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- Page 1 -
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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 -
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
- Page 4 -
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.
- Page 5 -
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
- Page 6 -
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.
- Page 7 -
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
- Page 8 -
Restrain�axle�rotation Locate�axle,��maintain�alignment
Control�driveline�angle Absorb�leaning,��cornering�forces
Bushing�material�is�torn�or�cracked
Bushing�“walk�out”
- Page 9 -
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.
- Page 10 -
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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.
- Page 12 -
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 -
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
- Page 14 -
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
- Page 15 -
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
- Page 16 -
- Page 17 -
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
- Page 18 -
- Page 19 -
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
- Page 20 --�Continued�-
- Page 21 -
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
- Page 22 -
- Page 23 -
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
- Page 24 --�Continued�-
- Page 25 -
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
- Page 26 -
Visit�www.atrobushing.comClick�on�Document/Product�Spotlight
to�view/download�a�copy�of�the��Hendrickson�HN�Product�Spotlight
- Page 27 -
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.��
- Page 28 --�Continued�-
- Page 29 -
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
- Page 30 -
- Page 31 -
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.
- Page 32 --�Continued�-
- Page 33 -
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
- Page 34 -
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
- Page 35 -
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
- Page 36 -
- Page 37 -
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
- Page 38 -
- Page 39 -
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
- Page 40 -
- Page 41 -
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
- Page 42 -
- Page 43 -
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
- Page 44 -
- Page 45 -
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
- Page 46 -
- Page 47 -
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)
- Page 48 -
PART NUMBER LOCATION HEAT TOLERANCETS59-22400 Torque�Rods�only Normal
TS38000 Sway�Bar/Torque�Leaf�only Slightly�Higher
- Page 49 -
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
- Page 50 -
- Page 51 -
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
- Page 52 -
- Page 53 -
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
- Page 54 -
- Page 55 -
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
- Page 56 -
- Page 57 -
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
- Page 58 -
- Page 59 -
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
- Page 60 -
- Page 61 -
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.
- Page 62 -
• 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.
- Page 63 -
Hendrickson Intraax
Freightliner FASII
Hendrickson Haulmaax
Chalmers
Hendrickson HN
Hendrickson RS Hendrickson RT
Hendrickson Primaax
- Page 64 -
Kenworth AirGlide 100 Kenworth AG380/PB FlexAir
Kenworth AirGlide 400 Mack Camelback
Hutchens International Corp Air/IROS
Peterbilt Air TracPeterbilt Air Leaf
- Page 65 -
Peterbilt Low Air Leaf Peterbilt New Low Air Leaf
www.atrobushing.com
- Page 66 -