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Page 1: Page 1 · PDF filePeterbilt - Air Leaf 52 Peterbilt - Air Trac 53 Peterbilt - Low Mount Air Leaf 56 Peterbilt - New Low Air ... zeroes out the bushing to proper ride height

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Page 2: Page 1 · PDF filePeterbilt - Air Leaf 52 Peterbilt - Air Trac 53 Peterbilt - Low Mount Air Leaf 56 Peterbilt - New Low Air ... zeroes out the bushing to proper ride height

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ContentSuspensions 2AirSuspensionInspection/Maintenance 3LeafSpringInspection 4MostCommon&PreventableFailures 5TorqueRods 6ATROFreeRotationDesign 11ATROTorqueRodInformationCharts 12Chalmers-800Series 14Freightliner-FASII 16Hendrickson-Haulmaax 18Hendrickson-HN 22Hendrickson-Intraax/Vantraax 26Hendrickson-Primaax 30Hendrickson-RS 34Hendrickson-RT 36Hutch-H/CH7700/9700 38International-CorpAir/IROS 40International-ZAirSpring 42Kenworth-AirGlide100 44Kenworth-AirGlide200/400 46Kenworth-AirGlide380/Peterbilt-FlexAir 48Mack-Camelback 50Peterbilt-AirLeaf 52Peterbilt-AirTrac 53Peterbilt-LowMountAirLeaf 56Peterbilt-NewLowAirLeaf 58HighTemperatureUnderhoodMounts 60SuspensionsAtAGlance 62

KEY�� Benefit Tech�Tip�► Wear�Item

Copyright©2014byATROEngineeredSystems,Inc.ALLRIGHTSRESERVED.ThisbookcontainsmaterialprotectedunderInternationalandFederalCopyrightLawsandTreaties.Anyunauthorizedreprintoruseofthismaterialisprohibited.Nopartofthisbookmaybereproducedortransmittedinanyformorbyanymeans,electronicormechanical,includingphotocopying,recording,orbyanyinformationstorageandretrievalsystemwithoutexpresswrittenpermissionfromATROEngineeredSystems,Inc.

ATROisnotliableforanyerrorsherein.Allmanufacturers’namesandpartnumbersusedaretrademarkedbytherespectivemanufacturer.Thesenamesandpartnumbersarebeingusedwithoutpermission.Noendorsement,affiliationorrecommendationisimplied.Theyareincludedforreferencepurposesonly.SomeproductsshownherearecoveredbyCanadianPatent1,327,979;AustralianPatent630,358.

Page 3: Page 1 · PDF filePeterbilt - Air Leaf 52 Peterbilt - Air Trac 53 Peterbilt - Low Mount Air Leaf 56 Peterbilt - New Low Air ... zeroes out the bushing to proper ride height

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Suspensions•� A�suspension�is�a�SYSTEM�that�relies�on�all�the�components�

working�in�harmony�to�perform�their�given�function.

•� When�one�part�gets�worn�the�rate�of�stress�transfer�to�other�parts�accelerates,�so�early�detection�of�any�wear�will�save�big�$$�for�the�truck�owner.

Suspensions are designed to:

•� Carry�the�load

•� Provide�stability�against�side�sway

•� Transfer�driving�&�braking�forces�between�frame�and�axles

•� Resist�drive�&�brake�torque�wind-up

•� Produce�suitable�riding�and�cushioning�properties

•� Maintain�axle�alignment�parallel�to�each�other�and�perpendicular�to�the�frame

•� Provide�minimum�changes�in�drive�axle�pinion�angles�and�slip�joint�movement

•� Minimize�load�transfer�between�axles�on�tandems

•� Provide�sufficient�vertical�movement�on�tandems�to�maintain�traction

Components making up the suspension system include:

•� Leaf�springs

•� Air�Springs

•� Torque�rods

•� Bushings

•� Spring�Pins/Shackle�kits

•� U-bolts

•� Shocks

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Air Suspension Inspection/Maintenance

1.)� Check�for�leaking�air,�or�restricted�air�flow

a.)� if�both�sides�flat,�there�may�be�a�leak�between�the�air�brake�system�and�the�suspension�air�system.

b.)� if�flat�on�one�side,�there�may�be�a�leak�between�the�height�control�valve�and�the�air�spring.

2.)� Check�automatic�height�control�valve�–�test�it:�disconnect�linkage�and�move�actuating�arm�up�and�down�to�see�if�air�bag�inflates/deflates.

3.)� Check�bushings�–�place�pry�bar�between�trailing�arm�and�hanger�and�check�for�movement.��Abnormal�tire�wear�is�a�good�indicator�of�bushing�wear.

4.)� Check�shocks�–�should�be�warm�to�the�touch�after�vehicle�operation.

a.)� if�cold,�the�shock�is�not�functioning�properly�and�should�be�replaced.�

b.)� If�shock�can�be�easily�compressed�after�removal,�shock�should�be�replaced.

c.)� Also,�check�for�shock�bushing�wear.

5.)� Check�for�under-inflation�–�slight�positive�pressure�maintains�shape�of�airbag�and�prevents�folding/pinching.

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Air Suspension Inspection/Maintenance

6.)��Causes�of�Air�Spring�Failure:

a.)� Overextension

b.)� Abrasion

c.)� Contamination

d.)� Suspension�Misalignment

e.)� Road�Hazards

f.)� Fatigue�/�Old�Age

Leaf Spring Inspection

Check:

•� Spring�leaves

•� Center�bolt

•� U-bolt�nuts�for�tightness

•� Spring�clips

•� Spring�eyes�(cracks,�motion,�lubrication)

•� Front�suspension�spring�shackle�bolts

•� Torque�rods�and�all�other�related�parts�of�spring�suspensions:�Hangers,�equalizers,�beam�bushings

•� Shock�absorbers

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Most Common & Preventable Failures99 U-BOLTS

Never re-use U-bolts!!!!Check they are the proper gradeEnsure properly aligned (check condition of top plate and saddle alignment holes)Allow suspension to settle, retorque while under load.Torque U-bolts per spec – re-torque at 500 miles and check periodically

99 SPRINGSProper U-bolt maintenance will increase spring life but springs will fatigue and wear. Check for fatigue cracks.One overlooked factor in spring longevity is brake balance. One badly adjusted brake makes the other brakes overcompensate and the spring at those axle ends will get “wound up” more than if all pulling equally.

99 TORQUE9ROD9NEGLECTThis affects spring life, bushings, brackets, bolsters, shocks, air bags and other suspension hardware. Check for failure periodically – especially transverse rods!

99 LUBRICATION9FAILURESWear is accelerated; wear patterns are exaggerated; inhibits normal free movement, resulting in part breakage.

99 BUSHING9FAILURESWaiting to replace worn bushings until after they’ve created a secondary, more expensive problem.

99 SHOCK9ABSORBER9NEGLECTThis affects spring life, bushings and other suspension hardware not to mention additional strain and vibration on radiators, electrical systems, cabs and tires. Defective shocks can also contribute to air bag failure.

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Torque Rods

Purpose of a torque rod:

•� Restrain�rotation�of�the�axle�housing�during�acceleration�and�braking�

•� Locate�the�axle�and�maintain�alignment�

•� Control�driveline�angle�

•� Absorb�leaning�and�cornering�forces

Key technical point:

Transverse�rods�must�be�perpendicular�to�the�frame�rail�when�installed.��If�not�installed�properly:

•� The�inner�pin�could�break

•� The�torque�rod�could�break

•� The�bushing�could�walk�out�of�the�rod

•� Warranty�may�be�void

When should rods be rebushed or replaced?

•� Bent�torque�rod

•� More�than�1/8”�movement�at�the�rod�eye.���Can�check�by�hand�or�by�prying�against�end�with�a�bar

•� Bushing�material�is�torn�or�cracked

•� Pin�or�sleeve�in�the�rod�eye�is�off-center�(pin�appears�to�be�“walking�out”�of�rod�eye)

•� Pin/sleeve�is�no�longer�located�in�the�vertical�center�of�the�rod�eye

•� Bolt�hole�in�straddle�pins�is�stretched,�elongated

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Restrain�axle�rotation Locate�axle,��maintain�alignment

Control�driveline�angle Absorb�leaning,��cornering�forces

Bushing�material�is�torn�or�cracked

Bushing�“walk�out”

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ATRO’s Current Torque Rod Options1.)� OE�direct�replacement�torque�rods:�

a.)� Standard�Eye

b.)� Small�Eye

2.)� 2-piece�torque�rods

3.)� Custom

1.) OE direct replacement torque rods, standard eye & small eye

OE�replacement�rods-OE�has�dedicated�part�numbers�for�a�specific�make/model�Example�–�any�KW�AG400�uses�a�19�¾”�straddle/straddle�torque�rod.��ATRO�offers�the�TR59-41474.�

a.)� ATRO�–�1�½”�shaft,�forged�eyes,�holds�2�¾”�OD-sized�bushings�-�TS38000,�TT38000,�TM38000.�(“standard�eye”)��

b.)� ATRO�–�1�½”�shaft,�forged�eyes,�holds�ATRO’s�2”�sleeved�bushings�ONLY�-�TS00-22500�&�TH00-22500.��(“small�eye”)

2.) Weld-to-length torque rods

Two-piece�design,�polyurethane,�rebushable,�available�as�empty�male/female�cores�also.��Welded�to�finished�length�by�distributor�or�fleet.

3.) Custom torque rods

Customer�specs�the�center-to-center�length,�bushing�configuration;�assembled�at�factory�and�shipped�finished�to�customer.

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Page 11: Page 1 · PDF filePeterbilt - Air Leaf 52 Peterbilt - Air Trac 53 Peterbilt - Low Mount Air Leaf 56 Peterbilt - New Low Air ... zeroes out the bushing to proper ride height

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BUSHING BUSHING USED ANGLE INSTALLEDCODE Left Right Left Right00 Straddle Straddle 0° 0°01 Straddle Straddle 0° 10°02 Straddle Straddle 10° 0°03 Straddle Straddle 0° 15°04 Straddle Straddle 0° 30°05 Straddle Straddle 20° 20°

OEM’s torque rod part numbering system

Bonded�bushings�have�multiple�part�numbers�for�the�same�torque�rods�to�allow�for�bushing�angle.��ATRO’s�free-rotation�design�

eliminates�this�excess�inventory.

ATRO BUSHING USED ANGLE INSTALLEDPART NO. Left Right Left RightTR00-41009 Straddle Straddle N/A N/ATR46-41175 Straddle Straddle N/A N/ATR59-41008 Straddle Straddle N/A N/ATR62-41243 Straddle Straddle N/A N/ATR75-41059 Straddle Straddle N/A N/A

ATRO’s�free-rotation�design�allows�the�bushing�to�swivel�360°�eliminating�angle�problems�and�simplifying�installation.

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ATRO’s Free-Rotation Design

� Reduces inventory levels and simplifies installation:

•� No�need�to�mark�the�old�bushing�position

•� No�struggle�to�line�up�the�bolt�holes

•� Installs�properly�the�first�time,�every�time

•� No�duplicate�inventory�for�identical�rods�with�different�bushing�angles

� Zeroes out to ride height:

ATRO’s design eliminates�“bushing�wind�up”�and�automatically�zeroes�out�the�bushing�to�proper�ride�height.��This�prevents�unnecessary�stresses�from�being�introduced�into�the�suspension.��Please�visit�www.atrobushing.com�to�see�the�ATRO�video�on�ride�height.

Page 13: Page 1 · PDF filePeterbilt - Air Leaf 52 Peterbilt - Air Trac 53 Peterbilt - Low Mount Air Leaf 56 Peterbilt - New Low Air ... zeroes out the bushing to proper ride height

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Bra

ndC

onfig

urat

ion

Max

Len

gth

Bus

hing

sEm

pty

Cor

e O

ptio

n

ATR

O2-piece

27”

Standard

Yes

Ultr

a R

od P

lus

2-piece

27”�or�35”

Standard

Yes

Ultr

a R

od

2-piece

27”�or�35”

Jam�(P

L1146)

No

O&

S3-piece

27”�or�35”

Non-rebushable

No

Torq

ue R

od B

rand

Mfr

’s B

ushi

ngs

Reb

ush

w/ A

TRO

ATR

O s

td. e

yeTS

38000,�TT38000,�TM38000,�etc.

TS38000,�TT38000,�TM38000…

ATR

O s

mal

l eye

TS00-22500,�TH00-22500�only

TS00-22500,�TH00-22500�only

Ultr

aRod

Plu

sConventional,�“Bonded”,�X

TRB

TS38000,�TT38000,�TM38000…

Ultr

aRod

Sleeveless�rubber�jam�bushings

PL1146,�T*50-xxxxx��(below

*)

Non

-reb

usha

ble

Non-replaceable�

Non-replaceable

OE

tubu

lar,

1 7/

8” e

yeSleeveless�rubber�jam�bushings

PL1146,�T*50-xxxxx��(below

*)

WEL

D T

O L

ENG

TH C

OM

PAR

ISO

N

ATR

O R

EBU

SH S

ELEC

TOR

*�See�“A

TRO�Torque�Rod�Bushing�Chart”�below

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ATR

O p

/nTy

peR

otat

esR

epla

ces

Not

es

PL11

46Straddle

No

OE�tubular,�UltraR

od5/8”�bolt�holes,�

straight�body

Original�design,��

no�outer�sleeve

TS00

-225

00Straddle

Yes

ATRO�only

Has�outer�sleeve

*TS5

0-22

691

Straddle

No

OE�tubular,�UltraR

od5/8”�bolt�holes,�

wings�anti-w

alk

Preferred�over�

PL1146,�no�outer

*TS5

0-22

210

Straddle

No

OE�tubular,�UltraR

od¾”�bolt�holes,�

Prim

aax/Firemaax,�

No�outer�sleeve

*TT5

0-22

697

Taper

No

OE�tubular,�UltraR

od1�¼”�threads,��

8”�OAL

No�outer�sleeve

*TT5

0-22

809

Taper

No

OE�tubular,�UltraR

od1�1/8”�threads,��

6�5/8”�OAL

Prim

aax/Firemaax,�

No�outer�sleeve

*TH

50-2

2692

Hollow

No

OE�tubular,�UltraR

od7/8”�bolt�hole

Prim

aax/Firemaax,�

no�outer�sleeve

TH00

-225

00Hollow

Yes

ATRO�only

7/8”�bolt�hole

Has�outer�sleeve

ATR

O T

OR

QU

E R

OD

BU

SHIN

G C

HA

RT

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Chalmers 800 SeriesATRO�load�spring,�LP19-24002•� Resistant�to�chemicals�(lime,�corrosive�solvents,�road�wash)•� Better�load�handling�and�ride�characteristics�than�OE�rubber�

and�other�polyurethane�brands.

ATRO�torque�rod�bushing�options:•� 2-piece�design�–�32/suspension�(PL1046,�PL1047)•� 1-piece�design�–�16/suspension�(TH19-22010,�TH19-22128)•� Oversized�options�–�PL1049�(2-piece);�TH19-22129�(1-piece)

Tech tip: �Change�one�rod�at�a�time!

► Wear items:�– Load�spring�– Torque�rod�bushings

PL1026ShockBushing

LP19-24002LoadSpring

PL1046Torque�RodBushing

PL1047Torque�RodBushing

TH19-22010Torque�RodBushing

PL1049Torque�RodBushing�

(oversized)

TH19-22128Torque�RodBushing

TH19-22129Torque�RodBushing

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Freightliner FAS IIThe�biggest�concern�with�bonded�bushings�is�the�spring�eye�opens�up�and�the�bushing�can�walk�out:��

�▪ With�a�bonded�OE-style�rubber�bushing,�the�pin�is�not�allowed�to�rotate,�so�the�ENTIRE�bushing�can�be�forced�to�spin�within�the�eye�of�the�spring�thus�leading�to�the�wallowed�out�spring�eye.��Bonded�rubber�bushings�attempt�to�combat�this�with�an�inboard�flanged�end�encased�in�a�ring�with�detents�for�“gripping”�the�edge�of�the�spring’s�eye.

�▪ With�ATRO’s�rotating�bushing,�the�outer�sleeve�and�urethane�rotate�around�the�fixed�pin.

ATRO design:

�▪ Outer�sleeved�is�flanged�to�limit�lateral�travel

�▪ Inner�pin�rotates�rather�than�entire�bushing�spinning

ATRO torque rod:

�▪ one�of�three�torque�rod�length�options:��OE�direct�replacement�rods�TR46-41716,�TR46-41316�or�TR46-41002.��The�bushing�in�these�rods�is�a�TS00-22500�–�it�will�not�fit�OEM�or�other�aftermarket�rods.��ATRO’s�TS50-22691,�which�has�no�outer�sleeve,�can�be�used�to�rebush�the�OE�rod�or�other�aftermarket�rods.��

�▪ Inner�pin�rotates�for�easy�installation�–�easy�to�align�bolt�holes�(TS00-22500).

�▪ Rebushable

PB46-26268Pivot�Bushing(oversize�version�available)

PL1146Torque�Rod�Bushing

TS50-22691Torque�Rod�Bushing

TR46-41002TR46-41316TR46-41716Torque�Rod

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Hendrickson Haulmaax®

•� Bar�pin�end�bushings�are�used�but�there�are�no�center�bushings�for�the�beams�to�pivot�on.��The�traditional�center�bushing�is�replaced�by�4�narrow�bolster�springs�(8�per�vehicle).

�Transverse�torque�rod�is�critical

�– Check�for�wear�periodically

�Check�bolsters�for�cracks/debonds

�– Replace�if�material�cut�1”�length�or�3/8”�in�depth

�– Replace�if�bond�separation�is�>�½”�deep

•� Polyurethane�material�impervious�to�chemical�attack

�► The�most�common�root�causes�of�cracked�or�broken�frame�brackets:

�– Vehicle�is�overloaded

�– Worn�transverse�torque�rods

�– Frame�bracket�bolts/fasteners�are�loose

�– Auxiliary�spring�is�worn

•� The�location�of�the�debond�may�be�a�secondary�failure�and�the�location�of�the�debond�can�help�locate�the�source�of�the�root�cause.

�Failure�analysis:

LOCATION POSSIBLE PRIMARY FAILURE POINTDebond at top plate Check�torque�rods�for�bushing�failureDebond at lower plate Check�bar�pin�end�bushings�for�failure

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Hendrickson Haulmaax®

�Auxiliary�spring�is�most�important�part!!!

•� 3/8”�or�less�gap�for�ATRO�parts•� When�measuring�the�gap,�it�is�important�to�notice�if�the�top�

shim�plate�is�worn�in�the�middle�of�at�the�surface�where�the�auxiliary�contacts�it�-�the�contact�surface�is�where�the�measurement�matters.

•� ATRO�Technical�Bulletin�TB002-092012�“Evaluation/Replacement�of�Auxiliary�Spring�and�Spring�Shim�on�Haulmaax�Suspension”�outlines�recommended�practices�and�required�guidelines�for�this�application�and�is�available�at��www.atrobushing.com�under�the�“Documents”�menu,�“Technical�Bulletins”�section.

► INSTALLATION DATA/WEAR POINTS: �The�most�critical�part�in�this�suspension�is�the�auxiliary�spring.��A�new�auxiliary�spring�unloaded�measures�3�3/8”�at�its�maximum�height�and�should�be�replaced�when�its�unloaded�height�is�3”�or�less.

EB50-21013Bar�Pin�

Bushing�Kit

MS50-29794Auxiliary�Shim

TS50-22691Torque�Rod�Bushing

TT38000Torque�Rod�Bushing

Torque�RodAvailable�any�length�or�

2-piece�rods

TT50-22697Torque�Rod�Bushing

LP50-24179Bolster��

Spring�Kit

LP50-24974Auxiliary�Spring�Kit

TS38000Torque�Rod�Bushing

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Hendrickson HN®

Bar�pin�end�bushings�are�used�but�there�are�no�center�bushings�for�the�beams�to�pivot�on.��The�traditional�center�bushing�is�replaced�by�2�large�bolster�springs�(4�per�vehicle).

�Transverse�torque�rod�is�critical�– Check�for�wear�periodically

�Check�bolsters�for�cracks/debonds�– Replace�if�material�cut�3”�length�or�1”�in�depth�– Replace�if�bond�separation�is�>1�½”�deep

•� Polyurethane�material�impervious�to�chemical�attack

•� The�location�of�the�debond�may�be�a�secondary�failure�and�the�location�of�the�debond�can�help�locate�the�source�of�the�root�cause.

�Failure�analysis:

LOCATION POSSIBLE PRIMARY FAILURE POINTDebond at top plate Check�torque�rods�for�bushing�failureDebond at lower plate Check�bar�pin�end�bushings�for�failure

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Hendrickson HN®

TT38000Torque�Rod�Bushing

LP50-24974Auxiliary�Spring�Kit

TS38000Torque�Rod�Bushing

HS11000JounceStop

TR710002-Pc�Torque�RodFemale�End

TR750002-Pc�Torque�Rod

Male�End

TR760002-Pc�Torque�Rod

Male�End

LP50-24000Bolster

Spring�(2)

EB50-21013Bar�Pin�

Bushing�Kit

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Visit�www.atrobushing.comClick�on�Document/Product�Spotlight

to�view/download�a�copy�of�the��Hendrickson�HN�Product�Spotlight

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Hendrickson Intraax/Vantraax

•� These�suspensions�feature�a�“tri-functional”�bushing.��The�“tri”�functions�these�bushings�serve�are�to�control�three�road�forces:–– Vertical–forces�absorbed�by�bushing�to�reduce�stress�on�axle–– Horizontal–movement�during�braking�and�acceleration–– Roll–stability�to�maintain�control�while�turning/trailer�

• Thealignmentfunction(Quik-Align)isprovidedbytheOEhardwarepucks.ATRO’sbushinginreplacementoftheOEbushingwillstillallowmanipulationofthepuckstoadjustalignment.

• ForPB50-36000,PB50-36100andPB50-36914:TheOEtri-functionalbushingisslightlylargerontheODthanATRO’sversion(about1/8”).ATRO’sversionismoldednearertotheinstalledcompressedsize.

• ForPB50-36321:TheOEtri-functionalbushingissignificantlylargerontheODthanATRO’sversion(65/16”vs.5½”).TheOEbushingisdesignedforconsiderablecompressionintothebeamhousing.ATRO’sversionismoldedmuchnearertothecompressedsize.

• ATRO’sinstallationtoolsPT50-59307(forTFIIorATRO’sPB50-36914)andPT50-59736(forTFIIIorPB50-36321)willinstall/removeOEbushingand/orATRObushing.Justremovethealignmentpinswheninstalling/removingATRO.Conversely,theOEtoolcanbeusedtoinstall/removebothOEandATRO;simplyremovealignmentpinsfromreardriveplatebeforeattemptingATROinstallation/removal.

ATRO P/N BSHG QTY HARDWARE OE KIT (Bushing)

PB50-36000 1 2�Wear�washers,�2�flat�washers,�1�bolt,�1�locknut S-24691�(TFII)

PB50-36100* 1 2�Wear�washers S-24691�(TFII)

PB50-36914** 1 Alignment�collars,�bolt�sleeve,�bolt,�nut A-6914�(TFII)

PB50-36321 2 4�wear�washers,�4�flat�washers,�2�bolts,�2�locknuts S-26321�(TFIII)

*No�exact�OE�cross�reference.��For�ATRO�customers�who�purchase�hardware�elsewhere.

**Older�version.��Original�version�before�OE�released�Quik-Align�had�thicker�bolts.��Bolt�size�is�different�than�PB50-36000.��

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Hendrickson Intraax/Vantraax

► WEAR ITEMS:���Tri-Functional�bushing�– Mode�of�failure:��bushing�tube�spacers�melt,�inner�sleeve�separated�from�rubber

�– Cause:��excessive�movement�of�suspension�arm�vertically�built�up�excessive�heat

�– Check�to�see�if�tires�are�out�of�balance�or�if�shocks�have�failed.

PT50-59736Installation�Tool

PB50-36321Pivot�Bushing�Kit�(set�of�2)

PB50-36100Pivot�Bushing�

Kit

PB50-36000Pivot�Bushing�

Kit

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Hendrickson Primaax

•� Heavy-duty�air�suspension�for�vocational,�severe-service�and�heavy-haul�applications.��Is�approved�for�use�by�the�OE�for�crane,�dump,�heavy-haul,�logging,�mining,�ready-mix,�oil�field,�tanker�trucks�and�garbage�haulers.

•� Multiple�versions�of�this�suspension.��Variations�in�design�are�usually�in�the�shape�of�the�hangers,�length/location�of�the�shocks�or�unique�air�springs.��Overall�design�idea�is�the�same.

•� ATRO�offers�a�full�complement�of�bushings�and�torque�rod�options�for�Hendrickson’s�Primaax.��The�pivot�bushing,��PB50-26648,�utilizes�a�low�friction�intermediate�sleeve�to�ease�rotation�and�improve�resistance�to�wear.

•� The�OE’s�58648-000�is�used�in�Primaax,�MaxAir�and�Twisted�Sister.�Though�the�bushings�are�direct�cross-references,�ATRO’s�PB50-26648�is�only�for�use�in�Hendrickson’s�Primaax�suspensions�(and�its�variations.)��

�– PB50-26648�has�a�simple�instruction�guideline�in�the�“Instruction�Sheets”�section�under�the�“Documents”�menu.

�– Product�Spotlight�PS001-010311NP�shows�ATRO’s�full�Primaax�replacement�part�line�and�is�available�in�the�“Product�Spotlights”�section�under�the�“Documents”�menu�at�www.atrobushing.com.

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Hendrickson Primaax

► WEAR AREAS:

•� Frame�hanger�attachment�area�becomes�oblong

�– Usually�caused�by�loose�pivot�bolt�fasteners�or�overloading

�– Check�transverse�torque�rods�for�wear,�too

•� Torque�rods�–�bushing�walks�out�of�rod

�– Longitudinal�rods

Check�for�improper�alignment�or�worn�bushings

•� Transverse�rods

�– Check�for�incorrect�axle�alignment,�incorrect�pinion�angle,�incorrect�frame�hole�location�or�axle�bracket�weld�is�off

�– Worn�bushings

TS50-22691Torque�Rod�Bushing

TS38000Torque�Rod�Bushing

TS50-22210Torque�Rod�Bushing

TH50-22692Torque�Rod�Bushing

PB50-26648Pivot�Bushing

SU50-29383D-Pin�Bushing

TR750002�Pc�Torque�Rod

Male�End

TT50-22809Torque�Rod�Bushing

TR710002�Pc�Torque�RodFemale�End

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Visit�www.atrobushing.comClick�on�Document/Product�Spotlight

to�view/download�a�copy�of�the��Hendrickson�Primaax�Product�Spotlight

Visit�www.atrobushing.comClick�on�Document/Installation�Sheets

to�view/download�a�copy�of�the��Hendrickson�PB50-26648�Installation�Sheet

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EB38000Beam�End�Bushing

BM50-66208Rebound�Control�Kit

HC10000Center�Load�Cushion

HC20000Load��

Cushion

HV38000Vertical�Bushing

Hendrickson RS®

•� ATRO�center�bushings�require�thrust�washers

•� ATRO��bushings�have�free-rotation� *eases�installation� *zeroes�out�to�ride�height

•� Polyurethane�material�impervious�to�chemical�attack

•� On�the�RS,�ATRO’s�load�pads�are�made�of�our�proprietary�low�rebound�(no-bounce)�material�to�absorb�shock�and�limit�its�transfer�to�the�frame.��To�accomplish�this�with�rubber,�the�OE�traditionally�offers�2�different�part�numbers�of�varying�hardness�for�specific�applications.��ATRO’s�one�part�number�will�perform�reliably�in�any�application.�

TS38000Torque�Rod�Bushing

CB38011/12Center�

Bushing�Kit

Torque�RodAvailable�any�length��or�2-piece�rods

EB50-21013Bar�Pin�

Bushing�Kit

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Hendrickson RT®

•� ATRO�center�bushings�require�thrust�washers

•� ATRO��bushings�have�free-rotation�– eases�installation�– zeroes�out�to�ride�height

•� Polyurethane�material�impervious�to�chemical�attack

AK38200Beam�End�Adapter�Kit

CB38012Center�

Bushing�Kit

CT10000Cross�Tube

EB38000Beam�End�Bushing

CB38011Center�

Bushing�Kit

TS38000Torque�Rod�Bushing

TR710002-Pc�Torque�Rod,�Female

TR750002-Pc�Torque�Rod,�Male

EB50-21013Bar�Pin�

Bushing�Kit

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Hutch H/CH 7700/9700ATRO offers:•� Cast�or�fabricated�equalizers•� Equalizer�kit�includes�hardware

ATRO’s�torque�rod�bushings�have�retaining�rims•� 2-piece�design

► Wear items:•� Equalizer/bushings•� Torque�rods/torque�rod�bushings

� ATRO benefit:•� ATRO�equalizer�kits�include�hardware

**Equalizer��Bushing�Kits

*Equalizer�Beams��w/Bushings

PL1119Torque�Rod�Bushing

TH53-37149Torque�RodBushing�Kit

*EQ53-35001,�EQ53-35158,�EQ53-35250,�EQ53-35701**�EQ53-35118,�EQ53-35234

TR53-41500Torque�RodFixed�Length

TR53-45305Torque�Rod

Adjustable�Length

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International Corporate Air/IROS•� Similar�in�concept�to�the�Freightliner�FAS�II�and�Peterbilt’s�New�

Low�Air�Leaf.

•� The�biggest�concern�with�bonded�bushings�is�the�spring�eye�opens�up�and�the�bushing�can�walk�out:���– With�a�bonded�OE-style�rubber�bushing,�the�pin�is�not�allowed�to�rotate,�so�the�ENTIRE�bushing�can�be�forced�to�spin�within�the�eye�of�the�spring�thus�leading�to�the�wallowed�out�spring�eye.��Bonded�rubber�bushings�attempt�to�combat�this�with�an�inboard�flanged�end�encased�in�a�ring�with�detents�for�“gripping”�the�edge�of�the�spring’s�eye.

�– With�ATRO’s�rotating�bushing,�the�outer�sleeve�and�urethane�rotate�around�the�fixed�pin.

•� ATRO�spring�eye�bushing�design�(PB46-26268):�– Outer�sleeved�is�flanged�to�limit�lateral�travel�– Inner�pin�rotates�rather�than�entire�bushing�spinning

• ATRO torque rod:�– The�OE�offers�multiple�torque�rod�options�on�this�suspension.��The�OE�standard�can�be�replaced�by�ATRO’s�TR55-418C1–�but�the�published�options�include�non-rebushable�rods,�those�rebushed�with�TS34000�bushings,�or�even�tubular�rods�with�jam�bushings�(ATRO’s��TS50-22691.)

�– Inner�pin�rotates�for�easy�installation�–�easy�to�align�bolt�holes�(TS34000�and�TS38000)

�– Rebushable

PB46-26268Pivot�Bushing(oversize�version�available)

PL1146Torque�Rod�Bushing

TR55-418C1Torque�Rod

TS50-22691Torque�Rod�Bushing

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International Z Air Spring Suspension

•� This�suspension�could�be�spec’d�with�many�different�torque�rod�bushings:��small�jam�bushings�(PL1146),�conventional�size�(TS38000/TT38000),�non-rebushable.

•� ATRO’s�TR55-41117�replaces�what�appears�to�be�the�most�popular�spec’d�length,�18�1/8”.��This�uses�ATRO’s�small�rod�eye�design�with�TS00-22500�bushings.

•� The�Z�Spring�replaces�the�heavier�paddle�and�adds�to�deflection�as�well�as�acting�as�the�mount�for�the�air�spring.

► Wear Items:�— Torque�rods/torque�rod�bushings�— Spring�wear�pad�(WP55-290C1)�— Shocks

TR750002�Pc�Torque�Rod

Male�End

TR710002�Pc�Torque�Rod

Male�End

TR55-41117Torque�RodSmall�Eye

PL1146Torque�Rod�Bushing

WP55-290C1Wear�Pad

TS50-22256Torque�Rod�Bushing

TS38000Torque�Rod�Bushing

TS34000Torque�Rod�Bushing

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Kenworth AirGlide 100•� There�are�four�torque�rods�-�two�transverse,�two�radial�track�

rods.��The�radial�rods�(running�the�length�of�the�vehicle)�can�be�either�24”�(TR59-41375)�for�52”�axle�spread�or�25”��(TR59-41150)�for�54”�axle�spread.�The�two�transverse�rods�are�both��TR59-41376.

•� The�OE�rubber�sway�bar�wrap�bushing�does�not�have�tabs,�but�when�the�bushing�is�compressed�in�the�housing,�the�rubber�bulges�out�effectively�forming�side�tabs.��ATRO�molds�those�side�tabs�into�the�part�in�the�PL1008;�the�PL1184�is�molded�without�tabs.�

•� The�sway�bar�bushings�are�replaced�with�the�TS38000.��The�bushings�are�designed�to�withstand�the�extra�heat�generated�from�the�high-frequency,�low�amplitude�vibration�(aka�“road�noise”)�the�U-shaped�sway�bars�encounter�in�service.�

PL1008Air�Ride�Bushing

TS38000Torque�Rod�Bushing

TR59-41150Torque�Rod

TT38000Torque�Rod�Bushing

TR59-41375Torque�Rod

TR59-41376Torque�Rod

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Kenworth AirGlide 200/400•� AirGlide�200�can�be�retrofitted�up�to�an�AirGlide�400

•� ATRO’s�Technical�Guidelines�sheet�TG031309�discusses�important�installation�points,�identifies�those�parts�in�our�kit�which�are�optional�and�gives�other�recommended�practices.��It�is�available�at�www.atrobushing.com�under�the�“Documents”�menu,�“Technical�Bulletins”�section.�

•� Additional�benefits�found�on�Tech�Bulletin�TB060509�in�the�“Technical�Bulletins”�section�under�the�“Documents”�menu�on�our�website.

•� The�four�upper�torque�rods�are�uniquely�positioned�in�this�suspension.��This�suspension�combines�the�transverse�and�longitudinal�torque�rods�into�a�dual�rod,�V�configuration�with�the�torque�rods�mounted�vertically.�Our�TS59-22400�bushing�is�a�High�Articulation�bushing�designed�to�withstand�the�conical�motion�required.��It�is�the�only�ATRO�torque�rod�bushing�approved�for�use�in�OE�aluminum�rods.��It�features:�– Articulation�voids�to�provide�extra�vertical�motion�– Modified�pin�(compared�to�our�standard�TS38000�pin)

•� �ATRO’s�replacement�torque�rod�is�TR59-41474.��It�features:�– Stronger,�more�durable�steel�rod�than�aluminum�rod�– Forged�steel�rod�eyes�– Heavy-walled�steel�shaft

Sway bar bushings:•� TS38000�for�heat�build�up�from�road�noise•� (See�AirGlide�100�section�for�technical�details.)

Sway bar kits:•� SW59-29000-KIT�(2�bushed�bars�+�hardware)•� SW59-29000�(1�bushed�bar)

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PART NUMBER LOCATION HEAT TOLERANCETS59-22400 Torque�Rods�only Normal

TS38000 Sway�Bar/Torque�Leaf�only Slightly�Higher

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Kenworth AirGlide 380Peterbilt FlexAir

•� On�a�Kenworth�it’s�branded�as�an�AirGlide�380;�on�a�Peterbilt�this�same�suspension�is�branded�as�a�Flex�Air.��The�C-shaped�spring�link�makes�this�suspension�easily�identifiable.��ATRO�offers�the�spring�link�bushings�SU00-29001�(straddle)�and�SU00-29002�(hollow�mount).

•� There�are�six�torque�rods�–�two�transverse,�two�lower�front,�two�lower�rear.��The�front�rods�(TR00-41001)�are�almost�an�inch�shorter�than�the�rear�rods�(TR00-41600)�but�both�front�and�rear�have�a�straddle-hollow�mount�configuration.��The�two�transverse�rods�(both�are�TR00-41009)�have�a�straddle-straddle�configuration.

► High wear item:��Transverse�torque�rods!

•� All�replacement�torque�rods�on�this�suspension�have�the�smaller�2”�rod�eye�with�ATRO’s�TS00-22500�(straddle)�and�TH00-22500�(hollow).��These�bushings�have�outer�sleeves,�the�pins�rotate,�and�the�rods�are�rebushable�with�ATRO�bushings�only.��

•� To�rebush�the�OE�rod�with�1�7/8”�rod�eyes,�use�ATRO’s��TS50-22691�(straddle)�and�TH50-22692�(hollow).

SU00-29002Spring�LinkBushing

SU00-29001Spring�Link�Bushing

TH00-22500Torque�RodBushing

TS00-22500Torque�RodBushing

TR00-41600Torque�RodSmall�Eye

TR00-41001Torque�RodSmall�Eye

TR00-41009Torque�RodSmall�Eye

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Mack CamelbacksATRO load pads:

•� Low�rebound�–�no�bounce•� Chemically�resistant•� Don’t�mix�ATRO�with�others

► Wear items:•� Load�pads•� Trunnion�bushings•� Torque�rod/torque�rod�bushings

� ATRO benefits:•� Specially�formulated�for�this�application,�ATRO’s�

proprietary�polyurethane�takes�the�bounce�out�and�acts�as�a�shock�absorber.��The�significantly�improved�ride�is�immediately�noticeable!

•� This�reduces�cab�damage�and�T-leaf�breakage,�too.•� Extended�life�load�pad.

MS62-29246Insulator�

Spacer�Block

TM38000Torque�Rod��Bushing

MackLoad�Pads

Upper�&�Lower

MackTrunnion�Bushings

TS38000Torque�Rod�Bushing

Torque�RodAvailable�any�length�or�

2-piece�rods

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MFR ROD BUSHING REBUSH-ABLE ROTATING

OE 1�1/8"�O.D. TS34000�(2�17/32") Varies NoATRO 1�1/4"�O.D. TS38000�(2�3/4")� Yes Yes

Peterbilt Air LeafEye casting bolted to the spring houses the pivot bushing (ATRO’s PB75-29674, OE’s 03AL1):•� PB75-29674�is�a�spring�eye�bushing�service�kit�that�has�

bushings,�sleeve,�washers�and�hardware.��The�polyurethane�components�within�this�kit�are�PL1076�and�PL1075�(2�each�kit)�and�are�also�available�separately.��(PB75-29674�is�½”�longer�than�the�original�design�Low�Mount�Air�Leaf�version,�PB75-29101.)

•� Tech�Guidelines�bulletin�TG103009�outlines�recommended�installation�sequence�for�PB75-29674�and�is�available�at��www.atrobushing.com�under�the�“Documents”�menu,�“Technical�Bulletins”�section.

ATRO’s torque rods (ATRO’s TR75-41059, OE’s 03-04059):•� Rebushable�(OE�standard�is�non-rebushable;�rebushable�

options�available)•� Rotating-pin�for�easy�installation•� Heavy-duty�bushing�(OE�standard�bushing�has�smaller�O.D.)

► Wear items:•� Spring�eye�pivot�bushing•� Torque�rod/torque�rod�bushings

Torque Rod Comparison:

TS34000Torque�Rod�Bushing

PL1076Beam�End�Washer

TR75-41059Torque�Rod

PL1075Air�Leaf�Bushing

PB75-29674Air�Leaf�Bushing�Kit

PL1026Shock�Bushing

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Peterbilt Air TracATRO’s torque rods for upper transverse rod replacement (ATRO’s TR75-41059, OE’s 03-04059):•� Rebushable�•� Rotating-pin�for�easy�installation•� Heavy-duty�bushing�(OE�standard�bushing�has�smaller�O.D.)•� If�rebushing�ATRO’s�TR75-41059,�use�ATRO’s�TS38000•� If�rebushing�OE/aftermarket�rods,�use�ATRO’s�TS34000�

ATRO’s torque rods for lower rod replacement:•� The�lower�rods�come�in�two�versions.��

�– ATRO’s�TR75-41119�is�a�direct�OE�replacement�-�both�use�the�larger�straddle�bushing�(TS38000).��

�– ATRO’s�TR75-41327�option�is�also�a�direct�replacement�to�the�OE�offering.��Note:��the�bushings�within�the�same�rod�differ:��the�axle�bracket�end�has�a�¾”�bolt�but�the�frame�side�has�5/8”�bolt.��ATRO’s�rod�has�a�TS38000�in�one�end�and�a�TS38750�in�the�other.��

•� Rebushable�•� Rotating-pin�for�easy�installation

ATRO�also�offers�the�spring�roller,�SU75-29623,�or�the�complete�spring�roller�kit,�SU75-29624ATRO�pricing�on�the�kit�includes�the�urethane�and�steel�rollers�PLUS�the�bolt,�nut�and�washer.

► Wear items:•� Torque�rod/torque�rod�bushings•� Spring�roller�

TR75-41059,TR75-41119TR75-41327TorqueRod

TS38750Torque�Rod�Bushing

TS34000Torque�Rod�Bushing

TS38000Torque�Rod�Bushing

PL1026Shock�Bushing

SU75-29623Spring�RollerSU75-29624

Spring�Roller�Kit

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Page 57: Page 1 · PDF filePeterbilt - Air Leaf 52 Peterbilt - Air Trac 53 Peterbilt - Low Mount Air Leaf 56 Peterbilt - New Low Air ... zeroes out the bushing to proper ride height

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Peterbilt Low Mount Air LeafEye casting bolted to the spring houses the pivot bushing (ATRO’s PB75-29101, OE’s 03AL2):•� PB75-29101�is�a�spring�eye�bushing�service�kit�that�has�

bushings,�sleeve,�washers�and�hardware.��The�polyurethane�components�within�this�kit�are�PL1076�and�PL1189�(2�each�kit)�and�are�also�available�separately.���

•� Tech�Guidelines�bulletin�TG103009�outlines�recommended�installation�sequence�for�PB75-29101�and�is�available�at��www.atrobushing.com�under�the�“Documents”�menu,�“Technical�Bulletins”�section.

ATRO’s torque rods (ATRO’s TR75-41108, OE’s 03-05108):•� Rebushable�(OE�standard�is�non-rebushable)•� Rotating-pin�for�easy�installation•� Heavy-duty�bushing�(OE�standard�bushing�has�smaller�O.D.

► Wear items:•� Spring�eye�pivot�bushing•� Torque�rod/torque�rod�bushings

Torque Rod Comparison:

TS34000Torque�Rod�Bushing

PL1189Spring�Eye�Bushing

TR75-41108Torque�Rod

PL1076Beam�End�Washer

PB75-29101Air�Leaf�Bushing�Kit

MFR ROD BUSHING REBUSH-ABLE ROTATING

OE 1�1/8"�O.D. TS34000�(2�17/32") No NoATRO 1�1/4"�O.D. TS38000�(2�3/4")� Yes Yes

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Page 59: Page 1 · PDF filePeterbilt - Air Leaf 52 Peterbilt - Air Trac 53 Peterbilt - Low Mount Air Leaf 56 Peterbilt - New Low Air ... zeroes out the bushing to proper ride height

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Peterbilt New Low Air Leaf•� Similar�in�concept�to�the�Freightliner�FAS�II�and�the�

International�Corporate�Air/IROS.

•� The�biggest�concern�with�bonded�bushings�is�the�spring�eye�opens�up�and�the�bushing�can�walk�out:��

�– With�a�bonded�OE-style�rubber�bushing,�the�pin�is�not�allowed�to�rotate,�so�the�ENTIRE�bushing�can�be�forced�to�spin�within�the�eye�of�the�spring�thus�leading�to�the�wallowed�out�spring�eye.��Bonded�rubber�bushings�attempt�to�combat�this�with�an�inboard�flanged�end�encased�in�a�ring�with�detents�for�“gripping”�the�edge�of�the�spring’s�eye.

�– With�ATRO’s�rotating�bushing,�the�outer�sleeve�and�urethane�rotate�around�the�fixed�pin.

•� ATRO�spring�eye�bushing�design�(PB46-26268):�– Outer�sleeved�is�flanged�to�limit�lateral�travel�– Inner�pin�rotates�rather�than�entire�bushing�spinning

• ATRO torque rod:�– Uses�ATRO�torque�rod�TR00-41009.��This�is�a�small-eyed�rod�with�TS00-22500�in�each�end.��The�bushing�in�these�rods�is�a�TS00-22500�–�it�will�not�fit�OEM�or�other�aftermarket�rods.��To�rebush�OE�rod�or�other�aftermarket�rod,�use�ATRO’s�TS50-22691.�

�– Inner�pin�rotates�for�easy�installation�–�easy�to�align�bolt�holes�(TS00-22500�only.)

�– Rebushable

PB46-26268Pivot�Bushing

TR00-41009Torque�Rod

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High-Temperature Underhood Mounts

•� ATRO�recently�launched�its�newest�breakthrough�product�line�–�High-Temperature�motor�mounts�and�underhood�components.�ATRO�is�one�of�several�companies�releasing�new�products�that�can�tolerate�higher�temperatures.��So,�why�has�under�hood�heat�become�such�an�issue?

•� EPA�Tier�3�emission�standards,�in�effect�since�2007–2010,�mandate�that�diesel�engine�manufacturers�reduce�emission�levels�of�NOx�(nitrogen�oxides).��The�ripple�effect�created�by�the�necessary�underhood�changes�gets�complicated�because�each�solution�creates�new�problems�in�another�area.��The�most�significant�is�only�beginning�to�be�recognized:��elevated�under�hood�temperatures.

•� Here’s�the�big�picture�short�version:New�engine�designs�use�EGR�to�control�NOx�emissions�by�recirculating�some�of�the�exhaust�gases�back�into�the�combustion�chamber.��Due�to�the�mix�of�exhaust�with�air�entering�the�combustion�chamber,�there�is�less�oxygen�than�if�it�were�just�air.�With�less�oxygen�it�doesn’t�burn�as�hot�and�at�a�lower�temperature�NOx�don’t�get�a�chance�to�form�in�the�first�place�–�thus�lower�NOx�emission�levels.��But�here’s�the�kicker�- the exhaust is cooled before it is reintroduced to the combustion chamber.��Engine�manufacturers�have�always�used�the�basic�rule�of�thumb�that�the�energy�output�of�the�engine�is�equally�divided�with�1/3�going�to�power,�1/3�to�exhaust�and�1/3�used�to�cool�the�engine.� In these new engine systems, the cooling system is now over-burdened by 15 – 30% because it must additionally cool the exhaust gas before it can recirculate for round two.

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• Do not mix standard mounts and HT mounts of the same part number– if the standard mounts are affected by heat and melt (or soften and compress), the full weight of the engine/tranny will fall on the unaffected HT mount. ONE EXCEPTION to this mixing rule is on the Kenworth mounts KT59-62001 and KT59-62002-HT (or KT59-62003-HT which includes hardware.) In this one application, ATRO offers the front mounts in HT but not the rear mounts. The front mounts are susceptible to heat-related failure but the rear mounts show no such track. The material used in the rear mounts address vibration isolation specifically – the added expense of an HT modification is not necessary.

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Hendrickson Intraax

Freightliner FASII

Hendrickson Haulmaax

Chalmers

Hendrickson HN

Hendrickson RS Hendrickson RT

Hendrickson Primaax

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Kenworth AirGlide 100 Kenworth AG380/PB FlexAir

Kenworth AirGlide 400 Mack Camelback

Hutchens International Corp Air/IROS

Peterbilt Air TracPeterbilt Air Leaf

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Peterbilt Low Air Leaf Peterbilt New Low Air Leaf

www.atrobushing.com

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