HJ ASSEMBLY
®
INSTRUCTIONS
HAULMAAX® Rear Suspension
Load Spring Service Kit for
Vehicle Weight Bias
SUBJECT: Kit No. 60961-7 46
LIT NO: 59310-047
REVISION: B
DATE: September 2014

This publication is intended to assist maintenance
personnel with the installation of the load springs for
HAULMAAX® equipped vehicles with a weight bias .
Hendrickson's progressive load spring (Service Kit
No. 60961-7 46) is available for HAULMAAX 400/460
suspensions, see Figure 1.
Refer to Hendrickson Publication No. l 77 30-244
for complete service and safety instructions for the
HAULMAAX rear suspension.
FIGURE 1
PROGRESSIVE Load Spring

This load spring for weight bias service kit is:
•

•
•
AUXILIARY Load Spring

HAULMAAX load Spring
Weight Bias Service Kit
No. 60961·746

DESCRIPTION

Q~. j

Progressive Load Spring
Auxiliary Load Spring
Load Spring Shim

2

%" 13 UNC Flange Bolt

10

W' 13 UNC Flange Nut

10

intended to help adjust for vehicle lean conditions that may be induced by a side-to-side
vehicle weight bias that is found with particular types of vehicle bodies or vehicle-mounted equipment used in certain applications (including, but not limited to, side-loading
refuse and well driller).
not intended to address vehicle lean conditions caused by worn or damaged vehicle
components, such as: twisted frames or worn body mounts.
not intended for vehicle lean conditions that can be eliminated by re-distributing vehicle
cargo or other loads. Prior to purchasing or insta lling a load spring for weight bias
service kit, first re-distribute any such loads that may be causing a side-to-side vehicle
weight bias.

INSPECTION
Prior to the weight bias load spring installation, visually inspect the vehicle for worn or damaged components and repair or replace as necessary.

VEHICLE LEAN EVALUATION
1. Place the vehicle on a level floor.
2. Chock the wheels.
3. Measure the distance from the bottom of the frame to the ground on both sides of the
vehicle just ahead of the tandem.
4. Determine if the vehicle fulfills the weight bias criteria. If the frame to ground measurements:
a. ore within the vehicle manufacturer's level chassis specification, do not install the load
spring for weight bias service kit. Remove wheel chocks.
b. ore not within the vehicle manufacturer's level chassis specification. then the lood
spring for weight bias service kit can be installed on the vehicle.

[ffiHENDRICKSON

pfe p/07,HRams Oh t/s®

HAULMAAX® Progressive Load Spring
WEIGHT BIAS LOAD SPRING KIT INSTALLATION
NOTE

If equipped with a progressive load spring on the heavy side or auxiliary load spring on the light
side and in acceptable condition (3" in height with the vehicle un-looded), it is acceptable lo
eliminate the load spring replacement procedure for that side and install the replacement load
spring on the opposite side of the tandem as needed for the weight bias configuration.

SERVICE HINT

Tire removal is not necessary for the replacement of the load spring assembly.

NOTE

Install the progressive load spring on the low (heavy) side of the vehicle and the auxil iary load
spring on the high (light) side.
FIGURE 2

DISASSEMBLY

A

WARNING

1. Chock the wheels.
THE VEHICLE MUST BE FIRMLY
SUPPORTED WITH JACK STANDS PRIOR
TO SERVICING. FAILURE TO DO SO
CAN RESULT IN PERSONAL INJURY OR
PROPERTY DAMAGE .
2.

Remove the three (3) W' flange
load spring mounting fasteners.

3.

Remove the load spring spacer
on both sides of the vehicle, see
Figure 2.
Raise the frame of the vehicle until
there is sufficient gap between the
load spring and the load spring
shims. Support the frame at this
height, see Figure 3.

4.

FIGURE 3

5. Remove and discord the
springs from both sides
of the vehicle and , see
Figure 2.
6. Remove the load spring
sh im fasteners and sh ims.
unless equipped with two
(2) load spring sh im s in
condition ore installed. then
proceed to assembly.

Progressive
Load Spring

u~~~fl~~~T Raise the frome until there
is sufficient gap between
the load spring and the
load spring shims.

J;l

Load Spring Shims

ASSEMBLY

A

WARNING

THE HAULMAAX SUSPENSION MUST HAVE A MINIMUMOF ONE (l ) LOAD SPRING SHIM PER SIDE OF
THE VEHICLE.
1. Install two (2) load spring shims per side and W' fasteners. see Figure 3.
2. Install the progressive load spring on the load spring bracket to the low (heavy) side of the
vehicle. see Figure 4.

2

59310-047

HAULMAAX® Progressive Load Spring
FIGURE 4

3. Position the load spring
bracket and install the W' load
spring mounting fasteners.
Ensure the load spring spacer
is installed on the outboard
fastener between the load
spring bracket and the sadd le
assembly.
4. Install the new auxiliary load
spring on the spring bracket
to the high (light) side of the
vehicle, see Figure 4.
5. Position the load spring
bracket and install the W' load
spring mounting fasteners .
-....:.
Ensure the load spring spacer
is installed on the outboard Auxiliary Load
fastene r between the load Spring
spring bracket and the saddle high (light side)
assembly.
6. Tighten all load spring and shim W' mounting fasteners to IJJ 90-105 foot pounds.
7. Remove the frame supports and lower the vehicle.

63

RE-EVALUATE VEHICLE LEAN
NOTE

A minimum of one (l ) load spring shim per side is required. Shim count must not vary from side
to side of the vehicle by more than (2) shims.

l . Chock the vehicle (disregard if chocks are already in place) .
2. Measure the distance from the bottom of frame to ground on both sides of the vehicle just
ahead of the tandem .
3. If the frame to ground measurements:
a. are within the vehicle monufacture's specification for a level chassis, then no further
adjustment is needed and wheel chocks can be removed.
b. are not within the vehicle manufacturer's specifications for a level chassis then the
load spring shims may be adjusted, proceed to the Shim Count Adjustment procedure.
FIGURE 5

SHIM COUNT ADJUSTMENT
NOTE

Additional load spring shims may be added
to the low side, or load spring shims may be
removed from the high side. The amount of
shims per side must be within two (2) shims
from side to side.

EXAMPLE:

If there ore two (2) load spring shims on the
left side of the vehicle then the right side may
hove as many as four (4) load spring shims or
as few as one (l ) load spring shim.
1. Raise and support the frame.

59310-047

3

Load Spring
Contact Plate

Yi'' Flange Nut
Tightening Torque
90-105 fl. lbs.

HAULMAAX® Progressive Load Spring
2. Remove the fasteners that attach the load spring shims to the load spring contact plate,
see Figure 5.
3. Remove o load spring shim from the light (high) side of the vehicle, or install on additional
load spring shim to the heavy (low) side as needed. A minimum of one (l ) load spring
shim per side is required. Shim count must not vary from side lo side of the vehicle by more
than (2) shims.

NOTE

The required boll length varies with the amount of shims installed. Ensure there ore at least three
(3) threads exposed post the locknut.
4. Install the fasteners that attach the load spring shims to the load spring contact plate and
tighten to ~ 90-105 foot pounds torque, see Figure 5.
5. Return to Re-Evaluate Vehicle Leon until measurement is within specification .
6. Remove wheel chocks.

Refer any questions on this publication to Hendrickson Tech Services
Ports Identification
truc~ports@hend rickson-intl.com

Toll-free U.S. ond Conodo

l .866.755.5968
Outside U.S. ond Conodo

Technical Support
techservices@hendrickson-intl.com

1.630.910.2800

Additional Hendrickson
Product lnformo1ion
www.hendrickson-intl.com

l .630.910.2899

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~HENDRICKSON
Truck Commerc1ol Velucle Systems

800 Soulh Fronloge Rood
Woodridge. I. 60517·4904 USA

1 866 755 5968 (lolHree US and Conodo)
1630910 2800 (Ouls1de US ond Conodo)
Fox 1 630 910 2899

lntofmolion conla:oed ri this I k!falurt wos OCCUl'afe al Ile time of p.1bhco1ion Product changes may hcwe beE.Yl mode otter lie C()J¥ight do1o flol ore no! r~.

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