Advanced Severe-Duty Rear Rubber Suspension System

ULTIMAAX Advanced Severe-Duty Rear Rubber Suspension

In addition to its excellent durability, ULTIMAAX® delivers enhanced stability, handling and ride quality even in the most severe-duty environments where vehicles encounter harsh and unexpected ground conditions. The integration of Hendrickson's proven walking (equalizing) beam technology, with its patented progressive rate spring, provides a balance of loaded stability and unloaded ride quality even in the most rugged environments.

ULTIMAAX Advanced Severe-Duty Rear Rubber Suspension

Features and Benefits

  • Recommended for fire/rescue, dump, logging, refuse, mixer, oil field, military and mining applications
  • Optimized design to balance robust durability and weight savings
  • Progressive rate springs provide a unique balance of unloaded ride quality and loaded stability
  • Fabricated walking-beam design equalizes axle loading while providing optimal clearance, axle travel and weight
  • Capacities up to 70K lbs.


Suspension Rating (lbs.) 46,000 52,000 60,000 70,000
Suspension Weight1 1,179 lbs. 1,198 lbs. 1,407 lbs. 1,750 lbs.
GVW Approval3 Contact vehicle OEM2 Contact vehicle OEM2 Contact vehicle OEM2 Contact vehicle OEM2
GCV Approval Contact vehicle OEM2 Contact vehicle OEM2 Contact vehicle OEM2 Contact vehicle OEM2
Site Travel Rating4 (lbs.) 70,000 75,000 85,000 95,000
Diagonal Articulation5(in.) 17.5 17.5 17.5 17.5
Lift Axles Approved Approved Approved Approved
Ride Heights (in.) 9.5 to 13 9.5 to 13 9.5 to 13 12 in.+
Axle Spacing (in.)6 52, 54, 56, 60 52, 54, 56, 60 54, 56, 60 56, 60

Hendrickson approves the use of ULTIMAAX® in the following vocational truck applications: dump, concrete mixer, refuse, logging, crane / boom, platform and
fire / rescue. All such 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.
1. Installed weight includes full suspensions with torque rods and without shocks.
2. Suspension must be paired with appropriate axle rating.
3. Contact Hendrickson for applications that may exceed GVW approval ratings.
4. Site travel rating – operators using vehicles equipped with liftable pusher or tag axles must not exceed published ratings. Ratings are limited to no more than
five percent of vehicle operation at speed not to exceed five mph. Liftable pusher or tag axles should only be raised (or unloaded) to improve vehicle maneuverability
in off-road use or when vehicle is empty. Site travel ratings are consistent with published axle manufacturer’s limitations. Axle and suspension site travel
specifications must not be exceeded.
5. Suspension articulation may exceed vehicle’s capability and may be limited by vehicle manufacturer; vehicle manufacturer installed axle stops may restrict
suspension’s articulation.
6. Contact Hendrickson for availability of additional beam lengths.
For additional details regarding specifications, applications, capacities, operating service and maintenance instructions, refer to applicable Hendrickson
technical literature (available at www.hendrickson-intl.com) or contact Hendrickson at 630-910-2800.
Actual product performance may vary depending upon vehicle configuration, operation, service and other factors.
U.S. and foreign patents granted and / or pending.


File Name Rev. Date Size


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