OPTIMAAX® Liftable Forward
Tandem Axle and Suspension
System for Freightliner Vehicles
SUBJECT: Service Instructions
LIT NO: 17730-309
DATE: November 2018
REVISION: A
TABLE OF CONTENTS
Section 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2

Section 7

Section 2

Product Description . . . . . . . . . . . . . . . . . 3

Section 3

Important Safety Notice. . . . . . . . . . . . . . 4

Section 4

Special Tools . . . . . . . . . . . . . . . . . . . . . . . 9

Section 5

Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . 10

Lift Air Spring. . . . . . . . . . . . . . . . . . . . . . . . 26

Section 6

Preventive Maintenance

Shock absorber. . . . . . . . . . . . . . . . . . . . . . 27

Hendrickson Recommended
Inspection Intervals . . . . . . . . . . . . . . . . 12

Axle Beam Assembly. . . . . . . . . . . . . . . . . . 28

Axle Alignment . . . . . . . . . . . . . . . . . . . . . . 21

Section 8

Ride Air Spring. . . . . . . . . . . . . . . . . . . . . . . 25

TRI-FUNCTIONAL Bushing . . . . . . . . . . . . . . 29
Frame Hanger. . . . . . . . . . . . . . . . . . . . . . . 37

Frame Hanger. . . . . . . . . . . . . . . . . . . . . . . 13

TRI-FUNCTIONAL Bushing . . . . . . . . . . . . . . 14
Thrust Washers. . . . . . . . . . . . . . . . . . . . . . 16
Tire Inspection. . . . . . . . . . . . . . . . . . . . . . . 17
Shock Absorber. . . . . . . . . . . . . . . . . . . . . . 19

Component Replacement
Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Component Inspection . . . . . . . . . . . . . . . . 12

Axle beam Assembly End Hub. . . . . . . . . . . 13

Alignment & Adjustments

Cross Member. . . . . . . . . . . . . . . . . . . . . . . 39

Section 9

Troubleshooting Guide. . . . . . . . . . . . . . 41

Section 10 Torque Specifications. . . . . . . . . . . . . . . 42
Section 11 Reference Material. . . . . . . . . . . . . . . . . 44

OPTIMAAX® for Freightliner Vehicles
SECTION 1

Introduction
This publication is intended to acquaint and assist maintenance personnel in the preventive
maintenance, service, repair, and rebuild of the OPTIMAAX® liftable forward tandem axle and
suspension system for applicable Freightliner Vehicles.
NOTE

Use only Hendrickson Genuine parts for servicing this suspension system.
It is important to read and understand the entire Technical Procedure publication prior to performing any maintenance, service, repair, or rebuild of the product. The information in this publication
contains parts lists, safety information, product specifications, features, proper maintenance,
service, repair and rebuild instructions for the OPTIMAAX liftable forward tandem axle and suspension system.
Refer to Hendrickson Literature No. 17730-310 for additional service instructions for OPTIMAAX
lift axle system air controller module.
Hendrickson reserves the right to make changes and improvements to its products and
­publications at any time. Contact Hendrickson Tech Services for information on the latest version
of this manual at 1-866-755-5968 (toll-free U.S. and Canada), 1-630-910-2800 (outside U.S. and
Canada) or email: techservices@hendrickson‑intl.com.
The latest revision of this publication is available online at www.hendrickson-intl.com.

Introduction

2

17730-309

OPTIMAAX® for Freightliner Vehicles
SECTION 2

Product Description
Hendrickson’s OPTIMAAX® liftable forward tandem axle and suspension system is a 6×2 solution
to help fleets save fuel cost and weight with comparable handling to 6×4 tandem axle configurations. Operating as a liftable axle in the forward tandem position, this system provides versatility
for fleets with variable loads.
OPTIMAAX is Ideal for diminishing load carriers such as: bulk haulers, grocery, livestock, beverage
or applications experiencing empty back hauls. It includes integrated lift axle, suspension and
automated controls. OPTIMAAX is available in 20,000 pound capacity and is compatible with
drum brakes and disc brakes.
FIGURE 2-1

■■ OPTIMIZE Automated Controls — Proprietary program logic controls lift axle movement and

load transfer. Fully automated controls eliminates driver intervention and training. Automates
axle lowering and lifting by sensing load capacities.

■■ OPTIMIZE Savings — Achieves up to three percent additional fuel economy improvement

through eliminating one (1) drive axle (6×2 configuration). Provides up to two percent additional fuel economy improvement through lifting the non-drive axle (4×2 configuration).

■■ OPTIMIZE Traction and Handling — Lifted axle position provides increased traction by

increasing drive axle load. Improved traction when backing under trailers in soft soil or wet
conditions versus traditional 6×2. Maintains vehicle handling characteristics by keeping the
drive axle behind the fifth wheel.

OPTIMAAX® SPECIFICATIONS

17730-309

Suspension Rating

20,000 lbs

Installed Weight

635 lbs

Ride Heights

7.8"

Axle Travel

7.6"

3

Product Description

OPTIMAAX® for Freightliner Vehicles
SECTION 3

Important Safety Notice
Proper maintenance, service and repair is important to the reliable operation of the suspension.
The procedures recommended by Hendrickson and described in this technical publication are
methods of performing such maintenance, service and repair.
The warnings and cautions should be read carefully to help prevent personal injury and to assure
that proper methods are used. Improper maintenance, service or repair may d­ amage the vehicle,
cause personal injury, render the vehicle unsafe in operation, or void manufacturer’s warranty.
Failure to follow the safety precautions in this manual can result in personal injury and / or property damage. Carefully read and understand all safety related information within this publication,
on all decals and all such materials provided by the vehicle manufacturer before conducting any
maintenance, service or repair.
■■

EXPLANATION OF SIGNAL WORDS

Hazard “Signal Words” (Danger-Warning-Caution) appear in various locations throughout this
publication. Information accented by one of these signal words must be observed to help minimize the risk of personal injury to service personnel, or possibility of improper service methods
which may damage the vehicle or render it unsafe.
This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or
death.
Additional ‘Notes’ or ‘Service Hints’ are utilized to emphasize areas of procedural importance and
provide suggestions for ease of repair. The following definitions indicate the use of these signal
words as they appear throughout the publication.
INDICATES AN IMMINENTLY HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, WILL RESULT IN SERIOUS
INJURY OR DEATH.
INDICATES A POTENTIAL HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, CAN RESULT IN SERIOUS
INJURY OR DEATH.
INDICATES A POTENTIAL HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, MAY RESULT IN MINOR OR
MODERATE INJURY, OR PROPERTY DAMAGE.

NOTE

An operating procedure, practice condition, etc. which is essential to emphasize.

SERVICE HINT

A helpful suggestion, which will make the servicing being performed a little easier and / or faster.
Also note that particular service operations may require the use of special tools designed for
specific purposes. These special tools can be found in the Special Tools section of this p­ ublication.
The torque symbol alerts you to tighten fasteners to a specified torque value. Refer to Torque
Specifications section of this publication.

Important Safety Notice

4

17730-309

OPTIMAAX® for Freightliner Vehicles
■■

NOTE

SAFETY PRECAUTIONS

REPLACE ANY SAFETY DECALS THAT ARE FADED, TORN, MISSING, ILLEGIBLE, OR OTHERWISE DAMAGED.
CONTACT HENDRICKSON TO ORDER REPLACEMENT LABELS.

FASTENERS
DISCARD USED FASTENERS. ALWAYS USE NEW FASTENERS TO COMPLETE A REPAIR. FAILURE TO DO
SO COULD RESULT IN FAILURE OF THE PART, OR MATING COMPONENTS, ADVERSE VEHICLE HANDLING,
PERSONAL INJURY, OR PROPERTY DAMAGE.
LOOSE OR OVER TORQUED FASTENERS CAN CAUSE COMPONENT DAMAGE, ADVERSE VEHICLE
HANDLING, PROPERTY DAMAGE, OR SEVERE PERSONAL INJURY. MAINTAIN CORRECT TORQUE VALUE
AT ALL TIMES. CHECK TORQUE VALUES ON A REGULAR BASIS AS SPECIFIED, USING A TORQUE WRENCH
THAT IS REGULARLY CALIBRATED.TORQUE VALUES SPECIFIED IN THIS TECHNICAL PUBLICATION ARE FOR
HENDRICKSON SUPPLIED FASTENERS ONLY. IF NON HENDRICKSON FASTENERS ARE USED, FOLLOW
TORQUE SPECIFICATION LISTED IN THE VEHICLE MANUFACTURER’S SERVICE MANUAL.

AIR SPRING INFLATION AND DEFLATION
PRIOR TO DISASSEMBLY OF THE SUSPENSION, AIR SPRING ASSEMBLIES MUST BE DEFLATED.
UNRESTRICTED AIR SPRING ASSEMBLIES CAN VIOLENTLY SHIFT. DO NOT INFLATE AIR SPRING
ASSEMBLIES WHEN THEY ARE UNRESTRICTED. AIR SPRING ASSEMBLIES MUST BE RESTRICTED
BY SUSPENSION OR OTHER ADEQUATE STRUCTURE. DO NOT INFLATE BEYOND PRESSURES
RECOMMENDED BY AIR SPRING MANUFACTURER, CONTACT HENDRICKSON TECHNICAL SERVICES
FOR DETAILS. IMPROPER USE OR OVER INFLATION MAY CAUSE AIR SPRING ASSEMBLIES TO BURST,
CAUSING PROPERTY DAMAGE AND / OR SEVERE PERSONAL INJURY.
PRIOR TO AND DURING DEFLATION AND INFLATION OF THE AIR SUSPENSION SYSTEM, ENSURE ALL
PERSONNEL AND EQUIPMENT ARE CLEAR FROM UNDER THE VEHICLE AND AROUND THE SERVICE
AREA, FAILURE TO DO SO CAN CAUSE SERIOUS PERSONAL INJURY, DEATH, OR PROPERTY DAMAGE.

AIR SPRING INFLATION
INFLATE THE SUSPENSION SLOWLY AND MAKE SURE THE RUBBER BLADDER OF THE AIR SPRING
INFLATES UNIFORMLY AND IS NOT BINDING. FAILURE TO DO SO CAN CAUSE DAMAGE TO THE AIR
SPRING AND / OR MOUNTING BRACKETS AND VOID WARRANTY.

AIR SPRING LOWER MOUNTING STUDS
IF THE AIR SPRING IS BEING REMOVED FOR AN ALTERNATE REPAIR, IT IS MANDATORY TO LUBRICATE THE
LOWER AIR SPRING FASTENERS WITH PENETRATING OIL AND REMOVE WITH HAND TOOLS TO PREVENT
DAMAGE TO THE LOWER AIR SPRING MOUNTING STUD. FAILURE TO DO SO CAN CAUSE COMPONENT
DAMAGE AND VOID WARRANTY.

MODIFYING COMPONENTS
DO NOT MODIFY OR REWORK PARTS WITHOUT AUTHORIZATION FROM HENDRICKSON. DO NOT
SUBSTITUTE REPLACEMENT COMPONENTS NOT AUTHORIZED BY HENDRICKSON. USE OF MODIFIED,
REWORKED, SUBSTITUTE OR REPLACEMENT PARTS NOT AUTHORIZED BY HENDRICKSON MAY NOT
MEET HENDRICKSON’S SPECIFICATIONS, AND CAN RESULT IN FAILURE OF THE PART, ADVERSE VEHICLE
HANDLING, POSSIBLE PERSONAL INJURY OR PROPERTY DAMAGE, AND WILL VOID ANY APPLICABLE
WARRANTIES. USE ONLY HENDRICKSON AUTHORIZED REPLACEMENT PARTS.

REPAIR OR RECONDITIONING
THE REPAIR OR RECONDITIONING OF SUSPENSION OR AXLE COMPONENTS IS NOT ALLOWED. ANY AXLE
COMPONENTS FOUND TO BE DAMAGED OR OUT OF SPECIFICATIONS MUST BE REPLACED. ALL MAJOR
HENDRICKSON COMPONENTS ARE HEAT TREATED AND TEMPERED. COMPONENTS CANNOT BE BENT,
WELDED, HEATED, OR REPAIRED WITHOUT REDUCING THE STRENGTH OR LIFE OF THE COMPONENT.
FAILURE TO FOLLOW THESE GUIDELINES CAN CAUSE ADVERSE VEHICLE HANDLING, POSSIBLE PERSONAL
INJURY, DEATH, OR PROPERTY DAMAGE AND WILL VOID APPLICABLE WARRANTIES.

17730-309

5

Important Safety Notice

OPTIMAAX® for Freightliner Vehicles
PERSONNEL PROTECTIVE EQUIPMENT
ALWAYS WEAR PROPER EYE PROTECTION AND OTHER REQUIRED PERSONAL PROTECTIVE EQUIPMENT
TO HELP PREVENT PERSONAL INJURY WHEN PERFORMING VEHICLE MAINTENANCE, REPAIR OR SERVICE.

LOAD CAPACITY
ADHERE TO THE PUBLISHED CAPACITY RATINGS FOR THE SUSPENSIONS. ADD-ON AXLE ATTACHMENTS
(I.E. SLIDING FIFTH WHEELS) AND OTHER LOAD TRANSFERRING DEVICES CAN INCREASE THE
SUSPENSION LOAD ABOVE THE RATED AND APPROVED CAPACITIES WHICH COULD RESULT IN FAILURE
AND ADVERSE VEHICLE HANDLING, POSSIBLY CAUSING PERSONAL INJURY OR PROPERTY DAMAGE.

PROCEDURES AND TOOLS
A MECHANIC USING A SERVICE PROCEDURE OR TOOL WHICH HAS NOT BEEN RECOMMENDED BY
HENDRICKSON MUST FIRST SATISFY HIMSELF THAT NEITHER HIS SAFETY NOR THE VEHICLE’S SAFETY
WILL BE JEOPARDIZED BY THE METHOD OR TOOL SELECTED. INDIVIDUALS DEVIATING IN ANY MANNER
FROM THE INSTRUCTIONS PROVIDED ASSUME ALL RISKS OF POTENTIAL PERSONAL INJURY OR
DAMAGE TO EQUIPMENT INVOLVED.

TORCH / WELDING
DO NOT USE A CUTTING TORCH TO REMOVE ANY FASTENERS. THE USE OF HEAT ON SUSPENSION
COMPONENTS WILL ADVERSELY AFFECT THE STRENGTH OF THESE PARTS. A COMPONENT DAMAGED
IN THIS MANNER CAN RESULT IN THE ADVERSE VEHICLE HANDLING AND POSSIBLE PERSONAL INJURY
OR PROPERTY DAMAGE.
EXERCISE EXTREME CARE WHEN HANDLING OR PERFORMING MAINTENANCE IN THE AREA OF THE
SPRING ASSEMBLY AND AXLE. DO NOT CONNECT ARC WELDING GROUND LINE TO THE SPRING
ASSEMBLY OR AXLE. DO NOT STRIKE AN ARC WITH THE ELECTRODE ON THE SPRING ASSEMBLY OR
AXLE. DO NOT USE HEAT NEAR THE SPRING ASSEMBLY OR AXLE. DO NOT NICK OR GOUGE THE SPRING
ASSEMBLY OR AXLE. SUCH IMPROPER ACTIONS CAN DAMAGE THE SPRING ASSEMBLY OR THE AXLE, AND
CAN CAUSE ADVERSE VEHICLE HANDLING AND POSSIBLE PERSONAL INJURY OR PROPERTY DAMAGE.

SUPPORT THE VEHICLE PRIOR TO SERVICING
PLACE THE VEHICLE ON A LEVEL FLOOR AND CHOCK THE WHEELS TO HELP PREVENT THE VEHICLE
FROM MOVING. PRIOR TO SERVICING A VEHICLE IN THE RAISED POSITION, PROPERLY SUPPORT THE
VEHICLE WITH SAFETY STANDS. DO NOT WORK AROUND OR UNDER A RAISED VEHICLE SUPPORTED
ONLY WITH FLOOR JACKS OR OTHER LIFTING DEVICES, FAILURE TO DO SO CAN CAUSE DEATH,
PERSONAL INJURY OR DAMAGE TO COMPONENTS.

SUPPORT THE LIFT AXLE PRIOR TO SERVICING
PLACE THE VEHICLE ON A LEVEL FLOOR AND CHOCK THE WHEELS TO HELP PREVENT THE VEHICLE
FROM MOVING. PRIOR TO SERVICING A LIFT AXLE IN THE RAISED POSITION, (1) PROPERLY SUPPORT
THE LIFT AXLE WITH SAFETY STANDS, AND (2) RELEASE ALL AIR PRESSURE IN THE LIFT AXLE AIR
SPRINGS AND RIDE SPRINGS. DO NOT WORK AROUND OR UNDER A RAISED LIFT AXLE SUPPORTED
ONLY WITH FLOOR JACKS OR OTHER LIFTING DEVICES, FAILURE TO DO SO CAN CAUSE DEATH,
PERSONAL INJURY OR DAMAGE TO COMPONENTS.

WELDING HARDWARE TO AXLES
WHEN WELDING TO OR ON THE AXLE, TAKE EVERY CAUTION TO PREVENT BEARING DAMAGE. WHEN
GROUNDING WELDING EQUIPMENT TO THE AXLE, PREVENT CURRENT FROM PASSING THROUGH THE
WHEEL BEARINGS.
A CONNECTION THAT PLACES A WHEEL BEARING BETWEEN THE GROUND CABLE CONNECTION AND
THE WELD AREA CAN DAMAGE THE BEARING BY ELECTRIC ARCING.

IMPROPER JACKING METHOD
IMPROPER JACKING METHOD CAN CAUSE STRUCTURAL DAMAGE AND RESULT IN ADVERSE VEHICLE
HANDLING, SEVERE PERSONAL INJURY OR DEATH. DO NOT USE AXLE BEAM OUTBOARD OF AXLE
SPRING SEATS. REFER TO VEHICLE MANUFACTURER FOR PROPER JACKING INSTRUCTIONS.
Important Safety Notice

6

17730-309

OPTIMAAX® for Freightliner Vehicles
LIFT AXLE RAPID AUTOMATIC MOVEMENT

FIGURE 3-1 P
roduct / Safety Decal 60905‑048

LIFT AXLE RAPID, AUTOMATIC MOVEMENT CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.
THE LIFT AXLE CONTROL SYSTEM IS PROGRAMMED TO
AUTOMATICALLY:
LOWER THE LIFT AXLE IF –
■■
A LOAD ON THE PRIMARY REAR SUSPENSION
IS ABOVE A PRESET VALUE, OR
■■
THE PARKING BRAKE IS ENGAGED, OR
■■
THE IGNITION SWITCH IS OFF, OR
■■
A MAJOR SYSTEM FAULT IS DETECTED
RAISE THE LIFT AXLE IF –
■■
1) THE PARKING BRAKE IS DISENGAGED,
AND 2) A LOAD ON THE PRIMARY REAR
SUSPENSION IS BELOW A PRE-SET VALUE.

LIFT AXLE LOADING / UNLOADING
■■ ENSURE ALL PERSONNEL ARE CLEAR OF LIFT

AXLE DURING VEHICLE LOADING / UNLOADING
AND OPERATION.
■■ ENGAGE THE PARKING BRAKE DURING VEHICLE
LOADING / UNLOADING.

PRIOR TO SERVICE
■■ EXHAUST ALL PRESSURE IN LIFT AXLE AIR SPRINGS AND VEHICLE AIR SYSTEM BEFORE WORKING

ON OR AROUND LIFT AXLE.

■■ REMOVE 15 AMP FUSE FROM F15 LOCATION, REFER TO HENDRICKSON LITERATURE NO.

17730-310.

AIR CONTROLLER MANIFOLD
HOT AIR CONTROLLER MANIFOLD SURFACE CAN CAUSE BURNS. DO NOT TOUCH. ALLOW MANIFOLD TO
COOL BEFORE SERVICING, SEE FIGURES 3-2 AND 3-3.
FIGURE 3-2

17730-309

FIGURE 3-3

7

Important Safety Notice

OPTIMAAX® for Freightliner Vehicles
ELECTRICAL SYSTEM
DO NOT WORK ON THE VEHICLE ELECTRICAL SYSTEM WITH THE VEHICLE POWER ON. DAMAGE TO
VEHICLE ELECTRICAL SYSTEM AND / OR UNEXPECTED AXLE MOVEMENT MAY RESULT.

WIRING HARNESS
ENSURE THERE IS SUFFICIENT FREE MOVEMENT IN AIR CONTROLLER WIRING HARNESS TO PREVENT
WIRES AND CONNECTIONS FROM BEING UNDER TENSION DURING INSTALLATION. FAILURE TO DO SO
MAY DAMAGE OR FRAY THE CABLES.

SYSTEM INSTALLATION
IT IS THE RESPONSIBILITY OF THE INSTALLER OF THE AIR CONTROLLER MODULE AND OTHER OPTIMAAX
SYSTEM COMPONENTS TO ENSURE PROPER INSTALLATION. ANY INSTALLATION DEVIATIONS MUST
BE APPROVED, IN WRITING, BY HENDRICKSON’S PRODUCT ENGINEERING DEPARTMENT. ANNUAL
INSPECTION OF SYSTEM PRESSURE SENSORS IS REQUIRED TO CHECK FOR PROPER LOADING ON
DRIVE AXLE AND STEER AXLE. FAILURE TO COMPLY WITH ANY OF THE ABOVE WILL VOID APPLICABLE
WARRANTIES.

PARTS CLEANING
SOLVENT CLEANERS CAN BE FLAMMABLE, POISONOUS AND CAUSE BURNS. TO HELP AVOID SERIOUS
PERSONAL INJURY, CAREFULLY FOLLOW THE MANUFACTURER’S PRODUCT INSTRUCTIONS AND
GUIDELINES AND THE FOLLOWING PROCEDURE:

1. WEAR PROPER EYE PROTECTION
2. WEAR CLOTHING THAT PROTECTS YOUR SKIN
3. WORK IN A WELL VENTILATED AREA
4. DO NOT USE GASOLINE, OR SOLVENTS THAT CONTAIN GASOLINE. GASOLINE CAN EXPLODE
5. HOT SOLUTION TANKS OR ALKALINE SOLUTIONS MUST BE USED CORRECTLY. FOLLOW THE
MANUFACTURER’S RECOMMENDED INSTRUCTIONS AND GUIDELINES CAREFULLY TO HELP
PREVENT PERSONAL ACCIDENT OR INJURY
DO NOT USE HOT SOLUTION TANKS OR WATER AND ALKALINE SOLUTIONS TO CLEAN GROUND OR
POLISHED PARTS. DOING SO WILL CAUSE DAMAGE TO THE PARTS AND VOID ANY APPLICABLE WARRANTY.

Important Safety Notice

8

17730-309

OPTIMAAX® for Freightliner Vehicles
SECTION 4

Special Tools
TRI-FUNCTIONAL® III BUSHING TOOL
Hendrickson Part No. 66086-122
Use with 35⁄8" wide bushings

SHEAR HEAD BOLT-E20 1" SOCKET TOOL
Hendrickson Part No. A-24536
For Service

17730-309

9

Special Tools

OPTIMAAX® for Freightliner Vehicles
SECTION 5

Parts List

Parts List

10

17730-309

OPTIMAAX® for Freightliner Vehicles

KEY NO. PART NO.
DESCRIPTION

VEHICLE
QTY.

1

Frame Hanger
79651-001 Left Hand
79651-002 Right Hand
2
80100-001
Cross Member
3
**M16 Huck Bolt
4
**M16 Huck Locknut

QUIK-ALIGN Service Kit, Includes Key Nos. 5-10
60632-042
Axle Set
34013-280
One Side
34013-281
QUIK-ALIGN Collar Service Kit, One Side
Includes Key Nos. 5-9
5
*QUIK-ALIGN Eccentric Collar
6
*QUIK-ALIGN Concentric Collar
34013-282
QUIK-ALIGN Fastener Service Kit, One Side
Includes Key Nos. 7-9
7
*Shear Round Head Bolt
8
*7⁄8" Hardened Steel Washer
9
*7⁄8" Prevailing Torque Heavy Hex Nut

TRI-FUNCTIONAL III Bushing Service Kit
34013-283
Axle Set, Includes Key Nos. 10, 12, 36
34013-284
One Side, Includes Key Nos. 10, 12, 36
34013-285
One Side, Includes Key Nos. 7-9, 12, 36
34013-286
Thrust Washer Service Kit, One Side
10
*Thrust Washer
11
79357-004
Axle Beam Assembly, Includes Key No. 12
75.5 Wide Track, 33.4" Frame Width
12
*TRI-FUNCTIONAL III Bushing
34013-237
Axle Stop Service Kit, Axle Set
Includes Key Nos. 13-14

Axle Stop
13
79887-001 Left Hand
14
79887-002 Right Hand
15
79191-004
Ride Air Spring
49177-006
Ride Air Spring Fasteners Service Kit, Axle Set
Includes Key Nos. 16-17

KEY NO. PART NO.
DESCRIPTION
16
17

VEHICLE
QTY.

½" Lower Ride Air Spring Washer
2
½"-13 UNC Lower Ride Air Spring Locknut
2
Lift Air Spring Service Kits, One Side,
Includes Key Nos. 18-21
18
*Lift Air Spring
2