more than twice the roll stability of competitive air suspensions, helps improve handling and roll stiffness for expanded applications and significantly controls suspension-induced driveline vibration
  • Structural beams include integrated end caps that form a solid connection with the square cross brace to form a rigid torsion system for improved stability and control
  • Superior mobility with up to 12.5 inches of diagonal wheel travel and 8 inches of vertical axle travel
  • Large-volume air springs lift and support the load with less air pressure, while providing superb ride quality
  • Premium, heavy-duty bushings require no lubrication for reduced maintenance
  • QUIK-ALIGN® system helps simplify axle alignment for reduced maintenance time and extended tire life

Specifications

Model PRIMAAX EX  
Capacity (lbs) 23,000 23,500
Installed Weight1 (lbs) 542 651
Axle Configuration Single Single
GCW Approval2 (lbs) Contact vehicle OEM2 Contact vehicle OEM2
Axle Travel4 (in) 8 8
Ground Clearance (in) 10.75 10.5
Lift Axles Approved Approved
Ride Heights5 (in) 8.5 to 10.5
12.5 to 15.5
8.5 to 10.5
12.5 to 15.5
Engine Torque Restrictions None None
Axle Spacing (in) N/A N/A
  • PRIMAAX® EX is approved for heavy-duty bus applications. All applications must comply with applicable Hendrickson specifications and must also be approved by the respective vehicle manufacturer with the vehicle in its original, as-built configuration. Contact Hendrickson and the respective vehicle manufacturer for approval of additional applications.
  • For additional details regarding specifications, applications, capacities, and operating, service and maintenance instructions, refer to applicable Hendrickson technical literature or contact Hendrickson at 630-910-2800.

1. Installed weight includes complete suspension, torque rods, axle and frame brackets and all hardware. Published weight is for standard PRIMAAX EX suspension using 10.0-inch ride height. Other configurations may change weight.

2. Suspension must be paired with appropriate axle rating.

3. Site Travel Rating — Operators using vehicles equipped with liftable push or tag axles must not exceed published ratings. Ratings are limited to no more than five percent of vehicle operation at a speed not to exceed five mph. Liftable pusher or tag axles should be raised (or unloaded) to improve vehicle maneuverability in off-road use or when vehicle is empty. Site travel ratings are consistent with specifications and must not be exceeded.

4. Axle travel may be limited by vehicle manufacturer; axle stop settings and shock stroke may restrict suspension's articulation. Varying ride heights and configurations may restrict travel.

5. For different ride height options, please contact Hendrickson, your truck manufacturer or dealer for further information.

6. Refer to axle manufacturer's recommendation.

Literature

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