Hendrickson — Primaax


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

 Key Parts

ATRO Pivot Bushing PB50-26648
Pivot Bushing

PB50-26648

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ATRO D-Pin Bushing SU50-29383
D-Pin Bushing

SU50-29383

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ATRO Torque Rod Bushing TH50-22692
Torque Rod Bushing

TH50-22692

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ATRO Torque Rod Bushing TS38000
Torque Rod Bushing

TS38000

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ATRO Torque Rod Bushing 3/4
Torque Rod Bushing 3/4" Bolt Hole

TS50-22210 3/4" Bolt Hole

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ATRO Torque Rod Bushing 5/8
Torque Rod Bushing 5/8" Bolt Hole

TS50-22691 5/8" Bolt Hole

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ATRO Tapered Torque Rod Bushing TT50-22809
Tapered Torque Rod Bushing

TT50-22809

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ATRO Two-Piece Torque Rods TR71000, TR75000
Two-Piece Torque Rods

TR71000 Female
TR75000 Male

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Details

Hendrickson Primaax suspension details
Hendrickson Primaax

Frame, frame bracket, and ATRO PB50-26648.