Hendrickson ULTIMAAX 58K Guide de référence
ULTIMAAX®Rear Suspension
for Fire and Rescue Vehicles
SUBJECT: Service Instructions
LIT NO: 17730-299
DATE: July 2018 REVISION: B
TABLE OF CONTENTS
Section 1 Introduction ........................2
Section 2 Product Description .................2
Section 3 Important Safety Notice ..............4
Section 4 Special Tools .......................8
Section 5 Parts List..........................10
Section 6 Preventive Maintenance
Hendrickson Recommended
Inspection Intervals ................13
Component Inspection ................13
Center Bushings .....................14
Equalizing Beam End Connection ........15
Bar Pin End Bushings .................18
Bar Pin Shims .......................18
Beam End Axle Brackets ...............19
Frame Hanger Assembly ...............20
Shear springs .......................20
Progressive Load Springs (PLS) ..........21
Saddle Connection ...................22
Cross Tube. . . . . . . . . . . . . . . . . . . . . . . . . . 23
Torque Rods ........................24
Shock Absorbers .....................25
Section 7 Alignment & Adjustments
Drive Axle Pinion Angle ................27
Drive Axle Alignment ..................27
Axle Lateral Alignment.................29
Bar Pin Alignment ....................29
Section 8 Component Replacement
Fasteners ..........................32
Shock Absorber ......................32
Shear Spring / Frame Hanger Assembly /
Saddle Assembly ..................33
Progressive Load Spring (PLS)...........38
Equalizing Beam.....................38
Equalizing Beam Center Bushing.........41
Bar Pin Style End Bushings .............44
Adapter Style End Bushings.............46
Cross Tube. . . . . . . . . . . . . . . . . . . . . . . . . . 50
Torque Rods ........................51
Torque Rod Bushings..................52
Section 9 Troubleshooting Guide ..............57
Section 10 Torque Specications ...............58
217730-299
ULTIMAAX®for Fire and Rescue Vehicles
SECTION 1
Introduction
This publication is intended to acquaint and assist maintenance personnel in the preventive
maintenance,service,and repair of the ULTIMAAX®Rear Rubber Suspension System for applicable
Fire and Rescue 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, or repair of this product.The information in this publica-
tion contains parts lists, safety information, product specifications, features, proper maintenance,
service, and repair instructions for ULTIMAAX suspensions.
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
The latest revision of this publication is available online at www.hendrickson-intl.com.
SECTION 2
Product Description
ULTIMAAX is an advanced severe-duty rear rubber suspension designed specifically for fire and
rescue applications to balance outstanding durability, empty ride quality, loaded stability and
mobility.Through its unique design, the system offers premium ride quality in both empty and
loaded conditions,with increasing stability as the load increases.
■ Equalizing beam — Formed and robotically welded to provide a narrow profile for weight
savings. Distributes load equally between axles to improve maneuverability, stability and
handling.Increases ground clearance with flat bottom design. Lowers the center of gravity to
increase stability.
■ Saddle — Triangular geometry provides structure and durability. Weight efficient design
helps to increase payload, while offering a considerable weight savings versus competitive
suspensions.
■ Frame hangers — Optimized design to balance durability and weight savings.Fabricated to
offer flexibility with multiple truck configurations.
■ Rubber shear springs — Primary springs in unloaded condition,providing superb ride quality.
React to longitudinal loads during braking and accelerating for minimal displacement.
■ Progressive load springs — Designed to balance empty ride quality and loaded stability.
Stiffness of progressive load spring increases as load increases,providing a unique balance
of empty ride quality and loaded stability.
■ Longitudinal torque rods — Engineered to optimize resistance to axle wind-up during accel-
eration and braking.
■ Transverse torque rods — Heavy-duty transverse torque rods ensure maximum lateral axle
control and straight line suspension stability.
17730-299 3
ULTIMAAX®for Fire and Rescue Vehicles
FIGURE 2-1
54K•58K Capacity
9½"•10"•10¼"•11½" Ride Height
63K Capacity
10"•10½" Ride Height
ULTIMAAX®SPECIFICATIONS
54K 58K 63K
Suspension Rating 54,000 lbs (24,494 kg) 58,000 lbs (26,308 kg) 63,000 lbs (28,576 kg)
Diagonal Articulation117½" (445 mm)
Ride Heights 9½"•10"•10¼"•11½" (241 mm,254 mm,260 mm,292 mm) 10", 10½" (254 mm, 267 mm)
Axle Spacing254" (1,372 mm) 54", 56" (1,372 mm, 1,422, mm)
Hendrickson approves the use of ULTIMAAX in fire / rescue applications. All such applications must comply with applicable Hendrickson
specifications and must also be approved by the respective vehicle manufacturer with the vehicle in its original, as-built configuration.
Contact Hendrickson and the respective vehicle manufacturer for approval of additional applications.
1. Suspension articulation may exceed vehicle’s capability and may be limited by vehicle manufacturer; vehicle manufacturer installed axle
stops may restrict suspension’s articulation.
2. Contact Hendrickson for availability of additional beam lengths.
For additional details regarding specifications, applications, capacities, operating service and maintenance instructions, refer to applicable
Hendrickson technical literature (available at www.hendrickson-intl.com) or contact Hendrickson at 1-866-768-5968.
Actual product performance may vary depending upon vehicle configuration, operation, service and other factors.
U.S. and foreign patents granted and / or pending.
417730-299
ULTIMAAX®for Fire and Rescue Vehicles
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 mini-
mize 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 haz-
ards.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 impor-
tance 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.
NOTE An operating procedure,practice condition, etc. which, is essential to emphasize.
SERVICE HINT A helpful suggestion that 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 the fasteners to a specific torque value. See Torque
Specifications Section of this publication.
17730-299 5
ULTIMAAX®for Fire and Rescue Vehicles
■ 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,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 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.
TORCH/WELDING
DO NOT USE A CUTTING TORCH TO REMOVE ANY FASTENERS OR BUSHINGS.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
EQUALIZING BEAM. DO NOT CONNECT ARC WELDING GROUND LINE TO THE EQUALIZING BEAM. DO
NOT STRIKE AN ARC WITH THE ELECTRODE ON THE EQUALIZING BEAM AND AXLE. DO NOT USE HEAT
NEAR THE EQUALIZING BEAM ASSEMBLY. DO NOT NICK OR GOUGE THE EQUALIZING BEAM. SUCH
IMPROPER ACTIONS CAN DAMAGE THE EQUALIZING BEAM ASSEMBLY AND CAUSE ADVERSE VEHICLE
HANDLING AND POSSIBLE PERSONAL INJURY OR PROPERTY DAMAGE.
LOAD CAPACITY
ADHERE TO THE PUBLISHED CAPACITY RATINGS FOR THE SUSPENSION. ADD-ON AXLE ATTACHMENTS
AND OTHER LOADTRANSFERRING DEVICES CAN INCREASE THE SUSPENSION LOAD ABOVE ITS RATED
AND APPROVED CAPACITIES, WHICH CAN RESULT IN COMPONENT DAMAGE AND ADVERSE VEHICLE
HANDLING, POSSIBLY CAUSING PERSONAL INJURY OR PROPERTY DAMAGE.
MODIFYING COMPONENTS
DO NOT MODIFY OR REWORK PARTS WITHOUT AUTHORIZATION FROM HENDRICKSON. DO NOT
USE SUBSTITUTE OR 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,AND POSSIBLE PERSONAL INJURY OR PROPERTY DAMAGE AND WILL
VOID WARRANTY. USE ONLY HENDRICKSON AUTHORIZED REPLACEMENT PARTS.
PERSONAL 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.
PROCEDURES AND TOOLS
A TECHNICIAN 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 WILL ASSUME ALL RISKS OF CONSEQUENTIAL PERSONAL INJURY
OR DAMAGE TO EQUIPMENT INVOLVED.
617730-299
ULTIMAAX®for Fire and Rescue Vehicles
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.
IMPROPER JACKING METHOD
IMPROPER JACKING METHODS CAN CAUSE STRUCTURAL DAMAGE WHICH CAN CAUSE ADVERSE
VEHICLE HANDLING, PROPERTY DAMAGE OR SEVERE PERSONAL INJURY AND WILL VOID
HENDRICKSON’S WARRANTY.
■ DO NOT USE THE SUSPENSION CROSS TUBE AS A JACKING POINT, SEE FIGURE 3-1, REFER TO
VEHICLE MANUFACTURER FOR PROPER JACKING INSTRUCTIONS.
■ ACCEPTABLE LIFTING POINTS FOR A VEHICLE AT THE RATED LOAD INCLUDE BUT ARE NOT
LIMITED TO:THE AXLE, EQUALIZING BEAM, AND THE VEHICLE FRAME RAIL. REFER TO THE VEHICLE
MANUFACTURER FOR PROPER JACKING INSTRUCTIONS.
FIGURE 3-1
SADDLE CONNECTION
A SADDLE ASSEMBLY IS ATTACHED TO THE CENTER BUSHING OF EACH EQUALIZING BEAM WITH TWO
(2) SADDLE CAPS. EACH SADDLE CAP USES TWO (2) BOLTS TO CLAMP THE CENTER BUSHING INNER
METAL TO THE SADDLE. EACH SADDLE CAP MUST BE INSTALLED SO THAT THERE IS AN EVEN GAP
BETWEEN THE SADDLE CAP AND THE BASE OF THE SADDLE LEGS AS SHOWN IN FIGURE 3-2.IF EACH
SADDLE CAP IS NOT INSTALLED EVENLY,THE SADDLE LEGS COULD BECOME DEFORMED, RESULTING
IN BENT BOLTS OR DAMAGED SADDLES.
FIGURE 3-2
Equalizing
Beam
Center Bushing
greaseDO NOT
Cross Tube
grease or
use as a jacking point
DO NOT
63K ShownULTIMAAX
17730-299 7
ULTIMAAX®for Fire and Rescue Vehicles
TORQUE ROD ASSEMBLY
THE ULTIMAAX SUSPENSION INCORPORATES LONGITUDINAL AND TRANSVERSE TORQUE RODS FOR
VEHICLE STABILITY. IF THESE COMPONENTS ARE DISCONNECTED OR ARE NON-FUNCTIONAL THE
VEHICLE SHOULD NOT BE OPERATED. FAILURETO DO SO CAN RESULT IN ADVERSE VEHICLE HANDLING
AND POSSIBLE TIRE CONTACT WITH THE FRAME OR THE SUSPENSION.
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 WARRANTY.
817730-299
ULTIMAAX®for Fire and Rescue Vehicles
SECTION 4
Special Tools
SADDLE TOOLS
DISASSEMBLY TOOL
Hendrickson Part No. 66086-113L
ASSEMBLY TOOL
Hendrickson Part No. 66086-108L
CENTER BUSHING TOOLS
RECEIVING TOOL
Hendrickson Part No. 66086-112
INSTALLATION TOOL
Hendrickson Part No. 66086-107
REMOVAL TOOL
Hendrickson Part No. 66086-110
BAR PIN STYLE END BUSHING TOOLS – 54K • 58K
RECEIVING TOOL
Hendrickson Part No. 66086-111
INSTALLATION TOOL
Hendrickson Part No. 66086-106
REMOVAL TOOL
Hendrickson Part No. 66086-109
ADAPTER STYLE END BUSHING TOOLS – 63K
End Bushing
Removal / Replacement Adapter
OTC Part Number 208350
Clamp
OTC Part Number 208349
Center Bushing
Removal / Replacement Adapter
OTC Part Number 28541
Not Needed for this publication
Hendrickson Part No. 66086-101
OTC Part No. 1763
Visit otctools.com
17730-299 9
ULTIMAAX®for Fire and Rescue Vehicles
TORQUE ROD BUSHING TOOLS
These shop made tools are made from cold rolled steel or equivalent.The drawings are
for reference only, Hendrickson does not supply these tools.
RECEIVING TOOL INSTALLATION / REMOVAL TOOL ULTRA ROD PLUS FUNNEL TOOL
Hendrickson Part No. 66086-000L
10 17730-299
ULTIMAAX®for Fire and Rescue Vehicles
SECTION 5
Parts List
■ 54K – Rosenbauer 9½" Ride Height • KME 10" Ride Height
■ 58K – Seagrave 9½", 10¼" and 11½" Ride Height
■ 63K – Rosenbauer 10½" Ride Height, KME 10" Ride Height
63K Beam End Conguration
1
2
11
17
17
13
15
16
18
19
10
21
23
12
20
26
25
27
24
22
24
23
22
16
16
13
15
16
14
(if equipped)
14 (if equipped)
9
8
76
3
4
5
6
Ce manuel convient aux modèles suivants
2
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