Hendrickson — Primaax

Description

This is a heavy-duty air suspension for vocational, severe-service and heavy-haul applications. It is approved for use by the OE for crane, dump, heavy-haul, logging, mining, cement mixer, oil field, tanker trucks and waste haulers.

There are multiple versions of this suspension. The variations in design are usually found in the shape of the hangers, length/location of the shocks or unique air springs but the overall design idea is the same.

Fast Facts

Hendrickson — Primaax
Type	Heavy-duty air suspension for vocational, severe-service and heavy-haul applications.
Features	Approved for use by the OE for crane, dump, heavy-haul, logging, mining, cement mixer, oil field, tanker trucks and waste haulers.
Problem Areas
ATRO Solutions

Tech Tips and Additional Resources

ATRO offers a full complement of bushings and torque rod options for Hendrickson’s Primaax.

ATRO’s pivot bushing, PB50-26648, utilizes a low friction intermediate sleeve to ease rotation and improve resistance to wear.

Note: The OE's pivot bushing, 58648-000, is used in Primaax, MaxAir and Twisted Sister. Though ATRO offers a direct cross-reference with its PB50-26648, it is only for use in Hendrickson’s family of Primaax suspensions.

Wear Items

Frame hanger attachment area becomes oblong
- Usually caused by loose pivot bolt fasteners or overloading
- Check transverse torque rods for wear
Torque Rods
- Longitudinal rods – bushing walks out of rod

Check for improper alignment or worn bushings.

Transverse torque rods
- Check for incorrect axle alignment, incorrect pinion angle, incorrect frame hole location or if axle bracket weld is off
- Worn bushings