Torsional Catalog

User Manual: TorsionalCatalog

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In This Section:

■■Selection■Process

■■L-LOC■Clamping■Feature

■■LF■Series

■■LVK■Series

■■LV■Series

■■LM■Series

■■LK■Series

■■Pump■Mounting■Plates

■■Pump■Mounting■Housings

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Safety Warning

When■using■Lovejoy■products,■you■must■follow■these■instructions■and■take■the■following■precautions.■Failure■

to■do■so■may■cause■the■power■transmission■product■to■break■and■parts■to■be■thrown■with■sufﬁcient■force■to■

cause■severe■injury■or■death.

Refer■to■this■Lovejoy■Catalog■for■proper■selection,■sizing,■horsepower,■torque■range,■and■speed■range■

of■power■transmission■products,■including■elastomeric■elements■for■couplings.■Follow■the■installation■

instructions■included■with■the■product,■and■in■the■individual■product■catalogs■for■proper■installation■of■power■

transmission■products.■Do■not■exceed■catalog■ratings.

During■start■up■and■operation■of■power■transmission■product,■avoid■sudden■shock■loads.■Coupling■assembly■

should■operate■quietly■and■smoothly.■If■coupling■assembly■vibrates■or■makes■beating■sound,■shut■down■

immediately,■and■recheck■alignment.■Shortly■after■initial■operation■and■periodically■thereafter,■where■

applicable,■inspect■coupling■assembly■for:■alignment,■wear■of■elastomeric■element,■bolt■torques,■and■ﬂexing■

elements■for■signs■of■fatigue.■Do■not■operate■coupling■assembly■if■alignment■is■improper,■or■where■applicable,■

if■elastomeric■element■is■damaged■or■worn■to■less■than■75%■of■its■original■thickness.■

Do■not■use■any■of■these■power■transmission■products■for■elevators,■man■lifts,■or■other■devices■that■carry■

people.■If■the■power■transmission■product■fails,■the■lift■device■could■fall■resulting■in■severe■injury■or■death.

For■all■power■transmission■products,■you■must■install■suitable■guards■in■accordance■with■OSHA■and■

American■Society■of■Mechanical■Engineers■Standards.■Do■not■start■power■transmission■product■before■

suitable■guards■are■in■place.■Failure■to■properly■guard■these■products■may■result■in■severe■injury■or■death■

from■personnel■contacting■moving■parts■or■from■parts■being■thrown■from■assembly■in■the■event■the■power■

transmission■product■fails.

If■you■have■any■questions,■contact■the■Lovejoy■Engineering■Department■at■1-630-852-0500.

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Table of Contents

T-3

Torsional

Overview■......................................................................................................................................262■....................... T-4

Engine■Application■■>■Selection■Process■.....................................................................................264■....................... T-6

Industrial■Application■>■Selection■Process■■..................................................................................266■....................... T-8

Applications■Service■Factors■>■Selection■Data■............................................................................267■....................... T-9

Coupling■Selection■Worksheet■■...................................................................................................268■..................... T-10

L-LOC■Clamping■Feature■and■Spline■Identiﬁcation■>■Overview■..................................................269■......................T-11

LF■Series■>■Overview■■.................................................................................................................270■..................... T-12

LF■Series■–■Elements■>■Overview■...............................................................................................271■..................... T-13

LF■Series■–■Base■Element,■Models■1,■1/S,■2■and■2/S■>■Selection■Data■......................................272■..................... T-14

LF■Series■–■Models■3,■3/S,■6,■6/S■and■6B■>■Selection■Data■■.......................................................273■..................... T-15

LF■Series■>■Performance■Data■....................................................................................................274■..................... T-16

LF■Series■–■Base■Element■and■Model■1■>■Dimensional■Data■.....................................................276■..................... T-18

LF■Series■–■Models■1/S,■2■and■2/S■>■Dimensional■Data■.............................................................277■..................... T-19

LF■Series■–■Models■3■and■3/S■>■Dimensional■Data■.....................................................................278■..................... T-20

LF■Series■–■Models■3,■3/S■and■Flywheel■Housings■>■Dimensional■Data■....................................279■..................... T-21

LF■Series■–■Models■6,■6/S■and■6B■>■Selection■Process■..............................................................280■..................... T-22

LF■Series■–■Models■6,■6/S■and■6B■>■Dimensional■Data■..............................................................281■..................... T-23

LF■Series■–■Models■6■and■6B■>■Maximum■Length■and■Speed■Data■...........................................282■..................... T-24

LF■Series■–■Weights■and■Mass■Moment■of■Inertia■.......................................................................283■..................... T-26

LF■Series■Floating-Shaft■–■Models■6■and■6B■>■Selection■Process■..............................................285■..................... T-27

LVK■Series■>■Overview■/■Performance■Data................................................................................286■..................... T-28

LVK■Series■–■SAE■J620■Flywheel■Application■>■Dimensional■Data■.............................................287■..................... T-29

LV■Series■>■Overview■/■Performance■Data■..................................................................................288■..................... T-30

LV■Series■–■SAE■J620■Flywheel■Application■>■Dimensional■Data■...............................................289■..................... T-31

LM■Series■>■Overview■.................................................................................................................290■..................... T-32

LM■Series■–■Types■SB,■SC,■SBE■and■SCE■>■Selection■Data■......................................................291■..................... T-33

LM■Series■–■Types■SB,■SCA■and■SCB■(HTR)■>■Performance■Data■............................................292■..................... T-34

LM■Series■–■Types■SB,■SCA■and■SCB■(HTR)■>■Dimensional■Data■.............................................293■..................... T-35

LM■Series■–■Types■SBE■and■SCE■(HTR)■>■Performance■Data■...................................................294■..................... T-36

LM■Series■–■Types■SBE■and■SCE■(HTR)■>■Dimensional■Data■....................................................295■..................... T-37

LK■Series■>■Overview■/■Performance■Data■■.................................................................................296■..................... T-38

LK■Series■>■Dimensional■Data■....................................................................................................297■..................... T-39

Pump■Mounting■Plates■–■SAE■J744■>■Dimensional■Data■............................................................298■..................... T-40

Pump■Mounting■Plates■–■SAE■J620■>■Dimensional■Data■............................................................299■..................... T-41

Pump■Mounting■Housings■–■Overview■........................................................................................300■..................... T-42

Running Section

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T-4

Torsional

Overview

Torsional Couplings

Lovejoy■offers■a■wide■range■of■torsional■couplings■engineered■to■solve■torsional■vibration■

problems■found■in■diesel■engine■driven■equipment■and■other■applications■where■torsional■

vibrations■are■prevalent.■■These■include■all■internal■combustion■engines,■reciprocating■

pumps■and■compressors,■as■well■as■variable■frequency■drives■(VFD).■■

Lovejoy■torsional■coupling■are■designed■to■dampen■torsional■vibrations■and■tune,■or■

adjust■the■system’s■critical■speeds■away■from■the■application’s■operating■range.■■With■

the■proper■information■(see■Torsional■Worksheet■on■page■T-10)■Lovejoy■engineers■

can■perform■a■Torsional■Vibration■Analysis,■or■TVA■for■your■application■to■assist■in■the■

selection■of■a■torsional■coupling.■See■sample■TVA■in■the■graph■to■the■right.

Lovejoy Torsional Coupling Product Overview

LF Series

The■unique■and■highly■versatile■design■of■the■elastomeric■element■makes■the■LF■Series■the■most■versatile■

product■in■Lovejoy’s■line■of■■torsional■coupling■products.■It■is■available■in■high■temperature■rubber■(HTR),■

Hytrel®,■or■Zytel®.■■The■element■can■be■easily■mounted■in■a■number■of■conﬁgurations■depending■on■the■

application.■■The■element■is■connected■axially■to■a■ﬂanged■hub,■ﬂywheel■adapter■plate,■or■ﬂywheel■on■

the■engine■side■using■axial■screws■or■special■“S”■bolts■designed■for■blind■assembly.■■The■element■is■also■

connected■to■a■cylindrical■hub■on■the■driven■equipment■side■using■radial■screws.■■This■unique■design■

is■remarkably■simple,■highly■effective■and■provides■users■of■LF■torsional■couplings■with■unmatched■

performance.■■It■is■recommended■that■coupling■selections■should■be■veriﬁed■with■a■Torsional■Vibration■

Analysis■of■the■system■(see■page■T-10).■

Conﬁguration: ■ Flange■to■shaft,■shaft■to■shaft,■and■ﬂoating■shaft■applications

Application: ■ ■The■LF■coupling■is■ideal■for■coupling■engines■to■pumps,■compressors,■generators,■

fans,■blowers,■■and■other■industrial■driven■equipment■connecting■to■either■the■

engine■ﬂywheel■or■a■power■take-off■(PTO).■

Nominal torque range (TKN): up■to■26,500■in-lb■(3000■Nm)

Max angular misalignment (Kw): HTR■up■to■3°,■Hytrel®■and■Zytel®■see■table■on■page■T-17■

Max parallel misalignment (KR):■HTR■up■to■0.08■inches■(2■mm),■Hytrel®■and■Zytel®■see■table■on■page■T-17■

Axial end ﬂoat (Ka): HTR■up■to■0.2■inches■(5■mm),■Hytrel®■and■Zytel®■see■table■on■page■T-17■

Element material:■■ HTR,■Neoprene,■Hytrel®■or■Zytel®

LVK Series

The■LVK■Series■torsional■couplings■accommodate■conﬁgurations■where■internal■combustion■engines■are■

connected■to■a■variety■of■driven■equipment,■while■protecting■the■equipment■from■potentially■damaging■

torsional■vibrations■by■tuning■engine■critical■speeds■away■from■the■application■operating■speed.■■It■is■

recommended■that■coupling■selections■should■be■veriﬁed■with■a■Torsional■Vibration■Analysis■of■the■system■

(see■page■T-10).■

Conﬁguration:■■ ■The■LVK■Style■couplings■are■designed■for■mounting■on■standard■SAE■J620■

ﬂywheels.■■The■element■is■bonded■to■the■ﬂywheel■mounting■plate■and■the■unique■

‘star’■shaped■LK■Style■hub■housing.■■The■mating■hub■mounts■onto■the■equipment■

shaft■and■slides■into■an■interlocking■position■during■installation■for■a■blind■assembly.

Application:■■ ■The■LVK■coupling■is■ideal■for■coupling■engines■to■pumps,■compressors,■generators,■

fans,■blowers■and■other■equipment■requiring■a■direct■interface■via■the■engine■

ﬂywheel.

Nominal torque range (TKN): up■to■5,800■in-lb■(655■Nm)

Max angular, parallel, and axial misalignment:■based■on■SAE■design■parameters■

Element material: ■High■Temperature■Rubber■(HTR)■or■EPDM

WARNING

You■must■refer■to■page■T-2■(Page■260)■for■Important■Safety■Instructions■and■

Precautions■for■the■selection■and■use■of■these■products.■Failure■to■follow■the■

instructions■and■precautions■can■result■in■severe■injury■or■death.

WARNING

Do■not■use■anaerobic■adhesives■with■any■

Torsional■components.

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Torsional

Overview

LV Series

The■LV■Series■torsional■couplings■provide■an■inexpensive■and■economical■alternative■for■the■agricultural■

and■off-highway■industrial■equipment■market.■■The■standard■conﬁguration■is■used■for■connecting■internal■

combustion■engines■to■a■variety■of■driven■equipment■through■a■specially■designed■plate■manufactured■

which■can■support■universal■joint■drive■shaft■systems.■■It■protects■the■equipment■from■potentially■damaging■

torsional■vibrations■by■tuning■engine■critical■speeds■away■from■the■application■operating■speed.■■It■is■highly■

recommended■that■coupling■selections■should■be■veriﬁed■with■a■Torsional■Vibration■Analysis■of■the■system■

(see■page■T-10).■

■

Conﬁguration:■ ■The■LV■Series■couplings■are■designed■for■mounting■on■standard■SAE■J620■ﬂywheels■with■

the■element■bonded■to■the■mounting■plate.■■The■face■plate■is■specially■designed■to■interface■

with■ﬂange■mounted■universal■joints■popular■in■the■agricultural■deep■well■pump■markets.

Application: ■ ■Any■diesel■engine■driven■equipment,■ﬂange■interfaces,■and■universal■joint■driveshaft■driven■

equipment.

Nominal torque range (TKN):■up■to■10,820■in-lb■(1223■Nm)

Max angular, parallel, and axial misalignment:■based■on■SAE■design■parameters■

Element material:■High■Temperature■Rubber■(HTR)■or■EPDM

LM Series

The■Lovejoy■LM■Series■torsional■couplings■are■designed■speciﬁcally■for■diesel■driven■applications■where■the■

couplings■are■ﬂywheel■mounted.■■The■LM■coupling■is■popular■in■small■to■large■equipment■conﬁgurations■where■

it■is■necessary■to■protect■the■equipment■from■potentially■damaging■torsional■vibrations.■■This■is■accomplished■

by■tuning■engine■critical■speeds■away■from■the■application■operating■speed.■■It■is■highly■recommended■that■

coupling■selections■should■be■veriﬁed■with■a■Torsional■Vibration■Analysis■of■the■system■(see■page■T-10).■

Conﬁguration: ■ ■Drive■rings■are■designed■for■many■SAE■J620■ﬂywheel■sizes■and■mount■directly■on■the■

ﬂywheel.■■The■element■and■center■hub■mount■on■the■driven■equipment■shaft■and■easily■

slide■into■the■drive■ring.■■This■coupling■is■excellent■for■normal■or■blind■installations.

Application: ■ ■Any■diesel■driven■equipment■■that■includes■generator■sets■(2■bearing),■hydraulic■pumps■

(single■or■multiple■in■parallel■or■series■conﬁgurations),■locomotive■applications,■centrifugal■

pumps,■compressors,■fans,■blowers,■and■more.

Nominal torque range (TKN):■■up■to■33,600■in-lb■(3800■Nm)

Max angular, parallel, and axial misalignment:■■based■on■SAE■design■parameters■

Element material:■HTR,■EPDM■or■Silicone

LK Series

The■LK■Series■coupling■is■a■simple■two-piece■design■consisting■of■an■ﬂywheel■or■ﬂange■mounted■element■and■

an■interlocking■hub.■■The■couplings■are■designed■for■use■with■diesel■engine■driven■hydraulic■pump■systems■

which■are■plate■mounted■directly■to■SAE■ﬂywheel■housings.■■The■couplings■are■torsionally■stiff■enabling■

hydraulic■pumps■and■similar■equipment■with■low■mass■or■inertia■to■operate■below■critical■speeds.■■The■

torsionally■stiff■LK■Series■coupling■tunes■the■engine■critical■speed■away■from■the■operating■range.■■A■Torsional■

Vibration■Analysis■is■typically■not■necessary■for■the■LK■Style■couplings■because■the■LK■Series■is■torsionally■stiff■

and■puts■the■critical■speed■above■the■normal■operating■range.■■■

Conﬁguration:■■ ■The■LK■Series■coupling■consists■of■a■ﬂywheel■mounted■element,■or■an■adapter■plate■

mounted■universal■element,■and■a■star■shaped■hub.■■The■hub■is■mounted■on■the■driven■

equipment■and■its■design■is■excellent■for■blind■installations.

Application: ■ ■The■LK■coupling’s■design■is■excellent■for■virtually■all■diesel■engine■driven■hydraulic■systems■

in■the■low■to■mid■power■range.

Nominal torque range (TKN):■■up■to■21,240■in-lb■(2400■Nm)

Max angular, parallel, and axial misalignment:■■based■on■SAE■design■parameters■

Element material:■■Zytel®

Parallel Misalignment Angular Misalignment

Torsional Misalignment Axial Misalignment

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T-6

Torsional

Engine Application

Selection Process

When■correctly■sized,■the■Lovejoy■Torsional■Coupling■will■effectively■dampen■vibration■and■tune■critical■frequencies■out■of■the■operating■range■of■

systems■driven■by■diesel,■gasoline,■or■natural■gas■reciprocating■engines.■Some■coupling■selections■can■be■veriﬁed■using■a■Torsional■Vibration■

Analysis■performed■by■Lovejoy■Engineering■(see■worksheet■page■T-10).

Misapplication of the coupling in an engine application will frequently lead to coupling

failure or system damage. Lovejoy strongly recommends that you contact Technical

Support for assistance in selecting a coupling.

Please■complete■the■information■worksheet■on■page■T-10■and■fax■it■to■800-446-0878■

or■access■“Engineering■Assistance”■on-line■at■www.lovejoy-inc.com

Use■the■following■steps■in■conjunction■with■the■technical■data■and■

dimensional■tables■contained■in■the■following■sections■to■make■the■

preliminary■coupling■selection■for■internal■combustion■engine■applications.

Step 1: Coupling Selection

Select■the■torsional■coupling■model■that■best■suits■your■drive■

arrangement.

Step 2: Application Torque

Select■a■coupling■size■with■a■nominal■torque■rating■(TKN)■greater■

or■equal■to■the■application■torque■(TLN)■calculated■with■the■

following■equation:

■ ■ TKN ≥ TLN • St

■ Provided■■TLN (in-lb) = HP • 63025 / RPM

■ ■ ■■■■■■■■■■■■or

■ ■ TLN (Nm) = HP • 9555 / RPM

St■is■the■temperature■factor■for■the■nominal■torque■found■in■

Figure■1■(page■T-9)■for■HTR.■■This■number■will■be■at■least■1.6■or■

1.7■(for■typical■ambient■temperature■of■at■least■140°■to■160°■F■

inside■the■ﬂywheel■housing).

Step 3: SAE Flywheel Size

Select■the■appropriate■SAE■J620■ﬂange■size■to■match■your■

ﬂywheel.

Step 4: Shaft Dimensions

Make■sure■the■maximum■bore■capacity■of■the■coupling■will■

accommodate■the■dimensions■of■your■drive■shaft.■■Coupling■

hub■length■can■usually■be■shortened■if■necessary■to■ﬁt■into■tight■

space■envelope.

Important:

■ ■Final■selection■of■coupling■size■requires■veriﬁcation■by■torsional■

vibration■analysis.■■This■analysis■will■identify■the■location■of■the■

critical■speeds■and■conﬁrm■the■absence■of■excessive■steady-

state■and■peak■resonance■conditions■over■the■normal■operating■

cycle■of■the■equipment.

Step 5: Peak Torque Pulses

The■magnitude■of■the■maximum■torque■pulses■that■occur■during■

operation■(Tmax)■at■all■operating■temperatures■must■not■exceed■

the■maximum■torque■rating■of■the■coupling■(TKmax).■■These■are■

short■duration■transient■pulses■that■result■from■start-up,■shock,■

or■acceleration■through■a■system■resonance■to■reach■operating■

speed.■■By■deﬁnition,■these■pulses■may■occur■over■the■life■of■the■

coupling■105■times■in■one■direction■of■rotation,■or■5■X■104■times■

reversing.

TKmax ≥ Tmax • St

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Torsional

Engine Application

Selection Process

Step 6: Critical Speeds Due to Resonance

Select■coupling■stiffness■so■the■system■does■not■run■at■high■

resonance■as■well■as■the■normal■running■and■idle■speeds■are■not■

at■or■near■critical■speeds.■■

■ ■Critical■speeds■are■related■to■the■system■natural■frequency■and■

the■number■of■pulses■or■excitations■generated■per■revolution■

i■(order).■■For■analysis,■if■possible,■reduce■the■application■to■a■

2-mass■system■and■apply■the■following■equations:

Where:

nR = ■ critical■resonance■speed■of■the■system■(RPM)

CTdyn =■■ dynamic■torsional■stiffness■of■the■coupling■(lb-in/rad)

JA =■■ mass■moment■of■inertia■for■the■drive■side■(lb-in-sec²)

JL = ■ mass■moment■of■inertia■for■the■load■side■(lb-in-sec²)

i =■■ number■of■oscillations■generated■per■revolution

■ ■The■coupling■will■be■modeled■as■the■spring■controlling■torsional■

oscillations■of■the■engine■and■ﬂywheel■on■one■side■and■the■driven■

equipment■on■the■other:

■ ■Use■the■dynamic■torsional■stiffness■values■(CTdyn)■from■the■

Performance■Data■tables■which■can■be■found■in■representative■

coupling■section.■■Mass■moment■of■inertia■values■may■

be■obtained■from■the■respective■engine■and■equipment■

manufactures.

Note:■■ n■■■System■steady-state■operating■speeds■should■be■

1.5■to■2■times■the■major■critical■speed■for■safe,■low-

resonance■operation.

Step 7: Allowable Continuous Vibratory Torque

The■amplitude■of■the■continuously■oscillating■(vibratory)■torque■

generated■in■the■system■must■not■exceed■the■coupling’s■

rating■(TKW)■at■a■particular■steady-state■frequency■(RPM)■and■

temperature.■■This■torque■is■superimposed■on■(co-exists■with)■

the■basic■load■(TLN).

TKW > TW • St • Sf •V

Where:

■TKW =■■ Coupling■rating■for■continuously■oscillating■torque■at■10Hz

■Sf =■■ ■Frequency■factor■that■relates■the■operating■frequency■to■

the■coupling’s■10Hz■rating■(see■Figure■2■on■page■T-9)

■St =■■ Temperature■factor■(for■HTR■only)

■V =■■ ■Ampliﬁng■factor■outside■the■resonance.■Substitute■Vr■for■

V■with■run-through■of■resonance■application■(see■Figure■3■

on■page■T-9)

■Tw =■■ Generating■torque

■

Operating■Frequency■f (Hz) ≤ 10 >10

Frequency■Factor■Sf1√■f■/■10

■ ■The■magnitude■of■the■continuously■oscillating■torque■generated■

in■the■system■(TW)■is■dependent■on■an■amplifying■factor■(V)■

based■on■the■system■steady-state■operating■speed■n■relative■to■

the■resonance■speed■nR:

Step 8: Dimensional & Alignment Considerations

Refer■to■the■Performance■Data■tables,■ﬁgures,■and■dimension■

tables■to■make■certain■ﬁnal■coupling■selection■meets■application■

constraints■for■the■working■envelope■(O.C.,■length,■bore■

dimensions,■etc.),■maximum■speed■limitations■and■allowable■

misalignment.

1-(n/nR)2

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T-8

Torsional

Industrial Application

Selection Process

While■the■Torsional■coupler■was■developed■to■solve■the■unique■problems■associated■with■the■torsional■vibration■in■equipment■driven■by■internal■

combustion■engines,■the■coupling■works■equally■well■in■general■industrial■applications.■For■these■electric■motor-powered■and■other■non-engine■

applications,■use■the■following■simple■selection■procedure■(Refer■to■page■T-6■for■engine-driven■applications).■

Misapplication of the coupling in an engine application will frequently lead to coupling

failure or system damage. Lovejoy strongly recommends that you contact Technical

Support for assistance in selecting a coupling.

Please■complete■the■information■worksheet■on■page■T-10■and■fax■it■to■800-446-0878■

or■access■“Engineering■Assistance”■on-line■at■www.lovejoy-inc.com

Use■the■following■steps■in■conjunction■with■the■technical■data■and■

dimensional■tables■contained■in■the■following■sections■to■make■the■

preliminary■coupling■selection■for■industrial■applications.

Step 1: Coupling Selection

Select■the■torsional■coupling■model■that■best■suits■your■drive■

arrangement.

Step 2: Choose Element Material

Most■common■used■is■the■HTR■(High■Temperature■Rubber)■

element■is■used■because■of■the■high■ﬂexibility.■■This■feature■

provides■beneﬁts■of■vibration■and■shock■damping,■noise■

silencing,■and■a■high■tolerance■for■misalignment.

■ ■When■required,■the■Zytel®■element■provides■a■torsionally■rigid■

connection■yet■is■still■ﬂexible■in■terms■of■accommodating■small■

angular■misalignment■as■well.■■Use■of■the■ﬂoating-shaft■Model■

6■version■will■allow■for■parallel■misalignment■as■well.■The■Zytel®■

material■is■also■chemical■resistant.

Please note that the optional Hytrel® element requires

almost perfect alignment which is unlikely in most

applications and is not recommended, except when used as

intended on a ﬂange mounted hydraulic pump to an engine

ﬂywheel.

Step 3: Determine Service Factor

■ ■Choose■a■representative■application■Service■Factor■(SF)■from■

the■chart■on■page■T-9.

Step 4: Calculate Nominal Torque Requirement, TKN

Use■the■actual■torque■or■horsepower■requirement■for■the■

driven■equipment■if■known.■■Otherwise,■use■the■rated■motor■

horsepower.

TKN (in-lb) ≥ HP•SF•63025 / RPM

■

Step 5: Other Considerations

Refer■to■the■Performance■Data■tables,■ﬁgures,■and■dimension■

tables■to■make■certain■ﬁnal■coupling■selection■meets■application■

constraints■for■envelope■(O.D.,■length,■bore■dimensions,■etc.)■

and■maximum■speed■limitations.

■ ■Example:

■ ■Find■a■LF■coupling■for■a■15■hp■centrifugal■pump■running■at■

1,750■RPM.

■Model 2■–■Most■common■for■shaft-to-shaft■applications.

Model 2/S■–■For■shaft-to-shaft■applications■that■require■free■end-

ﬂoat■or■quick,■blind■“plug-in”■assembly.

Model 1 or 1/S■–■or■connecting■a■shaft■to■a■ﬂange■or■ﬂywheel.

Model 6■–■ﬂoating■shaft■applications■(see■pages■T-22■through■

T-25).

■ SF■=■1.0■(from■Application■Service■Factor■(SF)■on■page■T-9)

■ TKN■=■(15hp•1.0•63025)■/■1,750■RPM■=■540■in-lb

■ »■use■a■LF8■torsional■coupler■or■larger

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Torsional

Application Service Factors

Selection Data

Application Service Factors

Agitators■.........................1.0

Beaters■..........................1.5

Blowers■..........................1.0-1.25

Can■ﬁlling■machinery■. . . . . . . . . . . . . . . .1.0

Car■dumpers■......................2.5

Car■pullers■........................1.5

Compressors■(screw) ■. . . . . . . . . . . . . . .1.0

Compressors■(reciprocating)■. . . . . . . . . . Consult■Lovejoy

Conveyors■........................1.0-2.5

Love■Roll,■Shaker■&■Recip.■. . . . . . . . . . .3.0

Conveyors■(heavy■duty) ■. . . . . . . . . . . . .1.25-2.5

Cranes■&■Hoists1■...................2.0

Crushers■.........................3.0

Dredges■..........................1.5-2.0

Elevators■.........................1.0

Fans.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.■.1.0-1.5

Feeders■..........................1.0

■ Reciprocating■. . . . . . . . . . . . . . . . . .2.5

Generators:

■ Not■Welding■...................1.0

■ Welding■.......................2.0

■ Hoist■.........................1.5

Hammer■mills■.....................2.0

Kilns■.............................1.5

Laundry■washers:

■ Reversing■.....................2.0

Line■shafting■......................1.5

Lumber■machinery■. . . . . . . . . . . . . . . . . . 2.0

Machine■tools ■. . . . . . . . . . . . . . . . . . . . .1.5-2.0

Metal■forming■machinery■. . . . . . . . . . . . .1.5-2.5

Mills,■rotary■type ■. . . . . . . . . . . . . . . . . . .2.0

Mixers■...........................1.5-1.8

Paper■mill■equipment■. . . . . . . . . . . . . . . . 1.2-2.0

Pumps:

■ Centrifugal■....................1.0

■ Gear,■Rotary■or■Vane■. . . . . . . . . . . . 1.25

■ Reciprocating■1■Cyl.■. . . . . . . . . . . . .2.0

■ Or■double■acting

■ 2■Cyl.■Single■Acting■. . . . . . . . . . . . . .2.0

■ 2■Cyl.■Double■Acting■. . . . . . . . . . . . . 1.75

■ 3■or■more■Cyl.■. . . . . . . . . . . . . . . . . .1.5

Rubber■machinery■. . . . . . . . . . . . . . . . . . 2.0-2.5

Stokers■..........................1.0

Textile■machinery■. . . . . . . . . . . . . . . . . . .1.2

Windlass■.........................2.0

Woodworking■machinery■. . . . . . . . . . . . .1.0

Figure 1: Temperature Factor*, St (HTR)

Figure 2: Frequency Factor

Operating■Frequency■f (Hz) ≤ 10 > 10

Frequency■Factor■Sf1√■f■/■10

Figure 3: Resonance Factor Vr

Coupling Element VrΨ

HTR■50■Shore 10 0.6

HTR■60■Shore 8 0.78

Hytrel®– 0.5

Zytel®– 0.4

Figure 4: Permissible Misalignment vs. Speed

Oils & Hydraulic Fluids Hytrel®Zytel®Solvents & Fuels Hytrel®Zytel®Acids & Bases Hytrel®Zytel®Miscellaneous Hytrel®Zytel®

Automatic■Transmissions A A Gasoline A A Sulfuric■Acid■(20%) A C Ethylene■Glycol* A A,B

Fluid■Type■A■&■F■ A A Nujol,■JP4■Kerosene A A Hydrochloric■Acid■(20%) B C Steam B B

Hydraulic■Fluid A A Halocarbons,■Freon A A Potassium■or■Sodium — — Liquid■Ammonia — A

Phosophate■Ester A A Trichlorethylene C C Hydroxide■(20%) A B — — —

Lube■Oil A A Carbon■Tetrachloride B A — — — — — —

Chemical Resistance Chart

Notes:■■ n■■■Avoid■contact■with■hydrocarbon■base■lubricants■or■use■of■any■anaerobic■adhesives.

■n■■■A■indicates:■Little■or■no■effect.

■n■■■B■indicates:■Moderate■effect.

■n■■C■indicates:■Severe■effect.

Note:■■ n■■HTR■is■High■Temperature■Rubber.

Note:■■ n■■■1■indicates:■If■people■are■transported,■Lovejoy■does■

not■recommend■and■will■not■warranty■the■use■of■the■

coupling.

Permissible Misalignment vs. Speed

1000

2000

3000

4000

5000

0 50 100 150

Percent of Rating for Allowable

Misalignment at TKN

Operating Speed

HTR (Angular &

Parallel)

Zytel (Angular)

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Driven Equipment

o■Hydraulic■Pump■ Shaft■Diameter■or■Spline■details■ Driven■From:

o■Water■Pump■ ___________________________■ o Flywheel

o Compressor■■Type:______________■ ___________________________■ o Front■/■Side■PTO

■■■■■■■■■■(Screw,■Reciprocating,■Lobe■Etc)

■ ■ o Other■(Explain)

o Generator■/■Alternator■ Type■of■Equipment■Mounting■ ____________________________

■ ■

o Other:■■_________________________■■ o Flange■mount■to■engine■pilot■ ____________________________

■ ■ ■ ■ ■ ■

Ambient■Operating■Temperature:■______■°F■/■°C■■■■■ o Independent■of■engine

Customer Information ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■Date:■ __________________________________________

Company■Name:■_______________________________________________________■■Contact■Name:_____________________________________________

Phone■Number:■________________________________________________________■■email■address:■_____________________________________________

Fax■Number:■__________________________________________________________■■Anticipated■Order■Quantity■/■Annual■Usage:■______________________

Brief■Description■of■Application:■______________________________________________________________________________________________________

_______________________________________________________________________________________________________________________________

Engine Information■ Type:■ Piston■conﬁguration

Engine■Manufacturer:__________________________________________■ o Diesel■ o■In-Line

Engine■Model:________________________________________________■ o Gasoline■ o Vee■ o Vee-angle:■______

Number■of■Cylinders:■_________■■■Displacement:■___________■ o Natural■Gas

■ ■ SAE■(J620D)

Rated■Horsepower:________________________■ o Other:■______■ Flywheel■Size:■___________

■ ■ 6-1/2,7-1/2,8,10,11-1/2,14,16,etc

@■Rated■Speed:__________________________■ o 2-Stroke■■■■■■■■o 4-Stroke■■ (Attach■Drawing■if■non■standard)

Operating■Speed■(Constant):■________________■■■■■■■■■■■■■■■■■■■Idle■Speed:■____________________■ SAE■(J617C)

■ ■ Flywheel■Housing■Size:■______

PTO■Shaft■or■Output■Shaft■Diameter:______________________________________■ 6,■5,■4,■3,■2■or■1

Mass Moment of Inertia (J or WR2)

The■following■must■be■provided■for■Torsional■Vibration■Analysis.

Please■include■type■of■units■(J■or■WR2)■

Engine■Inertia:■__________________

Flywheel■Inertia:■_________________

Driven■Equipment■Inertia(s):■1._____________■2._____________3.____________4.___________■

T-10

Torsional

Coupling Selection Worksheet

Coupling Selection Worksheet for Internal Combustion Engines (diesel, gas, natural gas)

For■assistance■in■selecting■a■Torsional■coupling■for■your■internal■combustion■engine■application,■please■complete■the■entire■worksheet■and■fax■it■to■800-446-0878■

or■send■via■email■to■appleng@lovejoy-inc.com.■■Direct■questions■to■630-852-0500.

Add■sketch■or■Mass■Elastic■Diagram■if■necessary

Return■completed■worksheet■to■Lovejoy■Technical■Support■at■■email:■■appleng@lovejoy-inc.com■■■or■■Fax■to■800-446-0878

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Torsional

L-LOC Clamping Feature and Spline Identiﬁcation

Overview

Lovejoy’s L-LOC Spline Clamping Feature

Spline■shaft■wear,■proﬁle■distortion,■and■fretting■corrosion■all■are■major■concerns■in■spline■

shaft■applications■such■as■hydraulic■pumps.■■We■are■pleased■to■state■that■Lovejoy■has■a■

solution.■■It’s■called■the■L-LOC.

It■is■common■knowledge■that■typical■manufacturing■tolerances■between■spline■shafts■and■

mating■coupling■hubs■create■some■unavoidable■play■or■backlash.■■This■backlash■is■deﬁned■

as■the■minor■movement■between■the■shaft■and■hub,■typically■resulting■in■wear.■■This■tolerance■

related■movement■and■wear■is■often■further■compounded■by■misalignment■and■hammering■

forces■common■in■power■transmission.■■As■a■result,■fretting■wear■and■proﬁle■distortion■can■

occur,■even■when■shafts■are■manufactured■with■high■quality■hardened■steel■using■tight■

tolerances.■■If■not■checked,■abnormal■stresses■on■seals,■bearings,■and■other■engine■or■pump■

components■can■occur.■■The■results■are■costly■‘down■time’.■■A■great■deal■of■money■is■spent■

each■year■on■maintenance■caused■by■this■premature■wear■and■equipment■failure.

The■ideal■solution■to■spline■distortion■and■wear■is■to■eliminate■the■backlash■or■clearance■

related■to■mating■tolerances■and■assembly■misalignment.■■There■are■many■solutions■

available,■but■most■are■expensive,■time■consuming,■and■often■unsuccessful■causing■

additional■damage.

Lovejoy■coupling■hubs■with■the■L-LOC■spline■clamping■feature■have■proven■themselves■

successful■by■eliminating■the■backlash,■clearance■issues,■and■damage■caused■by■the■

hammering■effects■of■vibration,■including■torsional■vibration.■■The■result■is■longer■lasting■

spline■proﬁles■in■both■shafts■and■couplings■that■decrease■costly■downtime.

The■L-LOC■feature■is■a■remarkably■simple,■yet■effective■design,■consisting■of■a■unique■’dog■

bone’■shaped■slot■that■is■placed■slightly■above■and■parallel■to■the■spline■bore.■■When■these■

set■screws■are■tightened,■the■hub■becomes■ﬁrmly■locked■in■place,■gripping■the■full■diameter■

of■the■spline■shaft■and■the■set■screws■never■come■in■contact■with■the■spline.■■As■a■result,■

users■will■never■see■dents,■gouges,■or■burrs■on■the■shaft■from■mounting■the■hub.■■While■in■

use■the■hub■and■shaft■virtually■become■a■single■entity,■yet■when■the■set■screws■are■loosened,■

the■L-LOC■releases■its■grip■and■the■hub■can■be■easily■removed■from■the■spline■shaft.

Features

■■L-LOC■eliminates■premature■spline■shaft■maintenance■or■

replacement

■■Reduces■potentially■damaging■stress■on■equipment■

components

■■Quick■and■easy■to■assemble■and/or■removal

■■Improves■the■effectiveness■of■the■connection■between■the■

hub■and■shaft

■■Helps■reduce■equipment■noise■often■related■to■couplings

Spline Identiﬁcation and Selection

There■are■hundreds■of■combinations■of■splines■used■in■industry■today■and,■while■Lovejoy■

does■not■stock■all■of■these■splines,■many■are■maintained■in■inventory■while■a■large■variety■can■

be■quickly■machined■for■your■speciﬁc■needs.

When■identifying■splines,■it■is■important■to■know■what■Industry■Standard■the■spline■falls■under■

such■as■ANSI■B92.1A■(SAE■J744)■or■DIN5480.■■Manuals■and■data■sheets■provided■by■most■

original■equipment■manufacturers■contain■the■necessary■spine■data■for■users■to■identify■and■

order■a■hub■with■the■proper■spline.■■

Lovejoy’s■Customer■Service■and■Technical■Support■teams■can■help■pick■out■couplings■or■

hubs■containing■most■splines,■but■certain■information■will■need■to■be■provided■prior■to■making■

the■proper■selection.

SAE■Standard■Involute■splines■are■the■most■common■spline■in■use■in■the■United■States■and■

many■are■represented■in■the■ANSI■chart■shown■on■the■right.■Information■required■to■identify■

most■ANSI■(SAE)■splines■contains■the■number■of■teeth,■the■diametral■pitch,■and■the■major■

spline■diameter.■■Lovejoy’s■ANSI■splines■are■machined■to■meet■the■ANSI■standard■Class-5■ﬁt.

When■specifying■DIN-5480■splines,■it■is■necessary■to■provide■the■number■of■teeth,■the■major■

diameter■in■mm,■and■the■DIN■Module■number,■usually■in■format:

DIN■5480■x■Major■Dia■x■Module■x■Pressure■angle■(usually■30*)■x■number■of■teeth.

Lovejoy’s■DIN-5480■splines■are■machined■to■meet■the■DIN■standard■9H■ﬁt.

DIN-5482■metric■splines,■JIS■splines,■and■SAE■J499■parallel■side■splines,■can■be■quoted■

based■on■individual■applications.

SAE Code Number Diametral Major

of Teeth Pitch Diameter

Size (DP) in

A-A 9 20/40 0.500

A9 16/32 0.625

—11 16/32 0.750

B13 16/32 0.875

B-B 15 16/32 1.000

C14 12/24 1.250

—21 16/32 1.375

C-C 17 12/24 1.500

—23 16/32 1.500

D13 8/16 1.750

E13 8/16 1.750

—20 12/24 1.750

—27 16/32 1.750

F15 8/16 2.000

SAE Splines ANSI B92.1A (SAE J744)

Note:■■ n■■■Please■contact■Lovejoy■Technical■

Support■regarding■additional■spline■sizes■

not■included■in■this■chart.

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T-12

Torsional

LF Series

Overview

LF Series Torsional Coupling

The■LF■Series■coupling■is■designed■with■a■unique■and■highly■versatile■elastomeric■

element.■These■can■be■easily■integrated■into■a■variety■of■coupling■conﬁgurations■

to■meet■several■application■needs.■■LF■Style■elements■are■available■in■a■variety■of■

materials■to■match■the■necessary■coupling■dampening■characteristics■for■tuning■the■

systems■critical■speed■away■from■the■application■operating■speed.■■The■element■

can■be■connected■axially■to■a■ﬂywheel■adapter■plate■or■ﬂanged■hub■and■radially■to■

a■cylindrical■center■hub■using■the■appropriate■bolts.■■Axial■bolt■styles■include■either■

socket■head■bolts■with■a■special■dry■adhesive,■or■S-Style■bolts,■which■are■similar■to■

dowel■pins■(seen■picture■below).■■The■radial■bolts■are■used■to■connect■the■element■

to■the■cylindrical■hub.■This■unique■design■is■remarkably■simple,■highly■effective■and■

gives■the■LF■torsional■coupling■unmatched■performance■capabilities.■■The■coupling■

selection■should■be■veriﬁed■with■a■Torsional■Vibration■Analysis■(TVA)■of■the■system.■

The■information■required■to■perform■a■TVA■can■be■found■in■the■Coupling■Selection■

Worksheet■on■page■T-10.

■■Wide■range■of■standard■designs■and■materials

■■Application■versatility

■■Shaft■to■shaft■or■ﬂywheel■to■shaft■designs

■■Designed■to■accommodate■substantial■shock■loads,■vibration,■and■

misalignment

■■Low■moment■of■inertia

■■Electrically■insulating

■■No■lubrication,■maintenance■free

■■Unique■air-ﬂow■cooling■design

■■Different■element■stiffness■values■allow■for■torsional■tuning■of■

applications■with■diesel■engines

■■Economic■design■allows■for■cost■effective■solutions■for■torsional■

applications

■■Proven■L-LOC■spline-clamping■hub■virtually■eliminates■spline■shaft■

proﬁle■wear■and■“fretting”

■■Oil,■heat,■and■corrosion■resistant■elements■(Hytrel®,■Zytel®)

■■When■used■with■S-bolts,■the■coupling■can■accommodate■some■end■

ﬂoat.

■■S-bolts■accommodate■applications■requiring■“blind”■assembly

■■Model■6■unique■spacer■designs■span■gaps■between■equipment■in■

excess■of■the■normal■equipment■separation

■■Model■6■design■available■with■bearings■for■high■speeds■and■large■

amounts■of■equipment■separation

Features

Lovejoy’s■LF■product■line■supports■both■standard■style■elements■(above■left)■and■the■S-Style■elements■(above■right).■■The■standard■style■elements■bolt■to■the■

cylindrical■(center)■hub■and■the■ﬂywheel,■ﬂywheel■adapter,■or■ﬂange■hub.■■The■S-Style■utilizes■bolts■which■look■like■dowel■pins■and■are■designed■for■“blind”■

installations,■where■the■axial■bolts■may■not■be■accessible■for■tightening■during■the■installation■process.■■One■application■would■be■inside■a■bell■housing■when■all■

the■components■are■assembled■and■the■bolts■cannot■be■reached.■■The■S-Style■bolts■also■accommodate■a■small■amount■of■end■ﬂoat■when■necessary■to■prevent■

unnecessary■axial■stress■on■the■element.■■■When■looking■to■replace■elements,■please■note■the■difference■in■the■axial■holes.■■The■standard■elements■have■

stepped■holes■to■accommodate■the■cap■screws■(above■left)■which■are■used■to■mount■the■element.■■The■S-Style■elements■have■straight■holes■(above■right)■to■

accommodate■the■S-Style■pins.

Further■installation■instructions■can■be■found■at■www.lovejoy-inc.com■in■the■Technical■Resources■section.

Standard S-Style

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Torsional

LF Series – Elements

Overview

LF Series Torsional Elements

The■focus■of■any■coupling■is■the■ﬂexible■elements,■or■the■“working■component”.■

The■element■must■effectively■absorb■the■shock■loads,■misalignment■forces,■

and■torsional■vibrations,■under■a■variety■of■environmental■conditions.■The■

following■materials■are■used■to■accommodate■the■different■conditions■and■

environments■where■the■couplings■are■used.

High Temperature Rubber (HTR)

There■are■two■different■rubber■element■materials■available,■High■Temperature■

Rubber■(HTR)■and■Neoprene■(CR).■Both■elements■are■torsionally■soft■and■

are■placed■into■compression■during■assembly.■Rubber■under■compression■

can■carry■up■to■5■times■the■amount■of■torque■as■non-compressed■elements.■

The■elements■effectively■accommodate■shock,■misalignment,■and■vibration■

plus■minimize■harmful■radial■and■axial■forces■on■the■connected■equipment.■

Neoprene■(CR)■is■used■in■environments■that■are■hostile■to■High■Temperature■

Rubber■(HTR).

Available■Durometer■Hardness■:■ 50,■60■(Shore■A■scale)

Operating■Temperature■Range:■ HTR:■■■ -40°■to■194°■F■■

■ CR:■ -40°■to■175°■F

Maximum■Angular■Misalignment:■ Up■to■3°

Hytrel®

Elements■made■of■DuPont’s■Hytrel®■elastomer■compound■are■torsionally■

much■stiffer■than■natural■rubber■(20■times■stiffer)■and■were■developed■for■

combustion■engine■/■hydraulic■pump■applications.■Hytrel®■elements■have■20%■

greater■torque■capacity■as■compared■to■rubber■elements.■The■torsionally■stiff■

Hytrel®■element■moves■the■harmful■vibration■resonance■frequency■above■the■

operating■RPM■range.■The■element■design■also■reduces■harmful■radial■and■

axial■reactionary■forces.

Operating■Temperature■Range:■ -60°■to■250°■F

Maximum■Angular■Misalignment:■ 0.25°

Zytel®

Elements■made■of■DuPont’s■highly■stressable■Zytel®■elastomeric■compound■

have■excellent■chemical■compatibility■and■corrosion■resistance.■The■element■

composition■is■3-times■stiffer■then■Hytrel®■elements.■Zytel®■elements■exhibit■

less■than■1°■wind■up■at■normal■torque■and■zero■backlash.■Most■suited■for■

applications■where■heat,■moisture,■high■torque■/■high■speed,■and■corrosion■

resistance■are■critical■factors■in■the■coupling■selection.

Operating■Temperature■Range:■ -40°■to■300°■F

Maximum■Angular■Misalignment:■ 1°

HTR

Hytrel®

Zytel®

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T-14

Torsional

LF Series – Base Element, Models 1, 1/S, 2 and 2/S

Selection Data

The■following■are■standard■LF■Series■torsional■coupling■models.■The■

simple,■unique■design■permits■a■wide■range■of■models■from■common■

components■to■meet■each■application■requirement.■

Base Element

The■heart■of■the■LF■Series■coupling■is■the■ﬂexible■base■element.■This■

element■allows■the■customer■to■make■their■own■shaft■hubs■from■steel■bar■

stock■or■use■existing■hubs.■Ideal■for■quick■prototype■testing,■retroﬁt■and■high■

volume■applications.■

■

Model 1 and 1/S

Consists■of■the■ﬂexible■base■element■with■a■simple■steel■cylindrical■hub.■

The■1/S■is■shown■with■the■S-Style■axial■screw■(similar■to■a■dowel)■for■quick■

blind■assembly■of■the■drive■package.■The■same■combinations■available■in■

Model■1■are■also■available■in■the■Model■1/S.

■

Model 2 and 2/S

Provides■a■complete■shaft-to-shaft■coupling■in■a■range■of■sizes■for■

all■industrial■power■transmission■applications.■It■is■similar■to■Model■1■

shown■above,■except■a■ﬂanged■hub■is■added■to■make■the■shaft■to■shaft■

connection.

Model■2/S■allows■the■drive■package■to■be■“blind”■connected.■As■with■all■

S-Style■models,■axial■end■ﬂoat■of■equipment■shafts■can■be■accommodated■

without■harmful■push-pull■force.

Standard

Base Element

Model 1

Model 2

S-Style

Base Element

Model 1/S

Model 2/S

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Torsional

LF Series – Models 3, 3/S, 6, 6/S and 6B

Selection Data

Model 3 and 3/S

A■Model■1■or■1/S■with■the■addition■of■an■engine■mounting■plate■

becomes■a■Model■3■or■3/S.■It■is■available■in■standard■SAE■

ﬂywheel■sizes■as■well■as■made-to-order■sizes.■The■standard■

cylindrical■hub■is■available■in■a■variety■of■ANSI■(SAE),■DIN,■JIS,■

and■agricultural■spline■bores■for■hydraulic■pumps■and■other■

applications.■Various■standard■ﬂexible■element■materials■are■

available■for■speciﬁc■torsional,■misalignment■and■environmental■

requirements.

Model 6, 6/S and 6B

The■Model■6■is■available■with■ﬂoating■shafts■at■customer■speciﬁed■

assembly■lengths,■with■special■corrosion■and■heat■resistant■elements■

and■materials.■This■model■surpasses■all■other■ﬂoating■shaft■designs■

in■assembly,■simplicity■and■reliability.■Model■6/S■accommodates■

free■endplay■without■harmful■push-pull■reaction■forces.■Model■6/B■is■

a■highly■elastic■ﬂoating■shaft■coupling■with■accurate,■maintenance■

free■centering■ﬂanges■for■applications■with■long■spans■and■high■

misalignment■and■or■speed■requirements.

Model 3 Model 3/S

Model 6

Model 6B Model 6 and 6/S

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T-16

Torsional

LF Series

Performance Data

LF Series Performance Data

Element Nominal Maximum Max Allowable Dynamic Torsional Stiffness CTdyn

Material Torque Torque Speed Continuous Rubber 60 Shore Rubber 50 Shore Hytrel® 1 Zytel®

TKN TKmax Nmax Vibratory Trq (Standard) (Optional)

TKW

Size in-lb Nm in-lb Nm RPM in-lb Nm in-lb/rad Nm/rad in-lb/rad Nm/rad in-lb/rad Nm/rad in-lb/rad Nm/rad

LF1 HTR ■90■ ■10 ■200■ ■25 10,000 44 ■5 ■1,240■ ■140 ■800■ ■90 — — — —

LF2

HTR ■180■ ■20 ■530■ ■60 8,000 89 ■10 ■2,570■ ■290 ■1,600■ ■180 — — — —

Zytel®■265■ ■30 ■530■ ■60 10,000 N/A N/A — — — — — — ■55,150■ 6■230

LF4 HTR ■440■ ■50 ■1,100■ ■125 7,000 180 ■20 ■7,500■ ■850 ■4,870■ ■550 — — — —

LF8

HTR ■885■ ■100 ■2,480■ ■280 6,500 355 ■40 ■13,300■ 1■500 ■7,970■ ■900 — — — —

Zytel®■1,060■ ■120 ■2,480■ ■280 7,000 N/A N/A — — — — — — ■414,370■ 46■820

LF12 HTR ■1,240■ ■140 ■3,190■ ■360 6,500 440 ■50 ■38,900■ 4■400 ■23,900■ 2■700 — — — —

LF16

HTR ■1,770■ ■200 ■4,960■ ■560 6,000 710 ■80 ■30,100■ 3■400 ■17,700■ 2■000 — — — —

Hytrel®■1,770■ ■200 ■4,960■ ■560 5,500 N/A N/A — — — — ■320,000 36■000 — —

Zytel®■2,120■ ■240 ■4,960■ ■560 6,000 N/A N/A — — — — — — ■654,800■ 74■000

LF22 HTR ■2,430■ ■275 ■6,640■ ■750 6,000 885 ■100 ■79,600■ 9■000 ■54,000■ 6■100 — — — —

LF25 HTR ■2,790■ ■315 ■7,740■ ■875 5,000 1,100 ■125 ■39,800■ 4■500 ■4,800■ 2■800 — — — —

LF28 HTR ■3,700 ■420 ■10,600■ 1■200 5,000 1,330 ■150 ■106,200■ 12■000 ■66,400■ 7■500 — — — —

LF30

HTR ■4,400■ ■500 ■12,400■ 1■400 4,000 1,770 ■200 ■69,000■ 7■800 ■42,500■ 4■800 — — — —

Hytrel®■4,400■ ■500 ■12,400■ 1■400 4,000 N/A N/A — — — — ■780,000 88■000 — —

LF50

HTR ■6,200■ ■700 ■18,600■ 2■100 4,000 2,650 ■300 ■168,100■ 19■000 ■106,200■ 12■000 — — — —

Hytrel®■7,100■ ■800 ■17,700■ 2■000 4,000 N/A N/A — — — — 2,300,000 262■000 — —

LF80 HTR ■7,960■ ■900 ■18,600■ 2■100 4,000 2,830 ■320 ■221,200■ 25■000 ■141,600■ 16■000 — — — —

LF90 HTR ■9,700■ 1■100 ■27,900■ 3■150 3,600 3,980 ■450 ■141,600■ 16■000 ■92,900■ 10■500 — — — —

LF140 HTR ■15,000■ 1■700 ■43,400■ 4■900 3,600 6,200 ■700 ■354,000■ 40■000 ■234,500■ 26■500 — — — —

LF250 HTR ■26,500■ 3■000 ■77,400■ 8■750 3,000 11,000 1■250 ■592,900■ 67■000 ■380,500■ 43■000 — — — —

Notes:■■ n■■1■indicates:■For■Hytrel,■dynamic■torsional■stiffness■values■are■non-linear■with■respect■to■torque.■■Value■given■is■for■100%■of■nominal■torque.■

■n■■■N/A■indicates:■Not■Applicable.

■n■■■HTR■is■High■Temperature■Rubber.

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Torsional

LF Series

Performance Data

Notes:■■ n■■■*■indicates:■Angular■and■parallel■misalignment■values■are■dependent■on■speed,■and■for■rubber■elements,■should■be■adjusted■according■to■ﬁgure■4■on■

page■T-9.■Hytrel®■elements■are■only■for■applications■where■the■driven■component■is■piloted■to■the■driver■for■SAE■and■DIN■established■alignments■(i.e.■

Hydraulic■pump■ﬂange-mounted■to■engine■ﬂywheel■housing).

■n■■■**■■indicates:■The■“S-Style”■design■is■not■constrained■axially■and■allows■the■hubs■to■move■apart■without■creating■axial■force■on■the■connected■

equipment.

■n■■■N/A■indicates:■Not■Applicable.

■n■■■Hytrel®■elements■are■only■for■applications■where■the■driven■component■is■piloted■to■the■driver■for■essentially■perfect■alignment■(hydraulic■pump■

ﬂange-mounted■to■engine■housing).

■n■■■Special■length■S-Style■fastener■sleeves■can■further■increase■the■allowable■end■ﬂoat.

■n■■■HTR■is■High■Temperature■Rubber.

LF Series Performance Data Continued

Element Max Allowable Misalignment* Wind Up Static Stiffness

Material Angular Parellel Axial (End Float) Axial (End Float) (angle of twist) Axial CaRadial CrAngular Cw

∆Kw∆Kr Standard S-Style** at at

∆KaNominal Maximum

Torque Torque

Size Degrees in mm in mm in mm Degrees Degrees lb/in N/mm lb/in N/mm in-lb/deg Nm/deg

LF1 HTR 3.00 0.060 1.5 +/-0.08 +/-2 +0.18■/■-0.08 +4.6■/■-2 6 17.0 ■220■ ■38 ■860■ ■150 2.66 0.3

LF2

HTR 3.00 0.060 1.5 +/-0.12 +/-3 +0.12■/■-0.12 +3■/■-3 6 17.0 ■130■ ■22 ■860■ ■150 2.66 0.3

Zytel®1.00 0.004 0.1 +/-0.02 +/-0.5 +0.12■/■-0.02 +3■/■-0.5 — — — — — — — —

LF4 HTR 3.00 0.060 1.5 +/-0.12 +/-3 +0.17■/■-0.12 +4.3■/■-3 5 ■12.0 ■430■ ■75 ■2,860■ ■500 21.30 2.4

LF8

HTR 3.00 0.080 2.0 +/-0.16 +/-4 +0.20■/■-0.16 +5■/■-4 5 14.0 ■430■ ■75 ■2,860■ ■500 31.90 3.6

Zytel®1.00 0.004 0.1 +/-0.02 +/-0.5 +0.20■/-0.02 +5■/■-0.5 — — — — — — — —

LF12 HTR 2.00 0.080 2.0 +/-0.12 +/-3 +0.20■/-0.16 +5■/■-4 3 7.5 ■1,430■ ■250 ■5,710■ 1■000 80.00 9.0

LF16

HTR 3.00 0.080 2.0 +/-0.20 +/-5 +0.23■/■-0.20 +5.8■/■-5 5 14.0 ■570■ ■100 ■2,860■ ■500 44.00 5.0

Hytrel®0.25 0.000 0.0 +0.12■/■-0.08 +3■/■-2 N/A N/A — — — — — — — —

Zytel®1.00 0.004 0.1 +/-0.02 +/-0.5 +0.23■/-0.02 +5.8■/■-0.5 — — — — — — — —

LF22 HTR 2.00 0.080 2.0 +/-0.12 +/-3 +0.23■/-0.20 +5.8■/■-5 3 7.5 ■2,860■ ■500 ■7,420■ 1■300 106.00 12.0

LF25 HTR 3.00 0.080 2.0 +/-0.20 +/-5 +0.26■/■-0.20 +6.6■/■-5 5 14.0 ■800■ ■140 ■3,400■ ■600 62.00 7.0

LF28 HTR 2.00 0.080 2.0 +/-0.12 +/-3 +0.26■/■-0.20 +6.6■/■-5 3 7.5 ■3,140■ ■550 ■8,000■ 1■400 150.00 17.0

LF30

HTR 3.00 0.080 2.0 +/-0.20 +/-5 +0.26■/■-0.20 +6.6■/■-5 5 14.0 ■1,090■ ■190 ■4,280■ ■750 80.00 9.0

Hytrel®0.25 0.000 0.0 +0.12■/■-0.08 +3■/■-2 N/A N/A — — — — — — — —

LF50

HTR 3.00 0.080 2.0 +/-0.20 +/-5 +0.26■/■-0.20 +6.6■/■-5 3 7.5 ■3,700■ ■650 ■12,600■ 2■200 230.00 26.0

Hytrel®0.25 0.000 0.0 +0.12■/■-0.08 +3■/■-2 N/A N/A — — — — — — — —

LF80 HTR 2.00 0.060 1.5 +/-0.20 +/-5 +0.26■/■-0.12 +6.6■/■-3 3 7.5 ■4,850■ ■850 ■16,600■ 2■900 300.00 34.0

LF90 HTR 3.00 0.080 2.0 +/-0.20 +/-5 +0.34■/■-0.20 +8.6■/■-5 5 14.0 ■1,260■ ■220 ■5,700■ 1■000 150.00 17.0■

LF140 HTR 2.00 0.080 2.0 +/-0.20 +/-5 +0.34■/■-0.20 +8.6■/■-5 3 7.5 ■3,700■ ■650 ■13,100■ 2■300 336.00 38.0

LF250 HTR 2.00 0.080 2.0 +/-0.20 +/-5 +0.40■/■-0.20 +10■/■-5 3 7.5 ■6,570■ 1■150 ■23,400■ 4■100 600.00 68.0

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T-18

Torsional

LF Series – Base Element and Model 1

Dimensional Data

Base Element (HTR)

Model 1 (HTR)

Base Element (Hytrel®)

Model 1 (Hytrel®)

Base Element (Zytrel®)

Model 1 (Zytel®)

Note:■■ n■■HTR■is■High■Temperature■Rubber.

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LF Series Base Element and Model 1 Dimensional Data

ID 1 ID 2 OD FOD ET OAL L

(Cylindrical Hub) (Flange Hub) HTR Hytrel®Zytel®HTR Hytrel®Zytel®HTR Hytrel®Zytel®

Min Bore Max Bore Min Bore Max Bore

Size in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm

LF1 0.31 8 0.63 19 0.31 8 0.88 25 2.20 56 — — — — 2.20 56 0.94 24 — — — — 1.97 50.0 1.02 26 — — — —

LF2 0.44 10 0.88 26 0.50 12 1.38 38 3.35 85 — — 3.48 32 3.35 85 0.94 24 — — 0.94 32 2.36 60.0 1.26 32 — — 1.26 32.0

LF4 0.47 12 1.00 30 0.63 15 1.75 45 3.94 100 — — — — 3.94 100 1.10 28 — — — — 2.52 64.0 1.34 34 — — — —

LF8 0.50 12 1.38 38 0.75 18 2.00 55 4.72 120 — — 4.92 45 4.72 120 1.26 32 — — 1.18 45 3.46 88.0 1.81 46 — — 1.77 45.0

LF12 0.50 12 1.38 38 0.75 18 2.00 55 4.80 122 — — — — 4.72 120 1.26 32 — — — — 3.46 88.0 1.81 46 — — — —

LF16 0.63 15 1.63 48 0.81 20 2.63 70 5.91 150 6.10 155 6.10 53 5.91 150 1.65 42 1.69 58 1.38 53 4.17 106.0 2.20 56 2.28 58 2.08 53.0

LF22 0.63 15 1.63 48 0.81 20 2.63 70 5.91 150 — — — — 5.91 150 1.65 42 — — — — 4.17 106.0 2.20 56 — — — —

LF25 0.63 15 2.13 55 0.81 20 2.75 85 6.69 170 7.17 182 — — 6.69 170 1.81 46 1.85 62 — — 4.57 116.0 2.40 61 2.44 62 — —

LF28 0.63 15 2.13 55 0.81 20 2.75 85 6.69 170 — — — — 6.69 170 1.81 46 — — — — 4.57 116.0 2.40 61 — — — —

LF30 0.81 20 2.44 65 1.00 25 3.75 100 7.87 200 8.07 205 — — 7.87 200 2.28 56 2.28 76 — — 5.51 140.0 2.91 74 2.99 76 — —

LF50 0.81 20 2.44 65 1.00 25 3.75 100 7.87 200 8.07 205 — — 7.87 200 2.28 56 2.28 76 — — 5.51 140.0 2.91 74 2.99 76 — —

LF80 0.81 20 2.44 65 1.00 25 3.75 100 8.07 205 — — — — 7.87 200 2.56 65 — — — — 5.51 141.5 2.97 76 — — — —

LF90 1.19 30 3.35 85 1.19 30 4.25 110 10.24 260 — — — — 10.24 260 2.76 70 — — — — 6.61 168.0 3.46 88 — — — —

LF140 1.19 30 3.35 85 1.19 30 4.25 110 10.24 260 — — — — 10.24 260 2.76 70 — — — — 6.61 168.0 3.46 88 — — — —

LF250 1.63 40 4.25 105 1.63 40 5.00 130 13.38 340 — — — — 13.38 340 3.34 84 — — — — 8.18 208.0 4.25 108 — — — —

277

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Torsional

LF Series – Models 1/S, 2 and 2/S

Dimensional Data

Model 1S (HTR) Model 2 (HTR)

Model 2 (Hytrel®)Model 2/S (HTR) Model 2 (Zytel®)

LF Series Base Element and Model 1 Dimensional Data Continued

LTB HD FD FW BE S* ER** R BC T TS TL

(+/-0.11) (+/-3) Axial HTR Zytel®

Hole

and

Size in mm in mm in mm in mm in mm in mm in mm in mm in mm Division in mm in mm in mm

LF1 0.94 24 1.18 30 1.44 36 0.27 7 0.08 2 — — 0.87 22 0.43 11.0 1.73 44 2@180° ■■M6 0.39 10 — — 0.28 7

LF2 1.10 28 1.57 40 2.17 55 0.31 8 0.16 4 — — 0.79 20 0.39 10.0 2.68 68 2@180° ■■M8 0.55 14 0.59 15 0.31 8

LF4 1.18 30 1.77 45 2.56 65 0.31 8 0.16 4 — — 0.94 24 0.47 12.0 3.15 80 3@120° ■■M8 0.55 14 — — 0.31 8

LF8 1.65 42 2.36 60 3.15 80 0.39 10 0.16 4 — — 1.10 28 0.55 14.0 3.94 100 3@120° M10 0.67 17 0.75 19 0.39 10

LF12 1.65 42 2.36 60 3.15 80 0.39 10 0.16 4 — — 1.10 28 0.55 14.0 3.94 100 4@■■90° M11 0.67 17 — — 0.39 10

LF16 1.97 50 2.76 70 3.94 100 0.47 12 0.24 6 1.02 26 1.42 36 0.71 18.0 4.92 125 3@120° M12 0.75 19 0.86 22 0.47 12

LF22 1.97 50 2.76 70 3.94 100 0.47 12 0.24 6 — — 1.42 36 0.71 18.0 4.92 125 4@■■90° M12 0.75 19 — — 0.47 12

LF25 2.16 55 3.35 85 4.53 115 0.55 14 0.24 6 1.06 27 1.57 40 0.79 20.0 5.51 140 3@120° M14 0.86 22 — — 0.55 14

LF28 2.16 55 3.35 85 4.53 115 0.55 14 0.24 6 — — 1.57 40 0.79 20.0 5.51 140 4@■■90° M14 0.86 22 — — 0.55 14

LF30 2.60 66 3.94 100 5.51 140 0.63 16 0.31 8 1.38 35 1.97 50 0.98 25.0 6.50 165 3@120° M16 0.98 25 — — 0.63 16

LF50 2.60 66 3.94 100 5.51 140 0.63 16 0.31 8 1.38 35 1.99 50 0.98 25.0 6.50 165 4@■■90° M16 0.98 25 — — 0.63 16

LF80 2.60 66 3.94 100 5.51 140 0.63 16 0.31 8 — — 2.40 61 1.20 30.5 6.50 165 4@■■90° M16 0.98 25 — — 0.63 16

LF90 3.15 80 4.92 125 6.30 160 0.75 19 0.31 8 — — 2.44 62 1.22 31.0 8.46 215 3@120° M20 1.26 32 — — 0.79 20

LF140 3.15 80 4.92 125 6.30 160 0.75 19 0.31 8 — — 2.44 62 1.22 31.0 8.46 215 4@■■90° M20 1.26 32 — — 0.79 20

LF250 3.94 100 6.30 160 7.68 195 0.75 19 0.31 8 — — 3.03 77 0.89 22.5 11.02 280 4@■■90° M20 1.26 32 — — 0.79 20

Notes:■■ n■■■*■indicates:■Dimenstion■S■for■Hytrel®■only.

■n■■■**■indicates:■Dimension■ER■for■HTR■(rubber)■only.

■n■■■■Dimensions■for■basic■Models■1,■2,■3■and■6.

■n■■HTR■is■High■Temperature■Rubber.

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T-20

Torsional

LF Series – Models 3 and 3/S

Dimensional Data

Notes:■■ n■■■*■indicates:■Dimension■ER■for■HTR■(rubber)■only.

■n■■■HTR■is■High■Temperature■Rubber.

Model 3 (HTR) Model 3/S (HTR)

Model 3 and 3/S (Zytel®)Model 3 (Hytrel®)

LF Series Flywheel Models 3 and 3/S Dimensional Data

ID OD ET TL L W

Min Max HTR Hytrel®Zytel®HTR Hytrel®Zytel®HTR Hytrel®Zytel®

Size in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm

LF1 0.31 8 0.63 19 2.20 56 — — — — 0.94 24 — — — — 0.28 7 1.02 26.0 — — — — — —

LF2 0.44 10 0.88 26 3.35 85 — — 3.48 88 0.94 24 — — 0.94 24 0.31 8 1.26 32.0 — — 1.26 32 — —

LF4 0.47 12 1.00 30 3.94 100 — — — — 1.10 28 — — — — 0.31 8 1.34 34.0 — — — — — —

LF8 0.50 12 1.38 38 4.72 120 — — 4.92 125 1.26 32 — — 1.18 30 0.39 10 1.81 46.0 — — 1.77 45 0.19 5

LF12 0.50 12 1.38 38 4.80 122 — — — — 1.26 32 — — — — 0.39 10 1.81 46.0 — — — — 0.19 5

LF16 0.63 15 1.63 48 5.91 150 6.10 155 6.10 155 1.65 42 1.69 43 1.38 36 0.47 12 2.20 56.0 2.28 58 2.08 53 0.19 5

LF22 0.63 15 1.63 48 5.91 150 — — — — 1.65 42 — — — — 0.47 12 2.20 56.0 — — — — 0.19 5

LF25 0.63 15 2.13 55 6.69 170 — — — — 1.81 46 — — — — 0.55 14 2.40 61.0 — — — — 0.19 5

LF28 0.63 15 2.13 55 6.69 170 — — — — 1.81 46 — — — — 0.55 14 2.40 61.0 — — — — 0.19 5

LF30 0.81 20 2.44 65 7.87 200 8.07 205 — — 2.28 58 2.28 58 — — 0.63 16 2.91 74.0 2.99 76 — — 0.19 5

LF50 0.81 20 2.44 65 7.87 200 8.07 250 — — 2.28 58 2.28 58 — — 0.46 12 2.91 74.0 2.99 76 — — 0.19 5

LF80 0.81 20 2.44 65 8.07 205 — — — — 2.56 65 — — — — 0.63 16 2.97 75.5 — — — — 0.19 5

LF90 1.19 30 3.35 85 10.24 260 — — — — 2.76 70 — — — — 0.79 20 3.46 88.0 — — — — 0.19 5

LF140 1.19 30 3.35 85 10.24 260 — — — — 2.76 70 — — — — 0.79 20 3.46 88.0 — — — — 0.19 5

LF250 1.63 40 4.25 105 13.38 340 — — — — 3.34 85 — — — — 0.79 20 4.25 108.0 — — — — 0.50 13

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Torsional

LF Series – Models 3, 3/S and Flywheel Housings

Dimensional Data

Typical Flywheel Housing Combinations

SAE LF Series LK Series SAE J617C Flywheel Housing

J620D

Flywheel

Size Size Size 6 5 4 3 2 1

6.5 8■thru■28 100 s s

7.5 8■thru■28 100 l l

88■thru■30 100 s

10 8■thru■140 100,■125 l s s

11.5 16■thru■140 100,■125,■150,■150D l l s

14 28■thru■250 150,■UNIV l

18 250 UNIV l

Notes:■■ s■indicates:■Preferred■combinations.

■l ■indicates:■Optional■sizes■available.

Notes:■■ n■■■*■indicates:■Hytrel®■only.

■n■■HTR■is■High■Temperature■Rubber.

Notes:■■ n■■■SAE■J620■Flywheel■dimensions.

■n■■N/A■indicates:■Not■Applicable.

■n■■HTR■is■High■Temperature■Rubber.

LF Series Flywheel Models 3/S Dimensional Data

P FBC

SAE Pilot Bolt Circle Thru Holes LF Coupling Size for SAE

Flywheel Diameter Diameter Nominal Flywheel Sizes

HTR Hytrel® Zytel®

Size in mm in mm Qty Dia Model 3 & 3/S Model 3 Model 3

6.5 8.499 215.90 7.875 200.02 6 0.31 8,■16 8,■16 8,■16

7.5 9.499 241.30 8.750 222.25 8 0.31 8,■16 8,■16 8,■16

810.374 263.52 9.625 244.47 6 0.41 16,■25 6,■30 16,■25,■30

10 12.374 314.32 11.625 295.27 8 0.41 25,■30,■50,■90 30,■50 25,■30

11.5 13.874 352.42 13.125 333.37 8 0.41 30,■50,■90,■140,■250 50,■140,■250 30

14 18.374 466.72 17.250 438.15 8 0.53 90,■140,■250 140 N/A

16 20.374 517.50 19.250 488.95 8 0.53 250 250 N/A

LF Series Flywheel Models 3 and 3/S Dimensional Data Continued

LTB BE S* ER* R HD BC T TS

(±0.11) (+/-3) Axial HTR Zytel®

Hole

and

Size in mm in mm in mm in mm in mm in mm in mm Division in mm in mm

LF1 0.94 24 0.08 2 — — 0.87 22 0.43 11.0 1.18 30 1.73 44 2@180° M6 0.39 10 — —

LF2 1.10 28 0.16 4 — — 0.79 20 0.39 10.0 1.57 40 2.68 68 2@180° M8 0.55 14 0.59 15

LF4 1.18 30 0.16 4 — — 0.94 24 0.47 12.0 1.77 45 3.15 80 3@120° M8 0.55 14 — —

LF8 1.65 42 0.16 4 — — 1.10 28 0.55 14.0 2.36 60 3.94 100 3@120° M10 0.67 17 0.75 19

LF12 1.65 42 0.16 4 — — 1.10 28 0.55 14.0 2.36 60 3.94 100 4@■■90° M11 0.67 17 — —

LF16 1.97 50 0.24 6 1.02 26 1.42 36 0.71 18.0 2.76 70 4.92 125 3@120° M12 0.75 19 0.86 22

LF22 1.97 50 0.24 6 — — 1.42 36 0.71 18.0 2.76 70 4.92 125 4@■■90° M12 0.75 19 — —

LF25 2.16 55 0.24 6 1.06 27 1.57 40 0.79 20.0 3.35 85 5.51 140 3@120° M14 0.86 22 — —

LF28 2.16 55 0.24 6 — — 1.57 40 0.79 20.0 3.35 85 5.51 140 4@■■90° M14 0.86 22 — —

LF30 2.60 66 0.31 8 1.38 35 1.97 50 0.98 25.0 3.94 100 6.50 165 3@120° M16 0.98 25 — —

LF50 2.60 66 0.31 8 1.38 35 1.97 50 0.98 25.0 3.94 100 6.50 165 4@■■90° M16 0.98 25 — —

LF80 2.60 66 0.16 4 — — 2.40 61 1.20 30.5 3.94 100 6.50 165 4@■■90° M16 0.98 25 — —

LF90 3.15 80 0.31 8 — — 2.44 62 1.22 31.0 4.92 125 8.46 215 3@120° M20 1.26 32 — —

LF140 3.15 80 0.31 8 — — 2.44 62 1.22 31.0 4.92 125 8.46 215 4@■■90° M20 1.26 32 — —

LF250 3.94 100 0.31 8 — — 3.03 77 0.89 22.5 6.30 160 11.02 280 4@■■90° M20 1.26 32 — —

2.15 54.5

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Torsional

LF Series – Models 6, 6/S and 6B

Selection Process

Model 6 (HTR)

Model 6 (Zytel®)

Model 6 and 6/S (HTR)

Model 6B (HTR)

Model 6 and 6/S (Rubber Base Elements HTR and CR)

This■model■compensates■for■considerable■axial,■radial■and■angular■misalignment.■■

The■rubber■elements■torsionally■soft.■■Lengths■are■made■to■customer■requirements.■■

S-Style■axial■mounting■screws■allow■the■hubs■to■have■free■end■ﬂoat■without■exerting■

axial■loads■on■the■connected■equipment,■while■allowing■for■quick■assembly.

Model 6 and 6/S (Zytel® Elements)

Elements■made■of■DuPont’s■super-tough,■corrosion■resistant■Zytel®■are■torsionally■

stiff■without■backlash,■with■less■than■1°■windup.■■Large■spans,■equal■to■all-metal■

couplings,■can■be■accommodated■without■internal■support■bearings■when■lightweight■

Zytel®■are■used.■■Hubs,■hardware■and■tubes■are■available■in■stainless■steel■or■with■

plating■and■corrosion■resistant■coatings.■■S-Style,■axial■mounting■screws■allow■for■free■

end-ﬂoat■without■harmful■reactionary■forces.

Model 6B (HTR Elements)

Similar■to■Model■6■except■the■center■shaft■is■supported■by■internal■maintenance■

free■bearing■material.■■This■allows■greater■equipment■separation■and■high■

speeds,■as■well■as■high■angular■misalignment,■which■can■be■obtained■with■

rubber■elements.

The■drawing■at■the■lower■left■shows■one■of■the■many■special■designs■available.■■

A■standard■ﬂywheel■adapter■plate■(see■model■3)■is■used■to■couple■to■a■diesel■

engine■ﬂywheel.■■The■ﬂanged■hub■on■the■other■end■is■supplied■with■extra■long■

S-Style■connecting■screws■(Notice■the■element■is■reversed■from■its■normal■

direction).■■This■arrangement■permits■extensive■axial■movement■(free■end■ﬂoat)■

of■the■drive■package.

One■of■the■many■features■of■the■Model■6■is■the■center■ﬂoating■shaft■can■be■

radially■removed■without■displacing■the■coupled■machines.■■Flexible■elements■

may■be■pre-assembled■to■the■center■segment■and■then■ﬁnal■assembled■to■the■

hubs■quickly,■with■little■hardware.

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Torsional

LF Series – Models 6, 6/S and 6B

Dimensional Data

LF Series Models 6, 6/S and 6/B Dimensional Data

ID1 - ID2 OD BC

Nominal Torque Min Bore Max Bore Element Axial

HTR Zytel®HTR Zytel®Hole

and

Size in-lb Nm in-lb Nm in mm in mm in mm in mm in mm Division

LF1 90 ■10 — — 0.31 8 0.88 25 2.20 56 — — 1.73 44 2@180°

LF2 180 ■20 265 30 0.50 12 1.38 38 3.35 85 3.48 88 2.68 68 2@180°

LF4 440 ■50 — — 0.63 15 1.75 45 3.94 100 — — 3.15 80 3@120°

LF8 885 ■100 1,060 120 0.75 18 2.00 55 4.72 120 4.92 125 3.94 100 3@120°

LF12 1,240 ■140 — — 0.75 18 2.00 55 4.80 122 — — 3.94 100 4@■■90°

LF16 1,770 ■200 2,120 240 0.81 20 2.63 70 5.91 150 6.1 155 4.92 125 3@120°

LF22 2,430 ■275 — — 0.81 20 2.63 70 5.91 150 — — 4.92 125 4@■■90°

LF25 2,790 ■315 — — 0.81 20 2.75 85 6.69 170 — — 5.51 140 3@120°

LF28 3,700 ■420 — — 0.81 20 2.75 85 6.69 170 — — 5.51 140 4@■■90°

LF30 4,425 ■500 — — 1.00 25 3.75 100 7.87 200 — — 6.50 165 3@120°

LF50 6,195 ■700 — — 1.00 25 3.75 100 7.87 200 — — 6.50 165 4@■■90°

LF80 7,960 ■900 — — 1.00 25 3.75 100 8.07 205 — — 6.50 165 4@■■90°

LF90 9,735 1■100 — — 1.19 30 4.25 110 10.24 260 — — 8.46 215 3@120°

LF140 15,000 1■700 — — 1.19 30 4.25 110 10.24 260 — — 8.46 215 4@■■90°

LF250 26,500 3■000 — — 1.63 40 5.00 130 13.38 340 — — 11.02 280 4@■■90°

Note:■■ n■■■Refer■to■Speed■and■Length■Performance■Data■table■(page■T-24)■for■maximum■and■minimum■values.

LF Series Models 6, 6/S and 6/B Dimensional Data Continued

FOD LTB BSE S PT FW TD ET

Flange Hub Span HTR Zytel®

Size in mm in mm in mm in mm in mm in mm in mm in mm

LF1 2.20 56 0.94 24 * 0.51 13 0.20 5 0.28 7 1.18 30 0.94 24 — —

LF2 3.35 85 1.10 28 * 0.55 14 0.20 5 0.31 8 1.62 40 0.94 24 0.94 24

LF4 3.94 100 1.18 30 * 0.63 16 0.20 5 0.31 8 1.81 45 1.10 28 — —

LF8 4.72 120 1.65 42 * 0.71 18 0.20 5 0.39 10 2.38 60 1.26 32 1.18 30

LF12 4.80 120 1.65 42 * 0.71 18 0.20 5 0.39 10 2.38 60 1.26 32 — —

LF16 5.91 150 1.97 50 * 0.94 24 0.20 5 0.47 12 2.75 70 1.65 42 1.38 36

LF22 5.91 150 1.97 50 * 0.94 24 0.20 5 0.47 12 2.75 70 1.65 42 — —

LF25 6.69 170 2.16 55 * 1.02 26 0.20 5 0.55 14 3.38 85 1.81 46 — —

LF28 6.69 170 2.16 55 * 1.02 26 0.20 5 0.55 14 3.38 85 1.81 46 — —

LF30 7.87 200 2.60 66 * 1.30 33 0.20 5 0.63 16 4.00 100 2.28 58 — —

LF50 7.87 200 2.60 66 * 1.30 33 0.20 5 0.63 16 4.00 100 2.28 58 — —

LF80 8.07 200 2.60 80 * 1.36 35 0.20 5 0.63 16 4.00 100 2.56 65 — —

LF90 10.24 260 3.15 80 * 1.54 39 0.20 5 0.75 19 5.00 125 2.76 70 — —

LF140 10.24 260 3.15 100 * 1.54 39 0.20 5 0.75 19 5.00 125 2.76 70 — —

LF250 13.38 340 3.94 125 * 1.81 46 0.39 10 0.75 19 6.25 160 3.35 85 — —

Notes:■■ n■■■*■indicates:■■Contact■Lovejoy■Technical■Support■when■specifying■shaft■separation.

■n■■■Refer■to■Speed■and■Length■Performance■Data■table■(page■T-24)■for■maximum■and■minimum■values.

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T-24

LF Series Models 6 and 6/B Speed and Length Performance Data

BSE BSE

Maximum Speed Minimum Length Maximum Length

(short length only) (all versions) @ 1750 RPM

HTR Zytel®HTR Zytel®

Model 6 Model 6B Model 6 Model 6 Model 6B Model 6

Size RPM RPM RPM in mm in mm in mm in mm

LF1 1,500 6,000 — 3.10 79 45 1140 52 1320 — —

LF2 1,500 6,000 10,000 3.10 79 52 1320 58 1475 58 1475

LF4 2,900 6,000 — 3.61 92 59 1500 62 1575 — —

LF8 2,900 6,000 7,000 4.17 106 64 1625 72 1830 72 1830

LF12 2,900 6,000 — 4.17 106 64 1625 72 1830 — —

LF16 2,900 6,000 6,000 5.42 138 65 1650 77 1955 77 1955

LF22 2,900 6,000 — 5.42 138 65 1650 77 1955 — —

LF25 2,900 5,000 — 5.98 152 58 1475 84 2130 — —

LF28 2,900 5,000 — 5.98 152 58 1475 84 2130 — —

LF30 2,900 4,000 — 7.47 190 59 1500 91 2310 — —

LF50 2,500 4,000 — 7.47 190 83 2100 91 2310 — —

LF80 2,500 4,000 — 7.47 190 83 2100 91 2310 — —

LF90 1,500 3,600 — 9.03 230 34 865 99 2515 — —

LF140 1,500 3,600 — 9.03 230 73 1855 99 2515 — —

LF250 1,500 3,000 — 10.80 274 86 2185 117 2970 — —

Torsional

LF Series – Models 6 and 6B

Maximum Length and Speed Data

Model 6 Model 6B

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Torsional

LF Series – Models 6 and 6B

Maximum Length and Speed Data

LF Series Model 6 (HTR) Maximum Length “BSE” at Various Speeds - Dimensional Data*

Maximum Span Length “BSE”

Speed (RPM) →500 600 720 750 900 1000 1200 1500 1800

Size in mm in mm in mm in mm in mm in mm in mm in mm in mm

LF1 94 2390 86 2185 78 1980 76 1930 69 1750 65 1650 58 1470 51 1300 45 1140

LF2 109 2770 99 2515 89 2260 88 2235 79 2000 74 1880 66 1680 57 1450 52 1320

LF4 116 2950 106 2690 96 2440 94 2390 86 2190 81 2060 73 1850 64 1630 59 1500

LF8 134 3400 121 3070 110 2795 107 3720 97 2460 91 2370 81 2060 70 1780 64 1630

LF12 134 3400 121 3070 110 2795 107 2720 97 2460 91 2370 81 2060 70 1780 64 1630

LF16 144 3660 129 2375 117 2970 114 2900 103 2610 96 2440 85 2160 72 1830 65 1650

LF22 144 3660 129 3275 117 2970 114 2900 103 2610 96 2440 85 2160 72 1930 65 1650

LF25 154 3970 138 3505 123 3125 120 3050 106 2690 98 2490 83 2110 64 1630 58 1470

LF28 154 3970 138 3505 123 3125 120 3050 106 2690 98 2490 83 2110 64 1630 58 1470

LF30 168 4270 151 3835 134 3400 131 3330 115 2920 106 2690 90 2290 68 1730 59 1500

LF50 173 4395 157 3990 143 3630 139 3530 126 3200 119 3020 106 2670 92 2340 83 2100

LF80 173 4395 157 3990 143 3630 139 3530 126 3200 119 3020 106 2690 92 2340 83 2100

LF90 177 4495 155 3940 134 3400 130 3300 107 2720 94 2390 69 1750 38 965 34 860

LF140 187 4750 169 4290 151 3835 147 3730 130 3300 121 3070 104 2640 83 2100 73 1860

LF250 211 5360 190 4830 171 4340 167 4240 148 3760 137 3480 118 3000 94 2390 86 2190

Notes:■■ n■■■*■indicates:■Longer■span■length■for■given■speed■is■possible■with■model■6B.■

■n■■■Please■consult■Lovejoy■Technical■Support■for■maximum■span■for■higher■speeds.

LF Series Model 6 (Zytrel®) Maximum Length “BSE” at Various Speeds - Dimensional Data*

LF Series Model 6 with (Zytrel® ) Maximum Span Length “BSE”

Speed (RPM) →500 600 720 750 900 1000 1200 1500 1800

Size in mm in mm in mm in mm in mm in mm in mm in mm in mm

LF2X 110 2794 101 2565 92 2337 90 2286 82 2083 82 2083 71 1803 64 1626 58 1473

LF8X 136 3454 124 3150 113 2870 110 2794 101 2565 101 2565 87 2210 78 1981 72 1829

LF16X 147 3734 134 3404 122 3099 120 3048 109 2769 109 2769 94 2388 84 2134 72 1829

Note:■■ n■■*■indicates:■Maximum■span■length■is■based■on■tube■deﬂection■and■a■critical■speed■1.5■times■above■operating■speed.

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T-26

Torsional

LF Series

Weights and Mass Moment of Inertia

LF Series Weight and Mass Moment of Inertia for Couplings with HTR Elements

Weights* Inertia**

Base Model 1 Model 1/S Model 2 Model 2/S Base Model 1 Model 1/S Model 2 Model 2/S

Element Element

Size lb kg lb kg lb kg lb kg lb kg lb-in2kg-cm2lb-in2kg-cm2lb-in2kg-cm2lb-in2kg-cm2lb-in2kg-cm2

LF1 0.13 0.06 0.46 0.21 0.53 0.24 1.04 0.47 1.08 0.49 0.12 0.35 0.26 0.75 0.29 0.86 0.55 1.60 0.58 1.70

LF2 0.33 0.15 1.01 0.46 1.08 0.49 2.34 1.06 2.40 1.09 0.43 1.25 0.85 2.5 1.13 3.3 2.5 7.3 2.8 8.1

LF4 0.46 0.21 2.89 1.31 1.54 0.70 5.09 2.31 3.75 1.70 1.13 3.30 1.71 5.0 2.22 6.5 3.9 11.3 4.4 12.8

LF8 0.71 0.32 2.98 1.35 3.17 1.44 7.61 3.45 7.80 3.54 2.39 7.0 5.13 15.0 6.36 18.6 14.0 41.0 15.2 44.6

LF12 0.77 0.35 3.20 1.45 3.44 1.56 7.83 3.55 8.07 3.66 2.87 8.4 6.22 18.2 6.83 20.0 15.1 44.2 15.8 46.1

LF16 1.43 0.65 5.03 2.28 5.14 2.33 13.58 6.16 13.69 6.21 8.00 23.4 14.5■ 42.5 16.8 49.1 40.6 118.8 42.9 125.4

LF22 1.54 0.70 5.56 2.52 5.78 2.62 14.15 6.42 14.59 6.62 9.09 26.6 17.2 50.4 24.0 70.2 43.2 126.5 50.0 146.3

LF25 1.85 0.84 7.91 3.59 8.31 3.77 20.53 9.31 20.92 9.49 17.2 50.2 31.0 90.7 35.1 102.7 73.5 215.0 77.6 227.0

LF28 2.09 0.95 8.36 3.79 8.93 4.05 20.97 9.51 21.52 9.76 19.0 55.6 35.0 102.4 38.7 113.2 84.7 247.8 88.3 258.5

LF30 3.15 1.43 12.48 5.66 13.27 6.02 33.53 15.21 34.33 15.57 34.9 102.0 68.3 200.0 75.3 220.4 186.4 545.5 193.4 565.9

LF50 3.53 1.60 13.32 6.04 14.33 6.50 34.39 15.60 35.38 16.05 35.5 104.0 70.1 205.0 86.6 253.4 188.1 550.5 204.7 598.9

LF80 4.63 2.10 15.10 6.85 15.98 7.25 36.60 16.60 37.48 17.00 45.0 131.8 82.1 240.3 90.2 263.9 200.1 585.5 208.1 609.1

LF90 7.28 3.30 25.46 11.55 26.96 12.23 63.21 28.67 64.71 29.35 153.8 450.0 224.7 657.5 259.4 759.2 557.0 1630.1 591.8 1731.8

LF140 8.05 3.65 27.18 12.33 29.15 13.22 64.93 29.45 66.93 30.36 195.5 573.0 263.1 770.0 298.3 873.0 595.5 1742.6 630.7 1845.6

LF250 15.65 7.10 41.84 18.98 44.11 20.01 97.93 44.42 100.18 45.44 599.4 1754.0 821.5 2404.0 864.2 2529.0 1798.8 5264.0 18471.5 5389.0

Notes:■■ n■■■■■■*■To■obtain■Weight■of■Model-3:

1.■Select■weight■of■ﬂywheel■plate■(from■chart■below■labeled■SAE■Flywheel■Adapter■Plates)■

2.■Select■weight■of■Model■1■or■1/S■coupling■(from■chart■above)■

3.■Add■ﬂywheel■plate■and■coupling■weight■together

■n■■■**■To■obtain■Inertia■of■Model-3:

1.■Select■inertia■of■ﬂywheel■plate■(from■chart■below■labeled■SAE■Flywheel■Adapter■Plates)■

2.■Select■inertia■of■Model■1■or■1/S■coupling■(from■chart■above)■

3.■Add■ﬂywheel■plate■and■coupling■inertia■together

LF Series Weight and Mass Moment of Inertia for Couplings with Hytrel® Elements

Weight Inertia

Model 1 Model 2 Hytrel®Model 1 Model 2 Hytrel®

Size lb kg lb kg lb kg lb-in2kg-cm2lb-in2kg-cm2lb-in2kg-cm2

LF16 5.07 2.30 10.58 4.80 – – 17.7 206.6 43.7 512.0 – –

LF30 11.46 5.20 29.32 13.30 14.33 6.50 68.4 800.7 186.5 2183.2 150.3 1759.4■(SAE10)

LF50 12.35 5.60 30.20 13.70 15.43 7.00 80.5 942.3 198.7 2326.0 197.4 2310.8■(SAE■11.5)

LF Series Weight and Mass Moment of Inertia for Couplings with Zytel® Elements

Weight Inertia

Base

Element

Model 1/1S Model 2/2S Base

Element

Model 1/1S Model 2/2S

Size lb kg lb kg lb kg lb-in2kg-cm2lb-in2kg-cm2lb-in2kg-cm2

LF2X 0.2 0.1 0.9 0.4 2.2 1.0 17.7 206.6 43.7 512.0 – –

LF8X 0.6 0.3 3.3 1.5 7.7 3.5 68.4 800.7 186.5 2183.2 150.3 1759.4■(SAE10)

LF16X 1.0 0.5 4.6 2.1 13.1 5.9 80.5 942.3 198.7 2326.0 197.4 2310.8■(SAE■11.5)

SAE Flywheel Adapter Plates

(3/16" thick)

SAE Flywheel Weight Inertia

Size (J620) lb kg lb-in2kg-cm2

6.5 2.6 1.2 26 76

7.5 3.4 1.5 42 123

8 4.1 1.9 60 176

10 6.0 2.7 122 357

11.5 7.7 3.5 193 565

14 12.8 5.8 589 1724

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Torsional

LF Series Floating-Shaft – Models 6 and 6B

Selection Process

Step 1: Torque Capacity

Values■for■normal■torque■TKN,■maximum■torque■TKmax,■and■

continuous■vibratory■torque■TKw■remain■the■same■and■are■found■in■

the■table■of■Performance■Data■on■page■16■and■23.

Step 2: Stiffness Values and Wind-Up

Since■2■torsional■rubber■elements■are■used■together■in■series,■

values■from■the■Performance■Data■table■on■page■16■and■17■for■

dynamic■torsional■stiffness■CTdyn,■static■angular■stiffness■Cw■and■

static■axial■stiffness■Ca,■should■be■multiplied■by■1/2.■Values■for■

wind-up■should■be■multiplied■by■2.

Step 3: Misalignment

Performance■Data■table■values■for■allowable■axial■misalignment■

are■doubled■for■the■standard■element■design.■Values■for■the■

S-Style■version■will■be■the■same■but■can■be■increased■by■use■of■

special-length■sleeves■(consult■Lovejoy■Technical■Support).

Angular■misalignment■will■be■equal■at■both■ends■and■should■

be■kept■within■the■limits■given■in■the■Performance■Data■table.■■

Allowable■parallel■misalignment■is■related■to■the■angular■

misalignment■and■the■distance■between■shaft■ends■(BSE).■It■is■■

calculated■by■applying■one■of■the■following■equations:

Model■6:■ r=(L-2Y)tan ( )

Model■6B:■ r=[(L-2(Y+BT)]tan ( )

■■=■angular■misalignment■(degrees)

r■=■parallel■misalignment■inches■(mm)

and■BSE,Y,■and■BT■inches■(mm)■are■from■the■dimension■table.

The■angular■and■parallel■misalignment■values■are■dependent■on■speed.

Step 4: Selecting Model 6 or Model 6B (HTR only)

The■basic■model■6■is■suitable■for■most■short■or■medium■length■

spans■(distance■between■shaft■ends).■Longer■spans■and■higher■

speeds■will■require■the■bearing-supported■ﬂoating■shaft■feature■of■

Model■6B.■■Regardless■of■length,■some■applications■will■require■the■

Model■6B■design■based■on■speed■alone.■Use■the■Maximum■Speed■

and■Length■table■to■guide■your■choice■or■consult■Lovejoy■Technical■

Support■for■assistance.

LF Series Floating-Shaft – Models 6 and 6B

The■following■guidelines■cover■additional■considerations■unique■to■the■ﬂoating-shaft■versions■of■the■LF■coupling.■Use■them■together■with■the■selection■information■

for■engine■applications■or■general■applications■found■on■pages■T-6■through■T-8.

Permissible Misalignment vs. Speed

Percent of Rating for Allowable

Misalignment at TKN

Operating Speed

5000

4000

3000

2000

1000

0 50 100 150

HTR (Angular & Parallel)

Zytel® (Angular)

Percent of Rating for Allowable

Misalignment at TKN

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Torsional

LVK Series

Overview / Performance Data

LVK Series

The■LVK■Series■is■designed■for■direct■coupled■equipment.■■The■LVK■Series■coupling■is■highly■torsionally■

compliant,■allowing■the■engine■to■drive■a■large■inertia■load■safely■away■from■damaging■torsional■

resonance■or■critical■speeds.■■The■coupling■selection■should■be■veriﬁed■with■a■Torsional■Vibration■

Analysis■of■the■system■(see■page■T-10).

Element Features

■■50■&■60■Durometer■(Shore■A■scale)■available

■■-40°■to■194°■F■temperature■range

■■Available■in■SAE■J620■6.5■through■14■Flywheel■sizes■(some■metric■sizes■available■upon■request)

■■Blind■assembly,■no■lubrication

■■Material■available■in■HTR■and■EPDM

Hub Features

■■High■quality■powdered-metal■construction

■■Splined■hubs■available■with■L-LOC■clamping■system

■■Engagement■Dogs■are■slightly■crowned■to■avoid■edge■pressure■due■to■misalignment

■■Available■in■bore■with■keyway■and■spline■connections

LVK Series Performance Data

SAE Hardness Power Nominal Maximum Continuous Dynamic

Flywheel at Torque Torque Vibratory Torque Stiffness

Size Shore A 2100 RPM TKN TKmax TWCTdyn

Size scale HP kW in-lbs Nm in-lb Nm in-lb Nm in-lbs/rad Nm

LVK25

7.5,■8 50 62 46 1,875 212 ■4,500■ 508 750 85 12,586 1■422

10,■11.5 60 90 67 2,700 305 ■5,750■ 650 1,080 122 21,658 2■447

LVK30

8,■10 50 98 73 2,945 333 ■7,089■ 801 1,180 133 18,201 2■056

11.5 60 142 106 4,250 480 ■10,825■ 1■223 1,700 192 21,970 2■482

LVK35

10,■11.5 50 136 101 4,075 460 ■9,781■ 1■105 1,630 184 25,820 2■917

14 60 193 144 5,800 655 ■14,500■ 1■638 2,320 262 31,167 3■521

Typical Applications

Compressors,■centrifugal■pumps,■hydraulic■

pumps■and■generator■sets.

SAE J620 Flywheel Dimensional Data

P1 BC P2 J H G D T

Nominal Tapped

Clutch Holes

(ﬂywheel)

Size in mm in mm in mm in mm in mm in mm in mm Qty Size

6.5 8.500 215.90 7.875 200.02 7.25 184.2 0.38 9.7 0.50 12.7 1.19 30.2 ■■5.00 127.0 ■■6 5/16-18

7.5 9.500 241.30 8.750 222.25 8.12 206.4 0.50 12.7 0.50 12.7 1.19 30.2 — — ■■8 5/16-18

8 10.375 263.52 9.625 244.48 8.88 225.6 0.50 12.7 0.50 12.7 2.44 62.0 — — ■■6 3/8-16

10 12.375 314.32 11.625 295.28 10.88 276.4 0.50 12.7 0.62 15.7 2.12 53.8 ■■7.75 196.9 ■■8 3/8-16

11.5 13.875 352.42 13.125 333.38 12.38 314.5 0.88 22.4 1.12 28.4 1.56 39.6 ■■8.00 203.2 ■■8 3/8-16

14 18.375 466.72 17.250 438.15 16.12 409.4 0.88 22.4 1.12 28.4 1.00 25.4 ■■8.75 222.2 ■■8 1/2-13

16 20.375 517.52 19.250 488.95 18.12 460.2 0.88 22.4 1.12 28.4 0.62 15.7 10.00 254.0 ■■8 1/2-13

18 22.500 571.50 21.375 542.92 19.62 498.3 1.25 31.8 1.25 31.8 0.62 15.7 — — ■■6 5/8-11

21 26.500 673.10 25.250 641.35 23.00 584.2 1.25 31.8 1.25 31.8 0.00 0.0 — — 12 5/8-11

24 28.875 733.43 27.250 692.15 25.38 644.7 1.25 31.8 1.25 31.8 0.00 0.0 — — 12 3/4-10

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Torsional

LVK Series – SAE J620 Flywheel Application

Dimensional Data

LVK Series - SAE J620 Flywheel Application Dimensional Data

FOD BC FL ML OAL OD HD LTB* ID

Flange Dimensions Element Dimensions Hub Dimensions Min Max

SAE Number / Flange Mounting Element Hubstar Bore Bore

Flywheel Dia of Holes Thickness Length

Size

Size in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm

LVK25

6.5 8.50 215.9 7.875 200.0 6■x■0.33 6■x■8.5

0.19 4.8 1.83 46.50

– –

6.90 175.3 2.56 65

— —

9/16 15 1-9/16 40

7.5 9.50 241.3 8.750 222.3 8■x■3.30 8■x■8.5 2.17 55 1.26 32

8 10.38 263.5 9.625 244.5 6■x■0.41 6■x■10.5 2.68 68 1.89 48

10 12.38 314.3 11.625 295.3 6■x■0.41 8■x■10.5 3.00 76 2.20 56

11.5 13.88 352.4 13.125 333.4 8■x■0.41 8■x■10.5 – – – –

LVK30

8 10.38 263.5 9.625 244.5 6■x■0.41 6■x■10.5

0.19 4.8 2.13 54.10

2.72 69

8.10 205.7 3.35 85

1.97 42

13/16 20 2-1/8 5510 12.38 314.3 11.625 295.3 8■x■0.41 8■x■10.5

2.95 75 1.89 48

11.5 13.88 352.4 13.125 333.4 8■x■0.41 8■x■10.5

LVK35 11.5 13.88 352.4 3.125 333.4 8■x■0.41 8■x■10.5 0.19 4.8 2.20 55.88 2.80 71 8.65 219.7 3.35 85 1.97 42 13/16 20 2-1/8 55

14 18.38 466.7 17.250 438.2 8■x■0.50 8■x■12.7 3.03 77 1.89 48

Note:■■ n■■*■indicates:■Shorter■or■longer■hub■lengths■available■upon■request.

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T-30

Torsional

LV Series

Overview / Performance Data

LV Series

The■LV■Series■coupling■is■designed■and■built■for■diesel■engine■driven■

equipment■such■as■agricultural■and■offroad■equipment■using■universal■

joint■drive■shafts.■The■LV■Series■is■ideal■for■universal■joint■driven■

equipment■applications■as■well■as■other■arrangements.■The■LV■Series■

couplings■are■highly■torsionally■compliant,■allowing■the■engine■to■drive■

a■large■inertia■load■safely■away■from■damaging■torsional■resonance■

and■critical■speeds.■The■coupling■selection■should■be■veriﬁed■with■a■

Torsional■Vibration■Analysis■of■the■system■(see■page■T-10).■

Element Features:

■■50■&■60■Durometer■(Shore■A■scale)■available

■■-■40°■to■194°■F■temperature■range

■■Available■in■SAE■J620■6.5■through■14■ﬂywheel■sizes■and■varies■in■

metric■sizes

■■Blind■assembly,■no■lubrication

■■Material■available■in■HTR■and■EPDM

Optional Hub Features:

■■LVC■Style■hub■available■for■straight■and■spline■bores■upon■request

■■Splined■hubs■available■with■L-LOC■clamping■system■

LV Series Performance Data

SAE Hardness Power Nominal Maximum Continuous Dynamic Torsional

Flywheel at 2000 RPM Torque Torque Vibratory Torque Stiffness

Size Shore A TKN TKmax TWCTdyn

Size scale HP kW in-lbs Nm in-lb Nm in-lb Nm in-lb/rad Nm/rad

LV200 10,■11.5,■14 50 177 132 5,578 630 16,815 1■900 1,395 158 ■726■ 82

LV250 10,■11.5,■14 50 238 178 7,500 847 21,596 2■440 1,875 212 ■871■ 98

LV350 10,■11.5,■14 50 343 256 10,820 1■223 31,860 3■600 2,705 306 ■1,417■ 160

Typical Applications

LVC■style■is■excellent■for■adapting■the■LV■coupling■to■applications■with■

generators,■reciprocation■pumps■and■compressors,■screw■compressors,■

and■other■equipment■driven■directly■off■an■SAE■ﬂywheel.

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Torsional

LV Series – SAE J620 Flywheel Application

Dimensional Data

LV Series - SAE J620 Flywheel Application Dimensional Data

Flange Dimensions U-Joint Adapter Plate

SAE FOD BC Number / Dia FL ML U-Joint UJBC Number Thread ID Pilot

Flywheel of Holes Flange Mounting Adapter Bolt of Size Pilot ID Depth 2.54 mm

Size Thickness Length Model Circle Dia Holes 0.100

Inch

Size in mm in mm in mm in mm in mm Number in mm UNF in mm

LV200

10 12.375 314.3 11.625 295.3 8■x■0.41 8■x■10.5

0.50 12.7 3.55 90.2■

— — — — — — —

11.5 13.875 352.4 13.125 333.4 8■x■0.41 8■x■10.5 31 3.125 79.4 4 3/8-24■UNF■2B 2.375 60.4■

14 18.375 466.7 17.250 438.2 8■x■0.50 8■x■12.7 35/41 3.750 95.3 4 7/16-20■UNF■

2B 2.750 69.9

LV250

10 12.375 314.3 11.625 295.3 8■x■0.41 8■x■10.5

0.50 12.7 3.55 90.2■

35/41 3.750 95.3 4 7/16-20■UNF■

2B 2.750 69.9

11.5 13.875 352.4 13.125 333.4 8■x■0.41 8■x■10.5 48/55 4.750 120.7 4 1/2-20■UNF■2B 3.750 95.3■

14 18.375 466.7 17.250 438.2 8■x■0.50 8■x■12.7 61 6.125 155.6 8 3/8-24■UNF■2B 6.625 168.3

LV350

10 12.375 314.3 11.625 295.3 8■x■0.41 8■x■10.5

0.50 12.7 3.55 90.2■

61 6.125 155.6 8 3/8-24■UNF■2B 6.625 168.3

11.5 13.875 352.4 13.125 333.4 8■x■0.41 8■x■10.5 71 7.250 184.2 8 3/8-24■UNF■2B 7.750 196.9■

14 18.375 466.7 17.250 438.2 8■x■0.50 8■x■12.7 — — — — — — —

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T-32

Torsional

LM Series

Overview

LM Series

The■LM■Series■torsional■couplings■are■designed■speciﬁcally■for■

diesel■engine■driven■equipment.■■The■LM■couplings■are■highly■

torsionally■compliant,■allowing■the■engine■to■drive■a■relatively■

small■inertia■load■safely■from■damaging■torsional■resonance■

over■a■wide■speed■range■from■low■idle■RPM■to■full■engine■

speed.■■This■task■is■accomplished■by■shifting■the■critical■speeds■

far■enough■below■the■idle■speed■allowing■full■use■of■the■entire■

working■speed■range■of■the■engine■with■very■few■limitations.■■

These■engineered■couplings■affect■an■attenuated■level■of■stress■

throughout■the■whole■drive■train■by■reducing■vibratory■torque■to■

a■very■low■level.■■The■coupling■selection■should■be■veriﬁed■with■

a■Torsional■Vibration■Analysis■of■the■system.■

Materials

Elastomeric Element

■■Temperature-resistant■natural■rubber■available■in■a■variety■of■Shore■A■

scale■hardness■to■suite■individual■application■requirements

■■-49°■to■200°■F■operating■temperature■range

■■Silicone■element■available■for■high■ambient■temperatures

■■EPDM■available■for■chemical■resistant

■■-49°■to■250°■F■operating■temperature■range

Outer Ring

■■High-grade■cast■aluminum■alloy

Inner Hub

■■Steel■with■minimum■tensile■strength■of■85,000■psi■(600■N/mm²)

■■Available■in■bore■with■keyway■and■spline■connections■

■■Taper-Loc■spline■hubs■available

■■Splines■with■L-LOC■available

Typical Applications

■■Splitter-gear■multiple■pump■drives

■■Generator■sets■(2-bearing)

■■Locomotives

■■Hydraulic■pumps

■■Centrifugal■pumps

■■Compressors

Range of Sizes

■■8■sizes■ranging■from■nominal■torques■of■2,210■to■33,600■in-lb■■

(250■to■3800■Nm)

■■SAE■J620■Flywheel■sizes■available■from■6■through■18

■■3■coupling■design■types

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Torsional

LM Series – Types SB, SC, SBE and SCE

Selection Data

Type SB

Type SCBType SCA

Type SCEType SBE

Tapered Locking Hubs

LM Torsional Coupling Design Types

Type SB

Sizes 240 to 2400

The■driven■inner■hub■consists■of■two■pieces:■the■vulcanized■steel■ring■and■

the■inner■tapered■hub.■These■two■parts■are■bolted■together■and■the■torque■

is■transmitted■by■the■friction■force■created■by■the■axial■bolts,■drawing■the■

tapered■hub■into■the■mating■taper■in■the■element.

This■is■a■long■tapered■ﬁt,■but■can■easily■disassembled■if■the■coupling■has■to■

be■removed.■The■vulcanized■steel■ring■creates■a■very■high■inward■pressure■

acting■on■the■inner■driven■tapered■hub.■To■utilize■this■pressure,■the■driven■hub■

is■slotted■in■an■axial■direction.■This■compresses■the■driven■hub■and■driven■

shaft.■This■clamping■effect■can■be■used■equally■well■on■cylindrical■shafts■with■

keys■or■splined■shafts.

Type SC

Sizes 2800 to 3500

An■inner■ring■made■of■spheroidal■cast■iron■is■vulcanized■into■the■

elastomeric■element.■This■ﬂange■is■bolted■to■the■inner■tapered■hub.■

Depending■upon■the■arrangement■of■the■elastomeric■element,■two■

different■lengths■are■possible■utilizing■the■same■components.

Standard Conﬁguration: SCA

Reversed Element: SCB

(extended mounting length)

Types SBE and SCE

Special Radial Assembly / Disassembly Types

(Drop-Out Types) All Sizes

The■elastomeric■element■can■be■changed■quickly■and■easily■without■

disturbing■the■coupling■shaft,■provided■the■ﬂywheel■housing■does■not■

protrude■too■much.■These■versions■can■be■particularly■advantageous■on■

larger■sizes,■especially■if■the■hub■is■interference■ﬁt.■

Special Types

In■addition■to■the■standard■types■shown■here,■many■special■

types■have■been■developed.■Please■contact■Lovejoy■Technical■

Support■for■more■information.

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T-34

Torsional

LM Series – Types SB, SCA and SCB (HTR)

Performance Data

Notes:■■ n■■■*■indicates:■At■10■Hz.

■n■■**■indicates:■Constant■value■for■natural■rubber.

■n■■***■indicates:■Flywheel■side■of■the■coupling.

Silicone Temperature

Factor St

2.5

1.5

0.5

80 100 120 140 160 180 200

Degrees °F

TKN ≥ TLN • S t

Temperature Factor St2

for Cont. Vibr. Torque Tkw

and Allowable Power Loss Pkv

0.5

80 100 120 140 160 180 200

Degrees F

HTR

St2

Tkw

Pv< Pkv * St2

Tw< Tkw * St2 * (1/Sf)

Pkv

Resonance Factor VR

Relative Damping Factor y

High Temperature Rubber (HTR)

f in Hz Vry

35-40 12.0 0.52

50 6.0 1.05

60 5.7 1.10

70 5.5 1.15

LM Series - SB, SCA and SCB (HTR) Performance Data

Hardness Nominal Max Continuous* Allowable Dynamic** Flange Max Mass Moment of Inertia

(Durometer) Torque Rating Torque Rating Vibratory Power Torsional Size for Speed Primary*** Secondary

TKN TKmax Torque Loss Stiffness J620 Nmax J1J2

Shore A TKW PKV CTdyn Flywheel

Size scale in-lb Nm in-lb Nm in-lb Nm Watts in-lb/rad Nm/rad RPM lb-in2kg-m2lb-in2kg-m2

LM240

50 ■2,210■ 250 ■4,430■ 500 ■885■ 100

■8,190■ ■925 ■■8 4,000 17.77 0.021 3.25 0.004

60 ■2,660■ 300 ■5,310■ 600 ■1,060■ 120 ■12,400■ 1■400 10 3,600 26.74 0.031 3.25 0.004

70 ■3,100■ 350 ■6,640■ 750 ■1,240■ 140 ■19,900■ 2■250 — — — — — —

LM400

50 ■3,540■ 400 ■7,080■ 800 ■1,420■ 160

■14,200■ 1■600 10

3,600 0.04 0.037 0.01 0.01160 ■4,430■ 500 ■8,850■ 1■000 ■1,770■ 200 ■22,100■ 2■500 11.5

70 ■4,870■ 550 ■9,740■ 1■100 ■1,950■ 220 ■35,400■ 4■000 14

LM800

50 ■6,200■ 700 ■12,400■ 1■400 ■2,480■ 280

105

■24,800■ 2■800 10 3,600 51.17 0.060 25.29 0.030

60 ■7,520■ 850 ■15,000■ 1■700 ■3,000■ 340 ■37,200■ 4■200 11.5 3,500 62.53 0.073 25.29 0.030

70 ■8,400■ 950 ■17,700■ 2■000 ■3,360■ 380 ■60,200■ 6■800 14 3,000 117.70 0.138 25.29 0.030

LM1200

50 ■8,850■ 1■000 ■17,700■ 2■000 ■3,540■ 400

150

■39,800■ 4■500 11.5 3,500 65.61 0.077 38.95 0.046

60 ■10,600■ 1■200 ■21,200■ 2■400 ■4,250■ 480 ■61,900■ 7■000 14 3,000 12.23 0.014 38.95 0.046

70 ■11,500■ 1■300 ■26,600■ 3■000 ■4,600■ 520 ■104,000■ 11■700 — — — — — —

LM1600

50 ■12,800■ 1■450 ■26,700■ 2■900 ■5,130■ 580

220

■53,100■ 6■000 11.5 3,200 191.40 0.224 66.63 0.078

60 ■15,900■ 1■800 ■31,900■ 3■600 ■6,370■ 720 ■79,600■ 9■000

14 3,000 168.30 0.020 66.63 0.078

16 2,500 234.10 0.274 66.63 0.078

70 ■17,700■ 2■000 ■35,400■ 4■000 ■7,080■ 800 ■133,000■ 15■000 18 2,300 329.30 0.386 66.63 0.078

LM2400

50 ■17,700■ 2■000 ■35,400■ 4■000 ■7,080■ 800

300

■88,500■ 1■000 14 3,000 182.00 0.213 130.70 0.153

60 ■22,100■ 2■500 ■44,300■ 5■000 ■8,850■ 1■000 ■133,000■ 15■000 16 2,500 247.70 0.290 130.70 0.153

70 ■24,800■ 2■800 ■53,100■ 6■000 ■9,910■ 1■120 ■221,000■ 25■000 18 2,300 343.00 0.402 130.70 0.153

LM2800

50 ■24,800■ 2■800 ■53,100■ 6■000 ■9,910■ 1■120

360

■221,000■ 25■000 14 3,000 242.30 0.284 192.80 0.226

60 ■26,600■ 3■000 ■66,400■ 7■500 ■10,600■ 1■200 ■332,000■ 37■500 16 2,500 269.80 0.316 192.80 0.226

70 ■28,300■ 3■200 ■70,800■ 8■000 ■11,300■ 1■280 ■558,000■ 63■000 18 2,300 364.90 0.427 192.80 0.226

LM3500

50 ■28,300■ 3■200 ■57,500■ 6■500 ■11,300■ 1■280

450

■142,000■ 16■000 14 3,000 242.30 0.284 196.10 0.230

60 ■31,000■ 3■500 ■70,800■ 8■000 ■12,400■ 1■400 ■212,000■ 24■000 16 2,500 374.90 0.439 196.10 0.230

70 ■33,600■ 3■800 ■75,200■ 8■500 ■13,500■ 1■520 ■336,000■ 38■000 18 2,300 501.70 0.587 196.10 0.230

Frequency Factor Sf

f in Hz≤10 ≥10

Sf 1 √■f■/■10

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LM Series - SB, SCA and SCB (HTR) Dimensional Data

A C** ID d3 DB E L L1 N1

SAE Min Bore Max Bore Weight

J620

Size in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm lb kg

240 SB

Tapered

■■8 1.81 46 2.95 ± 0.35 75 ± 9 0.59 15 1.97 50 10.31 262 1.97 50 1.06 27 2.95 75 2.36 60 2.87 73 2.77 6.1

10 1.81 46 2.95 ± 0.35 75 ± 9 0.59 15 1.97 50 8.86 225 1.97 50 1.06 27 2.95 75 2.36 60 2.87 73 2.95 6.5

400 SB 10 1.77 45 2.95 ± 0.28 75 ± 7 0.79 20 2.36 60 12.32 313 2.40 61 0.98 25 3.15 80 2.56 65 3.54 90 3.90 8.6

800 SB

10 1.97 50 3.22 ± 0.08 82 ± 2 0.79 20 2.76 70 12.44 316 2.80 71 0.71 18 3.31 84 2.60 66 4.21 107 5.03 11.1

11.5 1.54 39 2.80 ± 0.12 71 ± 3 0.79 20 2.76 70 13.82 351 2.80 71 0.71 18 3.31 84 2.60 66 4.21 107 4.58 10.1

14 1.81 46 2.91 ± 0.24 74 ± 6 0.79 20 2.76 70 12.52 318 2.80 71 0.71 18 3.31 84 2.60 66 4.21 107 5.22 11.5

1200 SB 11.5 1.54 39 2.56 ± 0.16 65 ± 4 0.79 20 2.76 70 13.82 351 2.80 71 0.71 18 3.31 84 2.60 66 4.21 107 6.58 14.5

14 1.81 46 2.91 ± 0.24 74 ± 6 0.79 20 2.76 70 13.82 351 2.80 71 0.71 18 3.31 84 2.60 66 4.21 107 7.44 16.4

1600 SB

14 2.40 61 3.82 ± 0.43 97 ± 11 1.18 30 4.13 105 18.31 465 4.17 106 1.02 26 4.17 106 3.35 85 5.91 150 10.21 22.5

16 2.40 61 3.82 ± 0.43 97 ± 11 1.18 30 4.13 105 16.42 417 4.17 106 1.02 26 4.17 106 3.35 85 5.91 150 10.80 23.8

18 2.40 61 3.82 ± 0.43 97 ± 11 1.18 30 4.13 105 16.42 417 4.17 106 1.02 26 4.17 106 3.35 85 5.91 150 11.48 25.3

2400 SB

14 2.40 61 3.82 ± 0.24 97 ± 6 1.18 30 4.13 105 18.31 465 4.17 106 1.02 26 4.17 106 3.35 85 5.91 150 14.11 31.1

16 2.40 61 3.82 ± 0.24 97 ± 6 1.18 30 4.13 105 16.42 417 4.17 106 1.02 26 4.17 106 3.35 85 5.91 150 14.70 32.4

18 2.40 61 3.82 ± 0.24 97 ± 6 1.18 30 4.13 105 16.42 417 4.17 106 1.02 26 4.17 106 3.35 85 5.91 150 15.38 33.9

2800 SCA

Bolted

14 2.40 61 3.66 ± 0.16 93 ± 4 1.38 35 4.33 110 18.31 465 — — 1.34 34 — — 4.13 105 6.38 162 14.29 31.5

16 2.40 61 3.66 ± 0.16 93 ± 4 1.38 35 4.33 110 16.42 417 — — 1.34 34 — — 4.13 105 6.38 162 14.88 32.8

18 2.40 61 3.66 ± 0.16 93 ± 4 1.38 35 4.33 110 16.42 417 — — 1.34 34 — — 4.13 105 6.38 162 15.56 34.3

2800 SCB

14 2.40 61 5.31 ± 0.16 135 ± 4 1.38 35 4.33 110 18.31 465 — — 2.99 76 5.16 131 4.13 105 6.38 162 14.29 31.5

16 2.40 61 5.31 ± 0.16 135 ± 4 1.38 35 4.33 110 16.42 417 — — 2.99 76 5.16 131 4.13 105 6.38 162 14.88 32.8

18 2.40 61 5.31 ± 0.16 135 ± 4 1.38 35 4.33 110 16.42 417 — — 2.99 76 4.96 126 4.13 105 6.38 162 15.56 34.3

3500 SCA

14 2.76 70 3.94 ± 0.31 100 ± 8 1.38 35 4.33 110 18.31 465 — — 0.98 25 — — 4.13 105 6.38 162 15.38 33.9

16 2.76 70 3.94 ± 0.31 100 ± 8 1.38 35 4.33 110 18.31 465 — — 0.98 25 — — 4.13 105 6.38 162 16.60 36.6

18 2.76 70 3.94 ± 0.31 100 ± 8 1.38 35 4.33 110 18.31 465 — — 0.98 25 — — 4.13 105 6.38 162 17.46 38.5

3500 SCB

14 2.76 70 5.31 ± 0.31 135 ± 8 0.24 6 4.33 110 18.31 465 — — 2.36 60 5.51 140 4.13 105 6.38 162 15.38 33.9

16 2.76 70 5.31 ± 0.31 135 ± 8 1.38 35 4.33 110 18.31 465 — — 2.36 60 5.51 140 4.13 105 6.38 162 16.60 36.6

18 2.76 70 5.31 ± 0.31 135 ± 8 1.38 35 4.33 110 18.31 465 — — 2.36 60 5.51 140 4.13 105 6.38 162 17.46 38.5

T-35

Torsional

LM Series – Types SB, SCA and SCB (HTR)

Dimensional Data

240 – 2400 SB 2800 – 3500 SCA 2800 – 3500 SCB

Note:■■ n■■■■■**■indicates:■At■10■Hz.

Note:■■ n■■■*■indicates:■SAE■J620■Flywheel■Dimensional■Data■can■be■found■on■page■T-41.

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T-36

Torsional

LM Series – Types SBE and SCE (HTR)

Performance Data

Notes:■■ n■■■*■indicates:■At■10■Hz.

■n■■**■indicates:■Constant■value■for■natural■rubber.

■n■■***■indicates:■Flywheel■side■of■the■coupling.

LM Series - SBE and SCE (HTR) Performance Data

Hardness Nominal Max Continuous* Allowable Dynamic** Flange Max Mass Moment of Inertia

(Durometer) Torque Rating Torque Rating Vibratory Power Torsional Size for Speed Primary*** Secondary

TKN TKmax Torque Loss Stiffness J620 Nmax J1J2

Shore A TKW PKV CTdyn Flywheel

Size scale in-lb Nm in-lb Nm in-lb Nm Watts in-lb/rad Nm/rad RPM lb-in2kg-m2lb-in2kg-m2

LM240

50 ■2,210■ 250 ■4,430■ 500 ■885■ 100

■8,190■ ■925 ■■8 4,000 17.77 0.021 3.25 0.004

60 ■2,660■ 300 ■5,310■ 600 ■1,060■ 120 ■12,400■ 1■400 10 3,600 26.74 0.031 3.25 0.004

70 ■3,100■ 350 ■6,640■ 750 ■1,240■ 140 ■19,900■ 2■250 — — — — — —

LM400

50 ■3,540■ 400 ■7,080■ 800 ■1,420■ 160

■14,200■ 1■600 10

3,600 0.04 0.037 0.01 0.01160 ■4,430■ 500 ■8,850■ 1■000 ■1,770■ 200 ■22,100■ 2■500 11.5

70 ■4,870■ 550 ■9,740■ 1■100 ■1,950■ 220 ■35,400■ 4■000 14

LM800

50 ■6,200■ 700 ■12,400■ 1■400 ■2,480■ 280

105

■24,800■ 2■800 10 3,600 51.17 0.060 25.29 0.030

60 ■7,520■ 850 ■15,000■ 1■700 ■3,000■ 340 ■37,200■ 4■200 11.5 3,500 62.53 0.073 25.29 0.030

70 ■8,400■ 950 ■17,700■ 2■000 ■3,360■ 380 ■60,200■ 6■800 14 3,000 117.70 0.138 25.29 0.030

LM1200

50 ■8,850■ 1■000 ■17,700■ 2■000 ■3,540■ 400

150

■39,800■ 4■500 11.5 3,500 65.61 0.077 38.95 0.046

60 ■10,600■ 1■200 ■21,200■ 2■400 ■4,250■ 480 ■61,900■ 7■000 14 3,000 12.23 0.014 38.95 0.046

70 ■11,500■ 1■300 ■26,600■ 3■000 ■4,600■ 520 ■104,000■ 11■700 — — — — — —

LM1600

50 ■12,800■ 1■450 ■26,700■ 2■900 ■5,130■ 580

220

■53,100■ 6■000 11.5 3,200 191.40 0.224 66.63 0.078

60 ■15,900■ 1■800 ■31,900■ 3■600 ■6,370■ 720 ■79,600■ 9■000

14 3,000 168.30 0.020 66.63 0.078

16 2,500 234.10 0.274 66.63 0.078

70 ■17,700■ 2■000 ■35,400■ 4■000 ■7,080■ 800 ■133,000■ 15■000 18 2,300 329.30 0.386 66.63 0.078

LM2400

50 ■17,700■ 2■000 ■35,400■ 4■000 ■7,080■ 800

300

■88,500■ 1■000 14 3,000 182.00 0.213 130.70 0.153

60 ■22,100■ 2■500 ■44,300■ 5■000 ■8,850■ 1■000 ■133,000■ 15■000 16 2,500 247.70 0.290 130.70 0.153

70 ■24,800■ 2■800 ■53,100■ 6■000 ■9,910■ 1■120 ■221,000■ 25■000 18 2,300 343.00 0.402 130.70 0.153

LM2800

50 ■24,800■ 2■800 ■53,100■ 6■000 ■9,910■ 1■120

360

■221,000■ 25■000 14 3,000 242.30 0.284 192.80 0.226

60 ■26,600■ 3■000 ■66,400■ 7■500 ■10,600■ 1■200 ■332,000■ 37■500 16 2,500 269.80 0.316 192.80 0.226

70 ■28,300■ 3■200 ■70,800■ 8■000 ■11,300■ 1■280 ■558,000■ 63■000 18 2,300 364.90 0.427 192.80 0.226

LM3500

50 ■28,300■ 3■200 ■57,500■ 6■500 ■11,300■ 1■280

450

■142,000■ 16■000 14 3,000 242.30 0.284 196.10 0.230

60 ■31,000■ 3■500 ■70,800■ 8■000 ■12,400■ 1■400 ■212,000■ 24■000 16 2,500 374.90 0.439 196.10 0.230

70 ■33,600■ 3■800 ■75,200■ 8■500 ■13,500■ 1■520 ■336,000■ 38■000 18 2,300 501.70 0.587 196.10 0.230

Silicone Temperature

Factor St

2.5

1.5

0.5

80 100 120 140 160 180 200

Degrees °F

TKN ≥ TLN • S t

Temperature Factor St2

for Cont. Vibr. Torque Tkw

and Allowable Power Loss Pkv

0.5

80 100 120 140 160 180 200

Degrees F

HTR

St2

Tkw

Pv< Pkv * St2

Tw< Tkw * St2 * (1/Sf)

Pkv

Resonance Factor VR

Relative Damping Factor y

High Temperature Rubber (HTR)

f in Hz Vry

35-40 12.0 0.52

50 6.0 1.05

60 5.7 1.10

70 5.5 1.15

Frequency Factor Sf

f in Hz≤10 ≥10

Sf 1 √■f■/■10

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Torsional

LM Series – Types SBE and SCE (HTR)

Dimensional Data

2800 - 3500 SBE 2800 - 3500 SCE

LM Series - SBE and SCE (HTR) Radial Dimensional Data

A C** ID d3 E L L1 N1

SAE Min Bore Max Bore Weight

Size J620 in mm in mm in mm in mm in mm in mm in mm in mm in mm lb kg

240 SBE ■■8 1.81 46 4.45 ± 0.08 113 ± 2 0.59 15 1.77 45 10.31 262 2.28 58 4.17 106 2.36 60 2.60 66 2.18 4.8

10 1.81 46 4.45 ± 0.08 113 ± 2 0.59 15 1.77 45 8.86 225 2.28 58 4.17 106 2.36 60 2.60 66 2.36 5.2

400 SBE 10 1.77 45 4.61 ± 0.08 117 ± 2 0.79 20 2.17 55 12.32 313 2.48 63 4.65 118 2.56 65 3.35 85 3.45 7.6

800 SBE 11.5 1.54 39 4.61 ± 0.08 117 ± 2 0.79 20 2.56 65 13.82 351 2.52 64 5.12 130 2.60 66 3.94 100 5.03 11.1

14 1.81 46 4.69 ± 0.08 119 ± 2 0.79 20 2.56 65 12.52 318 2.52 64 5.12 130 2.60 66 3.94 100 6.35 14.0

1200 SBE 11.5 1.54 39 4.45 ± 0.08 113 ± 2 0.79 20 2.56 65 13.82 351 2.52 64 5.12 130 2.60 66 3.94 100 6.89 15.2

14 1.81 46 4.72 ± 0.08 120 ± 2 0.79 20 2.56 65 13.82 351 2.52 64 5.12 130 2.60 66 3.94 100 8.30 18.3

1600 SBE

14 2.40 61 6.61 ± 0.08 168 ± 2 1.18 30 3.94 100 18.31 465 3.46 88 6.61 168 3.54 90 5.51 140 11.43 25.2

16 2.40 61 6.61 ± 0.08 168 ± 2 1.18 30 3.94 100 16.42 417 3.46 88 6.61 168 3.54 90 5.51 140 12.02 26.5

18 2.40 61 6.61 ± 0.08 168 ± 2 1.18 30 3.94 100 16.42 417 3.46 88 6.61 168 3.54 90 5.51 140 12.70 28.0

2400 SBE

14 2.40 61 6.42 ± 0.08 163 ± 2 1.18 30 3.94 100 18.31 465 3.46 88 6.61 168 3.54 90 5.51 140 14.83 32.7

16 2.40 61 6.42 ± 0.08 163 ± 2 1.18 30 3.94 100 16.42 417 3.46 88 6.61 168 3.54 90 5.51 140 15.42 34.0

18 2.40 61 6.42 ± 0.08 163 ± 2 1.18 30 3.94 100 16.42 417 3.46 88 6.61 168 3.54 90 5.51 140 16.10 35.5

2800 SCE

14 2.40 61 6.46 ± 0.08 164 ± 2 1.38 35 4.13 105 18.31 465 4.06 103 6.22 158 4.13 105 6.06 154 14.65 32.3

16 2.40 61 6.46 ± 0.08 164 ± 2 1.38 35 4.13 105 16.42 417 4.06 103 6.22 158 4.13 105 6.06 154 15.24 33.6

18 2.40 61 6.46 ± 0.08 164 ± 2 1.38 35 4.13 105 16.42 417 4.06 103 6.22 158 4.13 105 6.06 154 15.92 35.1

3500 SCE

14 2.76 70 7.28 ± 0.08 185 ± 2 0.24 ■■6 4.13 105 18.31 465 4.06 103 7.20 183 4.13 105 6.06 154 16.92 37.3

16 2.76 70 7.28 ± 0.08 185 ± 2 1.38 35 4.13 105 18.31 465 4.06 103 7.20 183 4.13 105 6.06 154 18.14 40.0

18 2.76 70 7.28 ± 0.08 185 ± 2 1.38 35 4.13 105 18.31 465 4.06 103 7.20 126 4.13 105 6.06 154 19.01 41.9

LM Series - Silicone (50 shore A) Performance Data

Nominal *Max **Max Continuous Allowable Dynamic Torsional Stiffness*** Relative

Torque Torque1 Torque2 Vibratory Power CTdyn Damping

Rating TKmax1 TKmax2 Torque Loss 10% TKN 25% TKN 50% TKN 75% TKN 100% TKN Ψ

TKN TKW PKV

Size in-lb Nm in-lb Nm in-lb Nm in-lb Nm HP Watts in-lb/rad Nm/rad in-lb/rad Nm/rad in-lb/rad Nm/rad in-lb/rad Nm/rad in-lb/rad Nm/rad

LM800 ■6,200 700 ■9,290 1■050 12,400 1■400 ■2,480 280 0.14 105 ■19,500 2■200 ■21,200 2■400 ■24,800 2■800 ■31,000 3■500 ■40,700 4■600

1.15

LM1200 ■8,850 1■000 13,300 1■500 17,700 2■000 ■3,540 400 0.20 150 ■31,900 3■600 ■34,500 3■900 ■39,800 4■500 ■49,600 5■600 ■65,500 7■400

LM1600 12,800 1■450 19,500 2■200 25,700 2■900 ■5,100 580 0.30 220 ■42,500 4■800 ■46,000 5■200 ■53,100 6■000 ■66,400 7■500 ■87,600 9■900

LM2400 17,700 2■000 26,600 3■000 35,400 4■000 ■7,080 800 0.40 300 ■70,800 8■000 ■77,000 8■700 ■88,500 10■000 ■111,000 12■500 146,000 16■500

LM2800 24,800 2■800 37,200 4■200 49,600 5■600 ■9,910 1■120 0.48 360 186,000 21■000 ■20,400 2■300 221,000 25■000 288,000 32■500 376,000 42■500

LM3500 28,300 3■200 42,500 4■800 56,600 6■400 11,300 1■280 0.60 450 ■113,000 12■800 123,000 13■900 142,000 16■000 177,000 20■000 235,000 26■500

Notes:■■ n■■■*■indicates:■Tmax1■is■the■maximum■accelerating■value■for■transient■torque■spikes■during■the■normal■work■cycle,■for■example,■form■accelerating■through■

a■resonance■during■starting■and■stopping■or■clutching.

■n■■■**■indicates:■Tmax2■represents■the■absolute■maximum■peak■torque■allowable■during■rare■occasions■such■as■during■a■short■circuit■of■a■gen-set■or■

incorrect■synchronization.

■n■■■***■indicates:■The■silicone■material■creates■a■progressive■stiffness■characteristic■dependent■on■load.■These■values■have■the■tolerance■of■±■15%.

Note:■■ n■■■■**■indicates:■The■rubber■element■can■be■positioned■closer■to■or■farther■from■the■ﬂywheel■within■the■limits■shown■for■this■dimension,■while■maintaining■

full■engagement■with■the■outer■drive■ring.■Hub■length■L1■is■adjustable■as■well■with■corresponding■changes■to■mounting■length■dimension■C.■

Note:■■ n■■■*■indicates:■SAE■J620■Flywheel■Dimensional■Data■can■be■found■on■page■T-41.

Temperature Factor St2SI

for Cont. Vibr. Torque Tkw

and Allowable Power Loss Pkv

0.5

120 140 160 180 200 220 240

Degrees F

SILICONE

St2SI

Tkw

Pv< Pkv * St2SI

Tw< Tk w * St2SI * (1/Sf)

Pkv

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Torsional

LK Series

Overview / Performance Data

The■LK■Series■coupling■is■a■simple■two-piece■design■consisting■of■an■element■and■

hub.■■The■couplings■are■designed■to■be■used■with■engine■driven,■ﬂange■mounted,■

hydraulic■pump■systems.■■The■couplings■are■“torsionally■stiff”■enabling■hydraulic■

pumps■and■similar■equipment■with■low■mass■or■inertia■to■operate■below■critical■

speeds.■■The■“torsionally■stiff”■LK■Series■coupling■raises■the■critical■speed■above■

the■operating■range■providing■a■system■free■of■harmful■torsional■vibrations.■■The■LK■

Series■is■ideal■for■hydrostatic■drives■on■construction■equipment,■cranes,■forklifts,■

excavators,■vibratory■rollers,■tractors,■etc.■■Virtually■all■engine■driven■hydraulic■

systems■in■the■low■to■mid■power■range■can■use■the■LK■Series■coupling.

Element Features

■■Fiberglass■reinforced■polyamide■construction

■■Impact■and■oil■resistant

■■–40°■to■320°■F■temperature■range

■■SAE■J620■ﬂywheel■sizes■6.5■through■14■and■various■metric■sizes

■■Universal■element■can■be■mounted■to■and■adapter■plate

■■Blind■assembly,■no■lubrication

Hub Features

■■High■quality■powdered-metal■construction

■■Splined■hubs■available■with■L-LOC■clamping■system

■■Engagement■“dogs”■are■slightly■crowned■to■avoid■edge■pressure■when■slight■

misalignment■occurs

■■Available■in■bore■with■keyway■and■spline■connections

Typical Applications

Applications■where■a■hydraulic■pump■is■directly■connected■to■the■engine■such■

as■wheel■loaders,■hydraulic■excavators,■vibration■rollers,■fork■lift■trucks,■concrete■

cutters,■compact■loaders,■asphalt■ﬁnishers■and■mobile■cranes.

LK Series Performance Data

Size

SAE Flywheel

Size

Nominal Torque

TKN

Maxium Torque

TKmax

Maximum

Speed

Dynamic Torsional Stiffness Relative

Damping

CTdyn

0.25TKN 0.50TKN 0.75TKN 1.00TKN

in-lb Nm in-lb Nm RPM lb-in/rad kNm/rad lb-in/rad kNm/rad lb-in/rad kNm/rad lb-in/rad kNm/rad Ψ

LK80 — 1,080 ■125 2,880 ■330 6,000 Consult■Lovejoy

0.4

LK100 6.5,■7.5,■8,■10 3,540 ■400 7,080 ■800 5,000 490 ■55 550 ■62 800 ■90 1,060 ■120

LK125 10,■11.5 7,080 ■800 14,160 1■600 4,500 1,370 ■155 1,590 ■180 2,800 ■315 4,070 ■460

LK150 11.5,■14 10,620 1■200 26,400 3■000 4,000 2,300 ■260 2,480 ■280 3,700 ■420 7,950 ■900

LK150D 14 21,240 2■400 58,200 6■000 4,000 4,600 ■520 4,960 ■560 7,400 ■840 15,900 1■800

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Torsional

LK Series

Dimensional Data

1-Piece Flange 2-Piece Flange

Universal + Plate

4, 6 and 8 Dog Patterns

Dependent on Size

LK Series - SAE J620 Flywheel Application Dimensional Data

ID OD BC FL HD LTB* OAL ML

Nominal Min Bore Max Bore Flange Dimensions Hubstar Assembly

Dimensions

Torque SAE Flange Number & Dia Flange Dimensions

Rating Flywheel Style of Holes Thickness Mounting Length

Size in-lb Nm in mm in mm Size in mm in mm in mm in mm in mm in mm in mm in mm

LK100 3,540 400 0.563 15 1.563 40

6.5 1-PIECE 8.500 215.9 7.875 200.0 6■x■0.33■

6■x■8.5■

0.55 14

2.56 65

— — — — — —

1.26 32 1.34 34 0.906■±■0.118 23+/-3■

7.5 1-PIECE 9.500 241.3 8.750 222.3 8■x■0.33■ 0.55 14

2.20 56 2.28 58 2.284■±■0.118 58+/-3

8 1-PIECE 10.375 263.5 9.625 244.5 6■x■0.41■ 6■x■10.5■ 0.55 14

1.89 48 1.97 50 1.969■±■0.118 50+/-3

10 1-PIECE 12.375 314.3 11.625 295.3 8■x■0.41■

8■x■10.5■

0.55 14 — — — — — —

LK125 7,080 800 0.813 20 2.125 55

10 1-PIECE 12.375 314.3 11.625 295.3 8■x■0.41■ 0.79 20

3.35 85

1.89 48 1.97 50 1.969■±■0.118 50+/-3■

11.5 1-PIECE 13.875 352.4 13.125 333.4 8■x■0.41 0.19 20 1.97 42 2.05 46 1.417■±■0.118 36+/-3

LK150 10,260 1■200 1.000 25 2.750 70

11.5 1-PIECE 13.875 352.4 3.125 333.4 8■x■0.41■ 0.79 20

4.33 110

2.09 53 2.09 53 1.299■±■0.118 33+/-1

14 2-PIECE 18.375 466.7 17.250 438.2 8■x■0.50■

8■x■12.7■

0.19 5 2.09 53 2.09 53 0.984■±■0.118 25+/-1

LK150D 21,240 2■400 1.188 30 2.750 70 14 ** 18.375 466.7 17.250 438.2 8■x■0.50■ 0.19 5 4.33 110 2.05 52 2.13 54 0.984■±■0.118 25+/-1

Notes:■■ n■■■*■indicates:■Other■shorter■or■longer■hub■lengths■available■for■special■requirements.

■n■■■**■indicates:■LK■150D■uses■2■Zytel®■elements■in■parallel■with■1■steel■plate.

Notes:■■ n■■■*■indicates:■LK80-6-135■pilots■on■the■O.D.

■n■■■Dimensions■for■universal■elements■(for■non-SAE■ﬂywheels,■etc.).

LK Series Universal Elements Dimensional Data

G H TH E OD BC D A S

Hole

Pilot Number Diameter

Size in mm in mm in mm in mm in mm in mm in mm in mm of Holes in mm

LK80-6-106 0.55 14.0 0.38 9.7 0.19 4.8 1.12 2.84 5.910 150 5.118 130 3.600 91.4 4.173 106 5 0.33 8.4

LK80-6-135 0.39 9.9 0.61 15.5 * * 1.00 25.4 5.315 135 3.937 100 3.629 92.2 5.315 135 3 0.41 10.4

LK100-165 0.39 10.0 0.79 20.0 0.16 4.0 1.34 34.0 6.850 174 5.591 142 4.921 125.0 4.921 125 3 0.49 12.5

LK100-072 0.39 10.0 0.79 20.0 0.16 4.0 1.34 34.0 7.870 200 6.496 165 4.330 110.0 2.835 72 3 0.65 16.5

LK125-195 0.39 10.0 0.55 14.0 0.24 6.0 1.18 30.0 7.680 195 6.496 165 5.315 135.0 5.135 135 6 0.49 12.5

LK150-230 0.39 10.0 0.47 12.0 0.20■ 5.0 1.06 27.0 9.060 230 7.874 200 6.500 165.0 6.496 165 8 0.49 12.5

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T-40

Torsional

Pump Mounting Plates – SAE J744

Dimensional Data

Spacer Rings

Spacer■rings■are■available■

for■all■SAE■bell■housing■

sizes■(1,2,3,4,5,6).■■The■

rings■provide■additional■

space■standoff■from■the■

engine■ﬂywheel■housing■and■

the■pump■mounting■spacer■

plate.■■The■spacer■ring■will■

provide■the■necessary■area■

between■the■ﬂywheel■and■

the■pump■for■the■proper■

torsional■coupling.■■When■

ordering■spacer■rings,■

specify■the■SAE■bell■housing■

size■and■required■thickness.

0.13 0.13

Pump Flange Spacer Ring Pump Mounting Plate Unitized Spacer Ring and

Pump Mounting Plate

Pump Mounting Plates - SAE J744 Dimensional Data

GF LF GS LS S TH* OD EBC EP

Flywheel Pump Mounting Plate Spacer Spacer Ring Bolt Circle Pilot

Housing Plate Minimum Diameter

SAE J617C Thickness

Size in mm in mm in mm in mm in mm in mm

10.88 22.4 0.75 19.1

Based■on■customer■request

0.88 23

21.75 552 20.875 530.2 20.125 511.2

20.88 22.4 0.75 19.1 19.25 489 18.375 466.7 17.625 447.7

30.50 12.7 0.44 11.2

0.63 16

17.75 451 16.875 428.6 16.125 409.6

40.50 12.7 0.44 11.2 15.88 403 15.000 381.0 14.250 362.0

50.50 12.7 0.44 11.2 14.00 356 13.125 333.4 12.375 314.3

60.50 12.7 0.44 11.2 12.13 308 11.250 285.8 10.500 266.7

Notes:■■ n■■■*■indicates:■Minimum■thickness■speciﬁed■in■chart.■■Total■thickness■is■based■on■customer■request.■

■n■■■For■use■with■hydraulic■pumps■having■standard■SAE■mountings■and■spline■shafts.

Note:■■ n■■6■bolt■universal■pump■mounting■design■is■available■and■is■typical■standard■design.

Hydraulic Pump Mounting - SAE J744 Dimensional Data

2 Bolt Design 4 Bolt Design

d PBC D T d PBC D T

Pump Pilot Bolt Pump Thread Pilot Bolt Pump Thread

Mounting Dia Circle Face Dia Size Dia Circle Face Dia Size

Flange in mm in mm in mm in in mm in mm in mm in

A-A 2.00 50.80 3.25 82.6 7 177.80 5/16-18 — — — — — — —

A3.25 82.55 4.18 106.4 7 177.80 3/8-16 — — — — — — —

B & B-B 4.00 101.60 5.75 146.0 8 203.20 1/2-13 4.00 101.60 5.00 127.00 8 203.20 1/2-13

C & C-C 5.00 127.00 7.12 181.0 10 254.00 5/8-11 5.00 127.00 6.38 162.05 10 254.00 1/2-13

D6.00 152.40 9.00 228.6 14 355.60 3/4-10 6.00 152.40 9.00 228.60 14 355.60 3/4-10

E6.50 165.10 12.50 317.5 16 406.40 1-8 6.50 165.10 12.50 317.50 16 406.40 3/4-10

F7.00 177.80 13.78 350.0 18 457.20 1-8 7.00 177.80 13.87 352.30 18 457.20 1-8

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Torsional

Pump Mounting Plates – SAE J620

Dimensional Data

Features

■■Available■in■ﬂat■and■spacer■types

■■SAE■housing■sizes■1■to■6

■■SAE■hydraulic■pump■size■A■to■D

■■DIN■hydraulic■pump■pilot■and■bolt■patterns■also■available

■■Provides■easy■mounting■to■engine■ﬂywheel■housing

Typical Flywheel Housing Combinations

SAE LF Series LK Series SAE J617C Flywheel Housing

J620D

Flywheel

Size Size Size 6 5 4 3 2 1

6.5 8■thru■28 100 s s

7.5 8■thru■28 100 l l

88■thru■30 100 s

10 8■thru■140 100,■125 l s s

11.5 16■thru■140 100,■125,■150,■150D l l s

14 28■thru■250 150,■UNIV l

18 250 UNIV l

Notes:■■ s■indicates:■Preferred■combinations.

■l ■indicates:■Optoinal■sizes■available.

Pump Mounting Plates - SAE J620 Flywheel Dimensional Data

P1 BC P2 J H G D T

Nominal Tapped

Clutch Holes

(ﬂywheel)

Size in mm in mm in mm in mm in mm in mm in mm Qty Size

6.5 8.500 215.90 7.875 200.03 7.25 184.2 0.38 9.7 0.50 0.5 1.19 30.2 5.00 127.0 6 5/16-18

7.5 9.500 241.30 8.750 222.25 8.13 206.4 0.50 12.7 0.50 0.5 1.19 30.2 — — 8 5/16-18

810.375 263.53 9.625 244.48 8.88 225.4 0.50 12.7 0.50 0.5 2.44 62.0 — — 6 3/8-16

10 12.375 314.33 11.625 295.28 10.88 276.2 0.50 12.7 0.62 0.6 2.12 53.8 7.75 196.9 8 3/8-16

11.5 13.875 352.43 13.125 333.38 12.38 314.3 0.88 22.4 1.12 1.1 1.56 39.6 8.00 203.2 8 3/8-16

14 18.375 466.73 17.250 438.15 16.13 409.6 0.88 22.4 1.12 1.1 1.00 25.4 8.00 203.2 8 1/2-13

16 20.375 517.53 19.250 488.95 18.13 460.4 0.88 22.4 1.12 1.1 0.62 15.7 75.00 1905.0 8 1/2-13

18 22.500 571.50 21.375 542.93 19.63 498.5 1.25 31.8 1.25 1.3 0.62 15.7 10.00 254.0 6 5/8-11

21 26.500 673.10 25.250 641.35 23.00 684.2 1.15 29.2 1.25 1.3 — — — — 12 5/8-11

24 28.875 733.43 27.250 692.15 25.38 644.5 1.25 31.8 1.25 1.3 — — — — 12 3/4-10

JWJISCJSFMCGHPGDDTSPUJVSDRSLDED

JW JIS CJ SF MC G HP GD D

SP UJ VSD R SLD ED

300 630-852-0500

JWJISCJSFMCGHPGDD

SPUJVSDRSLDED

JW JIS CJ SF MC G HP GD D T SP UJ VSD R SLD ED

T-42

Torsional

Pump Mounting Housings

Overview

Pump Mounting Housings

Pump■mounting■housings■are■required■to■mount■pumps■

on■engines■that■do■not■have■an■SAE■ﬂywheel■housing.■■

Lovejoy■offers■pump■mounting■housings■for■the■following■

engines.■■All■are■available■with■SAE■pump■mounting■pilots■

and■bolt■patterns.■■Custom■mounting■pilots■and■bolt■patterns■

available■upon■request.■■Housings■are■made■of■high■strength■

Aluminum,■designed■to■support■the■weight■of■the■hydraulic■

pump■without■the■need■for■a■rear■pump■support■mount.■■

The■LK80■and■LK100■are■available■to■match■the■ﬂywheel■

options■for■the■various■engines■and■can■be■paired■with■the■

appropriate■housing■to■provide■a■complete■kit.

Deutz® FL1001

Kubota® Super Mini

Perkins® 103-10

Shown■with■LK100

Cummins® B3.3

Shown■with■LK100

Ford® LRG 425

Shown■with■LK100

Kubota® Super 03

Shown■with■LK100

Ford® VSG 413

Shown■with■LK100

Kubota® Super 05

Shown■with■LK80

Perkins® 104-22

Shown■with■LK100

Torsional Catalog

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