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Hendrickson PRIMAAX EX - User Manual

Hendrickson PRIMAAX EX
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PRIMAAX
®
EX / PRIMAAX
®
for
Volvo Vehicles
SUBJECT: Service Instructions
LIT NO: 17730-254
DATE: March 2012 REVISION: B
TABLE OF CONTENTS
Section 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
Section 2 Product Description . . . . . . . . . . . . . . . . . 2
Section 3 Important Safety Notice . . . . . . . . . . . . . . 4
Section 4 Special Tools . . . . . . . . . . . . . . . . . . . . . . . 9
Section 5 Parts Lists . . . . . . . . . . . . . . . . . . . . . . . . . 12
PRIMAAX EX . . . . . . . . . . . . . . . . . . . . . . . . . 12
PRIMAAX . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Section 6 Preventive Maintenance. . . . . . . . . . . . . 16
Areas of Inspection . . . . . . . . . . . . . . . . . . . 16
Hendrickson Recommended
Preventive Maintenance Intervals . . . . . . . . 16
Component Inspection . . . . . . . . . . . . . . . . 18
U-bolt Fasteners . . . . . . . . . . . . . . . . . . . . . 19
Transverse Torque Rods . . . . . . . . . . . . . . . . 20
Longitudinal Torque Rods . . . . . . . . . . . . . . 20
Shock Absorber . . . . . . . . . . . . . . . . . . . . . . 21
Air Fitting Inspection . . . . . . . . . . . . . . . . . . 22
Section 7 Alignment & Adjustments . . . . . . . . . . . 23
Ride Height Adjustment . . . . . . . . . . . . . . . . 23
Lateral Alignment . . . . . . . . . . . . . . . . . . . . 23
Axle Pinion Angle . . . . . . . . . . . . . . . . . . . . 24
Drive Axle Alignment Inspection Procedure
(Scrub Angle) . . . . . . . . . . . . . . . . . . . . . . . 24
Alignment Adjustment Instructions . . . . . . . 26
Pinion Angle Adjustment . . . . . . . . . . . . . . . 28
Section 8 Component Replacement . . . . . . . . . . . 29
Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Height Control Valve . . . . . . . . . . . . . . . . . . 29
Air Spring . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Shock Absorber . . . . . . . . . . . . . . . . . . . . . . 31
Transverse Torque Rod . . . . . . . . . . . . . . . . . 32
Longitudinal Torque Rod . . . . . . . . . . . . . . . 32
Longitudinal Torque Rod Bushing . . . . . . . . . 33
Support Beam Assembly and Cross Tube . . . 34
U-beam Assembly . . . . . . . . . . . . . . . . . . . . 35
D-pin Bushing . . . . . . . . . . . . . . . . . . . . . . . 38
QUIK-ALIGN Pivot Bushing . . . . . . . . . . . . . . 43
Top Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Bottom Cap and Axle Spacer . . . . . . . . . . . . 47
Axle Stops . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Frame Hanger . . . . . . . . . . . . . . . . . . . . . . 50
Section 9 Torque Speci cations . . . . . . . . . . . . . . . 54
PRIMAAX EX . . . . . . . . . . . . . . . . . . . . . . . . . 54
PRIMAAX . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Section 10 Troubleshooting Guide . . . . . . . . . . . . . . 58

Table of Contents

Questions and Answers

  • N
    nathanielwilsonAug 15, 2025
    Why is my Hendrickson PRIMAAX EX suspension harsh?
    • L
      Lauren LawrenceAug 15, 2025
      A harsh or bumpy ride in your Hendrickson Automobile Accessories suspension can occur due to several reasons: * The air spring might not be inflated correctly or could be damaged. In this case, repair the air system and check the ride height. * The ride height may be set incorrectly. Adjust it to the proper setting. * The suspension might be overloaded. Redistribute the load to achieve the correct weight. * A support beam could be broken. If so, replace the broken support beam assembly.
  • K
    kirkscottAug 18, 2025
    What to do if Hendrickson Automobile Accessories vehicle is leaning?
    • M
      Melissa KlineAug 18, 2025
      If your Hendrickson Automobile Accessories vehicle is leaning, consider the following potential causes and solutions: * The air spring may not be inflated to the correct level or could be damaged. Repair the air system and check the ride height. * The load might not be centered. Redistribute the load. * The frame could be twisted. Straighten the frame according to the vehicle manufacturer's guidelines. * A support beam could be broken. Replace the broken support beam assembly. * The axle housing may be bent or broken. Replace the axle housing per the vehicle manufacturer's guidelines and align the vehicle. * U-bolts might be loose. Tighten U-bolts to the specified torque. * There may be an issue with the front suspension. Inspect and repair the front suspension.
  • B
    bsmithAug 21, 2025
    Why Hendrickson Automobile Accessories air springs deflate when parked?
    • J
      jasonsheaAug 21, 2025
      If the air springs in your Hendrickson Automobile Accessories system deflate when parked, it could be due to: * A leak in the air system. Inspect air fittings and repair the air system, then check the ride height. * A malfunctioning height control valve. Replace the height control valve following the vehicle manufacturer’s guidelines.
  • J
    Jeffrey FrancoAug 25, 2025
    What causes irregular tire wear on Hendrickson PRIMAAX EX Automobile Accessories?
    • L
      Lisa SuarezAug 25, 2025
      Irregular tire wear on your Hendrickson Automobile Accessories can be caused by: * Incorrect tire inflation pressure. Correct the tire pressure according to the vehicle and tire manufacturer's specifications. * Worn QUIK-ALIGN bushing. Replace the QUIK-ALIGN bushing. * Loose QUIK-ALIGN attachment. Replace the QUIK-ALIGN connection and check vehicle alignment, adjusting if necessary. Also, check the frame hanger for wear around the QUIK-ALIGN plates and replace if needed. * Worn torque rod bushings. Replace the torque rod bushings as necessary.
  • J
    Jessica OrtizAug 28, 2025
    Why is my Hendrickson PRIMAAX EX suspension noisy?
    • J
      Jonathan MarshallAug 28, 2025
      A noisy Hendrickson Automobile Accessories suspension could be due to: * A loose QUIK-ALIGN attachment. Replace the QUIK-ALIGN connection and check the suspension alignment, adjusting if necessary. * Loose U-bolts. Tighten the U-bolts to the specified torque. * Loose end caps. Inspect the end caps and the support beam to cross tube connection for damage. Repair as necessary and re-torque the end cap to the specified torque. * Worn torque rod bushings. Replace the torque rod bushings as necessary.
  • S
    Shawn WellsSep 1, 2025
    What causes excessive driveline vibration in Hendrickson PRIMAAX EX Automobile Accessories?
    • S
      Stacey FarrellSep 1, 2025
      Excessive driveline vibration in your Hendrickson Automobile Accessories may be caused by: * Incorrect pinion angle(s). Adjust the pinion angle(s), referring to the Vehicle Manufacturer for specifications. * Ride height set incorrectly. Adjust the ride height to the proper setting. * Broken support beam. Replace the support beam assembly.
  • C
    Christopher BakerSep 4, 2025
    What to do if Hendrickson PRIMAAX EX suspension will not reach ride height?
    • R
      Ryan RichardsonSep 4, 2025
      If your Hendrickson Automobile Accessories suspension will not reach the correct ride height, consider these possibilities: * The suspension might be overloaded. Redistribute the load to the correct weight. * The air spring may be leaking or damaged. Replace the air spring. * There may be a leak in the air system. Inspect air fittings, and repair the air system, then check the ride height. * The air line could be obstructed or improperly connected. Repair the air system and check the ride height. * The height control valve dump port might be activated. Check the height control valve dump port for proper connection and function.
  • D
    David MontgomerySep 7, 2025
    What causes excessive frame slope in Hendrickson Automobile Accessories?
    • T
      Tracy ScottSep 7, 2025
      Excessive frame slope in Hendrickson Automobile Accessories can be attributed to: * Incorrect ride height settings. Adjust the vehicle’s front and rear ride height to the proper setting as per the vehicle manufacturer’s guidelines. * Overloaded suspension. Redistribute the load to correct weight.
  • M
    miguel11Sep 10, 2025
    What to do if Hendrickson Automobile Accessories vehicle is bouncing excessively?
    • S
      Steven FloresSep 12, 2025
      If your Hendrickson Automobile Accessories vehicle is bouncing excessively, it could be due to: * A damaged or leaking shock absorber. Replace the shock absorber. * The ride height being set incorrectly. Adjust the ride height to the proper setting.

Summary

Introduction

Product Description

Important Safety Notice

Explanation of Signal Words

Defines signal words like DANGER, WARNING, and CAUTION used in the manual for hazard identification.

Safety Precautions

Covers general safety rules for fasteners, load capacity, modifications, torch use, and component handling.

Specific Safety Warnings

Includes warnings related to U-beam assembly, cross tubes, shock absorbers, torque rods, and air springs.

Special Tools

QUIK-ALIGN Tool Descriptions

Details and diagrams for tools used to install and remove QUIK-ALIGN bushings.

D-Pin Tool Descriptions

Details and diagrams for tools used to install and remove D-Pin bushings.

PRIMAAX Quick Wrench Tool

Information on the OTC Quick Wrench tool for PRIMAAX EX/PRIMAAX suspensions.

Parts Lists

PRIMAAX EX Parts Diagram

Exploded view diagram showing components of the PRIMAAX EX suspension system.

PRIMAAX Parts Diagram

Exploded view diagram showing components of the PRIMAAX suspension system.

Preventive Maintenance

Areas of Inspection

Lists components to be inspected during routine preventive maintenance procedures.

Maintenance Intervals

Recommended inspection and service intervals for preventive maintenance tasks.

Component Inspections

Detailed inspection procedures for key suspension components like air springs and fasteners.

U-Bolt Fastener Maintenance

Procedures and intervals for checking and torquing U-bolt fasteners.

Alignment and Adjustments

Ride Height Adjustment

Information on the height control valve and its role in adjusting suspension ride height.

Lateral Alignment Procedure

Steps to measure and correct lateral alignment of the vehicle's drive axles.

Axle Pinion Angle Check

Procedure for checking the axle pinion angle using a digital protractor.

Drive Axle Alignment (Scrub Angle)

Procedure for inspecting and correcting drive axle alignment, focusing on scrub angle.

Alignment Adjustment Instructions

Detailed steps for adjusting axle alignment using QUIK-ALIGN collars.

Pinion Angle Adjustment

Procedures for adjusting pinion angle using shims or by replacing bottom caps.

Component Replacement

Air Spring Replacement

Detailed disassembly and assembly procedures for replacing the air spring.

Shock Absorber Replacement

Procedures for disassembling and assembling shock absorbers for replacement.

Torque Rod Replacement

Covers replacement of both transverse and longitudinal torque rods.

Bushing Replacement

Procedures for replacing various bushings including torque rod, D-pin, and QUIK-ALIGN pivot.

Beam;Tube;Cap Assembly Replacement

Procedures for replacing support beam, cross tube, and bottom cap assemblies.

Axle Stop and Frame Hanger Replacement

Covers replacement procedures for axle stops and frame hangers.

Torque Specifications

PRIMAAX EX Torque Specifications

Diagram and table showing recommended torque values for PRIMAAX EX components.

PRIMAAX Torque Specifications

Diagram and table showing recommended torque values for PRIMAAX components.

Troubleshooting Guide

Hendrickson PRIMAAX EX Specifications

General IconGeneral
BrandHendrickson
ModelPRIMAAX EX
CategoryAutomobile Accessories
LanguageEnglish