[ff TECHNICAL

~PROCEDURE
Freightliner Vehicles equipped
with AIRTEK®Suspension System
SUBJECT: Rear Shackle Bracket and Front/Rear
Spring Eye Connections: Pre-delivery
Inspection and Preventive Maintenance
LIT NO: 17730-236
REVISION : B
DATE: December 2013

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INTRODUCTION
This publication primarily focuses on proper pre-delivery inspection and preventive maintenance of
rear shackle bracket and front and rear spring eye components of AIRTEK9 suspension systems as
installed on applicable Freightliner vehicles built otter May 2010. This information is intended as a
supplement to Hendrickson Technical Procedure Literature No. 17730-243.
Following appropriate inspection and preventive maintenance procedures is important to help ensure
the proper service and operation of the AIRTEK system. Hendrickson recommends the AIRTEK system
is inspected at pre-delivery. the first 1.000 miles of service. and at the regular preventive maintenance
intervals.
Carefully inspect the AIRTEK rear shackle brackets and front/rear spring eye connections using the following instructions. refer to Hendrickson Literature No. 17730-243 for complete AIRTEK suspension
inspection procedures. important safety notices. and preventive maintenance details. available at
www. hendrickson-intl .com.

NOTE

Torque values shown in this publication apply only if Hendrickson supplied fasteners ore used. If non
Hendrickson fasteners ore used. follow the torque specificotion listed in the vehicle manufacturer's
service manual.

SAFETY REMINDER
All applicable 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 damage the
vehicle. cause personal injury. render the vehicle unsafe in operation. or void manufacturer's warranty.
Failure to follow the applicable safety precautions con result in personal injury and/or property damage. Carefully read and understand all safety related information within the applicable Hendrickson
publications. on all decals and those materials provided by the vehicle manufacturer before operating the vehicle. or conducting any maintenance. service or repair.

HENDRICKSON RECOMMENDED PREVENTIVE MAINTENANCE INTERVALS
PRE-DELIVERY INSPECTION - First l 00 Miles/150 kilometers or prior to vehicle in-service
a. Visually inspect the suspension for proper assembly.
b. Visually inspect the overall condition of the rear shackle brackets. shackle plates. and front/rear
spring eye connections. front axle, leaf springs, and top pods for any damage.
c. Check all fasteners for proper torque with special attention to the following suspension connections: rear shackle bracket connections. front/rear spring eye connections. and clomp group

~HENDRICKSON
~ Hf»H.;{=>~ CbUs•

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AIRTEK®Suspension System for Freightliner Vehicles

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mounting hordwore. Use a calibrated torque wrench and a wrench to hold the fastener, check
torque in a tightening direction.
d. Verify the ride height is within specification by using ride height gauge 457 45-159, for more
details refer to the Alignment and Adjustment Section. Hendrickson Literature No. 17730-243.
INSPECTION - First 1,000 miles /l ,600 kilometers of pre-delivery or suspension service
a. Visually inspect suspension components. Check for:
• Proper suspension function
• Signs of unusual movement, or loose or missing components
• Signs of abrasive or adverse contact between components
• Damaged, bent or cracked parts
b. Check all fasteners for proper torque with special attention to the following suspension connections: rear shackle bracket connections, front/rear spring eye connections, and clamp group
mounting hardware. Use a calibrated torque wrench and a wrench to hold the fastener, check
torque in a tightening direction.
PREVENTIVE MAINTENANCE - On-highway, visual inspection; every 50,000 miles (80,000 km) or
six (6) months, whichever comes first. On-highway Physica l Inspection every year or l 00,000 miles
(160,934 km), whichever comes first.
a. Visual inspection. check suspension components for:
• Proper suspension function
• Signs of unusual movement, or loose or missing components
• Signs of abrasive or adverse contact between components
• Damaged, bent or cracked parts
b. Physical inspection, check all fasteners for proper torque value with special attention to rear
shackle bracket and front/rear spring eye connections. Use a calibrated torque wrench and a
wrench to hold the fastener, check torque in a tightening direction.

SHACKLE BRACKET & FRONT/REAR SPRING EYE CONNECTION
VISUAL INSPECTION
In normal use these components will function satisfactorily, even though the components may show
some wear.
Some signs of a loose or worn connection that can result in component damage may include the
following, also see Figure l . If any of the below are present. then a Torque Inspection is necessary.
• The vehicle exhi bits a popping or clu nking
sound when turning.
• Excessive lateral movement of the leaf spring.

• The rear spring eye is in contact with the
shackle plates.

TORQUE INSPECTION

A

WARNING

LOOSE OR OVER TORQUED FASTENERS CAN CAUSE COMPONENT DAMAGE, LOSS OF VEHICLE CONTROL
PROPERTY DAMAGE. OR SEVERE PERSONAL INJURY. MAINTAIN CORRECT TORQUE VALUES ATALL TIMES.
CHECK TORQUEVALUES ON A REGULAR BASIS AS SPECIFIED.
l . Chock the wheels.
2. Verify the ride height is within specification by using Ride Height Gauge 457 45-1 59, for more
details refer to the Alignment and Adjustment Section. Hendrickson Literature No. 17730-243.

2

17730·236

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AIRTEK®Suspension System for Freightliner Vehicles

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NOTE

Any adjustment of the ride height will still require a loosening and re-torque of the two (2) spring eye
fasteners and the four (4) rear shackle bracket fasteners at the corrected ride height. regardless of
prevailing torque.
3.

If ride height is out of specification. adjust the ride height to the correct specification; refer to
Ride Height Adjustment in the Alignment and Adjustment Section of Hendrickson Literature No.
17730-243.Any adjustment of the ride height will still require a loosening and re-torque of the
two (2) spring eye fasteners and the four (4) rear shackle bracket fasteners at the corrected ride
height. regardless of prevailing torque, see Steps 7-9 .

4. Check prevailing torque load at the two (2) front spring eye fasteners and four (4) rear shackle
bracket fastener locations.
5. Set the torque wrench to ~ 200 foot pounds and check the torque at all six locations as shown
in Figure 1. Use a calibrated torque wrench and a wrench to hold the fastener. check torque in
a tightening direction.
• If no locknut movement is observed, set the torque wrench to 250 foot pound and repeat until
proper torque value is achieved. If proper torque is achieved, no further action is necessary.
• If locknut movement is observed. torque value was below 200 foot pounds, proceed to Step 6.
FIGURE 1

Freightliner vehicles built AFTER May 2010

6. See the appropriate action below:
• If the torque value is below 200 foot pounds, disassemble the shackle/spring eye joint and remove and discard
fasteners. Inspect all mating components for wear or damage, replace as necessary, see Physical Inspection in this
publication.

*3f.I" Spring Eye Fastener
Tighten to 250 ft. lbs.

NOTE: *Spring eye bolts must be inserted outboard to inboard
side due to component interference.

• If a ride height adjustment was performed, re-torque is
necessary, see Steps 7-9.
7. With the truck at the correct ride height, loosen the two
(2) spring eye fasteners and four ( 4) rear shackle bracket
fasteners, see Figure 2.

FIGURE 2

17730-236

3

8.

With the truck at the correct
ride height. tighten all six (6)
fasteners to~ 250 foot pounds
of torque.

9.

Remove the wheel chocks.

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AIRTEK® Suspension System for Freightliner Vehicles
PHYSICAL INSPECTION
FIGURE 3

1. Chock the wheels.

UNACCEPTABLE WEAR
Shackle Bracket
Loose Joint
Elongated Hole

2. Remove fasteners from the
spring eye connect ion(s).
Discard fasteners.
3.

Inspect the hanger, shackle
plate, shackle bracket and
mating components, if any of
the components exhibit any
signs of damage or excessive
wear, the component and/or
mating components require
replocement,also see Figures
3 and 4. Refer to Hendrickson
Literature No. 17730-243 for
component replacement.

Front Spring Eye
Loose Joint
Worn Bushing Inner Metal
due lo low clomp load
FIGURE 4

4. When component replacement is complete with new
fasterners and the truck is at
the correct ride height. tighten
all six (6) fasteners to ~ 250
foot pounds of torque.
5. Remove the wheel chocks.

6. If components replacement
was performed, fo llow initial 1,000 mile inspection
procedure and preventive
maintenance.

Inner Metal Connection
Acceptable: No wear or slippage
al inner melol connection
Acceptable
wear

Refer any questions on this publication to Hendrickson Tech Services:
Ports Identification
truckports@hendrickson-intl.com

Toll-free U.S. and Canada

1.866. 755.5968

Technical Support
techservices@hendrickson-intl.com

Outside U.S. and Canada

1.630.910.2800

Additional Hendrickson
Product Information
www.hendrickson-intl.com

1.630.910.2899

- - - - - - - - - - - - - - - - www.hendrickson-intl.com - - - - - - - - - - - - - - - -

~HENDRICKSON
Truck Commerclol Vehicle Syslems
800 Soulh Fronloge Rood
Woodridge. IL 60517·4904 USA

1 866.755.5968 (Toll-tree U.S. ond Conodo)
630 910 2800 (Outside U.S ond Conodo)
Fox 1.630 910.2899

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