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APPLICATIONGUIDEHENDRICKSON TRAILER AXLE

LIT NO: L980DATE: August 2011 REVISION: B

TABLE OF CONTENTS

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

PURPOSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

AXLE IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

INTERPRETING TRAILER AXLE PART NUMBERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

INTERPRETING TRAILER AXLE DESCRIPTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

TRLAXLE MODEL NUMBERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

AXLE RECOMMENDED USE GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

BEARING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

BRAKE SETUP CONFIGURATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

VALUE ADDED OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

GROSS AXLE WEIGHT RATING AND AXLE BEAM RATING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

AXLE BEAM RATING - STRAIGHT AXLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

AXLE BEAM RATING - DROP CENTER AXLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

S-CAMS AND BRAKES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

CAM SAME VS. CAM OPPOSITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

AXLE STRUCTURAL RATING VS. BRAKE PERFORMANCE RATING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

S-CAM DRUM BRAKE RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

BRAKE CHAMBER BRACKETS AND SLACK ADJUSTER CLEARANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

APPLICATION GUIDE — HENDRICKSON TRAILER AXLE

2L980 B


3L980 B

INTRODUCTION

Hendrickson presents this publication to aid in understanding the Hendrickson Trailer Axle product offering and the application requirements.Hendrickson Trailer Axles are engineered to meet the demanding requirements of the industry andincorporate the latest design and manufacturing technologies. These products are built specifically to provide a durable trailer axle to the market.

GENERAL INFORMATION

The descriptions and specifications contained in thispublication are current at the time of printing.

Hendrickson reserves the right to discontinue or modify its models and / or procedures and to change specifications at any time without notice.

Any reference to brand names in this publication are made as an example of the types of tools andmaterials recommended for use and should not be considered an endorsement. Equivalents may be used.

IMPORTANT NOTICE

Hazard signal words (such as Warning or Caution) appear in various locations throughout this publication. Information accented by one of these signal words must be observed at all times.

Additional notes are utilized to emphasize areas ofprocedural importance and provide suggestions forease of repair. The following definitions indicate theuse of these signal words as they appear throughoutthe publication.

WARNING: INDICATES HAZARDS OR UNSAFEPRACTICES WHICH COULD RESULTIN SEVERE PERSONAL INJURY ORDEATH.

CAUTION: Indicates hazards or unsafepractices which could result indamage to equipment or minorpersonal injury.

NOTE: Additional service information not covered inthe service procedures.

Welding or machining on any axle component is prohibited unless noted otherwise in this document or other Hendrickson service literature.

Fixed (mechanical) axle stops are prohibited to contact the axle and limit travel.

Swing arm mechanisms are approved in some loading and unloading applications. ContactHendrickson for assistance.


4L980 B

PURPOSE

The purpose of this document is to provide originalequipment manufacturers (OEMs) of medium andheavy-duty vehicles with application guidelines forHendrickson trailer axles. The user of this documentcan use charts found in this book to determine theGross Axle Weight Rating, (GAWR) of theirHendrickson trailer axle in North America.

USE OF GUIDELINES

These guidelines apply to: on-, on-off and off- highway (AA) turnpike or interstate, (A) on-highway,(B) on- / off- highway or mountainous highway, (C)off-highway vocational categories and axle applications for vehicles operated in North America.

VOCATIONAL CATEGORIES:

Airport fueler, city delivery, construction, crane, firetruck, heavy haul, intra-city coach, line haul, logging,military, mining, motorhome, oil field, refuse, rescue /crash, school bus, shuttle bus, snow removal, transitbus and utility.

AXLE APPLICATIONS: Trailer axles used in trailertypes such as the following in Figure 1:

figure 1: Trailer axles used in trailer types

AXLE APPLICATIONS: Trailer axles used as AUXILIARYLIFT AXLES in vehicles :

VEHICLE TYPES include: dump trucks, bottom dump,bulk hauler, bus / coach, car carrier, end dump,mixer, RV with trailer, semi-end dump, straight truck,tanker, tractor with trailer, transfer-dump, truck withtrailer and wrecker.


5L980 B

These guidelines do not apply to the use ofHendrickson trailer axles outside of North America in vocational categories, axle applications (TrailerTypes or Vehicle Types) other than those specified in this book or ratings other than those listed in this book. Approval for such uses may be requestedon an individual basis by submitting an approvalrequest to Hendrickson. To submit such request,please fill out the Hendrickson Trailer Axle OrderingGuide (L954). This form can be found online atwww.hendrickson-intl.com.

WARRANTY

Hendrickson trailer axle warranties are set out in the Comprehensive Warranty Statement for USA and Canada (L583). Warranty statements can be obtained via the Hendrickson website atwww.hendrickson-intl.com. Applications and installations must either meet the requirements of these guidelines for automatic approval or beapproved in writing by Hendrickson’s engineeringdepartment. Failure to obtain application approval for the use of Hendrickson trailer axles or their components in non-approved applications will void the warranty. Modification of the vehicle or axle and brake configuration, changes in the vocational use or service outside the limits of these guidelines may void warranty coverage.

QUESTIONS

For answers to questions concerning the guidelinesor to request a Hendrickson trailer axle Spec Form fora use not covered by these guidelines, contact:

Hendrickson Trailer Suspensions2070 Industrial Place S.E.Canton, OH 44707-2641Telephone: 866-743-3247 (866-RIDE-AIR)Website: www.hendrickson-intl.com

CHANGES TO GUIDELINES

These guidelines are subject to change at any timewithout prior notice at the discretion of Hendrickson. To get the most up-to-date version of these guidelinesvisit www.hendrickson-intl.com.

STANDARD PRODUCT OFFERINGS

The model number, customer part number (if applicable), a description and a serial number are all imprinted on an ID tag that is attached to the axle (as shown in figure 3).

Older trailer axle product ID tags were made of mylerand located near the center of the axle beam. Newertrailer axle products have a stainless steel ID taglocated on the inside edge of the brake chamberbracket.

The part number is used to identify the axle specifications. This number should be referred towhen contacting Hendrickson to determine the appropriate service parts. The serial number is usedto identify a particular axle along with all of the component parts as specified by the customer at thetime of order. The axle description serves as a generic description of the axle assembly and can beused to determine some specific axle configurationparameters.


6L980 B

AXLE IDENTIFICATION

Standard Hendrickson trailer axles are available in various spindle and tube combinations and aredesigned for on-highway use. Axles are available instraight or drop- or raised- center axles (as shown infigure 2) and can be ordered fully dressed with hubsand brake drums. Other miscellaneous componentssuch as slack adjusters, air chambers, cam tubes,etc. can also be specified.

Straight Axle Bent or Drop-center Axle

figure 3

figure 2

CUS P/N

S/N

NEW ZEALAND PATENT NOS: 510161,527792, 535511, 536263AND OTHER ISSUED FOREIGN PATENTS ANDPENDING U.S. AND FOREIGN PATENTS.

TMHTA AXLE

MANUFACTURED UNDER ONE OR MORE OFTHE FOLLOWING PATENTS:U.S. PATENT NOS.: 6024417, 6725743,

7559521, 7585031, 7731300

248384, 251415, 259900

6926122, 7273082, 7506940, 7537224,

MEXICAN PATENTE NOS.: 223713, 243519

AUSTRALIAN PATENT NOS.: 739422,2002320074, 2003243658, 20042201482006287900, 2006302001

DESC

MODEL

New Stainless Steel ID Tag for Trailer AxlesLocation of new Stainless Steel ID Tag –

outside edge of the brake chamber bracket


7L980 B

AXLE MODEL AND SPINDLE TYPE• A45 - Tapered spindle, solid bar• A65 - Tapered spindle, solid bar• D10 - Tapered spindle / Steer axle• D22 (HN) - Tapered spindle• K22 - Tapered spindle, press-up• S22 - Tapered spindle, solid bar• K30 - Tapered spindle, press-up• S30 - Tapered spindle, solid bar• P22 (HP) - Pro-Par style spindle• T24 - Drive axle / Truck spindle

AXLE TYPE• AX - Straight axle• AU - Bent-tube (drop-center) axle• AD - Straight axle, air disc brake

WALL THICKNESS• 1 - Stub axle (an axle cut in half) right• 2 - Stub axle (an axle cut in half) left• 3 - Stub axle (an axle cut in half) universal• 5 - ½" Nominal wall thickness, 5.00" OD• 6 - 5/8" Nominal wall thickness, 5.00" OD• 6 - 5/8" Wall thickness, 5.00" and 5.75" OD• 7 - ¾" Wall thickness, 5.00" OD• 8 - Solid bar

SEVENTH DIGIT• 0 - Standard trailer axle• 1 - iPAC suspension axle, no longer used• 2 - AdVANtage suspension axle• 5 - Nominal ½" wall stub axle, 5.00" OD• 6 - Nominal 5/8" wall stub axle, 5.00" OD• 6 - 5/8" Wall stub axle, 5.00" and 5.75" OD• 7 - ¾" Wall stub axle, 5.00" OD• 8 - Machined from solid bar stub axle• H - 5/8" HD wall, 5.00" OD

WHEEL-END CONFIGURATION• 0 - With spider / flanges, no brakes, hubs or

drums• 1 - With brakes, hubs and drums• 2 - With spiders / flanges, hubs and drums,

no brake shoes• 3 - With brakes, no hubs or drums• 4 - With hubs, no spiders / flanges or brakes• 5 - No spiders / flanges, brakes, hubs or drums

NINTH DIGIT• A - Assemble to order options are picked at the

time of placing the axle order. Options include brake shoe lining, ABS sensor installation and brand selection. Assemble to order options are for double anchor pin (DAP) axles only.

TENTH DIGIT UP• Axle specific - Numbers are sequential and are

used to record the bill of material for each axle

INTERPRETING TRAILER AXLE PART NUMBERS (DAP)

AX 5 0 3 AXXXX

Axle Model and Spindle Type

Axle Type

Wall Thickness

Application Specific

Wheel-end Configuration

Seventh Digit

D22


8L980 B

AXLE MODEL AND SPINDLE TYPE• A45 - Tapered spindle, solid bar, straight axle• A65 - Tapered spindle, solid bar, straight axle• D10 - Tapered spindle, straight axle• DD10 - Tapered spindle, drop-center axle• D22 (HN) - Tapered spindle, straight axle• DD22- Tapered spindle, drop-center axle• K22 - Tapered spindle, press-up, straight axle• S22 - Tapered spindle, solid bar, straight axle• K30 - Tapered spindle, press-up, straight axle• S30 - Tapered spindle, solid bar, straight axle• P22 (HP) - Pro-Par style spindle, straight axle• PD22- Pro-Par style spindle, drop-center axle• T24 - Drive axle / Truck spindle, straight axle• TD24 - Drive axle / Truck spindle, drop-center

axle

BRAKE SHOE TYPE• CS - Cast Shoe• FB - Fabricated, Bolted lining• FC - Fast Change fabricated• FCX - Fast Change Xtra Life• FCXX - Fast Change Xtra Life II• FT - Fabricated, Tapered (pin style)• N - No brakes, flanges spiders• NBW - No Brakes, With spiders• NB - No brakes, with flanges• ADB - Air disc brakes

BRAKE SIZE• 123 - 121/4" X 3" — no longer available• 1235 - 121/4" X 31/2" — no longer available• 1250 - 121/4" X 5" — no longer available• 1255 - 121/4" X 51/2"• 1275 - 121/4" X 71/2"• 153 - 15" X 3" — no longer available• 154 - 15" X 4" — no longer available• 155 - 15" X 5" — no longer available• 157 - 15" X 7" — no longer available• 1586 - 15" X 85/8"• 165 - 161/2" X 5" • 166 - 161/2" X 6" — no longer available• 167 - 161/2" X 7"• 1680 - 161/2" X 8" — no longer available• 1686 - 161/2" X 85/8"• 1610 - 161/2" X 10" — no longer available• 187 - 18" X 7"• 208 - 20" X 8"

SPIDER TYPE• B - Bolt-on• F - Flanges only (for bolt-on spider “retrofit”)• W - Weld on

WHEEL-END TYPE• NH - No hub or wheel• W - Cast spoke wheel• WD - Cast spoke wheel and drum• B6 - 6 stud 83/4 BC hubs• B8 - 8 stud 61/2 BC hubs• B10 - 10 stud 111/4 BC hubs• B13 - 10 stud 133/16 BC hubs• B18 - 10 stud 83/4 BC hubs• SW6 - 6 stud 83/4 BC hubs• SW8 - 8 stud 61/2 BC hubs• SW10 - 10 stud 111/4 BC hubs

AIR CHAMBER• A - Air chambers mounted on axle

INTERPRETING TRAILER AXLE DESCRIPTORS

FC 167 W NH A

Axle Model and Spindle Type

Brake Shoe Type

Brake Size

Air Chamber

Wheel-end Type

Spider Type

D22


9L980 B

TRLAXLE MODEL NUMBERS

In June 2008, Hendrickson announced the implementation of a new configuration system fornonintegrated trailer axles called TRLAXLE. Your customer service representative will be able to create a TRLAXLE model number and provide a price on most HN (D22) and HP (P22) axles when you send in your completed Axle OrderingGuide (L964) or Electronic Axle Ordering Guide(E964). Other specialty axles (drop- or raised-center axles, A45/A65, K22/K30, D10/D21 and T24)will continue to use their current model number des-ignations, like D22AU603A2-2 or K30AX603A22-2.

Most HN and HP axle specs have been converted to new TRLAXLE.### model numbers. In most cases,the TRLAXLE bill of material will be identical to theD22 or P22, except with following componentchanges, if applicable:

• Stemco Voyager is the standard seal replacingChicago Rawhide

• Abex 3030-197 brake lining (Abex 931-162 for 12.25" × 7.50" brake size) is the standard brake lining; Spicer Silver Supreme and Haldexbrake linings are discontinued

• Hendrickson's patented axle filter is the standard on all axles

• New configurations require specifying (1) slacks only, (2) both slacks and chambers or (3) neither slacks or chambers; we cannot configure chambers only

• ABS sensors on drum brake specs are 90 degrees, not straight

• ABS sensors on air disc brake specs are straight, not 90 degrees

• Castellated nuts are not configurable and must be ordered separately

In general, TRLAXLE product allows all the samestandards and options currently available onINTRAAX®, such as:

• Hendrickson proprietary wheel-end packages:HVS (3-yr), HLS (5-yr) and HUS® (7-yr)

• TIREMAAX® CP and EC• Brake sizes, plus 121/4" × 71/2", 121/4" × 51/2" and

121/4" × 5"• Brake lining options

In addition to a new TRLAXLE model number,Hendrickson made the axle description more meaningful. Below is a guideline for interpreting the new description of your TRLAXLE model number.Newly created, non-configurable axle specs and specialty axles will also adopt this new descriptionlogic. The following box provides a detailed explanation of all the new axle description codes.

For additional information, call 1-866-RIDEAIR (743-3247) or visit www.hendrickson-intl.com.

Model Number: TRLAXLE.13

DESCRIPTION: HN- S 50 5 - 0774 - W F 1670 L - S H M 1-C O -

Spin

dle

Axle

Typ

e

Tube

Siz

e

Tire

Infla

tion

Tube

Wal

l

Axle

Tr

ack

Auto

Lub

e

Spid

er T

ype

Brak

e Ty

pe

Brak

e Si

ze

Cam

Len

gth

Cam

Opt

ion

ABS

Opt

ion

Brak

e Ad

just

ers

Cham

bers

RTR

Pack

ages

RTR

Lube

Dus

t Shi

elds


10L980 B

HENDRICKSON AXLE DESCRIPTION MATRIXSpindleHN - Tapered SpindleHP - Parallel Spindle (Pro-Par Type)HPX - Parallel Spindle Cross-drillP90 - HUS Unitized

Axle TypeS - StraightU - BentC - CamberedH - Half / Stub

Tube Size50 - 5" Round56 - 5-3/4" Round

Tube Wall4 - 1/2" Nominal5 - 5/8" NominalH - 5/8" (Heavy Duty)6 - 3/4" 0 - Solid Bar

Tire InflationT - TIREMAAX® or TIMSP - MTIS / PSI PreppedV - Axle Vent Only3 - 3-Hole Prep OnlyM - Military Set-up- (Dash) - None

Axle Track### - Track Length (inches) 1st 3Digits# - Track Length (1/8") 4th Digit

Auto LubeL - Lube System - Fittings Installed- (Dash) - None

Spider TypeB - Bolt-on SpiderF - Flange OnlyW - Weld-on SpiderT - Torque Plate for Air Disc Brake- (Dash) - No Spider / No S-Cams

Brake TypeB - B-LockS - Single Anchor Pin (SAP) Service

Only F - Std. Service - Dual Anchor Pin

(DAP) - BSFB brandP - Pin Style - BSFB brandX - HXS / XLII - Dual Anchor Pin

(DAP) - BSFB brandD - Air Disc Brake- (Dash) - No Brake ShoesH - Hendrickson Std. Service - Dual

Anchor Pin (DAP)N - Hendrickson Pin StyleE - Hendrickson HXS (DAP)C - Cams Only, No Brake Shoes

Brake Size1250 - 121/4" × 5" brakes1254 - 121/4" × 51/2" brakes1274 - 121/4" × 71/2" brakes1585 - 15" × 85/8" brakes1650 - 161/2" × 5" brakes1670 - 161/2" × 7" brakes1685 - 161/2" × 85/8" brakes1610 - 161/2" × 10" brakes1870 - 18" × 7" brakes2080 - 20" × 8" brakes430_ - 430mm Air Disc16N_ - 161/2" Spider only15N_ - 15" Spider only12N_ - 121/4" Spider only---- (4 Dashes) - No Brakes

Cam LengthS - Standard. Short Length (175/8")M - Standard. Medium Length (205/8")L - Standard. Long Length (233/4")X - Special Length (Non-Standard.)- (Dash) - No S-Cams

Cam OptionC - Cam TubeB - RM Cartridge Bushing- (Dash) - No Special Cam Options

ABS OptionB - ABS Mounting Bracket OnlyS - ABS Sensor Installed- (Dash) - No ABS Sensors / Brackets

Brake AdjustersB - BendixG - GuniteH - Haldex- (Dash) - No Brake AdjustersChambersB - BendixH - HaldexM - MGMK - Knorr - Air Disc Brake OnlyT - TSE- (Dash) - No Chambers

READY TO ROLL® (RTR®) Packages1 - 10-stud, hub-piloted - 1st Digit6 - 6-stud, hub-piloted - 1st Digit8 - 8-stud, hub-piloted - 1st Digit- (Dash) - No Hubs - 1st Digit

V - HVS 3-yr - 2nd DigitL - HLS 5-yr - 2nd Digit7 - HXL7 7-yr - 2nd DigitU - HUS 7-yr - 2nd DigitP - ConMet PreSet - 2nd Digit- (Dash) - No RTR or 1-yr Std Service- 2nd Digit

C - Cast Drum - 3rd DigitF - Fused Drum - 3rd Digit- (Dash) - No Drums - 3rd Digit315 - 3-spoke, 15" wheel - all 3Digits520 - 5-spoke, 20" wheel - all 3Digits622 - 6-spoke, 22" wheel - all 3Digits624 - 6-spoke, 24" wheel - all 3Digits

RTR LubeG - GreaseF - Syn. Semi-Fluid GreaseO - 80W - 90 OilS - SAE 50 or 75W - 90 Synthetic- (Dash) - None

Dust ShieldsD - Dust Shield Included- (Dash) - None

AXLE BEAM CAPACITIES Table A

SPIN

DLE

TY

PESP

IND

LE G

RAPH

ICRE

CO

MM

END

EDAX

LE U

SEAP

PLIC

ATIO

NSU

SPEN

SIO

NAX

LED

IAM

ETER

1/2”

NO

M.

WAL

L5/

8” N

OM

.W

ALL

5/8”

H

D

WAL

L

3/4”

W

ALL

SOLI

DBA

R

HN

(D

22)

On

/ Off

Hw

yD

ry V

an, R

eefe

rs, V

ocat

iona

l (Fl

ats,

Dum

ps, A

utoh

aule

rs, T

anks

, Low

boys

)

Mec

hani

cal S

prin

g5"

roun

dUp

to 2

2,50

0Up

to 2

5,00

0Up

to 2

5,40

0Up

to 2

7,00

0N

/A

Air R

ide

5" ro

und

Not

allo

wed

Up to

22,

500

Up to

23,

000

Up to

25,

000

N/A

HP

(P22

)O

n / O

ff H

wy

Dry

Van

, Ree

fers

, Voc

atio

nal (

Flat

s, D

umps

,Au

toha

uler

s, T

anks

, Low

boys

), s

uper

sing

les

w/ o

ffset

whe

els

Mec

hani

cal S

prin

g 5"

roun

dUp

to 2

2,50

0Up

to 2

5,00

0Up

to 2

5,40

0Up

to 2

7,00

0N

/A

Air R

ide

5" ro

und

Not

allo

wed

Up to

22,

500

Up to

23,

000

Up to

25,

000

N/A

K22

On

/ Off

Hw

yH

eavy

Hau

l, Tr

unni

on A

pplic

atio

ns,

typi

cally

ver

y lo

ng tr

ack

or v

ery

shor

t tra

ckle

ngth

s

Mec

hani

cal S

prin

g5"

roun

dUp

to 2

2,50

0Up

to 2

5,00

0Up

to 2

5,40

0Up

to 2

7,00

0N

/A

Air R

ide

5" ro

und

Not

allo

wed

Up to

22,

500

Up to

23,

000

Up to

25,

000

N/A

Wal

king

bea

m5"

roun

dUp

to 2

2,50

0Up

to 2

5,00

0Up

to 2

5,40

0Up

to 2

7,00

0N

/A

Trun

nion

5" ro

und

Up to

22,

500

Up to

25,

000

Up to

25,

400

Up to

27,

000

N/A

K30

On

/ Off

Hw

yM

inin

g, O

il Fi

eld,

Log

ging

, O

ff-Ro

ad

Mec

hani

cal S

prin

gLD

AN

/AN

/AUp

to 3

0,00

0N

/AN

/A

Air R

ide

LDA

N/A

N/A

Up to

27,

000

N/A

N/A

Wal

king

bea

mLD

AN

/AN

/AUp

to 3

0,00

0N

/AN

/A

A45

/ A65

On

/ Off

Hw

yM

inin

g, O

il Fi

eld,

Low

Spe

ed T

rans

port

(Ste

el y

ards

, Mar

inas

, etc

.)

Mec

hani

cal

Sprin

g, W

alki

ngBe

am, S

olid

Mou

nt

LDA

/ Sol

id

LDA

/ Sol

id

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

Up to

45,0

00

Up to

65,0

00

T24

On

Hw

yLi

ft ax

les

on T

ruck

App

licat

ions

Mec

hani

cal S

prin

g 5"

roun

dUp

to 2

2,50

0Up

to 2

5,00

0Up

to 2

5,40

0N

/AN

/A

Air R

ide

5" ro

und

Not

allo

wed

Up to

22,

500

Up to

23,

000

N/A

N/A

D10

On

Hw

yLi

ft Su

spen

sion

s fo

r Pus

her a

nd T

ag A

xles

(Sin

gle

Whe

el)

Mec

hani

cal S

prin

g 5"

roun

d10

,000

to 1

2,00

0- b

ased

on

Whe

el E

ndN

/A

Air R

ide

5" ro

und

N/A

BEN

TO

n H

wy

Liqu

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11L980 B

A65

A45

AXLEMODEL

BEARINGSURFACE

INDUSTRY STANDARD

NUMBER CUP

INDUSTRY STANDARD

NUMBER CONE

OVERALLWIDTH(in.)

OUTERDIAMETER

(in.)

INSIDE BORE(in.)

A45Inner 772 787 1.875 7.125 4.125

Outer 6535 6580 2.125 6.375 3.500

A65Inner 892 896 2.250 9.000 5.375

Outer 6535 6580 2.125 6.375 3.500

D10Inner 28920 28995 1.000 4.000 2.470

Outer 25523 25580 1.063 3.625 1.750

HN (D22)

K22, S22

Inner HM218210 HM218248 1.575 5.787 3.542

Outer HM212011 HM212049 1.500 4.813 2.625

HP (P22)Inner HM518410 HM518445 1.563 6.000 3.501

Outer HM518410 HM518445 1.563 6.000 3.501

K30, S30Inner 752 759 1.875 6.375 3.500

Outer 742 740 1.750 5.909 3.188

T24Inner 592A 594A 1.563 6.000 3.750

Outer 572 580 1.438 5.512 3.250


12L980 B

BEARING INFORMATION

The table shown below provides a summary of the bearings used on Hendrickson trailer axles.Information also included in this table are bearingindustry standard numbers and dimensional information.

Table B


13L980 B

BRAKE SETUP CONFIGURATIONS

A typical trailer axle is set up so that the horizontalaxis passing through the axle assembly will alsopass through the centerline of the brake cam. In atypical setup (figure 4 and 5), the brake cams areset to the front or rear of the axle with the slackadjuster pointed up away from the road for “CamForward Orientation” (figure 5) or down towards the road for "Cam Rearward Orientation" (figure 4). Using these two orientations allows the cam to rotate (open) in the same direction of travel as thetires. Using an opposite orientation (i.e. cams to the rear with the slacks pointing up away from theroad) causes the cam to open against the rotation of the tires. This condition is known as “cam opposite,” or “reverse cam rotation.” For more information on reverse cam rotation, refer to the “cam same vs. cam opposite” section of this guideline.

The use of different types of suspensions sometimesrequire that the brake cams, air chambers, etc. belocated in a position off the horizontal centerline ofthe axle. For straight axles, the axle can be clockedto any position within 10 degrees of the horizontalcenterline (figure 6). Drop center axles and axleswith tire inflation systems require the customer tospecify the orientation of the drop center portion of the axle as well as the orientation of the brake cam.

Cam rearward (air under)

Vehicle Front

figure 4

Cam Forward (Air Over)figure 5

10

figure 6


14L980 B

VALUE ADDED OPTIONS

Hendrickson Trailer Suspension Systems works closely with fleets and trailer manufacturers to create products that offer versatility in application,added reliability and reduced costs. These valueadded options are enhanced design features whichreduce life cycle costs.

WHEEL END OFFERINGS

Hendrickson Trailer Suspension Systems offers a variety of wheel-ends to fit your needs.

— Hendrickson Long-life System™ (HLS™) usessemi-fluid grease and comes with a five-yearlimited warranty

— Hendrickson Value System™ (HVS™) uses an oil bath method and comes with a three-year limited warranty

— Hendrickson also offers a ConMet® Preset Hubon their trailer axles to provide extra versatilityin their wheel-end offerings.

TIREMAAX® TIRE INFLATION SYSTEMS

Hendrickson offers two TIREMAAX tire inflation systems to suit your tire inflation needs.

TIREMAAX CP – Constant pressure controlled by regulator

TIREMAAX EC – Controlled by an electronic ECU

TIRE INFLATION PREP

Hendrickson trailer axles can be prepped for use with tire inflation systems. Axle spindles come without plugs installed and axles are pre-drilled to accept the hardware and fittings of various systems offered. Please check with your CSR foravailable system preps.

CAM TUBES

Cam tubes cover the brake camshaft from the brakespider to the cam support bracket and are filled withgrease. Cam tubes often extend the life of seals andbushings used on trailer axle brake spiders and cambrackets, as well as, reducing vibration in the axles.Cam tubes are particularly popular in the NorthernUnited States and Canada where they are used tohelp keep road salts and other chemicals from getting to the bushings and seals.

EXTENDED SERVICE BRAKES (HXS®)

Extended service brakes (HXS®) are available to help extend life before your first brake job.

ABS

Since January 1998, the U.S. Government has ma ndated anti-lock brake systems on new semi-trailers. Hendrickson offers trailer axles with ABSmounting brackets, ABS tone ring hubs and ABS sensor leads.


15L980 B

GROSS AXLE WEIGHT RATING AND AXLE BEAM RATING

GROSS AXLE WEIGHT RATING

This section will help vehicle manufacturers determine the load carrying capacity of aHendrickson trailer axle with easy to use reference charts, as well as explaining how the axle weight rating is determined. The gross axleweight rating (GAWR) is the load carrying capacity of an axle and is determined by the lowest ratedcomponent in the assembly.

If you are unsure how to use the charts in this section, or your axle is not included in the charts,contact Hendrickson. To obtain a written applicationapproval of a GAWR, a request can be submitted via the Internet at www.hendrickson-intl.com. An axle rating provided by Hendrickson will only coverthe axle beam and brake system, as these are thecomponents that Hendrickson manufacturers. Anycomponents not manufactured by Hendrickson suchas wheel ends, tires, vehicle, etc. should have ratingsprovided by the component or vehicle manufacturer.

AXLE BEAM RATING

The axle beam ratings provided in this book are the load carrying capacity of the axle tube and spindleassembly only and are based on several different factors. Suspension type and suspension mounting centers; axle wall thickness and track; wheel type(dual or single), and offset dimension for a singlewheel application are required.

DIMENSIONAL REQUIREMENTS FOR AXLEBEAM RATING

SUSPENSION TYPE AND SUSPENSION MOUNTINGCENTERS

It is important to understand the difference betweenmechanical spring centers or air suspension beamcenters and vehicle frame centers as many peopleconfuse these dimensions. The mechanical springcenters distance is the distance from the centerline of the mechanical spring to the centerline of the other mechanical spring (figure 7).

figure 7

In air suspensions applications the “air suspensionbeam centers” are defined as distance from the centerline of the axle connection to the other centerline of the axle connection (as shown in figure 8).

Vehicle frame centers relate to the frame, or chassisof the vehicle and not to the mechanical spring centers or air ride beam centers. It is important toprovide the correct dimension when requesting a rating for a Hendrickson Trailer Axle.

WALL THICKNESS

Standard trailer axle product offerings are available with nominal wall thicknesses of ½ , 5/8 and true / full wall thicknesses of 5/8 and ¾inches.

NOTE: The ½ inch nominal wall thickness trailer axleis approved for mechanical springsuspensions only.


16L980 B

AXLE TRACK

For dual wheels, track is measured from center tocenter of the dual wheel set-up. For axles using single tires with a zero offset wheel, track is measured from the center of the tire or wheel to the center of the other tire or wheel.(figure 10)

If the application uses a single wheel that is eitherinset or outset the rating is affected. The effects aredescribed in detail later in “Beam Rating ChartsSingle Offset Wheels.”

Wall Thickness

figure 9

figure 10

figure 8

Track

BeamCenters

Air SpringCenters

Air Spring


17L980 B

BEAM RATING - SUPER SINGLE OFFSETTIRES

The use of offset tires can affect the axle rating. Forapplications where dual offset wheels are utilized oran application that uses a zero offset super-singletire, the axle rating will not be affected. However, the use of an outset or inset super-single tire doeschange the way in which the axle is loaded andtherefore affects how the axle will be rated.

Inset super-single tires move the point at which the axle is loaded inboard towards the center of thevehicle. Using this type of wheel will not affect theaxle beam rating, but can significantly reduce the life of the outer bearing. To determine the effect thatthis will have on a particular axle application, contact Hendrickson.

The use of a super-single outset tire configurationmoves the load point out away from the center of thevehicle, which increases the bending load in the axleand also decreases the bearing life. To determine therating for an axle that uses an outset wheel, contactHendrickson engineering for assistance.

NOTE: Outset single wheel – Max allowable outset is 2 inches and outset applications must usea HP (P22) spindle. Offset (outset) wheels are not approved on HN (D22) spindleapplications.

OUTSET SINGLE WHEEL DUAL OFFSET WHEELS

INSET SINGLE WHEEL ZERO OFFSET SUPER SINGLE WHEEL

figure 11

Brake Drum (ref) Brake Drum (ref)

Brake Drum (ref)

Brake Drum (ref)

AXLE BEAM RATING - STRAIGHT AXLES

The charts at the end of this section should be usedto determine an axle beam rating for Straight AxlesOnly, assuming a particular suspension mountingcenter dimension. The graph provides ratings for HN (D22), HP (P22) and T24 model axles in allavailable wall thickness for use in a mechanicalspring or air suspensions.

In order to use the graph, the following is needed:

• Axle wall thickness

• Nominal axle rating

• Suspension mounting centers

• Air spring centers (air suspension only)

• Suspension pivot to axle center (air suspension only)

• Suspension pivot to air spring center (air suspension only)

• Axle overhang

With all of this information, the axle beam rating caneasily be determined from the beam rating graph tofollow.

NOMINAL BEAM RATINGS

For the purposes of calculating straight axle beamratings, the nominal axle ratings are as follows:


18L980 B

Table C

Nominal Axle Ratings1/2" Wall 22,500 lbs5/8" Wall 25,000 lbs3/4" Wall 27,000 lbs


19L980 B

MECHANICAL SPRING SUSPENSIONS

To calculate the axle beam rating on mechanicalspring suspension, use the following technique:

1. Determine the axles nominal rating from (TABLE C on page 18).

2. Determine the suspension mounting centers. Fora mechanical spring suspension, the suspensionmounting centers are equal to the spring centers.

3. Determine the axle track.4. Determine the axle overhang by subtracting the

mounting centers from the axle track anddividing by two.

5. Refer to the “Hendrickson Trailer Axle BeamRatings” graph to determine the percentage ofnominal rating (page 22).

6. Multiply the axle nominal rating by the percent of nominal rating.

EXAMPLE 1 To find the axle beam rating for an application thatuses a mechanical spring suspension with an axlethat has a ½ inch wall thickness and a 711/2-inchtrack length with suspension mounting centers of341/2 inches. Axle beam rating can be determined as follows:

1. Nominal rating 1/2 inch wall axle = 22,500pounds

2. Suspension mounting centers = 341/2 inches3. Axle track = 711/2 inches4. Axle Overhang = 1/2 x (711/2 - 341/2) = 181/2

inches5. From graph, percent of nominal rating =

95 percent6. Axle beam rating = 22,500 x (.95) = 21,375

pounds

EXAMPLE 2To find the axle beam ratings for an application thatuses a mechanical spring suspension with an axlethat has a 5/8 inch wall thickness and a 711/2 inchtrack length with suspension mounting centers of 37 inches. Axle beam rating can be determined as follows:

1 - Nominal rating 5/8 inch inches wall axle =25,000 pounds

2 - Suspension mounting centers = 37 inches3 - Axle track = 711/2 inches4 - Axle overhang = 1/2 x (711/2 - 37) = 171/4 inches5 - From graph, percent of nominal rating =

100 percent6 - Axle beam rating = 25,000 x (1) = 25,000

pounds

EXAMPLE 1

To find the axle beam ratings for an application thatuses an air suspension with an axle that has a 5/8

inch wall thickness and a 711/2 inch track length with front mounting centers of 35 inches, rear mounting centers of 30 inches, B = 20 inches and C = 35 inches. Axle beam rating can be determinedas follows:

1. Nominal rating 5/8 inch wall axle = 25,000pounds.

2. Calculate dimension A

3. Calculate dimension D = (20/35) × 2.5 = 1.43inches

4. Calculate effective beam centers = 35 - (1.43 ×2) = 32.14 inches

5. Axle overhang = 1/2 × (71.5 - 32.14) = 19.68inches

6. Refer to the “Hendrickson Trailer Axle BeamRatings” graph to determine the percentage ofnominal rating (page 22)

7. Multiply the axle nominal rating by the percent of nominal rating

NOTE: The use of trailer axles with a 1/2 inch nominalwall thickness in air suspensions requiresapproval from Hendrickson applicationengineering.

NOTE: The graphs on the following page for axlebeam ratings assume the axle uses standarddual offset wheels, or single wheels with nooffset and are for on-highway applicationsonly.

AIR RIDE SUSPENSIONS

For air suspensions, axle ratings are based on thelocation of the suspension attachment relative to theaxle spindles. The suspension location is defined asthe effective suspension centers.

The effective suspension centers are determined usingthe front and rear suspension mounting locations to determine where the effective suspension centercrosses the axle center (figure 12).

To calculate the axle beam rating on an air suspension, use the following technique:(Refer to figure 12)

1. Determine the Nominal Rating

2. Calculate dimension A

3. Calculate dimension D

4. Calculate efffective beam centers

5. Calculate the overhang = 1/2 × (track - effectivebeam centers)

6. Refer to the “Hendrickson Trailer Axle BeamRating graph to determine the percentage ofnominal ratings” (Refer to figure 13 on page 22)

7. Multiply the axle nominal rating by the percent ofnominal rating


20L980 B

[ ]Front RearMounting - MountingCenters Centers

× 1/ 2 = A

(B / C) × A = D

FrontMountingCenters

- (D × 2) = EFFECTIVE

BEAMCENTERS

[ ]35 - 30 × 1/ 2 = 2.5 inches


21L980 B

REARMOUNTINGCENTERS

EFFECTIVE BEAM

CENTERS

FRONTMOUNTINGCENTERS

AXLE CENTER

A

D

B

C

AIR SUSPENSION DIAGRAM

figure 12


22L980 B

HENDRICKSON TRAILER AXLE BEAM RATINGS

FOR AXLES UTILIZING HN, HP AND T24 SPINDLES

FOR D10, K30, A45 AND A65 WITH MECHANICAL SPRING SUSPENSIONS

AXLE MODEL

STANDARD TRACK LENGTH

(inches)

SPRING CENTERS(inches)

BEAM RATING(lbs.)

D10 74 48 12,000

K30 71 38 30,000

A45 86 48 45,000

A65 88 50 65,000

100%

98%

96%

94%

92%

90%

88%

86%

84%

82%

80%

78%

76%

74%

72%

70%

68%

66%

64%

62%

60%

58%

16.5

17.0

17.5

18.0

18.5

19.0

19.5

20.0

20.5

21.0

21.5

22.0

22.5

23.0

23.5

24.0

24.5

25.0

25.5

26.0

26.5

27.0

27.5

28.0

28.5

Axle Overhang (inches)figure 13

Table D


23L980 B

AXLE BEAM RATING – DROP CENTER AXLES

The charts at the end of this section should be usedto determine an axle beam rating for drop–centeraxles only. The graph provides ratings for HN, HPand T24 model axles in all available wall thicknessfor use in a mechanical spring or air suspensions. In order to use these graphs the following is needed:

• Axle wall thickness

• Suspension mounting centers

• Axle overhang

With this information, the axle beam rating can easilybe selected from the appropriate graph.

To calculate the axle beam rating for a drop–centeraxle, use the following technique:

1. Determine the axle wall thickness.

2. Determine the suspension mounting centers.

3. Determine the axle track.

4. Determined the axle overhang by subtracting the mounting centers from the axle track anddividing by two.

5. Refer to the “Hendrickson Trailer Drop – centerAxle Beam Ratings” graph to determine the axlerating A (figure 14 on page 24).

EXAMPLE 1

To fine the axle beam ratings for an application thatuses a mechanical spring suspension with an axlethat had a 5/8 inch wall thickness and a 711/2 inchtrack length with suspension mounting centers of341/2 inches. Axle beam rating can be determined asfollows:

1 - Axle wall = 5/8 inch2 - Suspension mounting centers = 341/2 inches3 - Axle track = 711/2 inches4 - Axle overhang = 1/2 x (711/2 - 341/2) = 181/2

inches5 - Axle beam rating = 20,000 pounds


24L980 B

HENDRICKSON DROP CENTER AXLE BEAM RATINGS

FOR HN (D22), HP (P22) AND T24 WITHMECHANICAL OR AIR RIDE SUSPENSIONS

Axle Overhang (in)5/8 inch Wall–Air Suspension3/4 inch Wall–Spring5/8 inch Wall–Spring 3/4 inch Wall–Air Suspension

figure 14


25L980 B

S-CAMS AND BRAKES

SERVICE BRAKE REQUIREMENTS

Hendrickson offers a variety of sizes and models ofbrakes. Federal law requires all brakes / axles meetthe performance standard set by FMVSS-121 regulation. FMVSS-121 is applicable to vehicles that travel more than 55 MPH and brakes that are rated less than 29,000 pounds.

Canadian law requires brakes meet CMVSS-121.CMVSS-121 requires that all brakes meet a draw bar requirement. If a trailer brake assembly will beused in Canada, it must meet Canadian draw barcertification requirements.

The original equipment manufacturer (OEM) has the responsibility of ensuring that their trailers meet the certification requirements. For additionalinformation regarding brake certifications contactHendrickson engineering.

The following section is to be used to aid in theselection of the appropriate brake for the application.Each brake approval shown is based on gross axleweight rating (GAWR), static loaded radius (SLR), air chamber size, brake adjuster length (S-cam brake only) and the brake lining material.

BRAKE TYPE

Hendrickson Trailer Axles can be ordered with double anchor pin (DAP) S-cam drum brakes, or air disc brakes. Each of these brakes can be configured to meet a variety of performance andpackaging considerations (figure 15).

Double Anchor Pin Drum Brake Assembly (DAP) Air Disc Brake Assembly (ADB)

figure 15


26L980 B

CAM SAME VS. CAM OPPOSITE

To ensure safe operation and maximum durability ofparts such as brake linings and tires, it is necessaryto position and install the axle with the proper camrotation. It is required that the axle assembly beinstalled so that in the forward direction of the vehiclethe cams rotate in the same direction as the wheels.When the brake is installed in this configuration it isknown as “cam same.” When the wheel rotation isopposite of the cam rotation, the brake is considered“cam opposite.” Examples of “cam same” are shownbelow (figure 16).

Installation in which the camshaft rotation is oppositeof wheel rotation can cause brake noise, chatter andwheel “hop.” Only “cam same” installations meet therequirements of these guidelines. However, somesuspension systems do not have enough clearanceto allow the axle to be mounted with “cam same.”Approval for “cam opposite” uses is rarely granted,but may be requested on an individual basis by submitting a Hendrickson Trailer Spec Form toHendrickson engineering.

Failure to obtain application approval or the use of Hendrickson brakes or their components in non-approved applications will void Hendrickson'swarranty coverage.

Cam Rotation

Wheel Rotation

Cam Rotation

Wheel RotationEXAMPLES OF “CAM SAME”

figure 16


27L980 B

AXLE STRUCTURAL RATING VS. BRAKEPERFORMANCE RATING

The axle beam rating considers the structural strength of the axle and is essentially the load carrying capability of the axle. Specifically, it is howmuch weight the axle can carry (as shown below).

The brake rating is the maximum load the brake iscapable of stopping, while meeting FMVSS-121requirements. In short, it is the stopping power. Brakerating is dependent on brake size, lining type, brakepower and tire static loaded radius (as shown belowin figure 17).

The gross axle weight rating (GAWR) must be thevalue of the lowest rated component of the axleassembly. This includes all weight rated componentsof the axle such as the brake components, brake lining, tires, hubs and drums. It is common practiceto have an axle with an axle beam rating at 23,000pounds used in conjunction with a brake configuration with a brake rating at 20,000 pounds. In this case, the GAWR would be that of the lowest rated component or 20,000 pounds.

Axle Beam Rating – Load carrying

Brake Rating – Stopping power

figure 17


28L980 B

S-CAM DRUM BRAKE RATINGS

The performance of a S-cam drum brake is determined by the brake diameter, brake width, input torque, lining type and the static loaded radiusof the tire. The nomenclature used to identify the sizeof the brake is to specify the diameter of the brake bythe width of the brake. For example, a 16.5x7 brakerefers to a 16.5-inch diameter brake that has a widthof 7 inches. As shown in the figure below. Brake certification is available from Hendrickson engineering.

Brake Drum

Brake Lining

Width

Diameter

figure 18


29L980 B

BRAKE CHAMBER BRACKETS ANDSLACK ADJUSTER CLEARANCE

Hendrickson has two styles of brake chamber brackets:standard and high rise (figure 19). Slack selectiondepends on the brake chamber bracket selected. On12¼ inch brakes, if you select the standard or highrise brake chamber bracket, you must get curvedslacks for adequate clearance between the slackbody and axle tube.

figure 19

110°

88°

High Rise Brake Chamber Bracket Standard Brake Chamber Bracket

Tube

Tube

Curved Slack

Slack 30/30

Slack Type 30 Only

www.hendrickson-intl.com

Information contained in this literature was accurate at the time of publication. Product changes may have been made after the copyright date that are not reflected.© 2011 Hendrickson USA, L.L.C. (U.S. Rights) Hendrickson International Corporation (Rights Outside U.S.) All Rights ReservedL980 Rev B 08-11

Trailer Commercial Vehicle Systems250 Chrysler Drive, Unit #3Brampton, ON Canada L6S 6B6 905.789.1030Fax 905.789.1033

Hendrickson MexicanaAv. Industria Automotriz #200Parque Industrial Stiva AeropuertoApodaca, N.L., México C.P. 66600 +52 (81) 8288.1300Fax +52 (81) 8288.1301

Trailer Commercial Vehicle Systems2070 Industrial Place SECanton, OH 44707-2641 USA

866.RIDEAIR (743.3247)330.489.0045Fax 800.696.4416

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