TM 11-900 1942 PE-75A AND PE-75B

8/10/2019 TM 11-900 1942 PE-75A AND PE-75B

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P u b l i c D o m a i n ,

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i g i t i z e d / h t t p : / / w w w . h a t h i t r u s t . o r g / a c c e s s_ u s e # p d - g

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8/10/2019 TM 11-900 1942 PE-75A AND PE-75B


DEPARTMENT,

une9,1942.

PE-75-B

yshighvoltageswhicharedanger-

dbyoperatingpersonnel.When

ysgroundeverypartbeforetouching

n.Paragraph

nit2

nsand

s.

ailure13

7

itsPE-75-A

cturers,.20

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nit2

nsandweights3

75-AandPE-75-Bareself-

capableofsupplying2,500wattsofa-c

ough50 feetofcord.Figure1shows

twomodelsare alikeexceptfor

lminorparts;the differentsuffixletters

rements.Forthesakeofconvenience,

outthismanualonlyto thepower

erstoodthatthesameinformation

PE-75-B,unlessotherwisestated.

iallyofa self-excitedgenerator,

a gasolineengine.Thegasoline

etewithitsfilter boxandoutput

dtypespringmountings.Theout-

ckreceptaclesandtwobindingposts.

ngcrate,aplywoodcollapsiblecarry-

ectionoftheunitduring transportation

esize,equippedwithahingeddoor.

thiscase.NeithercordCD-^409nor

itPE-75—A.However,forconven-

yingoneor twoofeither,inthe topof

reincludedinthis manual,givingthe

atingtheunit inthecarryingcasewhen-

cousticalnoiseproducedbythepowerunit.

runit.—a.Gasolineengine.—

HomeliteCorporationmodelHTR.

air-cooled,horizontallyopposedtype,

.Astartingrope withgripisused

tion.

saHomeliteCorporationmodel

cycle,single-phase,a-cgeneratorof

tesafilterbox assemblyattached

bly.—Thisassemblyisdesignedfor

dgeneratortomakean integralunit.

using,spring steelskidmountings,

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5-B3

nand outofcase).

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PE-75-B2

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onsandweights.

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PE-75-B

er.

nasthepackingcratehas been

mageduringshipment.Shouldany

hisfactimmediatelyandprocure

ns(596) fromthesixcatches(594)

atchestopermitremovalofthetop.

onfrontof case(fig.1).(The

undcase.)Thenremovethefront

ratorlimitations.—Thegener-

0wattsat110volts,60-cycle,single-

nitshouldnotbe overloadedmore

beoperatedcontinuouslyatany

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CD-409or CD-415.—(1)Setcase

quipmenttobeoperated.Follow

sine below.

-415ifsupplied(seepar. 1)from

thatitprojectsbeyondfrontof case,

rmitfasteningcatchestocentercatch

.)

ge1.

A,readyforoperationincase.

on,plug thecordintooneofthe

hefilterbox(430).Attachground

1)onfilterbox (fig.7).Currentmay

satthesametime,providingthe

ed capacityofthegenerator.

aropeningattop.(See fig.5.)

rdCD-409or CD-415.—(1)Re-

paragraph4c;thenreleasecatches

alofthesesections.

itheronoroffthe baseasrequired.

four wingnutsholdingunitto base.

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PE-75-B

nstructionsine(l) to(5),inclu-

linedin6(3) aboveande(6)below.

sconnectedtobindingposts.—

oveexceptforattachingcord.To

movesideofcase,if notalreadydone;

over(445).(Seefig. 7.)Attach

then exposed,runningthewires

Seefig.19.)

ngcordstotopofcase.

on:Beforestartingforfirsttime,

byhandtoinsurethat shaftturns

fueltankcap(455,fig.4)and fill

SAE40motor oil,thoroughlymixing

ancanor othercontainer.Forbest

high-test).Lubricationforthe entire

withgasoline,anditis extremelyim-

lymixedwiththegasoline.Pourthe

fig.4).

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tfully(turnedcompletelyina

orestartingengine.

2)beneathfueltank asindicated.

oncarburetorplungerbutton(485,

etimes.Incoldweather,operatepump

cticallynodangeroffloodingengine

atorend,showingpowercordinplace.

21)counterclockwiseonpulley

est(453,fig.1)andpull hard,givingthe

y,enginemaykickback.Repeat

Afterenginestarts,it maybeneces-

atingthe primingpumpplungerat

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PE-75-B5-7

alters,untili twarmsupenoughto

out1 minute.

ytheload tothegeneratorand

seuntilthedesired voltageis

ouldrequirenofurther attention

eadjustmentoftherheostat ifthe

pbutton(564,fig.1) andhold

esummarized.— (1)Fillwithfuel

pping.

nitoperatedincase.—(1)Dis-

osidesand remove.Alsorelease

e.Thentakeoffsides.

,and draintank.

makingsure thatallsections

r engineend.

ed,totop (seefig.6).Also

uslyremoved.

tchesareright anddowelpinsin

)Disconnectpowercordorcords.

,and draintank.

ombase,attachbymeansoffour

bove.

FPARTS

8showsapermanentbarmag-

enorthpoleandenteringthe south

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PE-75-B7

(fig.9)is usedinsteadofaperma-

se isthatapermanentmagnet

eriodof time.Also,thestrengthof

ledbythenumberofturns ofwire

fcurrent(amperes)suppliedthrough

0)thefieldpoles(437) serveas

winding(414)actsthesameasthe

themagnetinfigures8 and9.

uttingthe linesofflux"ofthe

oltageinthe armaturewinding

recommutator(404).Thecarbon

din thebrushholderassemblies(423

oltagefromthearmatureasit rotates;

makethevoltageavailableatthe

ld polesaremagnetizedbythe

ssupplied byconnectingthemto

eneratorsof thistypearecalled

netizedinthefactorytheyretain

residualmagnetism")eventhough

indingwhenthegeneratoris not

rtstorotate,the armaturewindings

uxofthisresidualmagnetism.This

agein thearmaturewindings.This

gthoftheresidualmagnetismin the

ageinthearmature.Thisaction

ecomesuptospeed untilthefull

reached.

arts ofageneratorandillustrates

field windings.Thelinesoffield

ughtheairgap betweenthearmature

ure,backthroughthe airgapintoa

backto thestartingpoint.Asthe

windingscutthroughtheselinesof

geinthearmaturewindings.

ngoperationofthe generatorbut

nwhenthegeneratorisstoppedbe-

whichremainsinthe polepieces.

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cesshouldalwaysbeputbackin

nthesamerelativepositionas before

ismagnetized,itbecomeseithera

nnotbechangedexceptbythe appli-

ltageas fromastoragebattery.

timesdifficulttochangethemagne-

vebeenin serviceforsometune.

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PE-75-B8

—a.Inallinternalcombustion

tsofthefouroperationsofintake,

haust.Inthe2-cycleengineasused

ycalled"two-stroke"cycle)these

nonerevolutionorone downstroke

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Theupstrokein thishorizontally

ssimultaneously,isconsideredthe

wardthecylinderhead.)(See

tureandfieldwindings.

xtureofgasolinevaporandair.

movementofthe pistondrawsinair.

arburetor,wheregasolinevaporis

plosivemixture.

gprinciple.

E-75-A,thechargeisfirst drawn

nanup strokeofthepistonandon

eadyinthecylinderiscompressed.

nceit compressesthechargeinthe

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PE-75-B8

servestodrawasecondchargeinto

cylinderis thenignitedandthe

erstroke.Atthe sametunethe

sthechargeinthecrankcase.

okeofthe piston,whenthegasesin

ned,thepistonuncoverstheintake

hargeinthecrankcasetoflowthrough

sametimetheexhaustport is

heintakeportand thebafflebuilt

lowinginto thecylinderfromthe

sesahead,forcingtheseburnedgases

mpletesthecycleintwostrokes,

argeinthecylinderis compressed

thecrankcase.

nindependentrotaryvalveand

thechargefromthe carburetorto

ependentintakevalveallowsfor

ylinderadmissionandexhaustports

ance.Theadmissionandexhaust

onedthat properscavengingofwaste

anyincomingcharge.Furthermore,

aryintakevalve,theintake ofthe

smooth,evenflowof airthroughthe

rfectcarburetion.

eansof oilmixedwiththefuel

l filmonallmovingparts.During

ngine,allthemovingparts subjectto

mblies(551),cylinders(513 and514),

mainbearing(545),rotaryintake

542))aresubjectedtoa sprayofoil

0).This pressureisashigh as3

uchpressurethe oilvaporisforced

ingperfectlubrication.

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PE-75-B9-10

aperorcardboardwillremovethe

sresultingfromlongidleness.

404)andcollectorrings(405)

utatorandcollectorrings,.remove

7). Thecommutatorshouldrequire

hoursof operation.Itneedbe

carbonized,whentoomucharcing

rtengineandthen insertastrip

0)(notemery),%inchwide,ontop of

fleadpenciltoguide sandpaper.

awayfrom directionofrotation)and

ncilon sandpaper,againstcommutator,

rosswidthuntilcommutatorisclean.

equirecleaning.Cleanonlyif

dureonbothrings asoncommutator,

chwide.

).—(1)Brushesshouldbeinspected

lacementonlyifbrush springrides

headcoverplate.

shapeofcommutatorandcollector

insureperfectelectricalcontact.

cord-cbrushes,no specialcarein

However,whennewbrushesare in-

ratevoltagethed-cbrushesonthe

nsimultaneouslybyexertingalight

od,fora fewmomentswithnoload

edand intermittentornocurrentis

curs,proceedasfollows:

hieldedhigh-tensioncables(557,

finesandpaper(00to8/0) (not

cbrushes,and adjusttopositionwith

gsure sandpaperliesflatoncom-

shspring shouldbeinplaceto

Noadditionalpressureis required.)

bout%inch byturningstarting

paperinpositionwith pencil.Con-

appearson sandpaperforfullwidth

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ftup brushtorelievetensionand

hippingoncommutator.Repeat

stripofsandpaper% inchwide

me,roughsideto brush,brushspring

collectorring;rockengine backand

sandreleaseinthe samemanner

olders.Ifbindingordrag occurs,

nchwith sandpaperfromtheside

ndingmarks.

owerunitatleastoncea month

ss,andproperoperation.Ifitdoes

olts,60cycles,consulttroublechart,

phs13to 16,inclusive.

er unit.Servicingshouldbe

rsonnel,suppliedwithadequate

ingbyagivenindividualshould

ofperformingproperly.Itis possible

nattemptingtolocateandrepaira

tservicemancouldcareforin a

isequipmenttosuchan extentthatit

potforrepair.

iresnolubricationotherthan

seepar.5e(l)),andoilingthe magneto

averyfew dropsofSAE30oil

ion,orifthe magnetoisdismantled

obesaturatedbut oiledjustenough

whenpressedbetweenthefingers.

isdetrimentaltothecontactpoints,

nitfailure.—a.Engine.—

eperformancearefuel,sparkplugs,

ression.Iftroubledevelops,check

oublechart,paragraph176,andthen

rderlisted. Beforeremovingor

makesurefirstthatthe failureisn't

k.

ginetroubleitis alwaysadvisable

oseeif thiscorrectsthedifficulty.

lugsinwhile checkingfurther.

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PE-75-B13

duetoimproperadjustmentof

rackedordirty porcelain.(See

rrectthedifficulty,lookfortrouble

elow.)

iderangeoftypesto suitthe

fferentengines.Itisextremelyim-

roperheatrangebeusedwith the

ChampionJ-10commercial,or

becausedbyan excessiveamount

orgradeofoil.Forcorrecttypeof

he ignitionisahigh-voltageflywheel

completeassemblyatthe endofthe

tsofamagnetmountedon the

coils(499)with laminatedcores

g(541),togetherwithcontactas-

esparkplugsfiresimultaneously.)

6.

hafedorbrokencableswhichare

tentmisfiring.

park,oronlya weakone,isobtained

ubleis mostlikelytobein the

reofthesepartsis notacommon

oneorbothto obtainastrongspark

cables,connections,andcontact

ovedafterthestartingpulleyis

ragraph96(1).If coilsaretobe re-

nthe backofmagnetocover(539

alfof cover.Removebothhigh-

pushingupwardonbakeliteter-

overawayfromthemagneto,

hecoverawayentirelybyremov-

theseoperations,donotpullon

removeit fromthecoils;todoso

rminals.Ifawireis accidentally

ewthetwopartsoftheterminal,

edwireprojectingbeyondtheinsu-

mpactly,andreassembletermi-

wireshouldextendbeyondthe

ovedbylooseningthe twoset-

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ctingleads.Havecoilsandcapacitor

r suitablesignalrepairagency.

ly,butonlyas anassemblywith

reversedismantlinginstructions,

l-holdingscrews.Whenreplacing

theterminalsto lineupwithconnec-

verintoposition.Thisshouldinsure

urethatterminalsfit overcoil

utsonboth endsofhigh-voltage

illretainits magnetismindefinitely,

beexpectedfromthis source.Ifit

t.

ph12.

).—(a)Thecarburetoris thefixed

mentwhatever.

fromthefuel tankbycrank-case

roughthefeedline (493)insidethe

itis vaporizedanddrawnintothe

rburetoris accomplishedbypull-

lungerbutton(485,fig.13)on the

wardfromthetopof thecarburetor.

iththefuelsupply(providingthere

ock(558,fig.2)is open)removethe

yandcranktheenginetosee iffuel

beingdeliveredbutdoesnotreach

(locatedabovehexplugs) andclean.

burnozzle withimproperscrew

wdriver(578,fig.22).Cleannozzle

eawire,as scratchesorburson

fectcarburetion.Ifthe nozzleis

ngnozzlebesure touseanozzle

nbarrel.

othe carburetor,removeplugat

oseeiffuel flowstothatpoint.If

nectfuelline(529,fig. 2)attankand

tting(457,fig.4) ontanktopermit

oncarburetorintakemonthly.

.Thendipupperendofscreenin

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mportantthatthe cylinderports

nexcessof carbonwillreducethe

e.

ovingtheexhaustmanifolds

g.22) forlooseningexhaustmanifold

lyclosedduetocarbon,remove

gofexhaustports,pistons,and cylinder

xiliary(548,fig.2),is badlycar-

Alsoremoveexhaustmanifoldfrom

pectforcarbon.Ifbadlycarbonized,

rcarbonizationcanbestbedoneby

eroutputis increasedwithnew

ufflers,asmaybenecessary.

ldmakecontactwithcylinder

ce.Iftheendclearance,wheninthe

fringsare stuckingrooves,replace

carbonfromgroovescarefully.

rreplacementringsshouldbe between

ewithfeelergage;0.002-inchfeeler

chfitsnugly).

bebelow3poundsonworn rings

lacementrings.Thetensionmaybe

iredtoclosethe endgapwhenone

latformof aspringscalewiththe

onscale.Applypressureat180°

mblesincylindersmakesure that

nthesamesideas theintakeports

on rings,followinstructionsbelow.

partsare furnishedonlyasan

elyfittedtopistonsto giveverylight

laceonlyif scored,ifringgrooves

ooseinbosses.

rsare torunfora periodofat

reapplyingloadtogenerator.The

tenginefromracing.Ifthereis

402and403, fig.10)whileidling,

tendoffirsthour applyload(after

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PE-75-B13

removed),25percentofratedcapacity,

rcentatend ofeach15-minuterun-

mentsaretobemadeon thegovernor.

he requirementsoftheindividual

attentionduringthelifeof theengine.

ernorsmaylookthesame,thereis,

weightsandspringsusedwhichcon-

s arenotcommonspringswhich

especialheat-treatedspringsindi-

s completeassembles.Itis

berof thegeneratorforwhichthe

aph17a,andthencheckthefollowing

ctorrings(405).—Refertofigure10

fertofigure10 andparagraph106.

gure10.Thetension ofthefour

ouncesandthetwod-csprings8 ounces.

eIor II).—Ifthegeneratorfails

he followingordertocheckthe

kingsurethatall ofthed-canda-c

twiththecommutatorandcollector

);thatthebrush springshavethe

dthatthe surfacesofthecommutator

condition(see(1)above).

nectfilterbox(430)fromgenerator

rcuit,testNo.4,tableI orII.If

efilter box(par.14a(l)(6)),remove

oseconnectionsandbrokeninsulation.

uitofwiresorterminals,removethe

inclusive)andrepeattestNo. 4on

naltocapacitorcam.Incaseof

nalexceptground,replacecapacitor

itorleadsfromoutputterminalson

eachcapacitorterminaltoground.

neitherterminal,replacethecapacitor

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PE-75-B13-14

dthefilterdisconnected,remove

7) andchecka-coutput,testNo.1,

ckd-cbrushvoltage,testNo.2,

plypressuremanuallytobothd-c

epositivecontactwithcommutator.

ollowingthisprocedure,stopengine

stNo.3,tableI orII.

adinginfinity,testNo. 3,tableI

nearthed-cbrushholders forbroken

t,removeyokeandcoilassembly

ntirefieldcircuitfor brokenorloose

individuallyforcontinuity.Re-

nes.

gbutno a-cvoltageindicatesthat

atortothecollectorringsisbroken

uremustbereplaced.Thisisan un-

ge,whiled-cfield continuityisall

ndmustbe replaced.Thisisnota

kcarefullyallotherpossibilitiesof

shes,d-cfieldcircuit,andfilter,before

ne.

suppliedwiththeequipmentwill

ntlingandassemblyoperations(see

1)To removeyoke(448)andcoil

wholdingterminalcover(444)to

oouterbrass nutswhicharethen

gtheleadstofilterbox(430).

hefilterboxto thegeneratoryoke

filter box.Theboxcannowbe

ig.10)outofsockets(2 d-cand4a-c).

brushhead,insertscrewdrivers

ng(452),andgentlyprythe yokeaway.

—Iffiltercapacitor(409,fig.19)is

movebothcoversof thefilterbox.

capacitorterminalsandtakeoff

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411) tofreethegroundlead.

capacitorbrackets(427,fig.19)

ox.

08)willthenbeexposedfor exam-

connections.

g.10).—Removebolt(415)atend

sarmatureto enginecrankshaft

n(569)and thenjackscrew(576).

permit.Removejackscrewand

epeatoperation.Againrepeatoper-

cessively.Armatureshouldcome

0).—Beforedismantlingengine,

din troublechart,paragraph176.

d514),pistons(551),andconnecting

(a)Removemuffler(547)assemblies.

oltagecablesatsparkplugs.Also

fmagnetocover(540).Remove

iresatthecoilend bypushing

soneat atime.Removetophalfof

pull onshieldedcablestoremove

ll pullwiresoutofbakeliteterminals.

outofitsterminal,referto paragraph

tank.

ngthemagnetobracket(536)to

neto(535)andcarburetor(476)can

13).

stobedismantledlater,loosenstartingpulley

assembly.

oassemblysee(2) below.

dershields(517,518, 519,and

thecapscrews(515)holdingcylinder

bearing(504) cannowreadilybe

nectingrodassemblytakenout.

crankendofrearconnectingrod

e ofcrankcase.Removecapscrews

halvesofconnectingrodtogether,

tingrodassemblyandhalfof roller

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PE-75-B14

ininghalfof thisandbottompart

moved.

nedfromcylinderports,pistons,and rings(554).

properly,replaceaccordingto

badlyworn,or pinsareloosein

sandpins.(Seepar. 13a(6).)

gnetobracketassembly.—(a)Remove

startingpulley(560).

prearofmagneto.Theentire

wberemoved.

556) fromthemagnetoshaft

sureline(492,fig.13)frommagneto

holdingcarburetortobracket,thus

buretorassembly.

strikingonthreadedendwithwood

nnowberemovedfromthe magneto

brassbearingretainer plate(473)

nd544) byinsertingbearing

ringanddriveout. (Donotdisturb

—(Important:Beforedismantling

rendasinaabove.)

nd washer(528)fromrearof

handthread.)

isheldin thecrankcasebyspecial

emustberemovedbeforetheshaft

ewscanbe exposedbyturning

sectionofthe crankthrowis

rremovalofthe screws,placethe

nkcasesothatit fitsovercrank

ndscrewit intocenterofshaft.

ig.15)thecrankshaftwillbe drawn

eflywheelstillsecurelyinplace in

aringwillusuallycomeouton the

ninthe crankcase,itmaybe

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PE-75-B14-15

ewtoavoidcrampingthe bearingon

incaseofbearingfailurewherenewbearing

seefig.19).—(1)Armature(414}-—

—Ifdefective,replace.

wornso thatbrushtensionspring

eadofbrush,replace.(Seepar.106.)

ph136(3).

nections;ifdefective,replace.

Pistons (551)andcylinders(513

e0.002inch;maximum,0.005inch.If

tonsarescored,replace.(Seepar.

eifstuckin groovesorworn.(See

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dmagnetobracket(586)assembly.—

avebeenremovedfrommagneto

),placetherearbearinginto position,

(577). Theninsertbearingspacer

ngwith sametool.

erplate(473)and fastenholding

wheel.

in (a)above,insertbearingtoolat

driverear bearinguntilspacerbetween

)on magnetoshaft(542),place

non shafthead.Placethreesprings

vernordownonshaft,at thesame

tsothatit clearsshoulderonshaft.

gnetobracket.

semblytocrankcase,turnmagneto

withcrankpin onendofcrankshaft.

kcasewithcapscrews.

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PE-75-B

3) onmagnetobracket.

goperations(par.14a(2)(a)to

magnetohousing(541)is properly

he magnetobracketwiththeslot

tocover(540),seeparagraph13a

Reversedismantlinginstructionsas

ey(416)is inplaceincrankshaft

ure(414)onshaft.

2,500wattsat110voltsis notobtained,see

s.—

-

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Documents

TM 11-900 1942 PE-75A AND PE-75B