Tm 9-1651 Data Transmission System m3, january 1942

8/13/2019 Tm 9-1651 Data Transmission System m3, january 1942

1/78

E

TEM,M3

Publ

icDomain,Google-digitized

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athitrust.org/access_

use#pd-google


2/78

A'-x\

TEM,MtX

1943

42,ischangedas

ed). a.Lubri

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3/78

engine,SAE30,wheretheprevailing

ve32 F.,andoil,engine,SAE10,wherethe

ngeisbetween32 F.and0 F.Below

shouldbefollowedto providetheengine

eoilfor coldstarting:

ll"markandwhileengineis stopped,

or dry-cleaningsolventequalto20percent

ankcasecapacity.

utestomixoil anddiluentthoroughly,

elofcrankcaseoilon oillevelgagestick.

"Full"mark.Itis advisabletomarkthis

eforfuture reference.

ratingperiod,checkoillevelwithengine

mal"Full"markopgage,add necessary

E10(undiluted)to bringlevelupto"Full"

saryquantityofgasolineordry-cleaning

emarkrecordedin(3)above.

venormal"Full"markongage,add


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TEM,M3C1

unengine5to 10minutestomixoil and

1,Jan.8, 1943.)

TARYOFWAR:

TINGOFFICE:1942


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RDEPARTMENT,

anuary25,1942.

E

TEM,M3

r22-23

24-26


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E-DATATRANSMISSIONSYSTEM,M3

spublishedprimarilyfor the

ofOrdnancemaintenancepersonnel.

pplementsthetechnicalmanu-

arm.Itcontainsgeneraldescriptive

ctionsformaintenanceandrepairof

cepersonnel.Figureswhichaccompany

ntandmethodoffasteningof eachof

eequipment.

VIIattheendof thismanual

atureListsandotherpublications

nt.


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sandrepeaters6

pole8

cator,M3ll

ransmissionsystem,M3,is

aftartillerytotransmitfiring data

neouslyfromremotelylocatedfire

ow-the-pointerindicatorsonsome

unts.

ystemcanbeusedwith either

AA director,M4,withoutchangeof

plug-and-receptacleassemblies.

usedwiththeon-carriage

atransmissionsystem,T8E3,ifcable

andproperelectricalconnectionsare

tothedatatransmissionsystem

htfinder.Theseare describedin

als.

ntofthedatatransmissionsystem,

solinedriven,electricgener-

essarypowerforthe system.Two

hdatatransmissionsystem.Oneunit

an emergencysourceofpowerincase

use.

detheazimuthindicator,M3,

ndfuzeindicator,M3.Thesearecon-

ctionboxanddistributionbox tothe

carriage.

onnectsthedirectorandpower

andplugassemblies.


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10/78

0INLONG

CEWITHSPECFXS-150

IDENTIFICATIONS

ITHFINISHNQIBA SPEC51-70-1

NOUSREPEATER-ASSEMBLY

S

STRANSMITTERANDREPEATER


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chreactwiththemagneticfieldcre-

o developtorquesinsuchdirection

tharmaturestothesamerelative

reetomove,is thusbroughttoward

.Adampingdeviceineachrepeater

ationoftherepeateraboutitsfinal

nchronizewiththe trans-

ed,regardlessoftheir relativepo-

ofpower.This featureresults

d"self-synchronous"andmakesitsu-

tatransmissionsystems.

medata todifferentpoints,

ultipletoanappropriatelydesigned

.

bleofcontrollingits re-

sionofl/2 understaticconditions.

uiredaccuracyis3/4.Wherethe

erthanthatpossiblewitha single

transmittedarebrokenupintotwo

e"fine",thesepartsbeing trans-

paratetransmittersandreceivers.

onofdata,thethreearmature

oflowresistanceandtheindividual

;thecablesprovidedareproperlyde-

on.It isnecessarythatfield

randrepeaterbe equalized;separate

ovidedonthegeneratingunitwhereby

vailablefor thedistantunitsto

ropintheline.

sedto transmitdataaccurately

mechanicalload.Eachrepeateris

w-the-pointerdrivefortheappli-

tercarriesanelectricallydriven

venindexwhichisconnectedtothe

sbroughtinto alinementwiththe

ymeansofahandwheelorother drive.

atersmaybecomedamagedbyim-

ialspeed,thuscausingthemtorun

mayoccurifa dampingdevicebecomes

nuallyspun orforcedfromsynchro-

ack;

he continuousheatingcaused


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NBOX-ASSEMBLY


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VEDRAPD4671

NBOX-COVERREMOVED


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CE-DATATRANSMISSIONSYSTEM.M3

xcessiveheatinganddamagemayre-

leof25 ormoreexistsfora con-

.The mainjunctionboxas-

4and5)includes adecagonalshaped

666).Acover(C56709)sealsthe box,

saccesstotheinternalwiring ofthe

orrepair. Theboxisportableand

venientpositiontoaccommodatethe

ndthedirector. Rubbergasketsunder

under thereceptaclesmakethe

esareprovided:

ssembly(C56702),painted

werplant.

assembly(C56703),painted

ctor.

assemblies(C56703),painted

uns.

g(C56708),supportedonfour

ontactplatesandbinding postsfor

ewiring,diagram(Figure22).

NDl9-POLE.-a. Thereceptacle

gures6and7)includes arectangular

537),mountedonaspecialbracketbolted

age(Figurel2) ofeachgun.The

ceptaclecoversareprovidedwith

.ForwiringseeFigure23.

emblycontainstwobanksofl0

ontheboxcoverand connectingthegun

,brassconduit) withthel8andl9-

tothebox.

ssembly(C56702)isconnected

he l8-polereceptacleaccommodates

datatransmissionsystems,M2,M2A1,

Thedistributionboxassembly

sofa rectangularcastaluminumbody,

nectionsanda cover.Thepacking

B)accommodatesthecableleadingto

econd connector(CGB289orequal)

receptaclebox.Thethirdcon-

sfor thecable(Bl37025)totheele-


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NDS

EMOVED

OX,18AND 19POLE-A SSEMBLY


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AD

OX,18AND 19POLE


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TOR

S

NGNQCK05

BOX-ENDELEVATIONAND


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ksprovidedinthis boxare

hewiringdiagram(Figure23).The

dtomatchthemarkedcableterminals.

watertightandisboltedto

n.

.Thegunjunctionbox assembly

consistsofacylindricalcastalumi-

cover(A45422).Connectionsonthebody

acleassembly(C56703)whichleadsto

kinggland(Figurel0,SectionC-C)

ablefromthedistribution box,thecon-

eadingtotheazimuth indicator,and

equal)leadingtothebreechlight.

cleassembly(Bl356l4)accommodatesa

4)reducesthell5-voltline

mps.

ommodatetheelectricalcon-

ththewiringdiagram.Terminalplates

foridentification.Forwiringsee

ONINDICATORS,M3.-a.Theazimuth

onindicator,M3,(Figuresl4tol8)

ointerinstruments.Eachconsists

epeaterandone"fine"repeatere-

director.Eachrepeaterhasaset

dialsorpointerindexes.Operation

esmechanicaldriveswhich,inturn,

matchthe datasuppliedbythedi-

torandelevationindicatoreachhas

sedinawatertightcaseprovidedwith

dowthroughwhichthescalesandindex

azimuthindicatoris locatedonthe

,andtheelevationindicatoronthe

23.

Figuresl4tol8) supportstwo

stheinnerdial (A44264),whichis

valsfrom0 to6,400mils.Theputer

ndreadagainstanindex(A46477),

Bl36685)gearedtoaworm(A46469,

veisgearedto thegunmount.

ovesthe outerdial.Aknob(A46446,


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LY

ONBOX-ASSEMBLY,


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GNO.CH05)

EAD

ONBOX-COVERREMOVED


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NTOFDISTRIBUTIONBOXAND

CARRIAGE


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DELEVATIONINDICATOR,


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661X.2756

a>i

36X3150

11X.3543

598X3937

NINGSCREWFORSCALE



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OVED



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mitsrotationof therepeaterthrough

he zeropositionfororientation

director.RotationoftheKnobis

accidentalshifting.

tersupportstwo pointers

y,drivingtheinnerpointerdisk

avedanindex.The outerindex(A46454)

6686)whichmesheswithanothergear

urel6).Thisgear(A46468)is mounted

sgearedtothe sameworm(A46469)as

sthe outerdialofthe"coarse"indi-

(Bl36688)isgraduatedat 2mil

s.Aknob(A46446)permitsrotation

outl5 oneithersideofthe zero

hthetransmittersin thedirector.

toavoidpossibilityofaccidental

l5and l6)areboltedatthe

47l),whichare linkedtotheknobs

tateina bracket(D28863)onrotation

s oftherepeatersareboltedto

loatina yoke(B136690).Theyokein

tsina boredrecessofthecase

structioninsuresalinementofdials

theshaftendplateof therepeater.

er-alllengthoftherepeaters,etc.,

sfloatingtype ofconstruction.

ts match-the-pointerindex,

umbersofthe "coarse"dialandscale

nt.

broughtouttothe terminal

SectionE-E,andFigure23) which

ngthecover(A46456) towhichthename

-a.Thefuze indicator,M3

allyarepeaterwithtwo pointer

trically.Thefuzeindicatorisbolted

erpointerdisk(A46425)turnswith

erepeateris activatedbydataelectri-

director.Theouterpointer index

connectedbyspiralmiter gearsand

The fuzesetterisoperatedto

e indicator.Theentiremechanism


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1-ESS

TOR,M3-SECTIONA-A


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ATOR,M3-SECTIONEDVIEWS


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case,providedwithanonshatter-

whichthedialand indexpointermay

and dialpointerarefilledwith

aduationsandnumbersofthefixed

namel.

idedfor alternateuse.One

edto2lseconds(Figurel9), andis

otherscale(Bl36406)iscalibrated

dwiththemechanicalfuze.Thescales

ur fillisterheadscrews.The"S"

e"safe"or unsetpositionofthefuze.

ionD-D,Figure2l)rotatesthe

oneithersideofthe zeroposition

erwiththedirectortransmitterat

re20,SectionA-A)sealsthe

aringopeningintothe bodyofthefuze

dmoisture.

rebroughtouttotheterminal

etothepackingglandandthe exterior.

reachedbyremovingthecover(A46456,

a.(l)Twelvecable,plug,and

25feetlong,No.950,20-conductor

o 29)areusedin thesystem.These

ollows:

deranddirector.

andmainjunctionbox.

plantandmainjunctionbox.

injunctionboxandthefour guns

erchangeable,thecablear-

dfromthatindicatedabovetobest suit

nsandconnectedequipment.Seepara-

eptacleassembly(Bl37024)

ssembly(Figure26)whichhas acap

tness,etc.,225feetof20-conductor

III,andanotherl9-polereceptacle

e25)whichalsohasacap.

edtofingersandterminalsin

ding(Figure29)andplug-and-receptacle


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ORRECEPTACLETERMINALINSULATION

SSIONCABLE

CTORS

LS

CTORS

ACE

CE

E

E

E

E

ACE

CE

TORTRANSMISSIONCABLE- COLORCODING


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onductors(Figurel)inbrass

ereceptacleboxandthe distribution

igure23).

s,34incheslong,(Bl37025)

tributionboxandelevationindicator,

boxandazimuthindicator.SeeFigure

e,No.670,inbrasstubingis

tionboxandgunj unctionbox.

-and-receptacleassembly,43

urel)isused betweengunjunction

eendis attachedtotheterminal

n accordancewiththecolorcode

gs.Ontheotherend isthel9-pole

942l)whichplugsintothegunjunction

and-plugassembly,46inches

forthebreechlight, iswiredtogun

ndL2and hasaplug(A486l8)for

htreceptacle.

-and-plugassembly,37inches

setter lightiswiredto terminal

eindicator(Figure2l,SectionB-B).

mblyhasaplug(A486l8)forinsertion

uzesetter light.

.-a.General.-The generating

rthedata transmissionsystem,M3.

ofa 2-l/2kva,ll5-l25volt,60-

nbyal0horsepowergasolineengine.

uppliedwitheachdatatransmission

heldinreserveincase ofabreak-

ed.Eachunitisenclosedina metal

eliftedandcarriedshortdistances

achunit isabout800pounds.See

atorhasthe followingcharac-

.,ll5-volt,60-cycle,l200rpm,

field.Thegeneratorisratedat

rfactorand operatessatisfactorily

ctor.Thel5-voltexciterwhichsup-

volvingfield,ismountedinte-

matureshaft.Theexciteralso car-

rrentforthestoragebattery.Radial


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S


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UNIT,M3TIMEDELAYRELAY


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E

TEM,M3

d.Afanmountedon thearmatureshaft

tectthecoilsagainst?overheating.

ine specifications:

tinblock,withwater

ylinderhead,

aluminum

arginggener-

mfrontengine

2-l/2x 3

mber

n.-58.8

ead

n.l/8

6

rings3

-5/l6

.l-3/8

3/8

ar


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ooking

ngrodbearings

minumspecial

numspecial

etric

l-l7/32bore

nt

rhead,andcrankcase.-The

asearecastinonepiece.Water

thofthebore.Threelarge main

shellsfor tophalfofbearingsand

rhalf ofbearingssupporttheshaft.

pscrews.Endthrust iscontrolled

nbearing.Thecylinderheadiswater

eforcleaningcarbonandgrindingvalves.

stons.-The connectingrodsand

bearingsandarebolted together.The

epistonpintoavoid scoringthecylin-

ons areeachgroovedfortwocom-

ringandhavebronzebushingsfor

cialalloypistonsare used:thebronze

he alloyisasuitablebearing for

eautomaticchokeofelectro-

re37,is operatedbyanelectro-

Thisdeviceismountedon theexhaust

tothecarburetorchokeleverbya

netisconnectedinthestartercircuit.

pressed,currentflowsthrough the


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matureleverispulleddown,thusgiving

henthestarterbuttonis released,

ughtheelectromagnetandtheamount

regulatedbythe temperatureofthe

mofthethermostat.

almechanicaltypegovernorof

testhespeedoftheengine.Thegover-

eedat l,200rpm+.60rpm (60+.3

cycles)issatisfactoryforthesystem.

wandaheadofthe carburetor.Itis

by anadjustablerod.

n,and packless-typecircu-

ngwatertothe enginejackets.Ca-

allon.Apetcockinthelowerpart

noutlet inthebottomofthe radi-

The fanblowsairoutwardthrough

eis storedinthe5 gallon

nd.Afloattypefuel levelgageis

toffcock,astandardautomotive

eenandasedimenttraparepro-

wthetank.Intakeairis filtered

rtermotor.- A6-volt,l00

oragebatteryanda6-voltstarting

board(Figure34)ispro-

uipment:

tainedswitchforilluminating

tterycurrent(-20,0,+20am-

50poundsper sq.in.).

dicator.

volts).

amperes).

ype,withcontrolknob.(Total

umcurrentl0amperes.)

e,singlethrow,withoverload

n


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amperes)and2sparefuzes

pswitch,radialknifetype,

geatdirectorterminals.

ountedonendcoverbelowpanel

-(l)Autotransformer.-The

5)isratedat2 KVA;60-cyclea.c.;

econdarytapsforll5,l25,l35,

stransformer,controlledbythe

esthevoltageatthe directortermi-

rs.Theterminalvoltageof thegener-

eldrheostatandisindicatedbythe

board.

timedelayrelaymountedonthe

rmitsexcitationofthe transmitters

voltagewhentheyarestabilizingat

Therelayissetfor 5secondsdelay

relay.

xiliaryrelayhas contacts

loadcurrent.It ismountedon

.The auxiliaryrelayisoperated

mresistorisconnectedin

o reducethelinevoltageduring

s shuntedbytheauxiliaryrelay.

ree50-mfd.,ll0-volt,60-cycle,

densersconnectedtotheoutputtermi-

provethepowerfactor.A l5-ampere

ndensers,cutsoutthecondensersin

ircuited.

xinthe generatingunit,M3

rkplugwrench,ascrewdriver;apair

setofopen endwrenchesincloth

rank,avalvelifter,anda revo-

ment.-Avoltmeter,ammeter

ngcasesaresupplied.


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ialpowersupply20

atatransmissionsystemhasbeen

hedirector,heightfinder,etc.,its

aticandiscontrolledbythe function-

ghtfinder.

ITS.-Althoughnotessentialfor

efollowingconsiderationsshouldbe

ebetweenthemainjunction

e approximatelythesame,eventhough

gunis different.

nationtheheightfinder

directorposition.

ot bemorethan600feetfrom

uldnot exceedl,200feet.

a.The leadsarecolor-coded

sasindicatedinthe tablesforl3-

able(Figure29)and20-conductortrans-

receptaclealinethekeys and

ontheplugsandreceptacles

nsuretightconnection.

interchangeableandhence

aclesarenotpaintedto correspond

ctstwounitstheplugs andre-

e connectedarepaintedonecolor.

hegeneratingunitmust never

acleotherthanthe yellowoneinthe

"PowerPlant".

Lubrication.-Checktheoil

fill ifnecessary.Ifoilis dirty,


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l.Aplugis providedfordrain-

therpipeand replacethebreather

evelisindicatedona bayonettype

thesame sideofthecrankcase;the

icatesafullcrankcase,2/4halffull,

SECTIONVI.

th clean,fresh,alkali-

withantifreezesolution:

tifreezesolutionsareavail-

olutionsmustbeprecededbycareful

ewhetherornottheymayprovedetri-

ine,orhose.A solutionofdenatured

utappreciabledamagetothecooling

eshowsproperproportionsforthe

tPercentSpecificBoiling

t(F.)

ntageofalcoholthantemperature

sultinoverheatingofthe engine.

ingsystemis approximately

withstandardgasoline.

entoavoidspilling gasoline.The

allons.Fuellevelisindicatedon

checkedbyinsertingacleandrystick

dlevelindicatedthereon.Open

mpere-hourstoragebattery,

ullycharged,inthe compartment

it andfasteninplacewiththe

ttheredleadtothe redorpositive

thenegativepost.Theignition

ntilreadyto start.


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CE-DATATRANSMISSIONSYSTEM,M3

ratingindoors,piping

austfumesoutof doors.Connection

peprojectingthroughtheradiator.

besatisfactory.

NG.-a.Makesure themainswitch

N".

soonastheenginestarts,

ndallowengine torunandwarmup

othe loadbyturningthemain

wscurrentto passthroughthel0-

delayrelayandauxiliaryrelayshunt

stor.The terminalswillthenbe

en runningforfifteenortwenty

iththe revolutioncounterprovided.

ectedtothe unit,theengineshould

50rpm.

penthemainswitch..This

e generator.Thenturntheignition

MMERCIALPOWERSUPPLY.-Thissystem

rilyfromanyordinarycommercial

powerofll0tol20 volts,60-cycles.

madeby terminals4to5 inthemain

s5and5A connectedtogether.A

penbothsides ofthecircuitmust

must beprotectedbya25-amperefuse.

beappliedgradually,thesystemmust

nstartingandthepowermust becut

yrepeater"runaway"i.e.,runasa


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onismadeforthepurpose of

ofthedatatransmissionsystem,

mentsarerequired,andthe remedies

eabilityandproperfunctioning.The

aguide:

r-

yparts

issing.

facces-

l,

sand

check-

ubri-

para-

ra-

el

ose

onand

eepara-

t

and

ase

aling

ses,

ugs,

eepara-


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mission

ormalin-

stru-

er-

bsence

maged.

ins

ould

eck

erwater

r

nsfor

s.

ht.Check

the

wsand

act.

ondition.

be

shand

ould


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AIR

y22

SEMBLY.-a.General.-Disassembly

ormaloperationarecoveredin SECTION

dassemblymayberequiredfor clean-

Repairsmustbemade onlybyquali-

ecomponentpartsofthe datatrans-

cannotbemadewiththe facilities

turnof theparttothe baseshop

bemadebyreversingsteps takenin

eindicated.Partsshouldbemarkedto

embly.

emovedfromthevarious boxes

ecessaryforexaminationandchecking

stbereplacedandproperlysealed

tingcheck.Whenopeningboxeswhich

time,it willoftenbefoundthatthe

htlytothelid. Tofacilitatebreak-

eenprovidedtopermittheinsertion

xercisednottoinsertthetool far

ket.Caremustbetakento avoidnick-

thelidorbody,thus spoilingthe

necessary.Markingsonleads

thewiringdiagramsto insureproper

dicators.-(l) Togainaccess

507,Figurel8) removethecover

ockissecured,to thecasebytwo

teriorofthe-caseremovethe

Thewindowsmaythenbewithdrawn

heretainer(C56987)securedby flat-

y,anauthorizedsealingcompound

ndows.

smfromthecase atthispoint

ddisconnectingofnecessaryleads

firstthe twonuts(A46449,Section

dby ascrew(A46450)andwasher.

mthecasethetwo adjustingknobs,


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AR

6447).Removethepackinggland(A46464,

ents.Removethethreebolts(BCAXlCC,

lift themechanismcarefullyoutof

epeaterfromthe mechanismwith-

B,Figurel5)andsecuringnut.Remove

t(A46475)andlockscrew.Slide

ndthetwo ballbearingsofftheshaft.

(BCGX3FG).Removetheyoke(Bl36690).

472).Indisengagingthewormgearfrom

l6)itmay benecessarytowithdraw

uredbythreefillisterhead screws

shaftshouldbe disengagedfromthe

vingoutthe securingtaperpin.

ewingifnecessary,tocleartheworm

aterfrom themechanismwith-

C,Figurel5)andits securingnut,and

vetheyoke(Bl36690)ifthishas not

oarserepeater.Removeadapter

aterandunscrewthenut(A46475).Re-

etainer(A46473)andtheadapter

pairsinvolvingdisassembly

seshopor arsenal.

Accesstotheterminal

btainedbyremovingthe cover(A46456,

ismfromthecase,unscrewthe

8865,Figure20)to thecase.

rfromthe mechanism,withdraw

ure20),splitwasher(A38607)and

movetheindexsupport(A46426).Re-

ckscrew.Drawthemitergear (Bl36680)

e shaft.Unscrewthebracket(A46435)

thenwithdrawtherepeater.Remove

46428)removetheretainer

(A46433)andheadlesslockscrew,and

thetop.Removepackinggland(A4643l).

pairsinvolvingdisassembly

seshopor arsenal.

eengineand auxiliaryequip-


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ts.Thepartsand theirfunctionsare

nedin thiswork.Thegenerating

tothe extentindicatedbelow:

theusingarm.

blyofaccessoriesascarburetor,

ributor,generator,starter,fuelpump,

asremovalofcylinderhead,

nectingrods,crankshaft,oilpan,

erpump.

tor;controlpanel,removalof

yoftheinstrumentsthemselvesisnot

eturnedtoa baseshoporarsenal

ested.

T.-a.General.-Thetests and

low-areinadditiontothosemadeas

eeSECTIONIII.Theelectrical

owinvolvesadjustmentoftherepeater

ndingtransmitter.Themechanical

owinvolvesadjustmentforagreement

calesofeachunit.

norderthat thevarious

andtransmittersindicatealike,itis

beinitiallysynchronized.

arilyaccomplishedatthe

on electricalzerowhentheele-

szero.Units ofsystemssoinitially

ngedbetweensystemswithoutfurther

hefield shouldberequired

rlyinitiallyset onelectricalzero,

hadone ormoresynchronousunits,or

ngtheadjustmentreplacedordisturbed.

storequiresuchadjustmentasecond

spectedassoonas possibletode-

angeor failureinsomecomponentis

ectionsinparticularshouldbe care-

fferences(oftenmultiplesof60)

ngconnections.

by whichthesynchronizingad-

ed.Thefirstis tosetallunits, both

s,onelectricalzerowhenthevalue

smittedis zero.Thesecondmethod


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AR

oconnectedunits(transmittersor

othetransmittedand receivedindi-

withoutregardtoelectricalzero.

theadvantageofprovidingcomplete

sandshouldbefollowedwhencon-

ocedureordinarilyrequiresless

ateaccesstothe interiorofthe

bleinsomecasesforfield adjust-

ythesecondmethodshouldbe readjusted

nasconditionspermit.Thegeneral

calzerosettingsisgivenin (


64/78


rotorisnotdisplacedfromits equi-

alforces.

leequallywell totransmitters

tisseldomthattransmitterswith

countered,andforthatreasonthe

cribedin(4)aboveis necessary.

gingtheelectricalindications

edbelow.Theadjustmentis made

dupandthepoweron. Whenshifting

isnecessary,observetheprecaution

naway",thatis,runat ahighspeed

ation.Afteradjustmentis completed,

nicalfreedom,withpoweroff,first

lightlybythe fingers,thenby

urther checkbydisplacingtheindex

onedirection,thaninthe other,

rnin bothcasesistothe sameindi-

ndexesareofthin metalandmust

dicator,M3.-Adjustmentof

edfirst byturningtheknobspro-

seandfine repeatersthroughan

hiftingofthescalesshouldnot be

loosenthethreescrewsclamping

turningbyhandfor acoarsead-

enusedto effectcloseadjustment.The

en purposelymadestifftoavoidacci-

ustmentofthe fuzeindicator

or elevationindicator,M3,except

sed.

tment.-Initialmechanical

rsismadeon thegunmounts.The

betweenindicatorsandthemechanisms

mentofthegunpermitorientationof

.

ooting.-Thepossibletroubles

smissionsystemmaybedividedinto

troublesarisingina systemin-

whichtherehasbeen nochangein

ond,troublesexperiencedwhenassembling

acingoneor moreofthecomponent

edwithsystemsofthefirst-mentioned


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AR

ytoincludeincorrectelectrical

fthesecondclassification,almostany

ybe encountered.Whenattempting

yarisein thefield,generalpro-

arilybetolocatethefault, tode-

characteristicsobserved,andtotake

entmeansavailabletorestore the

outregardtomaintainingthewiring

rddiagramsnortoretaininginter-

omodified,however,shouldberestored

wiring diagramsassoonascircum-

lreadysetonelectricalzero should

possible.Onrepeaterswithaccessi-

pleandofteneffectivetestisto

smallamount(sayl)firsti none

If theindicationreturnedtoin

e,mechanicaldifficultyorade-

ted.Someofthemore commontroubles

uses,andcorrectivemeasuresareout-

thecorrectivemeasuresaretemporary

oroughrecheckofconnectionstoin-

wiringdiagramassoonas possible.

transmitterandoneor more

ationbeingcorrect.-Thesystem

onized.Followtheprocedurepertain-

thetroubleisexperienced.

otatein oppositedirection

er.-Thedirectionofrotationofa

byinterchanginganytwoofthe arma-

3).If theelectricalzeroindi-

retained byconfiningtheinter-

, theotherpossiblecombinations

ositionby+.l20. Thischangemay

enthetransmitterandtherepeater.In

d elevationtransmitters,whichhave

alatthetransmitterterminals(in

reverseall fourrepeaters;re-

inals(in thegunjunctionbox,re-

onbox)willreverseonlythe single

affectingthedirectionsoftheothers,

all outofsynchronismduring

nditionis characterizedbyajumpy

swhilethe transmitterrotatesat


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e,theirregular!lyappearingat

ointonthedial.Troubleof thisde-

erthe transmitterortherepeater

er electricalormechanical.

tarepeater,allother repeaters

eaffectedsomewhat,butthefaulty

iencethegreatesteffect.Whenthe

ected,byremovingtheplug(cutoff

g)atthereceptaclebox,mainjunction

only)gun junctionbox,ascon-

esystemwillfunctioncorrectly.If

ccessfulthefaultyunitmaybe

elimination.

tatransmitter,allrepeaters

notbepossibletoeliminate

ers.

istypemaybe foundineither

dusuallyconsistofa defectina

ringwhichwillcauseacircuit

ngularposition.Theinterruption

orarmaturedependingonthemanu-

cationmaybefoundbytheuseof

erandammeter.

fthistypeareordinarilyen-

aters.Similarfaultsmayoccurat

ll notcausediscrepanciesbetween

data;theymay,however,causeajumpy

whichmaybeaccentuatedatthere-

ymayalso causeerrorsincompu-

tedbyaccuracytests.Thegeneral

omemovingpartisbinding onsome

thedialor indexatsomepointis

milarfault,calleda "highspot",

bearing.

ndisencountered,locateand

ordancewiththeforegoing,andcorrect

,takesuchstepsaswillrender

onsideringthetimeandfacilities

aultswithinsynchronoustrans-

irereplacementoftheunit,an oper-

derabletime.Toreplaceaunitin

mfree fromfloatingparticlesof

nicaltroubleintheazimuth,ele-


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AR

etected,thedials shouldbecare-

e.Theremaybesufficientplaybe-

bto shiftthedialslightly.When

heunititself orothercom-

gduetoexcessivedisplacementfrom

ortoaffecttheaccuracyofother

uldbedisconnectedimmediatelysoas

erof thesystem.

ail tosynchronize,remaining

onusuallyindicatesanopencircuit

etransmitters,repeaters,orcon-

occurintermittentlyduetoa cable

hasmallregionof elevationorazi-

s characteraresometimes

eldomoccurconsistently.There-

atureisnoticedbutdisappears

completerecordshouldbemadeofthe

atingthetroubleshouldit recur

ayoftenbelocatedbyob-

softhefaultandusing theohmmeter,

see(3)above).

echeckedreadilywiththe

stancereadingindicatingcontinuity.

atbothendswhichare placedcon-

Theohmmeterthenisusedtoindi-

ductorfromtheterminatingdevice

ondingdeviceattheotherend;lack

conductorandallremainingconductors

eis detectedandlocated,the

etaken.Ifthefault isina portable

nishedare notinuse,substitute

yone.If theforegoingprocedure

tuteaspareconductorinthecable,

onductor.Itmaybe possibleto

ductorandsubstituteanexternalwire,

e.Ordinarily,No.l4rubberinsulated

ousewiring,maybeemployedsatis-

houldneverbeused inplaceofone

oundresistanceisvariable,causing

raneousvoltagesmaybepickedupdue


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slagbehindthetransmitterin

-This conditionindicatesex-

rinsufficienttorqueatthe repeater.

foundtovarywiththespeed orac-

mezerowhenatrest.

eorthevoltageat thegun

incorrect.An opencircuitinthe

erorrepeater(butnotboth)will

oftorque,the repeaterthenassuming

apartwithequalfacility.

calloadsuch asatightbearing

hiscondition.

sremainstationaryforatime,

andagainremainstationary.-This

sashortcircuit betweentwoarmature

companiedbyan abnormallyloudhum

s.Powermustberemovedfromthe

nthisfaultisnoticed.Thiscon-

bya reactingtorqueonthetrans-

uryto delicatemechanisms.Procedure

)above.

o rest,butoscillatesabout

ndicatesadefectivedampingmecha-

hecaseofmultiplerepeaters,all

fected,butthe defectiverepeater

aterangle.

arge,it maybepossible

e,followingtheaverageratherthan

withthefollow-the-pointerdrive.

toolargeforthis,or when

fotherconnectedrepeaters,the

asunserviceable.

trequiresa replacementof

whichisto beperformedonlyby

el.

efectivedampingdevice,the

closelyand,if itstartstorun as

movedfromthe systematonce.

ngunit.-(l) Governor.-(a)

tthe factoryandshouldrequirelittle

speedisl,200rpm,whichcorresponds

rrentforwhichthe systemisdesigned.


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AR

tisfactorilywhenthefrequencyis

65cycles,orl,l00tol,300 rpm.

uredoperatingunderfull-loadcon-

ftertheunit hasbeenrunningat

stability.Measurementsarecon-

ftextendingfromtheoil-pumphousing,

erfurnishedwiththeunit andan

ervalrecorder.Ifthespeedis be-

o changeisnecessary.Ifbeyond

uldbe adjustedusingthescrewpro-

ostmotionbetweenthegover-

rleverand thesepartsshouldoperate

esepartsmustnotbe allowedtorub

ecoverofthegeneratingunit.No

orshouldbeattemptedifthe speeddoes

rgesor "hunts".Suchacondition

onor bindinginthegovernormecha-

arburetion,orby anobstruction

dconnectingthecarburetorlever

beendisconnectedforanyreason,be

ecarburetor-butterflyvalvewideopen

s normalpositionwithenginestopped.

ressureshouldbebetween

dspersquare inchunderfull-load

comeworninservice,thepressure

wervalue;this Indicatesthatmore,

noadjustmentshouldbemade.The

verbeoperatedwithapressureof less

inch.Adjustmentisbymeansofthe

theoil-pumphousing.Turnthescrew

ssure.Alwaysloosenthelocknuton

,andtightenwhenadjustmentiscom-

eautomaticchokeisofrugged

equirelittleattention.Whenthe

mbienttemperature),thethermalarm

ounterclockwiseposition,thebutter-

xtremeclockwise(closed)position,

ravelbetweenopenandclosedpositions.

wshouldbesetfor about5/8inchtravel

hechokeelementhasbeendisconnected

ermalelementhas beenunhookedfrom


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retoreturn thethermalelementto

eadjustmentis completed.Should

itmaybefoundthattheouterend of

adeonefull turnandagainbecomes

ntstop.Thisconditionwillbe readily

eck,andnecessitatesthattheadjust-

inwardsothethermalelementcannot

erpointsthatshowa grayish

dhave agapof0.020+.0.002 inch,

rgage,require noadjustment.Should

twillalsobe necessarythattheybe

stoneandrealined soastopresent

hotherwithfullcontact.

take(Hot).006

xhaust(Hot).006

25

.l25

uide,exh.&int..00l .00l5

ceinguide .0008.00l

0l.00l5

0l5.0025

learance.002.0025

2.004

l2.025

0l.00l5

ndclearance.005.0l0

earance.00l5.002

endclearance.00l.002

undcrankshaft.008.0l5

rankshaft.008.0l5

klash.002.003

.000.002

02

08.0l0

.002.0025

oove.00l.0025


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ON.-Theotherend oftheportable

neratingunitmustneverbeplugged

excepttheoneonthe mainJunction

ant"andpaintedyellow.Thispower

ectedtoadirector,heightfinder,or

t.Failuretoobservethis precaution

esynchronoustransmittersand

eightfinder,or on-carriageindi-

seriouslydamagethemechanismsin

hedatatransmissionsystemis

mumofattentionand carebeyondrou-

tdamagetoitscomponentparts.Peri-

variousunitsshould bemadetoin-

ontinueinsatisfactoryoperation.

ductorportablecablesupplied

e subjectedtorepeatedkinkingor

ofgivingthecablethebest possible

asized.Avoidbendingthecableona

tochafeagainstanymovingobject.

estorun overthecables.

umulateintheplugsor re-

esarenotconnected,allplugsand

closedwiththecoversprovidedsoas

e.Whenthecablesare connected,

ptaclesmustbemechanicallysecured

provided.

rimentaltorubberandcare

sedtoseethatthe cablesarekept

orecablesin acooldarkplace,

esnotin useshouldbestoredon

totapetheend ofanyofthe

cables,userubbertapeonly.

periodicallyforopen andshort


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ngine ofthegeneratingunit

of automobileenginesandrequires

swithoutmeansforconducting

utside.

tankwiththeunitrunning.

toavoidspillinggasoline,es-

ithinabuilding.

and filterscreeninthegaso-

tainedaftercleaningthe

floatvalve,thepassagefrom the

e venturi,andtheneedlevalve.

ovingcapscrewsinthe sideofthe

mproperlyfilledwith water

eproperconcentration.Avoidthe

whennotneededandof agreaterper-

quired.Occasionallyflushoutthe

water.

ryterminalsoccasionallyand

ewaterinthestoragebattery

plates.Afterthebatteryhasbeen

distilledwaterto thecells.See

battery.

tleasteverytimethecrank-

severedust conditionsitmustbe

anAirMazecleaners,swishupand

n ofwastecrankcaseoil,shakeoff

olinemustnotbeused underanycircum-

units alternatelytoinsure

operatingconditionshouldpre-

arance.Ifacommutatorbecomesdirty

rseclothor, Ifnecessary,withNo.

merypaper orclothonthecommutator

omeincontacttherewith.

acedwhenbadlyworn.They

ecommutators.

cleanedandsetoccasionally.


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73/78

rs.-Shouldanyrepeaterstartto

amotorata highrateofspeed,cut

y.


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74/78


ued)

Symboll065) forprevailingtemper-

,engine,SAE l0(NavySymboll042)

ebetween32 F.and0 F.Below

ilwith l0%gasolineorkerosene,

ntainthe diluentatthisratio since

ffduringoperation.Inextremely

mstancespermit,drainthecrankcase

andthenheat theoilbeforere-

wherethehandcan justbeinserted

ilevery30hoursof operation.

ftinstrumentsandmachineguns.


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sts27

LATURELISTS:

n,M3SNLF-l78

clatureListsareas

atelistofSNL'S

ancePublications

chgunmateriel

materialsTM9-850

eightfinder,Ml TM9-l623

rector,M3TM 9-l650

rector,M4TM 9-l655

nder,MlTM 9-2623

r,M4TM9-2655


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ORGASOLINEENGINE

STMENT

SCRIPTION

RIPTION

SCRIPTION

SCRIPTION

19-POLE,

y

TMENT

nM--

PLY,OPERATIONFROMPublicDomain,Google-digitized

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77/78

DELEVATION,M3

y2256-57

0

y2257

0

,3l

4

AR22-2356-66

y2256-58

-66

7l

3

ialpowersupply2052

0

,

ists277l

US

8-60

TEM,DEFINITION67


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RELISTS

G

MENT

SSION,M3

SSION,T8E3

unit

ting

ment

RIPTION

ONOUS

y

thitrust.org/access_

use#pd-google

Documents

Tm 9-1651 Data Transmission System m3, january 1942