HJTECBllCAL
®PROCEDURE

. ,J'

HAULMAAX® Rear Suspension
SUBJECT: Service Instructions
LIT NO: 17730-244
DATE: October 2012
REVISION: E

lfJ:Jli1]i1]'''ihti
Section l

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

Section 2

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

Section 3

Important Safety Notice .............. 5

Section 4

Parts Lists . ......................... 8

Section 5

Special Tools ...................... 13

Section 6

Preventive Maintenance . ............ 14

Section 8

Component Replacement ........... 30
Fasteners .......................... 30
Outboard Frame Bracket ............... 30
Inboard Frame Bracket ................ 31
Saddle ............................ 32
Auxiliary Spring ...................... 35
Rebound Strap ...................... 35
Bolster Springs ...................... 36
Shock Absorbers (if equipped) .......... 39
Aftermarket Shock Absorber Kit .......... 40

Inspection Intervals ................... 14
Component Inspection ................ 15
Longitudinal and Transverse Torque Rods .. 16

Equalizing Beam ..................... 42
Bar Pin End Bushing .................. 47

Bolster Springs ...................... 17

Longitudinal Torque Rods ............... 49

Rebound Strap ...................... 18

Transverse Torque Rods ................ 50

Auxiliary Springs ..................... 18

Torque Rod Bushings ................. 51

Wear plate ......................... 19
Equalizing Beam End Connection ........ 19
Axle Bracket ........................ 21
Bar Pin End Bushing .................. 21
Bar Pin Shims ....................... 21

Section 9

Troubleshooting Guide . ............. 53

Section l O Torque Specifications ............... 54

Shock Absorber Inspection (if equipped) ... 22

Section 7

Alignment & Adjustments ........... 24
Auxiliary Spring Shim Evaluation ......... 24
Auxiliary Spring Shims Adjustment ........ 25
Drive Axle Alignment Inspection Procedure . 26
Lateral Alignment .................... 27
Bar Pin Alignment .................... 27
Bar Pin Alignment Shims ............... 29

(HlBEIDRICKSOI
746
Oh Us®
/#'&
spring contact plate, contact
Tightening Torque
~
plate spacers (if equipped) and
90-105 ft. lbs.
equalizing beam assembly, see
Figure 8-27. Install flange head locknuts and tighten to~ 90-105 foot pounds torque.

NOTE

FIGURE 8-27

For vehicles built or serviced ofter 11/07 - - - - - - - - For vehicles built prior to 11/07

W' Flange Bolt

W' Flange Nut

---~

W' Flange Bolt
W' Flange Nut

""-~~~~Auxiliary Spring Shims
Spring
Contact Plate

...-.~_--Auxiliary

27. Locate the shock absorber studs (if equipped) into the lower shock mounting brackets.
Install the rubber bushings, retainer washers and nylon locknuts. Tighten to IJI 70-90 foot
pounds torque.

A

CAUTION

Component Replacement

THE REBOUND STRAP MUST BE INSTALLED WITH THE SEWN AREA FACING AWAY FROM THE SADDLE AND
EQUALIZING BEAM. FAILURE TO DO SO WILL RESULT IN PREMATURE WEAR OF THE REBOUND STRAP.

46

17730-244

'H

HAULMAAX® Rear Suspension

l!!I

FIGURE 8~28

28. Slide the rebound clip through
the upper rebound strap loop, see
Figure 8-28.
29. From the inboard side of the saddle, mount the rebound clip by
installing fasteners. Tighten locknuts to ~ 90-105 foot pounds
torque.
30. Remove the wheel chocks.

BAR PIN END BUSHING
NOTE

Hendrickson bar pin service kits
containing alignment shims. (Kit No.
34013-088L) or (Rotating Bar Pin Bushing Kit No. 34013-188) contain all the components
required for one equalizing beam end, see Parts List Section of this publication.

YOU WILL NEED
•
•
•

A shop press with a capacity of at least l 00 tons.
Bar pin adapter set tool - Refer to Special Tools Section of this publication for the tools to
remove and install the bar pin style rubber end bushings.
Receiving tool - The receiving tool is a shop made tool which completely supports the
equalizing beam hub being serviced and is tall enough to receive the bushing as it is being
pressed in or out. see Special Tools Section of this publication.

A

WARNING

WHEN REMOVING AND INSTALLING BUSHINGS IN THE EQUALIZING BEAMS, FOLLOW THE
PROCEDURES OUTLINED IN THIS PUBLICATION. DO NOT USE A CUTTING TORCH TO REMOVE THE
BUSHING OUTER METALS PRESSED IN THE EQUALIZING BEAM BORES. WELDING. TORCHING OR
ATTACHING MATERIAL TO THE EQUALIZING BEAM MUST NEVER BE PERFORMED. THE USE OF HEAT
CAN ADVERSELY AFFECT THE STRENGTH OF THE EQUALIZING BEAMS AND CAN CAUSE DAMAGE TO
THE EQUALIZING BEAM ASSEMBLY, LOSS OF VEHICLE CONTROL AND POSSIBLE PERSONAL INJURY
OR PROPERTY DAMAGE.

A

WARNING

DISCARD USED FASTENERS.ALWAYS USE NEW FASTENERS TO COMPLETE A REPAIR. FAILURE TO
DO SO COULD RESULT IN FAILURE OF THE PART OR MATING PARTS, LOSS OF VEHICLE CONTROL
PERSONAL INJURY, OR PROPERTY DAMAGE.

NOTE

Hendrickson recommends the use of Grade 8 bolts and Grade C locknuts. If flange head bolts
and locknuts are not used then hardened structural washers must be used under bolt heads
and locknuts.

BAR PIN END BUSHING REMOVAL

NOTE

17730-244

Whenever an equalizing beam is removed for repair, or inspection of the equalizing beam
end connection reveals movement. measure the distance between the axle bracket legs for
correct width. Refer to Axle Bracket in Preventive Maintenance Section of this publication for
measurement location and dimensions. An axle bracket outside of the measurement range
must be repaired or replaced. Consult the vehicle manufacturer for inspection. component
repair and replacement instructions.
l . Remove equalizing beam assembly from vehicle as detailed in the equalizing beam disassembly instructions in this section.
2. Place the equalizing beam in the shop press with the equalizing beam end hub squarely
supported on the press bed or receiving tool.

47

Component Replacement

'H
l!!J

HAULMAAX® Rear Suspension
FIGURE 8-29

3.

4.

5.

Press on the end bushing inner metal, see Figure
8-29, of the end bushing until the inner metal is flush
with the top of the equalizing beam end hub. This will
dislodge the confinement washer and move the bushing rubber away from the outer metal of the bushing
so the push out tool can be installed, see Special Tools
Section of this publication.
Center the bushing push out tool directly on the bushing's outer metal and press the bushing out of the
equalizing beam end hub.
After removing the bar pin end bushings, thoroughly
inspect each end hub bore.

BAR PIN END BUSHING

Inner Metal
Confinement
Washer
Outer Metal

INSPECTION
After removing the bar pin end bushings, thoroughly inspect the equalizing beam bores. If the
equalizing beam is damaged from end bushing removal, replacement of the equalizing beam is
required, replace with a new equalizing beam. DO NOT re-bush or otherwise use an equalizing
beam that has been damaged.

A

WARNING

FAILURE TO REPLACE AN EQUALIZING BEAM THAT HAS BEEN DAMAGED FROM BUSHING REMOVAL
CAN RESULT IN THE FAILURE OF THAT EQUALIZING BEAM, LEADING TO LOSS OF VEHICLE CONTROL
AND POSSIBLE PERSONAL INJURY OR PROPERTY DAMAGE.
When installing bar pin end bushings the following steps will minimize the chance of damaging
a new bushing:
FIGURE 8-30

Equalizing Beam

1. Clean the end hub bores with emery cloth or
End Hub Bore Diameter
hone, removing any nicks or metal buildup
from bushing removal.
2. Measure the equalizing beam end hub . .;.;4..;_36.;..;9_"-f(-----------------------------------------------------

2
3

Saddle to Outboard Frame Bracket

20

Inboard Frame Bracket to Outboard Frame Bracket
and Cross Member

12

Saddle to Auxiliary Spring Bracket

6

-------

M20 x 2.5" 6H Locknut

280-340

5/s"-11 UNC Locknut

190-210

•

*M 16 Locknut
W'-13 UNC Flange Locknut

90-105

·-- --------------------------·------------------------- -------r--------------------·---------------- ----------------

4

Auxiliary Spring Bracket to Rebound Clip

4

W'-13 UNC Flange Locknut

90-105

5

Inboard Saddle Bolts

4

W'-13 UNC Flange Locknut

90-105

--------------------------------------- ----------- ------- ----------------------------------- ---------------

6

Saddle to Bolster Spring

16

W'-13 UNC Flange Locknut

7

Bolster Spring Tie-Bar

4

W'-13 UNC Flange Locknut

90-105
90-105
------

Auxiliary Spring Contact Plate to Rebound Strap

8

2

%"-16 UNF Locknut

45-55
-------

Auxiliary Spring Contact Plate to Auxiliary Spring Shim

9
10

4

Auxiliary Spring Contact Plate to Beam Assembly

8

---------------------Bolster Spring to Beam Assembly
--------------------Upper Shock Absorber to Upper Shock Bracket

11
12

15
16
17

90-105
----

90-105

16

W'-13 UNC Flange Locknut

90-105

4

5/s"-11 UNC Locknut

150-170

----------

4

5/s"-11 UNC Locknut

------------ --------------------------------

Bar pin Attachment to Axle - Bolt Head
--------------------------------------------------------

---------------

90-105
-----

***W'-13 UNC Flange Locknut

-------~---------~-------

Lower Shock Absorber to Beam - Nylocknut
13
-- ----------------------------------------------------------14
Bar pin Attachment to Axle - Locknut

W'-13 UNC Flange Locknut
-------**5/s"-Dacromet XL Flange Locknut

8

l "-8 UNC Locknut

8

l "-8 UNC Hex Bolt

----·------,-~---------------------------·-----~-

Transverse Torque Rod to Axle - Locknut

2

Transverse Torque Rod to Axle - Bolt Head

2

--'-----------------·-·------------------------ ·-------

70-90
-------------------------- --

450-600
500-650
-----------------

1W'-12 UNF Locknuts

175-225

5/s"-11 UNC 1.25" Bolt

60-70

---~--------------------·-·-----~

Torque values listed above apply only if Hendrickson supplied fasteners are used. If non Hendrickson fasteners are used, follow
torque specification listed in vehicle manufacturer's service manual.
* Not supplied by Hendrickson. For torque requirements see vehicle manufacturer.
** Applies to vehicles built or serviced after 11 /07.
*** Applies to vehicles built prior to 11/07.
---------------------------------------------------------------

NOTE:

17730-244

55

Torque Specifications

""'

www.hendrickson-intl.com

tHJHENDRICKSON
®

Truck Commercial Vehicle Systems
800 South Frontage Road
Woodridge. IL 60517-4904 USA

17730-244RevE10-12

l .866. 755.5968 (Tall-free U.S. and Canada)
l.630.910.2800 (Outside U.S. and Canada)
Fax l .630.910.2899

Information contained in this literature was accurate at the time of publication. Product changes may have been made after the copyright date that are not reflected.
© 2002 - 2012 Hendrickson USA, L.l.C. All Rights Reserved

Printed in United States of America