Dismantling & Reassembly - Grundfosnet.grundfos.com/Appl/ccmsservices/public/literature/...Repeat these steps until you get down to the last impeller. At that time, gently knock the

CR SeriesTORQUES

CONTENTSDismantling Procedures .......................................... Page 2 When Should A Part Be Replaced ? .............................. Page 8

Reassembly Procedures .......................................... Page 9 Setting The Coupling Height ..........................................Page 16 OrderofStageAssembly:CR(I/N)1S•1•3 ..................... Page 17 OrderofStageAssembly:CR(N)3LowNPSH .............Page 18 OrderofStageAssembly:CRNE1•3HighSpeed........Page 19 Order of Stage Assembly: CR(I/N) 5 .............................Page 20 OrderofStageAssembly:CR(N)5LowNPSH .............Page 21

CR, CRI, CRN 1S•1•3•5Dismantling &

Reassembly

PositionNumber 7a CouplingGuardScrew ............ 2 ft.-lbs./2.5 Nm 9 CouplingHexScrew M6Screw ...............................10ft.-lbs./13Nm M8Screw ..............................20 ft.-lbs./27 Nm M10Screw ........................... 46 ft.-lbs./62 Nm 28 Motor Bolt UNC3/8"Bolt .......................10ft.-lbs./13Nm UNC1/2"Bolt ........................23ft.-lbs./31Nm 36 StayboltNut CR/CRI ...................................29 ft.-lbs./40 Nm CRN ......................................37ft.-lbs./50.2Nm 67 ShaftLockNut .......................13.3ft.-lbs./18Nm 105 Shaft Seal 36mmNut ...........................26ft.-lbs./35Nm 113 2.5mmSetScrew ................ 2 ft.-lbs./2.5 Nm 146 HexScrewforPos.147/148 ..6ft.-lbs./8.13Nm 147 Stationary Seal Retainer .......26ft.-lbs./35Nm 149 Connecting Pipe ......................26ft.-lbs./35Nm

GRUNDFOS CR SERVICE MANUAL

2

Remove the four 19 mm Staybolt Nuts (Pos.36)andWashers(Pos.66a).

Remove the Hex Head Coupling Bolts (Pos. 9) from the Coupling Halves (Pos. 10a). Remove Coupling Halves and the Shaft Pin (Pos. 10).

Remove the cartridge Shaft Seal (Pos. 105) by:

·Looseningthethree2.5mmShaftSealSecuringAllenScrews(Pos.113).Donot fully removescrewsasthismaycausethesealassemblytocomeapartincomponentform.

·Using00SV2007ora36mmdeepsocket. FullyunscrewtheShaftSealfromtheMotor Stool (Pos. 2) or Pump Head (Pos. 77) on I and N models.

·SlidetheShaftSealupandofftheShaft(Pos.51).

Usingascrewdriver,removeCouplingGuardScrews(Pos.7a).Then,removethe Coupling Guards (Pos. 7).

These instructions cover the repair of stackafterthepumphasbeenisolatedfrom the system. Before removing the pump from the system, makesure all valves are closed. Relieve any built up pressure by opening the vent plugscrew.Thepowersourceshouldbe turned off and locked out beforestarting any work. Removal of fieldwiring to the motor wires may berequired. Color coding or numbering thewireswillaidinreinstallation.

Remove the Motor Bolts (Pos. 28) and lift the motor off the Motor Stool (Pos. 2).

RemovetheMotorStool(Pos.2)andPumpHead(Pos.77)onIandNmodels.(Lightupwardblowswitharubbermalletmayberequired.)

•Ifthepumpisastandardunit,skiptostep18.•ForCool Top™type/equippedpumps,seesteps7to9.•PumpsbuiltwithaBack-to-Back Seal,seesteps10to13.•PumpsbuiltwithTandem/Quench Seal,seesteps14to17.

1 2

3 4

5 6

Dismantling Procedures CR, CRI, CRN 1s•1•3•5

Dismantling Procedures CR, CRI, CRN 1s•1•3•5 – Cool Top™

3

Usea36mmwrenchordeepsockettoloosen.UnscrewtheConnectingPipe(Pos.149);liftoffandchecktheO-rings(Pos.109a&b).Ifdamaged,remove.

Tocontinue,proceedtostep18.

Remove the Cool Top assembly/Pump Head Cover (Pos. 77a). Light blowswitharubbermalletmayberequiredto loosen assembly.

7

IftheDiskPlate(Pos.79)remainedinthePumpHead(Pos.77),useapunchandrubbermallettodrivetheplateout.IftheDiskPlateremainedinthePumpHeadCover(Pos.77a),usearubbermallettofreetheplateandliftitoff.

8

Cool Top™

9

NOTE:WhenperformingthenextstepbeawarethereisspringtensionagainsttheSealDriver.

Loosen,butdonotfullyremovethetwoSetScrews(Pos.113)oftheInboardSealDriver(Pos.112a).Slidethedriverupandofftheshaft.Removetheremainingcomponents:LargerSealDriver(Pos.112),Spring(Pos.108),SmallSealDriver(Pos.111),O-ring(Pos.107),RotatingSeal Face (Pos. 104).

4

Dismantling Procedures CR, CRI, CRN 1s•1•3•5 – Back-to-Back Seal

Back-to-Back Seal

Usespecialtytool,00SV2007,ora36mmdeepsockettoloosen.UnscrewtheStationarySealRetainer(Pos.147).LiftoffandchecktheO-ring(Pos.109a).Ifdamaged,remove.

Tocontinue,proceedtostep18.

Loosenandremovethethree2.5mmHexScrews(Pos.146).RemovetheStationarySealRetainingWasher(Pos.148).RemovetheStationarySeal(Pos.103)andO-ring(Pos.102).

10

Remove the Pump Head Cover (Pos.77a). Lightblowswitharubbermallet may be required to loosen assembly.

11 12

13

Slide the Inboard Seal (Pos. 105b) up andofftheshaft.

Use specialty tool, 00SV2007, or a36mmdeepsockettoloosen.Unscrewthe Inboard Seal.

Remove the Pump Head Cover (Pos.77a). Lightblowswitharubbermallet may be required to loosen assembly.

Tocontinue,proceedtostep18.

15 16

17

Dismantling Procedures CR, CRI, CRN 1s•1•3•5 – Tandem/Quench Seal

14

Loosen the three 2.5 mm SetScrews (Pos. 113)of the InboardSeal(Pos. 105b).

Tandem/Quench Seal

5

6

Dismantling Procedures CR, CRI, CRN 1s•1•3•5

Remove the Chamber with bearing(Pos. 4a) or Chamber (Pos. 4). If it is stuck to the restof thestack,pryit loose by inserting a screwdriverbetweenthechambers.

Move the shaft into a hole of the shaft holderthroughwhichitcanpassfreely.ScrewthePunchforDismantlingShaft(material#00SV0234)ontothethreadedsectionofshaft.Usingahammer,drivepunch down past the hub of the firstimpeller. Noting chart instructions in step23,removeeachimpeller(Pos.49a)andChamberwithbearing(Pos.4a)andChamber (Pos. 4).

Repeatthesestepsuntilyougetdowntothelastimpeller.Atthattime,gentlyknockthepunchdownthroughthehubarea,makesuretocatchtheshaftasitfalls free. Go to step 24.

Place the Holder for Shaft (00SV0040) in a vise. With the shaft pin inserted into the shaft,placetheimpellerstackintotheshaftholder.Tightenvise.Usinga13mmwrench,removetheLockNut(Pos.67),Washer(Pos.66),andSpacer(Pos.64a).

LifttheImpeller(Pos.49a)offtheshaft.Ifitcomesofffreely,proceedtostep22.Ifitisstuckandcannotberemovedbyhand,proceedtostep21.

The dismantling procedures from thispointwilldependonthetypeof pump and number of stages it contains.Beginningonpage17,referto the charts in the Reassembly Procedurestodeterminewhatyoucanexpectwiththepumpyouareworkingon.

Remove all the Bearing Rings(Pos.47a)andSpacers(Pos.64a,c,d)youencounterwhilerepeatingsteps20-22. Continue until you remove the last impeller.

Remove the shaft and examine for damage.Atthatpoint,continue...

19

20 21

22

18

Grabtheshaftandliftimpellerstackoutofthepump.Ifitisstuck,alightblow with a rubber mallet may beneeded to jolt the stack free. Thebottom chamber (Pos. 5a) may remain in the suction/discharge chamber.

Using the Puller for Neck Ring(material #00SV0239) to work theSeal Ring Retainer (Pos. 65), loosenand remove. Remove Seal Ring (Pos. 45).

2423

Dismantling Procedures CR, CRI, CRN 1s•1•3•5

7

26

27

Ifthepumpshowsleakagearoundthesleeve(Pos.55),removalofthesleevemayberequired.GriptheStaybolts(Pos.26)diagonally.Usingyourthumbs,pressagainstthesleevetoreleaseitfromtheSuction/Dischargepumphousing(Pos.6).Liftoffsleeve.

NOTE:Lightblowswitharubbermalletmayberequiredtofreesleeve.

25

If the Bottom Chamber (Pos. 5a) has not already been removed, use ascrewdrivertopryitoutofthepumphousing.

THE PUMPIS NOW

COMPLETELY DISASSEMBLED!

Using a screwdriver, remove Corrugated Spring (Pos. 60):For standard CR: remove the Outer Sleeve O-ring (Pos. 37) from the Motor Stool(Pos. 2).For CRI, CRN, Cool Top, Back-to-Back Seal, or Tandem Seal equipped pumps: remove the O-rings from the Pump Head (Pos. 77) and Pump Head Cover (Pos. 77a). Note: The Corrugated Spring is located in the pump head cover.Onallmodels,removetheSleeveO-ringfromtheSuction/DischargeChamber(Pos.6).

8

Reassembly Procedures CR, CRI, CRN 1s•1•3•5

When Should A Part Be Replaced ?Part Position(s) Minimum Operating Condition

MotorStool 2 Excessivepittingofthesecastingscouldcauseleaks.Rustedcastings should have all seating areas cleaned to ensure proper seating of O-rings.

Suction/Discharge 6Chamber

Chambers 4a,4 Sameasforimpellers.Themaximuminsidediameterforthe bearing in position 4a is 17.52 mm. If a groove can be

seenorfelt,thechambershouldbereplaced.

NeckRing 45 Shouldbefreeofvisiblewearontheinsideedges InsidediameterforCR1s,1,&3=30.6±.05mm InsidediameterforCR5=.25±.01mm

Bearingring 47a Minimumoutsidediameteris17.349mm.Ifagroovecanbeseenorfelt,thebearingshouldbereplaced.

Impellers 49 Shouldbefreefromphysicalmarkingsexceptfortheguidevanewelds.TheeyeletorcontactsurfacefortheNeckRingshouldnotshowanysignsofwear.

(1) Cavitationtheimplosionofvapor"bubbles"withintheimpellerstack.MakesuretheNetPositiveSuction Head Available for the pump meets the minimum Net Positive Suction Head Required for thepumpwhenrunningattherequiredflow.

(2) Improper coupling height. If the coupling is not set totheproperheight(seestep33oftheReassemblyprocedures) the impellers are not suspended as they should be,causingthemtorubagainstthechambers,causingwear.

Shaft 51 Smoothareaatthetopofshaftshouldbefreeoffittinggrooves.Splineshouldnotbeworn.

Sleeve 55 Shouldnotbepittedorcracked.

CorrugatedSpring 60 Shouldnothaveanycracksinmaterial.

Spacers&Clamp 64,64a,64c,66,66b,69 Shouldshownosignsofgougingorwearatbottomortop.

LockNut 67 Shouldnotbereused....replace.

LockWashers 66 Shouldnotbereused....replace.

O-rings 37,38,68,100,102,109a&b Shouldbesoftandpliablewithnovisiblescars.Sincetheyareeasilydamagedandfairlyinexpensive,itisrecommendedtheybereplacedwheneverthepumpisdisassembled.

ShaftSeal 105 Sealsmfg.afterJanuary,2003cannotbedisassembled;shouldbereplacedwhenrepairing/rebuildingthepump.

Connecting Pipe 149 If bushing is scored....replace.

}

Refer to the Parts List and Kits section for a list of material numbers and spare pare kits.

Reassembly Procedures CR, CRI, CRN 1s•1•3•5

9

With Shaft Pin (Pos. 10) inserted into the Shaft (Pos. 51), place shaft intoShaft Holder (material #00SV0040).

PlaceSleeveO-ring(Pos.37)intorecessedareaoftheMotorStool(Pos.2)forCRmodels,orintothePumpHead(Pos.77)forCRI,CRNmodels.InstallSleeveO-ring(Pos.37b)intoPumpHeadCover(Pos.77a)forCRI,CRN,CoolTop,Back-to-BackSeal,TandemSealmodels. Install O-ring into Suction/Discharge Pump Housing (Pos. 6). Note specialty O-ring(Pos.37b)willalwaysbeinstalledinthelower"Hot"sectionofthepumpofCool Top models.

ReplaceanySealRing(Pos.45)intheChambers(Pos.4,4a,and5a).Inneredgemustfacedownward(seediagram).SnapSealRingRetainer(Pos.65)intoplace.Theretainershouldnotspinonthechamber,andthesealringshouldmovefreelyfromsidetoside.

The reassembly procedures from this point will depend on the typeof pump and the number of stages it contains. Refer to diagrams on pages 17-21 to determine the proper sequence of impellers (Pos. 49 or 49a),Chambers(Pos.4,4a),Spacers(Pos. 64 a, c, d) and Bearing Ring(Pos. 47a) needed for the pump you areworkingwith.

Reassemble these stages in the order shown,beginningwith thehighestnumber stage and continue to the firststage.

Then,continue....

2

3

5

Place the Clamp Spacer (Pos. 64c) onto the shaft.

7

1

Before reusing the

originalShaft(Pos.51),

use a light grit emery

clothtosmoothaway

old set screw marks,

as these can cut the

O-rings in the seal

assembly.

4

To Install Corrugated Spring (Pos. 60):For standard CR: install into the Motor Stool (Pos. 2).For CRI, CRN: install into Pump Head (Pos. 77) For Cool Top, Back-to-Back Seal, & Tandem Seal: install into the Pump Head Cover (Pos. 77a) Edgesofspringmustpointdownwardasshownforallmodels.

6

10

Reassembly Procedures CR, CRI, CRN 1s•1•3•5

If the Top Guide Vane (Pos. 50a) has not alreadybeenplacedonto the stack,addthisnow.Standard CR (I/N) modelsskiptostep25Cool Top modelsskiptostep13Back-to-Back Seal modelsskiptostep16Tandem Seal modelsskiptostep23.

Lubricate the threaded end of theshaftwithanFDA-approvedlubricant.ThreadtheLockNut(Pos.67)ontotheshaftandtorqueto13.3ft.-lbs./18Nm.

SpraysoapywaterontheSleeveO-rings(Pos.37or37b).LowerandpresstheSleeve(Pos. 55)firmly intoplace. If the sleevedoesnot slideeasilyover theO-ring...STOP.RemovethesleeveandsleeveO-ring.StretchtheO-ring,placetheO-ringbackintothegrooveofthehousingandproceedwithsleeveinstallation.

9

10

12

TheLockWashers(Pos.66)comeasaset.Iftheybecomeseparated,itisimportantthewashersarerepositionedcorrectlyasnotedinthediagram.Thetabsshouldinterlockwhiletheserratededgesbothpointoutward.Placethewashersontotheshaft.

8

11

After the Bottom Chamber (Pos. 5a) has beenplacedontothestack,removethestackassemblyfromtheshaftholderandturnitover.Lowerthestackintothe Suction/Discharge pump housing.

Reassembly Procedures CR, CRI, CRN 1s•1•3•5 – Cool Top™

11

Spray soapy solution into the center hole of the Disk Plate (Pos. 79), andpresstheplatefirmlyinplace.Beforeproceeding to step 15, flip the PumpHeadover;makesuretheCorrugatedSpring (Pos. 60) and the Sleeve O-ring (Pos. 37b) have been installed fromsteps 1 and 2. If they have not been installed, follow the instructions inthosesteps,thenproceedtostep15.

14 15

Position the plugs to the desired location;lowerthecompletedCoolTopPump Head Assembly (Pos. 77a) over the shaft and seat on the Sleeve (Pos. 55). If it does not freely seat onto the sleeve...STOP. Remove the pump head and turn over. Remove sleeve O-ring and stretch. Replace and reinstall the pumpheadontoshaftandsleeve.Skipto step 25.

PlaceO-rings(Pos.109a&b)ontotheConnectingPipe(Pos.149).DonotrolltheO-rings;theyshouldbestretchedoverandreleasedintoplacetopreventcuttingthematerialduringinstallationintothehousing.SpraysoapysolutionontoO-ringsandhousing.ScrewtheconnectionpipeintothepreppedCoolTopAssembly/PumpHeadCover(Pos.77a).Usinga36mmwrenchordeepsocket,torqueto26ft.-lbs./35Nm.

13

Cool Top™

Place O-ring (Pos. 102) onto the Stationary Seal (Pos. 103). Spray soapy solutiononto the O-ring and press onto the threaded seal retainer. Place the Retaining Ring (Pos.148)overtheseal.Installthethree2.5mmHexScrews(Pos.146).Torquescrewsto6ft.-lbs./8.13Nm.

Place O-rings (Pos. 109a) onto the threaded Stationary Seal Retainer (Pos. 147). Do not rolltheO-ring;instead,stretchitoverandreleaseintoplace.Thiswillpreventcuttingthe material during installation into the housing. Spray soapy solution onto O-ring and housing.ScrewthestationarysealretainerintothepreppedPumpHeadCover(Pos.77a).Usingthespecialtytool,00SV2007,ora36mmdeepsocket,torqueto26ft.-lbs./35Nm.

Beforeproceedingtostep17,flipthePumpHeadover.MakesuretheCorrugatedSpring(Pos.60)andtheSleeveO-ring(Pos.37b)havebeeninstalledfromsteps1and2.Iftheyhavenotbeeninstalled,followthoseinstructionsandproceedtostep17.

16

18

17

(112b)Seal Driver(113)withscrews

(112)LargeSealDriver

(108)Seal Spring

(111)Small SealDriver

(107)O-ring

(104)RotatingSeal Ring

(148)StationaryRing Retainer

(103)StationarySeal Ring

(102)O-ring

Back-to-Back Seal

12

Reassembly Procedures CR, CRI, CRN 1s•1•3•5 – Back-to-Back Seal

Install the InboardRotatingShaftSeal (Pos. 104),O-ring (Pos. 107),SmallSealDriver(Pos.111).Makesurethetabsofthedriverclearthetabsoftherotatingseal.Next,installtheSealSpring(Pos.108),followedbytheLargeSealDriver(Pos.112).

NOTE: When performing the next step,beawarethereisspringtensionagainst the Seal Driver. Lower the Seal Driver (Pos. 112a).EngagetheslotofPos.112awiththetabsofPos.112.TightenthetwoSetScrews(Pos.113)to2ft.-lbs./2.5Nm.Ameasurementof92mmor3.6inchesfrom the top of the shaft to the upper edge of driver 112a must be maintained. See step 22.

21

Position the plugs to the desired location.LowerthecompletedPumpHead Assembly (Pos. 77a) over the shaft and seat on the Sleeve (Pos. 55). If it does not freely seat onto the sleeve...STOP. Remove the pump head and turn over. Remove sleeve O-ring and stretch. Replace and reinstall the pump head onto shaft and sleeve.

19

22

Proper shaft seal positioning from top of shaft and seal tab engagement. Proceed to step 25.

Reassembly Procedures CR, CRI, CRN 1s•1•3•5 – Back-to-Back Seal

20

Back-to-Back Seal

13

Position the plugs to the desired location.LowerthecompletedPumpHead Assembly (Pos. 77a) over the shaft and seat on the Sleeve (Pos. 55). If it does not freely seat onto the sleeve...STOP. Remove the pump head and turn over. Remove sleeve O-ring and stretch. Replace and reinstall the pump head onto shaft and sleeve.

23

SlidetheInboardSeal(Pos.105b)downtheshaftandthreadintothepumphead.Usespecialtytool,00SV2007,ora36mmdeepsockettotorquetheInboardSealto26ft.-lbs./35Nm.Donot tightenthethree2.5mmsetscrewsatthistime;thiswillbedoneafterstep35.

24

Tandem Seal

14

Reassembly Procedures CR, CRI, CRN 1s•1•3•5 – Tandem Seal

Reassembly Procedures CR, CRI, CRN 1s•1•3•5

15

Install Motor Bolts (Pos. 28) and diagonally tighten to the proper torque.UNC3/8"bolt-10ft.-lbs./13.55NmUNC1/2"bolt-23ft.-lbs./31Nm

SpraysoapywaterontothesealO-ringseating surface of the Motor Stool/Pump Head and Shaft (Pos. 51).

Place the Washers (Pos. 66a) over the Staybolts(Pos.26). Lubricatewithalight oil. Place the 19 mm Staybolt Nuts (Pos. 36) onto staybolts and torquediagonally to:

CR/CRI: 29.5 ft.-lbs./40 NmCRN: 37 ft.-lbs./50.2 Nm

LowerthenewShaftSeal(Pos.105)overtheshaft.Usespecialtytool,00SV2007,ora36mmdeepsockettotorqueSealto26ft.-lbs./35Nm.Donot tighten the three 2.5 mm setscrewsatthistime.Thiswillbedoneafterstep34.

Place Shaft Pin (Pos. 10) into the Shaft (Pos. 51).

26 27

28

30 31

25

Spray soapy solution onto the Sleeve O-rings (Pos. 37) in the Motor Stool (Pos. 2) for standard CR,orPump Head (Pos. 77) for CRI, CRN.Lowerandfullypress into seat onto the Sleeve (Pos. 55).Iftheydonoteasilyfitinplace...STOP. Remove the pump head and turn over. Remove sleeve O-ring and stretch. Replace and reinstall the pump head onto shaft and sleeve.

Lowerthemotorontothemotorstool.

29

Install Coupling Halves (Pos. 10a). Apply a light machinery oil onto the Coupling Bolts (Pos. 9). Install bolts loosely into coupling halves.

32

16

Reassembly Procedures CR, CRI, CRN 1s•1•3•5

Install the Coupling Guards (Pos. 7) and tightentheScrews(Pos.7a).Torqueto2 ft.-lbs./2.5 Nm.

Spring tension from the Inboard Seal forces the shaft upward. Lower theshafttoitsfulltraveldownward,thenallow it to return half the distanceupwardandtorquecouplingbolts.

M6to10ft.-lbs./13NmM8 to 20 ft.-lbs./27 NmM10 to 46 ft.-lbs./62 Nm

Spintheshaftbyhand;proceedonlyif the shaft spins freely. If the shaft does not spin freely, stop and startover. Inspect the components for any cause of binding. Tighten the three 2.5 mmshaftseal,securingscrews(Pos.113) to the shaft. Finish torque of 2ft.-lbs./2.5 Nm.

34

35

37

UsespecialtyTorqueScrewdriver(00SV0438),extensionfittingfromBitsKit(00SV2010),and2.5mbit(00SV2012)totorquetoInboardShaftSealSecuringScrews(Pos.113).Inserttool in through the plug holes of the Pump Head (Pos. 77a). Torque to 2 ft.-lbs./2.5 Nm. Aftersettingseal,installplugs.

Usingascrewdriver, lifttheshafttoitsfulltravelupward;lowerhalfthedistance and torque coupling bolts.

M6to10ft.-lbs./13NmM8to23ft.-lbs./31NmM10 to 46 ft.-lbs./62 Nm

Tandem Seal Equipped Pump Only36

THE PUMPIS NOW

COMPLETELY ASSEMBLED.

Ensurethegapbetweenthetwocouplinghalvesiseven.

33 Standard and Tandem Equipped Seal Models 33 Back-to-Back

Equipped Seal Models

NOTES: 1. If an impeller is to be permanently removed (pump

destaged),thethicknessoftheimpellerbackplate/hubarea must be compensated for. Use a longer spacer or combinationofspacersthatequalthethicknessofbackplate/hub area material.

2. Since proper reassembly of the impeller stages must be done "upsidedown,"thischarthasbeenarrangedthatwayforyourconvenience.Impellereyelet(opening)facesupwardawayfromvise.

Legend

Part Combination A Part Combination B Part Combination C

Order of Stage Assembly – Models CR(I/N) 1s•1•3

Part Combination D

Reassembly Procedures CR, CRI, CRN 1s•1•3•5

17

A

49Impeller

4Chamber-CPL

64Spacing Pipe

66Star Washer

64cClamp

B C D

69Spacing Pipe

4Chamber-CPL

67LockNut

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this

end

Bott

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3/2 3 4 5 6 7 8 9 10 11 12 13 15 17 19 21 23 25 27 29 30 31 33 36Number of chambers

123456789101112131415161718192021222324252627282930313233343536

47aBearing Ring

4aChamberwithBearing

64aSpacing Pipe

49Impeller

49Impeller

Stages

3/2

LegendOrder of Stage Assembly – Models CR/CRN3 (Low NPSH)

18

Reassembly Procedures CR, CRI, CRN 1s•1•3•5

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end

Bott

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123456789101112131415161718192021222324252627282930313233343536

NOTES: 1. If an impeller is to be permanently removed (pump

destaged),thethicknessoftheimpellerbackplate/hubarea must be compensated for. Use a longer spacer or combinationofspacersthatequalthethicknessofbackplate/hub area material.

2. Since proper reassembly of the impeller stages must be done "upsidedown,"thischarthasbeenarrangedthatwayforyourconvenience.Impellereyelet(opening)facesupwardawayfromvise.

3 4 5 6 7 8 9 10 11 12 13 15 17 19 21 23 25 27 29 30 31 33 36Number of chambers

Part Combination B Part Combination C Part Combination D

4Chamber-CPL

49Impeller

4Chamber-CPL

B C D64Spacing Pipe 69

Spacing Pipe

4aChamberwithBearing

49Impeller

47aBearing Ring

64aSpacing Pipe

Part Combination A

A

64cClamp

49iImpeller

66 Star Washer

67 LockNut

5aBottom Chamber-CPL

Stages

Reassembly Procedures CR, CRI, CRN 1s•1•3•5

19

LegendOrder of Stage Assembly – Models CRNE 1•3 (High Speed)

Part Combination A Part Combination B Part Combination B– Part Combination C

A

64cClamp

66 Star Washer

67 LockNut

4aChamber withBearing

4Chamber-CPL

49Impeller

B B– C

47aBearing Ring

64Spacing Pipe

64bSpacing Pipe 4a

ChamberwithBearing

47aBearing Ring

Part Combination D

5aReinforced Chamber-CPL

D

49Impeller

NOTES: 1. If an impeller is to be permanently removed (pump

destaged),thethicknessoftheimpellerbackplate/hubarea must be compensated for. Use a longer spacer or combinationofspacersthatequalthethicknessofbackplate/hub area material.

2. Since proper reassembly of the impeller stages must be done"upsidedown,"thischarthasbeenarrangedthatwayforyourconvenience.Impellereyelet(opening)facesdownwardtowardvise.

Begi

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1234567891011121314151617181920212223

49Impeller

64aSpacing Pipe

49Impeller

64aSpacing Pipe

138O-ring Retainer

139O-ring

64aSpacing Pipe

64Spacing Pipe

142Upper Guide Ring

137LowerGuideRing

143Corrugated Spring

Stages

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end

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20

Reassembly Procedures CR, CRI, CRN 1s•1•3•5

LegendOrder of Stage Assembly – Models CR(I/N) 5

Part Combination A Part Combination A– Part Combination B Part Combination B–

A

64cClamp

66 Star Washer

67 LockNut

A– B B–

49Impeller

4aChamber withBearing

49Impeller

47aBearing Ring

64aSpacing Pipe

NOTES: 1. Ifanimpelleristobepermanentlyremoved(pumpdestaged),thethicknessofthe

impellerbackplate/hubareamustbecompensatedfor.Usealongerspacerorcombinationofspacersthatequalthethicknessofbackplate/hubareamaterial.

2. Sinceproperreassemblyoftheimpellerstagesmustbedone"upsidedown,"thischarthasbeenarrangedthatwayforyourconvenience.Impellereyelet(opening)facesupwardawayfromvise.

Part Combination C

C

Part Combination D

D

123456789101112131415161718192021222324252627282930313233343536

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 20 22 24 26 29 32 36Number of chambers

64cClamp

66 Star Washer

67 LockNut

49Impeller

64dSpacing Pipe

4aChamberwithBearing

49Impeller

47aBearing Ring

64aSpacing Pipe

69Spacing Pipe

4Chamber-CPL

64Spacing Pipe

49Impeller

4Chamber-CPL

64Spacing Pipe

49Impeller

69Spacing Pipe

Stages

Reassembly Procedures CR, CRI, CRN 1s•1•3•5

21

LegendOrder of Stage Assembly – Models CR/CRN 5 (Low NPSH)

Part Combination A Part Combination A– Part Combination B Part Combination B–

A

64cClamp

66 Star Washer

67 LockNut

A– B B–

64eSpacing pipe

4aChamberwithbearing

49Impeller

47aBearing ring

64aSpacing pipe

NOTES: 1. Ifanimpelleristobepermanentlyremoved(pumpdestaged),thethicknessoftheimpellerbackplate/hubarea

mustbecompensatedfor.Usealongerspacerorcombinationofspacersthatequalthethicknessofbackplate/hub area material.

2. Sinceproperreassemblyoftheimpellerstagesmustbedone"upsidedown,"thischarthasbeenarrangedthatwayforyourconvenience.Impellereyelet(opening)facesupwardawayfromvise.

3. BecausethelowNPSHchamberandimpelleraretwicethethicknessofastandardchamber,ithastheperformanceoftwoimpellers.Physically,thereisonelesschamberinastackthanthenumberofstageslistedonthe pump label (example: CR5-22 only has 21 chambers and impellers).

49iImpeller

64fSpacing pipe

64cClamp

66 Star Washer

67 LockNut

64eSpacing pipe

49iImpeller64fSpacing pipe

64dSpacing pipe

4aChamber withbearing

49Impeller

47aBearing ring

64aSpacing pipe

Part Combination C

C

Part Combination D

D

64Spacing Pipe

49Impeller

64Spacing Pipe

49Impeller

69Spacing Pipe

4ChamberCPL

4ChamberCPL

Begi

n re

asse

mbl

y on

this

end

Bott

om c

ham

ber

1234567891011121314151617181920212223242526272829303132333435

3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 20 22 24 26 29 32 36Number of chambers

69Spacing pipe

> >

Stages

SM-DRC-135 1011

GRUNDFOS Pumps Corporation17100 W. 118th TerraceOlathe,Kansas66062Phone:913.227.3400Fax:913.227.3500

www.grundfos.us

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