🔩 Hendrickson PRIMAAX EX Rear Suspension
Hendrickson's PRIMAAX EX is a rubber-block walking-beam rear suspension designed for the North American long-haul market. Available on Peterbilt, Kenworth, Mack, and Freightliner as an alternative to the Hendrickson HAS or RT suspension, the PRIMAAX EX uses progressive rubber-block springs rather than steel leaf springs — providing a measurably smoother ride while reducing maintenance intervals. Fleets choose the PRIMAAX EX for driver retention, since ride quality is a significant factor in Class 8 truck driver satisfaction.
Suspension
Spécifications techniques
| Type | Rubber-Block Walking-Beam Tandem Rear Suspension |
|---|---|
| Capacity | 46,000 lb (20,865 kg) GVWR (standard) |
| Spring Medium | Progressive rubber blocks (no steel springs) |
| Beam Type | Fabricated steel beams |
| Axle Spread | 52 in (1,321 mm) standard |
| Maintenance Interval | 500,000 km (no greasing) |
| Manufacturer | Hendrickson International, Itasca IL, USA |
| Msrp | $4,200–$6,800 |