Mosherflo ST Series User manual

JULY1,2010
ST‐SERIESI.O.M.
Installation,Operation,and
MaintenanceManual
WITHPARTSLIST
PUMPS
STSERIESPUMP
Mosherflo Pumps, LLC.
5902A FM 517 RD. E.
SAN LEON, TX 77539
281-800-PUMP (7867)

TABLEOFCONTENTS
INTRODUCTION………………………………………….PAGE3
SAFETY–SECTIONA…………………………………..PAGE4
INSTALLATION–SECTIONB……………………….PAGE5‐9
PumpDimensions……….PAGE5
PREINSTALLATIONINSPECTION…….PAGE5
POSITIONINGPUMP…………………….PAGE5‐6
Lifting…………………………..5
Mounting……………………..5‐6
Clearance……………………..6
SUCTION&DISCHARGEPIPING……PAGE6
Materials……………………..6
LineConfiguration………..6
ConnectionstoPump…..6
Gauges…………………………6
SUCTIONLINES…………………………….PAGE6‐7
Fittings…………………………6
Strainers……………………....6
Sealing………………………….6
SuctionLinesinSumps…..6‐7
SuctionLinePositioning..7
DISCHARGELINES…………………………PAGE7‐8
Siphoning……………………..7
Valves…………………………..7
BypassLines………………..7‐8
ALIGNMENT………………………………..PAGE8‐9
CoupledDrives…………….8‐9
V‐BeltDrives………………..9
OPERATION–SECTIONC…………………………PG.10‐12
PRIMING…………………………………….PAGE10
STARTING…………………………………..PAGE10
Rotation……………………..10
OPERATION………………………………..PG.10‐12
LinesWithaBypass…….10
LinesWithoutaBypass.11
Leakage………………………11
LiquidTemperature&
Overheating………………..11
StrainerCheck………………11
PumpVacuumCheck……11‐12
STOPPING…………………………………….PAGE12
ColdWeatherPreservation12
BEARINGTEMPERATURECHECK…...PAGE12
TROUBLESHOOTING–SECTIOND………………….PG.13‐14
PUMPMAINTENANCE&REPAIR–SECTIONE…PG.15‐22
PUMPANDSEALDISASSEMBLY&
REASSEMBLY…………………………………...PG.15‐21
BackCover&WearPlate
Removal…………………………..15
SuctionCheckValve
Removal…………………………..15‐16
RotatingAssyRemoval…….16
ImpellerRemoval……………..16
SealRemoval…………………….16
Shaft&BearingRemoval
&Disassembly……………………16‐17
Shaft&BearingReassembly
&Installation……………………..17‐18
SealInstallation………………….18
ImpellerInstallation…………..20
RotatingAssyInstallation…..20
SuctionCheckValve
Installation…………………………20‐21
BackCoverInstallation………21
FINALPUMPASSEMBLY……………………PAGE21
LUBRICATION…………………………………..PG.21‐22
SealAssembly………………….21
Bearings…………………………..21‐22
PowerSource…………………..22
FIGURES–SECTIONF…………………………………….PG.23‐26
Page|2


INTRODUCTION
ThisInstallation,Operation,andMaintenancemanualis
designedtohelpyouachievethebestperformanceand
longestlifefromyourMosherflopump.
ThispumpisaTseries,semi‐openimpeller,self‐priming,
centrifugalmodelwithasuctioncheckvalve.Thepumpis
designedforhandlingmildindustrialcorrosives,residues,
andslurriescontaininglargeentrainedsolids.Thebasic
materialofconstructionisgrayiron,withductileiron
impellerandsteelwearingparts.
Ifthereareanyquestionsregardingthepumporits
applicationwhicharenotcoveredinthismanualorin
otherliteratureaccompanyingthisunit,pleasecontact
yourMosherflodistributor,orcontactR.B.MosherCo.,
Inc.at(281)339‐3382.
Forinformationortechnicalassistanceonthepower
source,contactthepowersourcemanufacturer’slocal
dealerorrepresentative.
Thefollowingareusedtoalertmaintenancepersonnelto
procedureswhichrequirespecialattention,tothosewhich
coulddamageequipment,andtothosewhichcouldbe
dangeroustopersonnel:

ImmediatehazardswhichWILLresultinseverepersonal
injuryordeath.Theseinstructionsdescribethe
procedurerequiredandtheinjurywhichwillresultfrom
failuretofollowtheprocedure.

HazardsorunsafepracticeswhichCOULDresultinsevere
personalinjuryordeath.Theseinstructionsdescribethe
procedurerequiredandtheinjurywhichwillresultfrom
failuretofollowtheprocedure.

NOTE:
Instructionstoaidininstallation,operation,and
maintenanceorwhichclarifyaprocedure.























Page|3


SAFETY–SECTIONA
ThesewarningapplytoTSeriesbasicpumps.R.B.
MosherCo.,Inc.hasnocontroloverorparticular
knowledgeofthepowersourcewhichwillbeused.Refer
tothemanualaccompanyingthepowersourcebefore
attemptingtobeginoperation.

Beforeattemptingtoopenorservicethepump:
1. Familiarizeyourselfwiththismanual.
2. Disconnectorlockoutthepowersourceto
ensurethatthepumpwillremaininoperative.
3. Allowthepumptocoolifoverheated.
4. Checkthetemperaturebeforeopeningany
covers,plates,orplugs.
5. Closethesuctionanddischargevalves.
6. Ventthepumpslowlyandcautiously.
7. Drainthepump.

Thispumpisdesignedtohandlemildindustrial
corrosives,residues,andslurriescontaininglarge
entrainedsolids.Donotattempttopumpvolatile,
corrosive,orflammablematerialswhichmaydamagethe
pumporendangerpersonnelasaresultofpumpfailure.


Afterthepumphasbeenpositioned,makecertainthat
thepumpandallpipingconnectionsaretight,properly
supportedandsecurebeforeoperation.


Donooperatethepumpwithouttheguardsinplaceover
therotatingparts.Exposedrotatingpartscancatch
clothing,fingers,ortools,causingsevereinjuryto
personnel.

Donotremoveplates,covers,gauges,pipeplugs,or
fittingfromanoverheatedpump.Vaporpressurewithin
thepumpcancausepartsbeingdisengagedtobeejected
withgreatforce.Allowthepumptocoolbefore
servicing.

Donotoperatethepumpagainstcloseddischargevalve
forlongperiodsoftime.Ifpumpoperatedagainsta
closeddischargevalve,pumpcomponentswill
deteriorate,andtheliquidcouldcometoaboil,build
pressure,andcausethepumpcasingtoruptureor
explode.


Usetheliftingandmovingequipmentingoodrepairand
withadequatecapacitytopreventinjuriestopersonnel
ordamagetoequipment.Suctionanddischargehoses
andpipingmustberemovedfromthepumpbefore
lifting.



Page|4


INSTALLATION–SECTIONB
ReviewallSAFETYInformationinSectionA.
Sincepumpinstallationsareseldomidentical,thissection
offersonlygeneralrecommendationsandpractices
requiredtoinspect,position,andarrangethepumpand
piping.
Mostoftheinformationpertainstoastandardstaticlift
applicationwherethepumpispositionedabovethefree
levelofliquidtobepumped.
Ifinstalledinafloodedsuctionapplicationwherethe
liquidissuppliedtothepumpunderpressure,someofthe
informationsuchasmounting,lineconfiguration,and
primingmustbetailoredtothespecificapplication.Since
thepressuresuppliedtothepumpiscriticalto
performanceandsafety,besuretolimittheincoming
pressureto50%ofthemaximumpermissibleoperating
pressureasshownonthepumpperformancecurve.
Forfurtherassistance,contactyourMosherflodistributor
ortheR.B.MosherCo.,Inc.
PumpDimensions
SeeFigure1fortheapproximatephysicaldimensionsof
thispump.
PREINSTALLATIONINSPECTION
Thepumpassemblywasinspectedandtestedbefore
shipmentfromthefactory.Beforeinstallation,inspectthe
pumpfordamagewhichmayhaveoccurredduring
shipment.Checkasfollows:
a. Inspectthepumpforcracks,dents,damaged
threads,andotherobviousdamage.
b. Checkforandtightenattachinghardware.Since
gasketstendtoshrinkafterdrying.Checkfor
loosehardwareatmatingsurfaces.
c. Carefullyreadallwarningsandcautions
containedinthismanualoraffixedtothepump,
andperformalldutiesindicated.Notethe
directionofrotationindicatedonthepump.
Checkthatthepumpshaftrotates
counterclockwisewhenfacingtheimpeller.


Onlyoperatethispumpinthedirectionindicatedbythe
arrowonthepumpbodyandontheaccompanyingdecal.
RefertoROTATIONinOPERATION,SectionC.
d. Checklevelsandlubricateasnecessary.Referto
LUBRICATIONintheMAINTENANCEAND
REPAIRsectionofthismanualandperform
dutiesasinstructed.
e. Ifthepumpandpowersourcehavebeenstored
formorethan12months,someofthe
componentsorlubricantsmayhaveexceeded
theirmaximumshelflife.Thesemustbe
inspectedorreplacedtoensuremaximumpump
service.
Ifthemaximumshelflifehasbeenexceeded,orifanything
appearstobeabnormal,contactyourMosherflo
distributororR.B.MosherCo.,Inc.todeterminerepairor
updatingpolicy.Donotputthepumpintoserviceuntil
appropriateactionhasbeentaken.
POSITIONINGPUMP
Lifting
Usetheliftingequipmentwithacapacityofatleast2,000
lbs.(907.2kg).Thispumpweightsapproximately400lbs.
(181.4kg),notincludingtheweightofaccessoriesand
base.Customerinstalledequipmentsuchassuctionand
dischargepipingmustberemovedbeforeattemptingto
lift.

Thepumpassemblycanbeseriouslydamagedifthecable
orchainsusedtoliftandmovetheunitareimproperly
wrappedaroundthepump.
Mounting
Locatethepumpinanaccessibleplaceascloseaspractical
totheliquidbeingpumped.Levelmountingisessentialfor
properoperation.
Page|5


Thepumpmayhavetobesupportedorshimmedto
provideforleveloperationortoeliminatevibration.
Clearance
Whenpositioningpump,allowaminimumclearanceof18
inches(457mm)infrontofthebackcovertopermit
removalofthecoverandeasyaccesstothepumpinterior.
SUCTIONANDDISCHARGEPIPING
Pumpperformanceisadverselyaffectedbyincreased
suctionlift,dischargeelevation,andfrictionlosses.See
theperformancecurveandoperatingrange.
Materials
Eitherpipeorhosemaybeusedforsuctionanddischarge
lines;however,thematerialsmustbecompatiblewiththe
liquidbeingpumped.Ifhoseisusedinsuctionlines,it
mustbetherigid‐wall,reinforcedtypetopreventcollapse
undersuction.Usingpipingcouplingsinsuctionisnot
recommended.
LineConfiguration
Keepsuctionanddischargelinesasstraightaspossibleto
minimizefrictionlosses.Makeminimumuseofelbows
andfittings,whichsubstantiallyincreasefrictionloss.If
elbowsarenecessary,usethelong‐radiustypetominimize
frictionloss.
ConnectionstoPump
Beforetighteningaconnectingflange,alignitexactlywith
thepumpport.Neverpullapipelineintoplaceby
tighteningtheflangeboltsand/orcouplings.
Linesnearthepumpmustbeindependentlysupportedto
avoidstrainonthepumpwhichcouldcauseexcessive
vibration,decreasedbearinglife,andincreasedshaftand
sealwear.Ifhose‐typelinesareused,theyshouldhave
adequatesupporttosecurethemwhenfilledwithliquid
andunderpressure.
Gauges
Mostpumpsaredrilledandtappedforinstallingdischarge
pressureandvacuumsuctiongauges.Ifthesegaugesare
desiredforpumpsthatarenottapped,drillandtapthe
suctionanddischargelinesnotlessthan18inches(457.2
mm)fromthesuctionandsicharg3eportsandinstallthe
lines.Installationclosertothepumpmayresultinerratic
readings.
SUCTIONLINES
Toavoidairpocketswhichcouldaffectpumppriming,the
suctionlinemustbeasshortanddirectaspossible.When
operationinvolvesasuctionlift,thelinemustalwaysslope
upwardtothepumpfromthesourceoftheliquidbeing
pumped;ifthelineslopesdowntothepumpatanypoint
alongthesuctionrun,airpocketswillbecreated.;
Fittings
Suctionlinesshouldbethesamesizeasthepumpinlet.If
reducersareusedinsuctionlines,theyshouldbethe
eccentrictype,andshouldbeinstalledwiththeflatpartof
thereducersuppermosttoavoidcreatingairpockets.
Valvesarenotnormallyusedinsuctionlines,butifavalve
isused,installitwiththestemhorizontaltoavoidair
pockets.
Strainers
Ifastrainerisfurnishedwiththepump,becertaintouse
it;anysphericalsolidswhichpassthroughastrainer
furnisehedwiththepumpwillallpassthroughthepump
itself.
Ifastrainerisnotfurnishedwiththepump,butisinstalled
bythepumpuser,makecertainthatthetotalareaofthe
openingsinthestrainerisatleastthreeorfourtimesthe
corsssectionofthesuctionline,andthattheopeningswill
notpermitpassageofsolidslargerthanthesolidshandling
capabilityofthepump.
Thispumpisdesignedtohandleupto2‐1/2inches
(63.5mm)diametersphericalsolids.
Sealing
Sinceevenaslightleakwillaffectpriming,headand
capacity,especiallywhenoperatingwithahighsuctionlift,
allconnectionsinthesuctionlineshouldbesealedwith
pipedopetoensureanairtightseal.Followthesealant
manufacturer’srecommendationswhenselectingand
applyingthepipedope.Thepipedopeshouldbe
compatiblewiththeliquidbeingpumped.
SuctionLinesinSumps
Ifasinglesuctionlineisinstalledinasump,itshouldbe
positionedawayfromthewallofthesumpatadistance
equalto1‐1/2timesthediameterofthesuctionline.
Page|6


Ifthereisaliquidflowfromanopenpipeintothesump,
theflowshouldbekeptawayfromthesuctioninlet
becausetheinflowwillcarryairdownintothesump,and
airenteringthesuctionlinewillreducepumpefficiency.
Ifitisnecessarytopositioninflowclosetothesuction
inlet,installabafflebetweentheinflowandthesuction
inletatadistanceof1‐1/2timesthediameterofthe
suctionpipe.Thebafflewillallowentrainedairtoescape
fromtheliquidbeforeitisdrawnintothesuctioninlet.
Iftwosuctionlinesareinstalledinasinglesump,theflow
pathsmayinteract,reducingtheefficiencyofoneorboth
pumps.Toavoidthis,positionthesuctioninletssothat
theyaresparatedbyadistanceequaltoaleast3timesthe
diameterofthesuctionpipe.
SuctionLinePositioning
Thedepthofthesubmergenceofthesuctionlineiscritical
toefficientpumpoperation.Figure2shows
recommendedminimumsubmergencevs.velocity.
NOTE
Thepipesubmergencerequiredmaybereducedby
installingastandardpipeincreaserfittingattheendofthe
suctionline.Thelargeropeningsizewillreducetheinlet
velocity.Calculatetherequiredsubmergenceusingthe
followingformulabasedontheincreasedopeningsize
(areaordiameter).SeeFigure2.
DISCHARGELINES
Siphoning
Donotterminatethedischargelineatalevellowerthan
thatoftheliquidbeingpumpedunlessasiphonbreakeris
usedintheline.Otherwise,asiphoningactioncausing
damagetothepumpcouldresult.
Valves
Ifathrottlingvalveisdesiredinthedischargeline,usea
valveaslargeasthelargestpipetominimizefriction
losses.Neverinstallathrottlingvalveinasuctionline.
Withhighdischargeheads,itisrecommendedthata
throttlingvalveandasystemcheckvalvebeinstalledin
thedischargelinetoprotectthepumpfromexcessive
shockpressureandreverserotationwhenitisstopped.


Iftheapplicationinvolvesahighdischargehead,gradually
closethedischargethrottlingvalvebeforestoppingthe
pump.
BypassLines
Self‐primingpumpsarenotaircompressors.Duringthe
primingcycle,airfromthesuctionlinemustbeventedto
atmosphereonthedischargeside.Ifthedischargelineis
open,thisairwillbeventedthroughthedischarge.
However,ifacheckvalvehasbeeninstalledinthe
dischargeline,thedischargesideofthepumpmustbe
openedtoatmosphericpressurethroughabypassline
installedbetweenthepumpdischargeandthecheck
valve.Aself‐primingcentrifugalpumpwillnotprimeif
thereissufficientstaticliquidheadtoholdthedischarge
checkvalveclosed.
NOTE
Thebypasslineshouldbesizedsothatitdoesnotaffect
pumpdischargecapacity;however,thebypasslineshould
beatleast1inch(25.4mm)indiametertominimizethe
chanceofplugging.
Inlowdischargeheadapplications(lessthan30ft.or9
meters),itisrecommendedthatthebypasslineberun
backtothewetwell,andlocated6inchesbelowthewater
levelorcut‐offpointofthelowlevelpump.Insome
installations,thisbypasslinemaybeterminatedwithasix‐
to‐eightfootlengthof1‐1/4inchI.D.smooth‐borehose;
airandliquidventedduringtheprimingprocesswillthen
agitatethehoseandbreakupanysolids,grease,orother
substanceslikelytocauseclogging.

Abypasslinethatisreturnedtoawetwellmustbe
securedagainstbeingdrawnintothepumpsuctioninlet.
Itisalsorecommendedthatpipeunionsbeinstalledat
each90degreeelbowinabypasslinetoeasedisassembly
andmaintenance.
Page|7


Inhighdischargeheadapplications(morethan30feet),
anexcessiveamountofliquidmaybebypassedandforced
backtothewetwellunderthefullworkingpressureofthe
pump;thiswillreduce.Thereforeitisrecommendedthat
anautomaticairreleasevalvebeinstalledinthebypass
line.
Iftheinstallationinvolvesafloodedsuctionsuchasa
below‐groundliftstation,apipeunionandmanualshut‐
offvalvemaybeinstalledinthebleedlinetoallowservice
ofthevalvewithoutshuttingdownthestation,andto
eliminatethepossibilityofflooding.Ifamunualshut‐off
valveisinstalledanywhereintheairreleasepiping,it
mustbeafull‐openingballtypevalvetopreventplugging
bysolids.

Ifmanualshut‐offvalveisinstalledinabypassline,it
mustnotbeleftclosedduringoperation.Aclosed
manualshut‐offvalvemaycauseapumpwhichhaslost
primetocontinuetooperatewithoutreachingprime,
causingdangerousoverheatingandpossibleexplosive
ruptureofthepumpcasing.Personnelcouldbeseverely
injured.
Allowanover‐heatedpumptocoolbeforeservicing.Do
notremoveplates,covers,gauges,orfittingsfroman
overheatedpump.Liquidwithinthepumpcanreach
boilingtemperatures,andvaporpressurewithinthe
pumpcancausepartsbeingdisengagedtobeejected
withgreatforce.Afterthepumpcools,draintheliquid
fromthepumpbyremovingcasingdrainplug.Use
cautionwhenremovingtheplugtopreventinjuryto
personnelfromhotliquid.
ALIGNMENT
Thealignmentofthepumpanditspowersourceiscritical
fortrouble‐freemechanicaloperation.Inaeitheraflexible
couplingorV‐beltdrivensystem,thedriverandpump
mustbemountedsothattheirshaftsarealignedwithand
paralleltoeachother.Itisimperativethatalignmentbe
checkedafterthepumpandpipingareinstalled,and
beforeoperation.


NOTE
CheckRotation,SectionC,beforefinalalignmentofthe
pump.
WhenmountedattheR.B.MosherCo.,Inc.factory,driver
andpumparealignedbeforeshipmen.Misalignmentwill
occurintransitandhandling.Pumpsmustbecheckedand
realignedbeforeoperation.Beforecheckingalignment,
tightenthefoundationbolts.Thepumpcasingfeetand
/orpedestalfeet,andthedrivermountingboltsshould
alsobetightlysecured.

Whencheckingalignment,disconnectthepowersource
toensurethatthepumpwillremaininoperative.

Adjustingthealignmentinonedirectionmayalterthe
alignmentinanotherdirection.Checkeachprocedure
afteralteringalignment.
CoupledDevices
Whenusingcouplings,theaxisofthepowersourcemust
bealignedtotheaxisofthepumpshaftinboththe
horizontalandverticalplanes.Mostcouplingsrequirea
specificgaporclearancebetweenthedrvingandthe
drivenshafts.Refertothecouplingmanufacturer’s
serviceliterature.
Alignspiderinserttypecouplingsbyusingcalipersto
measurethedimensionsonthecircumferenceofthe
outerendsofthecouplinghubevery90degrees.The
couplingisinalignmentwhenthehubendsarethesame
distanceapartatallpoints(seeFigure3A).
Alignnon‐spidertypecouplingsbyusingafeelergaugeor
tapergaugebetweenthecouplinghalvesevery90
degrees.Thecouplingisinalignmentwhenthehubsare
thesamedistanceapartatallpoints(seeFigure3B).
Checkparalleladjustmentbylayingastraightedgeacross
bothcouplingrimsatthetop,bottom,andside.Whenthe
Page|8


straightedgerestsevenlyonbothhalvesofthecoupling,
thecouplingisinhorizontalparallelalignment.Ifthe
couplingismisaligned,useafeelergaugebetweenthe
couplingandthestraightedgetomeasuretomeasurethe
amountofmisalignment.
V‐BeltDrives
WhenusingV‐beltdrives,thepowersourceandthepump
mustbeparallel.Useastraightedgealongthesidesofthe
pulleystoensurethatthepulleysareproperlyaligned(see
Figure3C).Indrivesystemsusingtwoormorebelts,make
certainthatthebeltsareamatchedset;unmatchedsets
willcauseacceleratedbeltwear.
Tightenthebeltsinaccordancewiththebelt
manufacturer’sinstructions.Ifthebeltsaretooloose,
theywillslip;ifthebeltsaretootight,therewillbe
excessivepowerlossandpossiblebearingfailure.Select
pulleysthatwillmatchtheproperspeedration;over‐
speedingthepumpmaydamagebothpumpandpower
source.

Donotoperatethepumpwithouttheguardinplaceover
therotatingparts.Exposedrotatingpartscancatch
clothing,fingers,ortools,causingsevereinjuryto
personnel.








































Page|9


OPERATION–SECTIONC
ReviewallSAFETYinformationinSectionA.
Followtheinstructionsonalltags,labels,anddecals
attachedtothepump.

Thispumpisdesignedtohandlemildindustrial
corrosives,residues,andslurriescontaininglarge
entrainedsolids.Donoattempttopumpvolatile,
corrosive,orflammableliquidswhichmaydamagethe
pumporendangerpersonnelasaresultofpumpfailure.

Pumpspeedandoperatingconditionsmustbewithinthe
performancerangeshownonpageE‐1.
PRIMING
InstallthepumpandpipingasdescribedinINSTALLATION.
Makesurethatthepipingconnectionsaretight,andthat
thepumpissecurelymounted.Checkthatthepumpis
properlylubricated(seeLUBRIICATIONinMAINTENANCE
ANDREPAIR).
Thispumpisself‐priming,butthepumpshouldneverbe
operatedunlessthereisliquidinthepumpcasing.

Neveroperatethispumpunlessthereisliquidinthepump
casing.Thepumpwillnotprimewhendry.Extended
operationofadrypumpwilldestroythesealassembly.
Addliquidtothepumpcasingwhen:
1. Thepumpisbeingputintoserviceforthefirst
time.
2. Thepumphasbeenusedforalengthoftime.
3. Theliquidinthepumpcasinghasevaporated.
Oncethepumpcasinghasbeenfilled,thepumpwillprime
andreprimeasnecessary.

Afterfillingthepumpcasing,reinstallandtightenthefill
plug.Donotattempttooperatethepumpunlessall
connectingpipingissecurelyinstalled.Otherwise,liquid
inthepumpforcedoutunderpressurecouldcauseinjury
topersonnel.
Tofillthepump,removethepumpcasingfillcoverorfill
pluginthetopofthecasing,andaddcleanliquiduntilthe
casingisfilled.Replacethefillcoverorfillplugbefore
operatingthepump.
STARTING
Consulttheoperationsmanualfurnishedwiththepower
source.
Rotation
Thecorrectdirectionofpumprotationiscounterclockwise
whenfacingtheimpeller.Thepumpcouldbedamaged
andperformanceadverselyaffectedbyincorrectrotation.
Ifpumpperformanceisnotwithinthespecifiedlimits,
checkthedirectionofpowersourcerotationbefore
furthertroubleshooting.
Ifanelectricmotorisusedtodrivethepump,removeV‐
belts,couplings,orotherwisedisconnectthepumpfrom
themotorbeforecheckingmotorrotation.Operatethe
motorindependentlywhileobservingthedirectionofthe
motorshaft,orcoolingfan.
Ifrotationisincorrectonathree‐phasemotor,havea
qualifiedelectricianinterchangeanytwoofthethree
phasewirestochangedirection.Ifrotationisincorrecton
asingle‐phasemotor,consulttheliteraturesuppliedwith
themotorforspecificinstructions.
OPERATION
LinesWithaBypass
Ifanautomaticairreleasevalvehasbeeninstalled,the
valvewillautomaticallyopentoallowthepumptoprime,
andautomaticallycloseafterprimingiscomplete.
Page|10


Ifthebypasslineisopen,airfromthesuctionlinewillbe
dischargedthroughthebypasslinebacktothewetwell
duringtheprimingcycle.Liquidwillthencontinueto
circulatethroughthebypasslinewhilethepumpisin
operation.
LinesWithoutaBypass
Openallvalvesinthedischargelineandstartthepower
source.Primingisindicatedbyapositivereadingonthe
dischargepressuregaugeorbyaquieteroperation.The
pumpmaynotprimeimmediatelybecausethesuctionline
mustfirstfillwithliquid.Ifthepumpfailstoprimewithin
fiveminutes,stopitandcheckthesuctionlineforleaks.
Afterthepumphasbeenprimed,partiallyclosethe
dischargelinethrottlingvalveinordertofillthelineslowly
andguardagainstexcessiveshockpressurewhichcould
damagepipeends,gaskets,sprinklerheads,andanyother
fixturesconnectedtotheline.Whenthedischargelineis
completelyfilled,adjustthethrottlingvalvetothe
requiredflowrate.

Donooperatethepumpagainstacloseddischarge
throttlingvalveforlongperiodsoftime.Ifoperated
againstacloseddischargethrottlingvalve,pump
componentswilldeteriorate,andtheliquidcouldcome
toaboil,buildpressure,andcausethepumpcasingto
ruptureorexplode.
Leakage
Noleakageshouldbevisibleatpumpmatingsurfaces,or
atpumpconnectionsorfittings.Keepalllineconnections
andfittingstighttomaintainmaximumpumpefficiency.
LiquidTemperatureandOverheating
Themaximumliquidtemperatureforthispumpis160
degreesF(71degreesC).Donotapplyitatahigher
operatingtemperature.
Overheatingcanoccurifoperatedwiththevalvesinthe
suctionordischargelinesclosed.Operatingagainstclosed
valvescouldbringtheliquidtoaboil,buildpressure,and
causethepumptoruptureorexplode.Ifoverheating
occurs,stopthepumpandallowittocoolbeforeservicing
it.Refillthepumpcasingwithcoolliquid.

Allowanover‐heatedpumptocoolbeforeservicing.Do
notremoveplates,covers,gauges,orfittingsfroman
overheatedpump.Liquidwithinthepumpcanreach
boilingtemperatures,andvaporpressurewithinthe
pumpcancausepartsbeingdisengagedtobeejected
withgreatforce.Afterthepumpcools,draintheliquid
fromthepumpbyremovingthecasingdrainplug.Use
cautionwhenremovingtheplugtopreventinjuryto
personnelfromhotliquid.
Asasafeguardagainstruptureorexplosionduetoheat,
thispumpisequippedwithapressurereliefvalvewhich
willopenifvaporpressurewithininthepumpcasing
reachesacriticalpoint.Ifoverheatingdoesoccur,stop
thepumpimmediatelyandallowittocoolbeforeservicing
it.Approachanyoverheatedpumpcautiously.Itis
recommendedthatthepressurereliefvalveassemblybe
replacedateachoverhaul,oranytimethepumpcasing
overheatsandactivatesthevalve.Neverreplacethisvalve
withasubstitutewhichhasnotbeenspecifiedorprovided
byR.B.MosherCo.
StrainerCheck
Ifasuctionstrainerhasbeenshippedwiththepumpor
installedbytheuser,checkthestrainerregularly,and
cleanitasnecessary.Thestrainershouldalsobechecked
ifpumpflowratebeginstodrop.Ifavacuumsuction
gaugehasbeeninstalled,monitorandrecordthereadings
regularlytodetectstrainerblockage.
Neverintroduceairorsteampressureintothepump
casingorpipingtoremoveablockage.Thiscouldresultin
personalinjuryordamagetotheequipment.Ifback
flushingisabsolutelynecessary,liquidpressuremustbe
limitedto50%ofthemaximumpermissibleoperating
pressureshownonthepumpperformancecurve.
PumpVacuumCheck
Withthepumpinoperative,installavacuumgaugeinthe
system,usingpipedopeonthethreads.Blockthesuction
lineandstartthepump.Atoperatingspeed,thepump
shouldpullavacuumof20inches(508.0mm)ormoreof
mercury.Ifitdoesnot,checkforairleaksintheseal,
gasket,ordischargevalve.
Page|11


Openthesuctionline,andreadthevacuumgaugewith
thepumpprimedandatoperationspeed.Shutoffthe
pump.Thevacuumgaugereadingwillimmediatelydrop
proportionatetostaticsuctionlift,andshouldthen
stabilize.Ifthevacuumgaugereadingfallsoffrapidlyafter
stabilization,anairleakexists.Beforecheckingforthe
sourceoftheleak,checkthepointofinstallationofthe
vacuumgauge.
STOPPING
Neverhalttheflowofliquidsuddenly.Iftheliquidbeing
pumpedisstoppedabruptly,damagingshockwavescanbe
transmittedtothepumpandpipingsystem.Closeall
connectingvalvesslowly.
Onenginedrivenpumps,reducethethrottlespeedslowly
andallowtheenginetoidlebrieflybeforestopping.

Iftheapplicationinvolveshighdischargehead,gradually
closethedischargethrottlingvalvebeforestoppingthe
pump.
Afterstoppingthepump,lockoutordisconnectthepower
sourcetoensurethatthepumpwillremaininoperative.
ColdWeatherPreservation
Inbelowfreezingconditions,drainthepumptoprevent
damagefromfreezing.Also,cleanoutanysolidsby
flushingwithahose.Operatethepumpforapproximately
oneminute;thiswillremoveanyremainingliquidthat
couldfreezethepumprotatingparts.Ifthepumpwillbe
idleformorethanafewhours,orifithasbeenpumping
liquidscontainingalargeamountofsolids,drainthe
pump,andflushitthoroughlywithcleanwater.To
preventlargesolidsfromcloggingthedrainportand
preventingthepumpfromcompletelydraining,inserta
rodorstuffwireintheport,andagitatetheliquidduring
thedrainingprocess.Cleanoutanyremainingsolidsby
flushingwithahose.
BEARINGTEMPERATURECHECK
Bearingsnormallyrunathigherthanambient
temperaturesbecauseofheatgeneratedbyfriction.
Temperaturesupto160degreesF(71degreesC)are
considerednormalforbearings,andtheycanoperate
safelytoatleast180degreesF(82degreesC).
Checkingbearingtemperaturesbyhandisinaccurate.
Bearingtemperaturescanbemeasuredaccuratelyby
placingacontact‐typethermometeragainstthehousing.
Recordthistemperatureforfuturereference.
Asuddenincreaseinbearingtemperatureisawarning
thatthebearingsareatthepointoffailingtooperate
properly.Makecertainthatthebearinglubricantisofthe
properviscosityandatthecorrectlevel(seeLUBRICATION
inMAINTENANCEANDREPAIR).Bearingoverheatingcan
alsobecausedbyshaftmisalignmentand/orexcessive
vibration.
Whenpumpsarefirststarted,thebearingsmayseemto
runattemperaturesabovenormal.Continuedoperation
shouldbringthetemperaturesdowntonormallevels.


















Page|12



TROUBLESHOOTING–SECTIOND
ReviewallSAFETYInformationinsectionA.

Beforeattemptingtoopenorservicethepump:
1. Familiarizeyourselfwiththismanual.
2. Lockoutordisconnectthepowersourceto
ensurethatthepumpwillremaininoperative.
3. Allowthepumptocoolifoverheated.
4. Checkthetemperaturebeforeopeningany
covers,plates,orplugs.
5. Closethesuctionanddischargevalves.
6. Ventthepumpslowlyandcautiously.
7. Drainthepump.














TROUBLE POSSIBLE
CAUSE
PROBABLE
REMEDY
PUMPFAILSTO
PRIME
Notenough
liquidincasing.


Suctioncheck
valve
contaminatedor
damaged.

Airleakinsuction
line.

Liningofsuction
hosecollapsed.

Leakingorworn
sealorpump
gasket.


Suctionliftor
dischargehead
toohigh.



Strainerclogged
Addliquidto
casing.See
PRIMING.

Cleanorreplace
checkvalve.



Correctleak.


Replacesuction
hose.

Checkpump
vacuum.Replace
leakingorworn
sealorgasket.

Checkpiping
installationand
installbypassline
ifneeded.See
INSTALLATION.

Checkstrainer
andcleanif
necessary.

PUMPSTOPSOR
FAILSTO
DELIVERRATED
FLOWOR
PRESSURE
Airleakinsuction
line.

Liningofsuction
hosecollapsed.

Leakingorworn
sealorpump
gasket.


Strainerclogged.



Suctionintake
notsubmerged
atproperlevelor
sumptoosmall.

Impellerclogged.


Pumpspeedtoo
slow.

Correctleak.


Replacesuction
hose.

Checkpump
vacuum.Replace
leakingorworn
sealorgasket.

Checkstrainer
andcleanif
necessary.

Checkinstallation
andcorrect
submergenceas
needed.

Freeimpellerof
debris.

Checkdriver
output;check
beltsorcouplings
Page|13




Dischargehead
toohigh.

Suctionlifttoo
high.
forslippage.

Installbypass
line.

Measurelift
w/vacuum
gauge.Reduce
liftand/or
frictionlossesin
suctionline.s
PUMPREQUIRES
TOOMUCH
POWER
Pumpspeedtoo
high.




Dischargehead
toolow.

Liquidsolution
toothick.

Bearing(s)frozen.

Checkdriver
output;check
thatsheavesor
couplingsare
correctlysized.

Adjustdischarge
valve.

Diluteifpossible.


Disassemble
pumpandcheck
bearing(s).
EXCESSIVENOISECavitationin
pump.









Pumping
entrainedair.


Pumpordrive
notsecurely
mounted.

Impellerclogged
ordamaged.
Reducesuction
liftand/or
frictionlossesin
suctionline.
Recordvacuum
andpressure
gaugereading
andconsult
Mosherflo
Representative.

Locateand
eliminatesource
ofairbubble.

Securemounting
hardware.


Cleanoutdebris;
replacedamaged
parts.
PUMPCLOGS
FREQUENTLY
Liquidsolution
toothick.

Dischargeflow
tooslow.





Diluteifpossible.


Opendischarge
valvefullyto
increaseflow
rate,andrun
powersourceat
maximum
governedspeed.

Suctioncheck
valveorfoot
valvecloggedor
binding.

Cleanvalve.
BEARINGSRUN
TOOHOT
Bearing
temperatureis
high,butwithin
limits.


Loworincorrect
lubricant.


Suctionand
dischargelines
notproperly
supported.

Drivemisaligned.

Checkbearing
temperature
regularlyto
monitorany
increase.

Checkforproper
typeandlevelof
lubricant.

Checkpiping
installationfor
propersupport.


Aligndrive
properly.


















Page|14


PUMPMAINTENANCEANDREPAIR–SECTIONE
MAINTENANCEANDREPAIROFTHEWEARINGPARTSOF
THEPUMPWILLMAINTAINPEAKOPERATING
PERFORMANCE.
PleaserefertothePERFORMANCEPUMPCURVEavailable
byrequestfromyourMosherfloRepresentative.


Pumpspeedandoperatingconditionpointsmustbe
withinthecontinuousperformancerangeshownonthe
curve.
PUMPANDSEALDISASSEMBLYANDREASSEMBLY
ReviewallSAFETYinformationinSectionA.
Followtheinstructionsonalltags,label,anddecals
attachedtothepump.
Thispumprequireslittleserviceduetoitsrugged,
minimum‐maintenancedesign.However,ifitbecomes
necessarytoinspectorreplacethewearingparts,follow
theseinstructionswhicharekeyedtothesectionalviews
(seeFigures4aand5a)andtheiraccompanyingparts’lists
(Figures4band5b).
Manyservicingfunctionsmaybeperformedbydraining
thepumpandremovingthebackcoverassembly.Ifmajor
repairisrequired,thepipingand/orpowersourcemustbe
disconnected.Thefollowinginstructionsassumecomplete
disassemblyisrequired.
Beforeattemptingtoservicethepump,disconnectorlock
outthepowersourceandtakeprecautionstoensurethat
itwillremaininoperative.Closeallvalvesinthesuction
anddischargelines.
Forpowersourcedisassemblyandrepair,consultthe
literaturesuppliedwiththepowersource,orcontactyour
localpowersourcerepresentative.


Beforeattemptingtoopenorservicethepump:
1. Familiarizeyourselfwiththismanual.
2. Disconnectorlockoutthepowersourceto
ensurethatthepumpwillremaininoperative.
3. Allowthepumptocoolifoverheated.
4. Checkthetemperaturebeforeopeningany
covers,plates,orplugs.
5. Closethesuctionanddischargevalves.
6. Ventthepumpslowlyandcautiously.
7. Drainthepump.

Useliftingandmovingequipmentingoodrepairand
withadequatecapacitytopreventinjuriestopersonnel
ordamagetoequipment.
BackCoverandWearPlateRemoval
(Figure4aand4b)
Thewearplate(16)iseasilyaccessibleandmaybe
servicedbyremovingthebackcoverassembly(23).Before
attemptingtoservicethepump,removethepumpcasing
drainplug(17)anddrainthepump.Cleanandreinstall
thedrainplug.
Removethehandnuts(21)andpullthebackcoverand
assembledwearplatefromthepumpcasing(1).Inspect
thewearplate,andreplaceitifbadlyscoredorworn.To
removethewearplate,disengagethehardware(19and
20).
InspectthebackcoverO‐ring(18)andreplaceitif
damagedorworn.
SuctionCheckValveRemoval
(Figure4aand4b)
Ifthecheckvalveassembly(33)istobeservice,remove
thecheckvalvepin(34),reachthroughthebackcover
Page|15


openingandpullthecompleteassemblyfromthesuction
flange(3).
NOTE
Furtherdisassemblyofthecheckvalveisnotrequiredsince
itmustbereplacedasacompleteunit.Individualpartsare
notsoldseparately.
RotatingAssemblyRemoval
(Figure5aand5b)
Therotatingassemblymaybeservicedwithout
disconnectingthesuctionordischargepiping;however,
thepowersourcemustberemovedtoprovideclearance.
Theimpeller(1)shouldbeloosenedwhiletherotating
assemblyisstillsecuredtothepumpcasing.Before
looseningtheimpeller,removethesealcavitydrainplug
(26)anddraintheseallubricant.Thiswillpreventtheoil
inthesealcavityfromescapingwhentheimpelleris
loosened.Cleanandreinstallthesealcavitydrainplug.
Immobilizetheimpellerbywedgingablockofwood
betweenthevanesandthepumpcasing,andremovethe
impellercapscrewandwasher(22and23).
Installtheshaftkey(12).Installthelatedogonthedrive
endoftheshaft(11)withthe“V”notchpositionedover
theshaftkey.
Withtheimpellerrotationstillblocked,(seeFigure6)use
alongpieceofheavybarstocktopryagainstthearmof
thelathedoginacounterclockwisedirection(whenfacing
thedriveendoftheshaft).Usecautionnottodamagethe
shaftorkeyway.Whentheimpellerbreaksloose,remove
thelathedog,keyandwoodblock.
NOTE
Donotremovetheimpelleruntiltherotatingassemblyhas
beenremovedfromthepumpcasing.
Removethehardware(13and14)securingtherotation
assemblytothepumpcasing.Separatetherotating
assemblybypullingstraightawayfromthepumpcasing.
ImpellerRemoval
(Figure2)
Withtherotatingassemblyremovedfromthepump
casing,unscrewtheimpellerfromtheshaft.Usecaution
whenunscrewingtheimpeller,tensionontheshaft.Use
cautionwhenunscrewingtheimpeller;tensiononthe
shaftsealspringwillbereleasedastheimpelleris
removed.Inspecttheimpellerandreplaceifcrackedor
badlyworn.
Removetheimpelleradjustingshims(28);tieandtagthe
shims,ormeasureandrecordtheirthicknessforeaseof
reassembly.
SealRemoval
(Figure2)
Slidetheintegralshaftsleeveandrotatingportionofthe
sealofftheshaftasaunit.
Useapairofstiffwireswithhookedendstoremovethe
stationaryelementandseat.
Analternatemethodofremovingthestationaryseal
componentsistoremovethehardware(19and20).And
separatethesealplate(21)andgasket(2)fromthe
bearinghousing(5).Positionthesealplateonaflat
surfacewiththeimpellersidedown.Useawoodendowel
orothersuitabletooltopressonthebacksideofthe
stationaryseatuntiltheseat,O‐rings,andstationary
elementcanberemoved.
RemovetheshaftsleeveO‐ring(29).
Ifnofurtherdisassemblyisrequired,refertoSeal
Installation.
ShaftandBearingRemovalandDisassembly
(Figure5aand5b)
Whenthepumpisproperlyoperatedandmaintained,the
bearinghousingshouldnotrequiredisassembly.
Disassembletheshaftandbearingsonlywhenthereis
evidenceofwearordamage.

Shaftandbearingdisassemblyinthefieldisnot
recommended.Theseoperationsshouldbeperformed
onlyinaproperlyequippedshopbyqualifiedpersonnel.
Page|16


Removethebearinghousingdrainplug(25)anddrainthe
lubricant.Cleanandreinstallthedrainplug.
Disengagethehardware(15and16)andslidethebearing
cap(10)andoilseal(13)offtheshaft.Removethe
bearingcapgasket(17),andpressoilsealfromthebearing
cap.
Placeablockofwoodagainsttheimpellerendoftheshaft
andtaptheshaftandassembledbearings(2and9)from
thebearinghousing.
Afterremovingtheshaftandbearings,cleanandinspect
thebearingsinplaceasfollows.

Topreventdamageduringremovalfromtheshaft,itis
recommendedthatbearingsbecleanedandinspectedin
place.Itisstronglyrecommendedthatthebearingsbe
replacedanytimetheshaftandbearingsareremoved.
Cleanthebearinghousing,shaft,andallcomponentparts
(exceptthebearings)withasoftclothsoakedincleaning
solvent.Inspectthepartsforwearordamageandreplace
asnecessary.

Mostcleaningsolventsaretoxicandflammable.Use
themonlyinawell‐ventilatedareafreefromexcessive
hear,sparks,andflame.Readandfollowallprecautions
printedonsolventcontainers.
Cleanthebearingsthoroughlyinfreshcleaningsolvent.
Drythebearingswithfilteredcompressedairandcoat
withlightoil.

Bearingsmustbekeptfreeofalldirtandforeignmaterial.
Failuretodosowillgreatlyshortenbearinglife.DONOT
spindrybearings.Thismayscratchtheballsorracesand
causeprematurebearingfailure.
Rotatethebearingsbyhandtocheckforroughnessor
bindingandinspectthebearingballs.Ifrotationisrough
orthebearingballsarediscolored,replacethebearings.
Thebearingtolerancesprovideatightpressfitontothe
shaftandasnugslipfitintothebearinghousing.Replace
thebearings,shaft,orbearinghousingifproperbearingfit
isnotachieved.
Ifbearingreplacementisrequired,removetheoutboard
bearingretainingring(14),anduseabearingpullerto
removethebearingsfromtheshaft.
Presstheinboardoilseal(18)fromthebearinghousing.
ShaftandBearingReassemblyandInstallation
(Figure5aand5b)
Cleanthebearinghousing,shaft,andallcomponentparts
(exceptthebearings)withasoftclothsoakedincleaning
solvent.Inspectthepartsforwearordamageandreplace
asnecessary.

Mostcleaningsolventsaretoxicandflammable.Use
themonlyinawell‐ventilatedareafreefromexcessive
hear,sparks,andflame.Readandfollowallprecautions
printedonsolventcontainers.
Inspecttheshaftfordistortion,nicks,orscratches,orfor
threaddamageontheimpellerend.Dresssmallnicksand
burrswithafinefileoremerycloth.Replacetheshaftif
defective.
Positiontheinboardseal(18)inthebearinghousingbore
withthelippositionedasshowninFigure5a.Presstheoil
sealintothehousinguntilthefaceisjustflushwiththe
machinedsurfaceonthehousing.


Page|17



Topreventdamageduringremovalfromtheshaft,itis
recommendedthatbearingsbecleanedandinspectedin
place.Itisstronglyrecommendedthatthebearingsbe
replacedanytimetheshaftandbearingsareremoved.
NOTE
Positiontheinboardbearing(4)ontheshaftwiththe
shieldedsidetowardtheimpellerendoftheshaft.Position
theoutboardbearing(9)ontheshaftwiththeintegral
retainingringonthebearingO.D.towardthedriveendof
theshaft.
Thebearingsmaybeheatedtoeaseinstallation.An
inductionheater,hotoilbath,electricoven,orhotplate
maybeusedtoheatthebearings.Bearingsshouldnever
beheatedwithadirectflameordirectlyonahotplate.
NOTE
Ifahotoilbathisusedtoheatthebearings,boththeoil
andthecontainermustbeabsolutelyclean.Iftheoilhas
beenpreviouslyused,itmustbethoroughlyfiltered.
Heatthebearingstoauniformtemperature—nohigher
than250degreesF(120degreesC)—andslidethe
bearingsontotheshaft,oneatatime,untiltheyarefully
seated.Thisshouldbedonequickly,inonecontinuous
motion,topreventhebearingsfromcoolingandsticking
ontheshaft.
Afterthebearingshavebeeninstalledandallowedtocool,
checktoensurethattheyhavenotmovedawayfromthe
shaftshouldersinshrinking.Ifmovementhasoccurred,
useasuitablesizedsleeveandapresstorepositionthe
bearingsagainsttheshaftshoulders.
Ifheatingthebearingsisnotpractical,useasuitablesized
sleeve,andanarbor(orhydraulic)presstoinstallthe
bearingsontheshaft.



Wheninstallingthebearingsontotheshaft,neverpressor
hitagainsttheouterrace,ballsorballcage.
Presstheoutboardoilseal(13)intothebearingcap(10)
withthelippositionasshowninFigure5a.Replacethe
bearingcapgasket(17),andsecurethebearingcapwith
hardware(15and16).Becarefulnottodamagetheoil
seallipontheshaftkeyway.
Lubricatethebearinghousingasindicatedin
LUBRICATION.
SealInstallation
(Figures5aand5b,7,8,and9)
Mostcleaningsolventsaretoxicandflammable.Use
themonlyinawell‐ventilatedareafreefromexcessive
hear,sparks,andflame.Readandfollowallprecautions
printedonsolventcontainers.
Cleanthesealcavityandshaftwithaclothsoakedinfresh
cleaningsolvent.Inspectthestationaryseatboreinthe
sealplatefordirt,nicksandburrs,andremoveanythat
exist.Thestationaryseatboremustbecompletelyclean
beforeinstallingtheseal.

Anewsealassemblyshouldbeinstalledanytimetheold
sealisremovedfromthepump.Wearpatternsonthe
finishedfacescannotberealignedduringreassembly.
Reusinganoldsealcouldresultinprematurefailure.
Toeaseinstallationoftheseal,lubricatetheshaftsleeve
O‐ringandtheexternalstationaryseatO‐ringwithavery
smallamountoflightlubricatingoil.SeeFigure7forseal
partidentification.
Ifthesealplatewasremoved,installthesealplategasket
(2).Positionthesealplateovertheshaftandsecureitto
thebearinghousingwiththehardware(19and20).
TopreventdamagingtheshaftsleeveO‐ring(29)onthe
shaftthreads,stretchtheO‐ringoverapieceoftubing1‐
Page|18


1/4”I.D.x1‐1/2”O.D.x2‐incheslong(32mmx38mmx51
mm).Slidethetubeovertheshaftthreaded,thenslidethe
O‐ringoffthetubeandontotheshaft.Removethetube,
andcontinuetoslidetheO‐ringdowntheshaftuntilit
seatsagainsttheshaftshoulder.
Wheninstallinganewcartridgesealassembly,remove
thesealfromthecontainer,andremovethemylarstorage
tabsfrombetweenthesealfaces.

Newcartridgesealassembliesareequippedwithmylar
storagetabsbetweenthesealfaces.Thesestoragetabs
mustberemovedbeforeinstallingtheseal.
LubricatetheexternalstationaryseatO‐ringwithlightoil.
Slidethesealassemblyontotheshaftuntiltheexternal
stationaryseatO‐ringengagestheboreinthesealplate.
CleanandinspecttheimpellerasdescribedinImpeller
InstallationandAdjustment.Installthefullsetofimpeller
shims(28)providedwiththeseal,andscrewtheimpeller
ontotheshaftuntilitisseatedagainsttheseal(seeFigure
8).
Continuetoscrewtheimpellerontotheshaft.Thiswill
pressthestationaryseatintothesealplatebore.
NOTE
Afirmresistancewillbefeltastheimpellerpressesthe
stationaryseatintothesealplatebore.
Asthestationaryseatbecomesfullyseated,thesealspring
compresses,andtheshaftsleevewillbreakthenylon
shearring.Thisallowsthesleevetoslidedowntheshaft
untilseatedagainsttheshaftshoulder.Continuetoscrew
theimpellerontotheshaftuntiltheimpeller,shims,and
sleevearefullyseatedagainsttheshaftshoulder(see
Figure9).
Measuretheimpeller‐to‐sealplateclearance,andremove
impelleradjustingshimstoobtaintheproperclearanceas
describedinImpellerInstallationandAdjustment.
Ifnecessarytoreuseanoldsealinanemergency,
carefullyseparatetherotatingandstationarysealfaces
fromthebellowsretainerandstationaryseat.

Anewsealassemblyshouldbeinstalledanytimetheold
sealisremovedfromthepump.Wearpatternsonthe
finishedfacescannotberealignedduringreassembly.
Reusinganoldsealcouldresultinprematurefailure.
Handlethesealpartswithextremecaretoprevent
damage.Becarefulnottocontaminateprecision‐finished
faces;evenfingerprintsonthefacescanshortenseallife.
Ifnecessary,cleanthefaceswithanon‐oilbasedsolvent
andaclean,lint‐freetissue.Wipelightlyinaconcentric
patterntoavoidscratchingthefaces.
Carefullywashallmetallicpartsinfreshcleaningsolvent
andallowtodrythoroughly.

Donotattempttoseparatetherotatingportionoftheseal
fromtheshaftsleevewhenreusinganoldseal.The
rubberbellowswilladheretothesleeveduringuse,and
attemptingtoseparatethemcoulddamagethebellows.
Inspectthesealcomponentsforwear,scoring,grooves,
andotherdamagethatmightcauseleakage.Inspectthe
integralshaftsleevefornicksorcutsoneitherend.If
componentsareworn,orthesleeveisdamaged,replace
thecompleteseal;nevermixoldandnewsealparts.
Installthestationarysealelementinthestationaryseat.
Pressthisstationarysubassemblyintothesealplatebore
untilitseatssquarelyagainsttheboreshoulder.Apush
tubemadefromapieceofplasticpipewouldaidthis
installation.TheI.D.ofthepipeshouldbeslightlylarger
thantheO.D.oftheshaftsleeve.
Slidetherotatingportionoftheseal(consistingofthe
integralshaftsleeve,springcenteringwasher,spring,
bellowsandretainer,androtatingelement)ontotheshaft
untilthesealfacescontact.
ProceedwithImpellerInstallationandAdjustment.

Page|19


ImpellerInstallation
(Figure2)
Inspecttheimpeller,andreplaceitifcrackedorbadly
worn.Inspecttheimpellerandshaftthreadsfordirtor
damage,andcleanordressthethreadsasrequired.

Theshaftandimpellerthreadsmustbecompletelyclean
beforereinstallingtheimpeller.Eventheslightestamount
ofdirtonthethreadscancausetheimpellertoseizeto
theshaft,makingfutureremovaldifficultorimpossible
withoutdamagetotheimpellerorshaft.
Installthesamethicknessofimpelleradjustingshims(28)
aspreviouslyremoved.Apply‘Never‐Seez’orequivalent
totheshaftthreadsandscrewtheimpellerontotheshaft
untiltight.Besurethesealspringseatssquarelyoverthe
shoulderonthebacksideoftheimpeller.
NOTE
Attheslightestsignofbinding,immediatelybackthe
impelleroff,andcheckthethreadsfordirt.Donottryto
forcetheimpellerontotheshaft.
Aclearanceof.025to.040inch(0.64to1.02mm)
betweentheimpellerandthesealplateisrecommended
formaximumpumpefficiency.Measurethisclearance,
andaddorremoveimpelleradjustingshimsasrequired.
NOTE
Iftherotatingassemblyhasbeeninstalledinthepump
casing,thisclearancemaybemeasuredbyreaching
throughtheprimingportwithafeelergauge.
NOTE
ProceedwithRotatingAssemblyInstallationbefore
installingtheimpellercapscrewandwasher(22and23).
Therotatingassemblymustbeinstalledinthepumpcasing
inordertotorquetheimpellercapscrew.
Aftertherotatingassemblyisinstalledinthepumpcasing,
coatthethreadsoftheimpellercapscrew(22)with
‘Never‐Seez’orequivalentcompound,andinstallthe
impellerwasher(23)andcapscrew;torquethecapscrew
to90ft.lbs.(1080in.lbs.or12.4mkg.).
RotatingAssemblyInstallation
(Figure1)
NOTE
Ifthepumphasbeencompletelydisassembled,itis
recommendedthatthesuctioncheckvalveandbackcover
assemblybereinstalledatthispoint.Thebackcover
assemblymustbeinplacetoadjusttheimpellerface
clearance.
InstallthebearinghousingO‐ring(11)andlubricateitwith
lightgrease.Easetherotatingassemblyintothepump
casingusingtheinstallationtool.Becarefulnotto
damagetheO‐ring.
Installthefoursetsofrotatingassemblyadjustingshims
(15)usingthesamethicknessaspreviouslyremoved.
Securetherotatingassemblytothepumpcasingwiththe
hardware(13and14).Donotfullytightenthecapscrews
untilthebackcoverhasbeenreinstalledandtheimpeller
faceclearancehasbeenset.
Aclearanceof.010to.020inch(0.25to.51mm)between
theimpellerandthewearplateisalsorecommendedfor
maximumpumpefficiency.Thisclearancecanbe
obtainedbyremovinganequalamountofshimsfrom
eachrotatingassemblyshimsetuntiltheimpellerscrapes
againstthewearplatewhentheshaftisturned.Afterthe
impellerscrapes,addapproximately.015inch(0.4mm)of
shimstoeachshimset.
NOTE
Analternatemethodofadjustingthisclearanceistoreach
throughthesuctionportwithafeelergaugeandmeasure
thegap.Addorsubtractrotatingassemblyshims
accordingly.
SuctionCheckValveInstallation
(Figure4a)
Inspectthecheckvalveassembly(33),andreplaceifbadly
worn.


Page|20
