AIRTEK® Front Air Suspension
System for Tiffin Motorhome
Chassis
SUBJECT: Service Instructions
LIT NO: 17730-319
DATE: March 2019
REVISION: A
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. . . . . . . . . . . . . . . . . . . . . . . . . 10

Steering Stop . . . . . . . . . . . . . . . . . . . . . . . 31

Section 6

Towing Procedure . . . . . . . . . . . . . . . . . . 13

Toe Setting . . . . . . . . . . . . . . . . . . . . . . . . . 32

Section 7

Preventive Maintenance

Spring Eye Re-Torque . . . . . . . . . . . . . . . . . 33

Visual Inspection. . . . . . . . . . . . . . . . . . . . . 15

Section 8

Alignment & Adjustments
Alignment Definitions . . . . . . . . . . . . . . . . . 26
Inspection Prior to Alignment. . . . . . . . . . . . 28
Front Wheel Alignment . . . . . . . . . . . . . . . . 29
Ride Height Verification. . . . . . . . . . . . . . . . 31

Section 9

Component Replacement

Component Inspection . . . . . . . . . . . . . . . . 15

Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Lubrication Intervals . . . . . . . . . . . . . . . . . . 16

Air Spring . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Kingpin Lubrication. . . . . . . . . . . . . . . . . . . 16

Front Leaf Spring Frame Hanger . . . . . . . . . 37

Tie Rod End Lubrication. . . . . . . . . . . . . . . . 17

Rear Shackle Bracket. . . . . . . . . . . . . . . . . . 38

Tie Rod End. . . . . . . . . . . . . . . . . . . . . . . . . 17

Leaf Spring Assembly . . . . . . . . . . . . . . . . . 39

Height Control Valve . . . . . . . . . . . . . . . . . . 19

Shock Absorber. . . . . . . . . . . . . . . . . . . . . . 42

Brakes and Wheel Bearing End Play . . . . . . 20

Front Axle Assembly – STEERTEK NXT Axle . . 42

Clamp Group Re-Torque . . . . . . . . . . . . . . . 20

STEERTEK NXT Axle Removal . . . . . . . . . . . . 42

Kingpin Bushing . . . . . . . . . . . . . . . . . . . . . 20

Tie Rod End and Cross Tube. . . . . . . . . . . . . 55

Steering Knuckle. . . . . . . . . . . . . . . . . . . . . 21

Section 10 Front Wheel Alignment Specifications. 57

Surface Paint Wear . . . . . . . . . . . . . . . . . . . 22

Section 11 Troubleshooting Guide. . . . . . . . . . . . . . 58

Shock Absorber. . . . . . . . . . . . . . . . . . . . . . 22
Tire Inspection. . . . . . . . . . . . . . . . . . . . . . . 24

Section 12 Torque Specifications. . . . . . . . . . . . . . . 60
Section 13 Reference Material. . . . . . . . . . . . . . . . . 63

AIRTEK® for Tiffin Motorhome Chassis
SECTION 1

Introduction
This publication is intended to acquaint and assist maintenance personnel in the preventive
maintenance, service, repair and rebuild of the following Hendrickson equipment as installed on
applicable Tiffin Motorhome Chassis:
■■ AIRTEK® — An integrated front air suspension with the STEERTEK NXT axle
■■ STEERTEK NXT — A durable, lightweight, fabricated steer axle assembly

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 AIRTEK Suspensions and the STEERTEK NXT axle.
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 e-mail: techservices@hendrickson‑intl.com.
The latest revision of this publication is also available online at www.hendrickson-intl.com.

SECTION 2

Product Description
AIRTEK — An integrated front air suspension and fabricated steer axle that work together to form
an integrated torsion system. This lightweight system provides driver comfort and is ideal for a
variety of applications. Utilizing a system approach, Hendrickson has engineered and optimized
the following components to form a system delivering superior ride, stability and handling characteristics with reduced weight and maintenance.
■■ Air springs — Exclusive to Hendrickson, the lightweight air springs deliver a soft ride. The

“push-to-connect” air supply design also provide fast and easy installation and removal.

■■ Frame brackets — Optimized design delivers weight reduction and proven durability. The

front and rear frame brackets are common between the AIRTEK suspensions.

■■ Leaf spring assembly — With its innovative design, the leaf spring provides superior stability,

performance and a soft ride. The patented leaf spring shares loads with the air spring. Durable
rubber front and patented rear bushings are greaseless and only require periodic inspections.

■■ Shock absorbers — AIRTEK utilizes premium shocks that have been tested and tuned specifi-

cally for the suspension system.

STEERTEK NXT — Integrated into the AIRTEK system, the box-shaped design provides a stiffer axle
and resists torsional, longitudinal and vertical loads more effectively than traditional I-Beam axles.
Together with the front limbs of the leaf springs, the fabricated axle beam forms a torsion system,
enhancing roll stability characteristics and improving handling.
■■ Adjustable tie rod — To help maximize tire life, the tie rod easily adjusts toe-in / out.
■■ Axle clamp group — The Clamp Group consists of the top pad, ¾" hex bolts, washers, and

nylon locknuts

■■ Brake Compatibility — Compatible with ADB 22X air disc brakes.

Introduction

2

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AIRTEK® for Tiffin Motorhome Chassis
■■ Integrated axle seats — Integrated axle seats to improve ground clearance, reduce part

count, and simplify assembly.

■■ Steering knuckles — The steering and tie rod arms are integrated for increased strength

and reduced weight. The unique steering knuckle packaging delivers up to a maximum of
50° wheel cut. The two piece knuckle design makes replacing the kingpin bushings easier by
eliminating the need to remove the kingpins.

FIGURE 2-1

TECHNICAL NOTES
1. AIRTEK is approved for on-highway use; other applications must be pre-approved by
Hendrickson Sales Engineering. System capacity rating for the suspension represents maximum loads on tires at ground level.
2 The STEERTEK NXT axle is available with 70.9" kingpin intersection (KPI).
3. AIRTEK suspension weight includes frame and leaf springs, air springs, shocks, upper shock
brackets and axle clamp group.
4. STEERTEK NXT axle weight includes the axle beam, knuckle / steering arm assemblies and tie
rod assemblies.
6. AIRTEK is integral to and available exclusively with the STEERTEK NXT axle. This system is antilock braking system (ABS) ready. STEERTEK NXT is compatible with most industry standard
wheel ends and brakes. Contact OEM for more information.
7. The STEERTEK NXT axle product identification is etched on the center front of the axle beam,
see Figure 2-2, providing the following information:
Axle part number: Identifies the features of the axle beam.
Axle assembly number: Identifies the complete assembly, which includes the steering knuckles, bracket assemblies and tie rod assemblies
FIGURE 2-2
Approximate Location of
Product Identification

17730-319

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Product Description

AIRTEK® for Tiffin Motorhome Chassis
SECTION 3

Important Safety Notice
Proper maintenance, service and repair are 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.
This technical publication should be read carefully to help prevent personal injury and to assure
that proper methods are used. Improper maintenance, service or repair may ­damage the vehicle,
cause personal injury, render the vehicle unsafe in operation, or void the 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 in 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 publication.
The torque symbol alerts you to tighten fasteners to a specified torque value. Refer to Torque
Specifications Section of this publication.

Important Safety Notice

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AIRTEK® for Tiffin Motorhome Chassis
■■

SAFETY PRECAUTIONS

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, LOSS OF VEHICLE CONTROL,
PERSONAL INJURY, OR PROPERTY DAMAGE.
LOOSE OR OVER TORQUED FASTENERS CAN CAUSE COMPONENT DAMAGE, LOSS OF VEHICLE
CONTROL, PROPERTY DAMAGE, OR SEVERE PERSONAL INJURY. MAINTAIN CORRECT TORQUE VALUE
AT ALL TIMES. CHECK TORQUE VALUES ON A REGULAR BASIS AS SPECIFIED, USING A REGULARLY
CALIBRATED TORQUE WRENCH. 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. ALWAYS CHECK
TORQUE IN TIGHTENING DIRECTION.
AIR SPRINGS INFLATION AND DEFLATION
AIR SPRING ASSEMBLIES MUST BE COMPLETELY DEFLATED PRIOR TO LOOSENING ANY CLAMP
GROUP HARDWARE, OR OTHERWISE PERFORMING ANY MAINTENANCE, SERVICE OR REPAIR OF
THE SUSPENSION SYSTEM. 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 TO ENSURE 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.
WHEN SERVICING THE VEHICLE OR ATTACHING AN AIR SPRING AND THE VEHICLE IS ON THE GROUND,
PRIOR TO AIRING THE SUSPENSION SYSTEM MAKE CERTAIN THE AIR SPRING LOCATER IS INDEXED INTO
THE UPPER AIR SPRING BRACKET PROPERLY, AND THE AIR SPRING IS FULLY SEATED ON THE TOP PAD.
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN PREMATURE AIR SPRING FAILURE, CAUSE
PERSONAL INJURY, OR PROPERTY DAMAGE.
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 CAN RESULT IN FAILURE
AND LOSS OF VEHICLE CONTROL, POSSIBLY CAUSING PERSONAL INJURY OR PROPERTY DAMAGE.
SHOCK ABSORBERS
THE SHOCK ABSORBERS ARE THE REBOUND TRAVEL STOPS FOR THE SPRINGS. ANYTIME THE FRONT
AXLE ON AN AIRTEK SUSPENSION IS SUSPENDED IT IS MANDATORY THAT THE SHOCK ABSORBERS
REMAIN CONNECTED. FAILURE TO DO SO CAN CAUSE THE AIR SPRINGS TO EXCEED THEIR MAXIMUM
LENGTH, POSSIBLY CAUSING THE AIR SPRINGS TO SEPARATE FROM THE PISTON, OR CAUSE A
REVERSE ARCH IN THE STEEL LEAF SPRINGS, POSSIBLY RESULTING IN PREMATURE STEEL LEAF
SPRING FAILURE.
PERSONNEL PROTECTIVE EQUIPMENT
ALWAYS WEAR PROPER EYE PROTECTION AND OTHER REQUIRED PERSONAL PROTECTIVE
EQUIPMENT TO HELP PREVENT PERSONAL INJURY WHEN YOU PERFORM VEHICLE MAINTENANCE,
REPAIR OR SERVICE.
17730-319

5

Important Safety Notice

AIRTEK® for Tiffin Motorhome Chassis
SUPPORT THE VEHICLE PRIOR TO SERVICING
PLACE THE VEHICLE ON A LEVEL FLOOR AND CHOCK THE WHEELS TO PREVENT THE VEHICLE FROM
MOVING OR ROLLING. DO NOT WORK AROUND OR UNDER A RAISED VEHICLE SUPPORTED BY ONLY
A FLOOR JACK OR OTHER LIFTING DEVICE. ALWAYS SUPPORT A RAISED VEHICLE WITH RIGID SAFETY
STANDS. FAILURE TO DO SO CAN CAUSE SERIOUS PERSONAL INJURY OR DAMAGE TO EQUIPMENT.
REPAIR AND RECONDITIONING
THE REPAIR OR RECONDITIONING OF SUSPENSION OR AXLE COMPONENTS IS NOT ALLOWED, SEE
LABEL IN FIGURE 3-1. ANY AXLE COMPONENTS FOUND TO BE DAMAGED OR OUT OF SPECIFICATIONS
MUST BE REPLACED. ALL MAJOR HENDRICKSON COMPONENTS ARE HEAT TREATED AND TEMPERED.
AIRTEK COMPONENTS CANNOT BE BENT, WELDED, HEATED, OR REPAIRED WITHOUT REDUCING THE
STRENGTH OR LIFE OF THE COMPONENT. FAILURE TO FOLLOW THESE GUIDELINES CAN CAUSE LOSS
OF VEHICLE CONTROL, POSSIBLE PERSONAL INJURY, DEATH, OR PROPERTY DAMAGE AND WILL VOID
APPLICABLE WARRANTIES.
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, LOSS OF
VEHICLE CONTROL, POSSIBLE PERSONAL INJURY OR PROPERTY DAMAGE, AND WILL VOID ANY
APPLICABLE WARRANTIES. USE ONLY HENDRICKSON AUTHORIZED REPLACEMENT PARTS.
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 ATTACHING 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 LOSS OF VEHICLE CONTROL 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 CAUSE DAMAGE TO THE SPRING
ASSEMBLY OR THE AXLE COULD FAIL, AND CAN CAUSE LOSS OF VEHICLE CONTROL AND POSSIBLE
PERSONAL INJURY OR PROPERTY DAMAGE.
STEERTEK NXT AXLE SPRING SEATS
THE INTEGRATED AXLE SPRING SEATS ON THE STEERTEK NXT AXLE ARE NON-SERVICEABLE.
UNAUTHORIZED TAMPERING OF INTEGRATED AXLE SPRING SEATS CAN CAUSE COMPONENT AND
STRUCTURAL DAMAGE AND RESULT IN LOSS OF VEHICLE CONTROL, SEVERE PERSONAL INJURY OR
DEATH, PROPERTY DAMAGE, AND WILL VOID ANY APPLICABLE WARRANTY. DO NOT REMOVE, MODIFY
OR REPLACE INTEGRATED AXLE SPRING SEAT OR FASTENERS, SEE FIGURE 3-1.
AXLE KINGPINS
STEERTEK NXT IS A UNIQUE AXLE, IN THAT THE KINGPIN IS CRYOGENICALLY INSTALLED IN THE
AXLE. THE KINGPIN IS A NON-REPLACEABLE COMPONENT OF THE AXLE ASSEMBLY. DO NOT
TRY TO REMOVE THE KINGPIN. IF THE KINGPIN SHOWS SIGNS OF MOVEMENT, CONTACT THE
HENDRICKSON TECH SERVICES DEPARTMENT.

Important Safety Notice

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AIRTEK® for Tiffin Motorhome Chassis
DAMAGED AXLE COMPONENTS
IF A VEHICLE EQUIPPED WITH A STEERTEK NXT AXLE IS INVOLVED IN A CRASH, THE AXLE STEER
KNUCKLES MUST BE DISASSEMBLED AND A THOROUGH INSPECTION OF THE AXLE MUST BE PERFORMED
NOTING THE CONDITION OF THE AXLE BEAM, KINGPINS, AND KNUCKLE ASSEMBLIES, INCLUDING THE
AREAS OF AXLE TO KINGPIN INTERFACE FOR ANY DAMAGE, GAPS, KINGPIN MOVEMENT OR PLAY. IF
ANY COMPONENT APPEARS DAMAGED, OR THE KINGPINS APPEAR TO CONTAIN ANY DAMAGE, GAPS,
MOVEMENT OR PLAY, THE COMPLETE AXLE ASSEMBLY MUST BE REPLACED.
IN ADDITION, IN THE EVENT A CRASH RESULTS IN EXCESSIVE SIDE LOAD DAMAGE TO ADJACENT
PARTS, SUCH AS A BENT WHEEL, HUB, OR SPINDLE, IT IS STRONGLY RECOMMENDED TO REPLACE THE
COMPLETE AXLE ASSEMBLY.
CONTACT HENDRICKSON TECHNICAL SERVICES WITH ANY QUESTIONS. FAILURE TO REPLACE ANY
DAMAGED COMPONENTS CAN CAUSE LOSS OF VEHICLE CONTROL, POSSIBLE PERSONAL INJURY,
DEATH, OR PROPERTY DAMAGE AND WILL VOID ANY APPLICABLE WARRANTIES.
AXLE CAMBER
UNAUTHORIZED WELDING OR MODIFICATIONS CAN CAUSE CRACKS OR OTHER AXLE STRUCTURAL
DAMAGE AND RESULT IN LOSS OF VEHICLE CONTROL, SEVERE PERSONAL INJURY OR DEATH. DO NOT
BEND, WELD OR MODIFY AXLE WITHOUT AUTHORIZATION FROM HENDRICKSON TRUCK COMMERCIAL
VEHICLE SYSTEMS.
AXLE CAMBER IS NOT ADJUSTABLE. DO NOT CHANGE THE AXLE CAMBER ANGLE OR BEND THE AXLE
BEAM, SEE FIGURE 3-1. BENDING THE AXLE BEAM TO CHANGE THE CAMBER ANGLE CAN DAMAGE
THE AXLE AND REDUCE AXLE STRENGTH, WILL VOID HENDRICKSON’S WARRANTY AND CAN CAUSE
LOSS OF VEHICLE CONTROL, POSSIBLY CAUSING PERSONAL INJURY OR PROPERTY DAMAGE.
IMPROPER JACKING METHOD
IMPROPER JACKING METHOD CAN CAUSE STRUCTURAL DAMAGE AND RESULT IN LOSS OF VEHICLE
CONTROL, SEVERE PERSONAL INJURY OR DEATH. DO NOT USE AXLE BEAM OUTBOARD OF AXLE
SPRING SEATS. REFER TO VEHICLE MANUFACTURER FOR PROPER JACKING INSTRUCTIONS. REPLACE
ANY SAFETY DECALS THAT ARE FADED, TORN, MISSING, ILLEGIBLE, OR OTHERWISE DAMAGED. CONTACT
HENDRICKSON TO ORDER REPLACEMENT LABELS, SEE FIGURE 3‑1. DECAL PART NUMBER 60905-021
FIGURE 3-1
®

®

17730-319

7

Important Safety Notice

AIRTEK® for Tiffin Motorhome Chassis
OFF ROADWAY TOWING
WHEN A VEHICLE IS DISABLED AND EQUIPPED WITH A STEERTEK NXT AXLE, CARE MUST BE TAKEN TO
ENSURE THERE IS NO DAMAGE TO THE SUSPENSION OR AXLE WHEN TOWING THE VEHICLE. THE USE
OF TOW STRAPS ARE NECESSARY TO TOW A DISABLED VEHICLE FROM A REPAIR FACILITY PARKING
LOT INTO THE SHOP BAY. THE TOW STRAPS SHOULD BE CONNECTED TO THE TOW HOOKS PROVIDED
BY THE VEHICLE MANUFACTURER AT THE FRONT OF THE BUMPER. IF THE USE OF TOW HOOKS IS NOT
AN OPTION, THEN TOW STRAPS MAY BE WRAPPED AROUND THE FRONT STEERTEK NXT AXLE, (SEE
FIGURE 3-2) IN A MANNER THAT IS ACCEPTABLE FOR TOWING THE VEHICLE FROM A REPAIR FACILITY
PARKING LOT INTO THE SHOP BAY. DO NOT USE A TOW CHAIN AROUND THE FRONT STEERTEK NXT
AXLE TO TOW THE VEHICLE, DOING SO WILL DAMAGE THE AXLE AND VOID ANY APPLICABLE
WARRANTY, (SEE FIGURE 3-2). FOR DETAILED INSTRUCTIONS FOR ON-HIGHWAY TOWING, SEE
TOWING PROCEDURE SECTION IN THIS PUBLICATION.
FIGURE 3-2

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 PROCEDURES:

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

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AIRTEK® for Tiffin Motorhome Chassis
SECTION 4

Special Tools
KINGPIN BUSHING TOOL – ADJUSTABLE STRAIGHT FLUTE REAMER
The dimension of cutting diameter must
facilitate a range of 1.802"-1.812"

KINGPIN TOOLS
SHOP MADE TOOLS: The shop made tools are designed to install and remove kingpin bushings. Bushing tools are made
from cold rolled steel or equivalent. Drawings are for reference only. Hendrickson does not supply these tools.

17730-319

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Special Tools

AIRTEK® for Tiffin Motorhome Chassis
SECTION 5

Parts Lists

Parts Lists

10

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AIRTEK® for Tiffin Motorhome Chassis

KEY NO. PART NO.
DESCRIPTION
1
2
3
4

VEHICLE
QTY.

64075-002L
Air Spring
60850-001
Air Spring Bracket
58913-009L
Shock Absorber
59423-002
Upper Shock Bracket
34013-296
Shock Absorber Fasteners Service Kit,

One Side, Includes Key Nos. 5-9
5
22962-046
Shock Spacer
6
68716-369
¾"-16 UNF x 4½" Upper Shock Bolt
7
68716-370
¾"-16 UNF x 5" Lower Shock Bolt
8
22962-001
¾" Flat Washer
9
30191-000
¾"-16 UNF Locknut
10
53487-000
Leaf Spring Assembly
11
Top Pad
64516-001 Left Hand
64516-002 Right Hand

Top Pad Fasteners Service Kit, Includes
Key Nos. 12-14
34013-236
Axle Set
34013-297
One Side
12
21867-036
¾"-16 UNF x 5" Bolt
13
22962-001
¾" Flat Washer
14
17700-035
¾"-16 UNF Nylocknut
15