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1. Pos 108 until it fits over the Slide lower and firmly seat the uppermost outermost Pump Head Pos 2b onto the upper sleeve Proceed to step 46 LO GRUNDFOS 4 19 Reassembly Procedures CR H CRN H 32 45 64 90 Opposite the vent plug place the Cartridge Support Foot Pos 90c over the staybolts The angle should be facing downward toward the sleeve flange Place the Washers Pos 66a over the staybolts opposite the support foot Lubricate the threads on all of the staybolts with Gardolube or Thread Eze Loosely tighten the Staybolts Nuts Pos 36 do not torque at this time this will be done in step 52 The Cartridge Assembly Pos 80a is now ready to take back to where the Suction Discharge Base Pos 6 is located If the old O ring Pos 72a was not removed earlier remove now and clean the groove in Suction Discharge Base Pos 6 Next in four equal spaced areas place a liberal amount of Dow Corning 111 or Rocol into the groove Fit the new O ring into the groove ensuring it is fully seated and does not move out of position Before installing the Screws Pos 56c Washers Pos 56d and Nuts Pos 56e into the Sleeve Flange Pos 55b ensure the flange is fully seated there should not be any gap between the flange and the suction discharge base If there is a gap either the o ring from step 47 has moved out of place and is pinched or the flange is not properly engaged into the machined recess re
2. Pos 47g ack Seal continued Using a small flat tip screwdriver pry loosen the stationary seal from the Connecting Pipe Pos 149 Slide the seal off the shaft Loosen and i remove the m8 mm hex socket Retainer Screws Pos 58d Remove the Connecting Pipe Retainer Pos 58c Remove the O rings Pos 109a and 109b For reassembly of the seal and connecting pipe go tothe Reassembly section step 17 To continue disassembly proceed to step 40 Dismantling Procedures CR H CRN H 32 45 64 90 Loosen the top Coupling Guard Screw Pos 7a but do not fully remove Loosen and fully remove the lower screw Tilt and slide the Coupling Guards Pos 7 off of the system flush piping To remove the coupling halves insert a flat slot blade screwdriver in the coupling gap and twist to free the first coupling half Loosen but do not remove the 3 mm Set Screws Pos 113 from the Tandem Shaft Seal Pos 105c Tandem Seal To free remove the remaining coupling half strike the upper edge of the coupling half with a rubber mallet Note If you have multiple pumps do not interchange coupling components they are a matched set Loosen and remove the 8 mm hex socket Allen Screws Pos 58a holding the seal housing Use an Allen wrench with an 8 mm tip to loosen and remove the Coupling Screws Pos 9 from the Coupling Halves Pos 10a If the motor needs to be removed to change the seal
3. clamp washer alignment slide the Bottom Bearing Pos 6g over these items Placethe holding pin through the shaft to prevent it from spinning while the allen screw is tightened to a torque of 23 ft Ilbs 31Nm Remove the hold pin and the bottom bearing 6g after torque value is achieved After pressing on a new Wear Ring Pos 49c or if using a new Impeller Pos 49d e or i place the complete impeller over the shaft and seat into the interface assembly Slide the Split Cone Pos 49b down the shaft and into the recessed area of the impeller hub Use the split cone nut tool 00SV0004 in the inverted direction and firmly drive split cone into the impeller While performing this function care must be taken to avoid damaging the threaded hub area of the impeller To reinstall the Neck Ring Pos 45 the Neck Ring Retainer Pos 65 or complete Neck Ring Assembly Pos 45a place these components into the Chamber Pos 4 or 4a or Base Interface Pos 44 Position the appropriate neck ring punch e CR H CRN H 32 00SV0025 e CR H CRN H 45 00SV0027 e CR H CRN H 64 00SV0028 e CR H CRN H 90 00SV0029 onto the components to be inserted into the chamber or base interface Using a rubber mallet drive these components firmly in place Fit the shaft into the assembly disassembly fixture 00SV0003 Make sure the holding pin is inserted into the assembly hole Refer to the diagrams on pages 27 30 for the appropriat
4. Order of Stage Assembly 2 rae 1 Low NPSH Combination s Replacement Start for Low NPSH order 7 6 5 4 3 2 1 Low NPSH Combination Replacement For Low NPSH replace 44 Low NPSH units start with 2 1 and continue For Low NPSH to the 7 1 stage replace the first 49e with 49i with 44a NOTE Refer to Parts List for ALL position descriptions DNA GRUNDFOS 2 29 Being responsible is our foundation BE gt THINK gt INNOVATE gt Thinking ahead makes it possible Innovation is the essence CR H CRN H 90 Order of Stage Assembly Combination Replacement o Start for Low NPSH order NOWAOO Low NPSH Combination Replacement Low NPSH units start with 2 1 and continue For Low NPSH For Low NPSH to the 6 stage replace the first replace 44 49e with 49i with 44a NOTE Refer to Parts List for ALL position TA Pe descriptions L SM DR 101 01 10 30 PRINTED IN USA GRUNDFOS Pumps Corporation GRUNDFOS Canada Inc Bombas GRUNDFOS de Mexico S A de C V 17100 W 118th Terrace 2941 Brighton Road Boulevard TLC No 15 Olathe Kansas 66062 Oakville Ontario L6H 6C9 Canada Parque Industrial Stiva Aeropuerto Phone 913 227 3400 Phone 905 829 9533 Apodaca N L Mexico 66600 Fax 913 227 3500 Fax 905 829 9512 Phone 52 81 8144 4000 Cs re U ND FOS LS Fax 52 81 8144 4010 www grundfos com
5. and fairly inexpensive it is recommended they be replaced whenever the pump is disassembled O Neck Ring 45 Should be free of visible wear on the inside edges Inside diameter for CR H CRN H 32 66 2 mm CR H CRN H 45 73 9 mm CR H CRN H 64 86 3 mm O CR H CRN H 90 93 8 mm Bearing Ring 47a The diameter size difference between the Bearing Ring Pos 47a and the Bearing 47 fixed inside the intermediate chambers should be no greater than 0 4 mm e Bushing and Bearings 6g 47 47b 47c Wear to the inner surface on the chamber bushings Pos 47c fixed inside the intermediate chambers should be no greater than 0 6 mm The wear to the bottom 2 bearings Pos 6g and 47b should be no greater than 4 mm Impellers 49 a d e amp i Should be free from physical markings except for the guide vane welds Any additional identations may result from Ce 1 Cavitation the implosion of vapor bubbles within the impeller stack Make sure the Net Positive Suction Head Available for the pump meets the minimum Net Positive Suction Head Required for the pump when runnning at the required flow 2 Improper coupling height If the coupling is not set to the proper height see Reassembly procedures Back to Back steps 43 74 to 80 Standard amp Cool Top steps 74 to 80 Tandem Flush Seal steps 56 72 73 78 to 80 the impellers are not suspended as they should be but instead they rub against the chambers either above or below causing contact we
6. diagonally torque the allen screws to 46 ft lbs 62 Nm When reusing an existing shaft if the shaft has not already been cleaned first clean away any set screw marks off of the shaft with a light grit emery cloth Then wipe away dust before proceeding to the next step From the Seal Kit install the desired EPDM or FKM O ring Pos 110b into the groove at the bottom of the seal driver with sleeve Pos 112 Torque the Staybolt Nuts diagonally to 74 ft Ibs 100 Nm eee Lubricate the inner surface of the lower O ring of the Shaft Seal Pos 105 with Rocol Dow Corning 111 or soapy water Slide the seal down the shaft by pushing against the drive collar ofthe seal Seat the seal firmly in place For Tandem Seal equipped pump only continue with step 56 All other pump types Standard Cool top and Back to Back units skip to step 74 Slide the Spring Pos 108 over the sleeve DNA GRUNDFOS 2 21 Reassembly Procedures CR H CRN H 32 45 64 90 Fit the cup for O ring and Spring Pos 106 onto the spring Complete 105c Tandem Seal 112a Seal Driver Ring Assembly Exploded 113 Set Screw View Cc Q D 77a Seal Housing 109c O ring for Seal Housing 102 Upper O ring ty 103 Stationary Seal Face i oo 104 The tapered face Rotating Seal Face should point downward through the driver 111 and press against the O ring 107 111 Floating Se
7. engage each other Hold this housing down If the set screw holes are not fully accessible remove the housing and reposition the driver tabs Install the Seal Driver Ring Pos 112a Turn the 3 mm set screws until they just engage through the sleeve A cil J rnense N al Apply Rocol or am E Dow Corning 111 to the groove in the housing of the Tandem Seal Pos 105c Place the Turn the Tandem Flush Seal Assembly O ring Pos 105c over and remove the Pos 109 into Punch 0OSV0015 the groove of Pushing against the drive collar slide the tandem seal assembly down the shaft until it stops against the lower shaft seal the tandem seal housing J raens JA Lubricate the threads of the 8 mm Push down inward on the shaft and Pull the shaft outward and place the hex socket Retaining Screws Pos 58d evenly tighten Then torque the three Adjust Fork Spacing Tool 985924 with Gardolube or Thread Eze Install 3 mm set screws to 6 ft Ibs 8 Nm between the housing and seal driver and diagonally torque to 46 ft lbs 62 ring Nm Tandem Seal continues with step 78 Mw GRUNDFOS 4 23 Reassembly Procedures CR H CRN H 32 45 64 90 Standard Cool Top amp Back to Back Seal Units D pa ee a Lower and seat the Retainer Pos 58 Lubricate the threads of the 8 mm hex socket Retaining Screws Pos 58a with Gardolube or Thread Eze Install and diagonally torque the scr
8. GRUNDFOS CR SERVICE MANUAL CR H CRN H 32 45 64 90 Dismantling amp Reassembly CONTENTS Dismantling Procedures When Should A Part Be Replaced ssssssssssssssssssessses Page 12 Reassembly Procedures Setting The Coupling Height Order of Stage Assembly CR H CRN H 32 Order of Stage Assembly CR H CRN H 45 Order of Stage Assembly CR H CRN H 64 Order of Stage Assembly CR H CRN H 90 TORQUES Position Number 7a Screw for Guard 6 ft lbs 8 Nm 9 Coupling Screws 63 ft lbs 85 Nm 26b Allen Screw for Strap 11 ft lbs 15 Nm 28 Allen Screw Motor Stool to Pump Head 46 ft lbs 62 Nm Allen Screw for Motor 1 2 x 13 UNC 3 40 HP 30 ft lbs 40 Nm 5 8 x 11 UNC 50 60 HP 59 ft lbs 80 Nm Allen Screw for Foot Base 15 ft lbs 20 Nm Allen Screw for Bottom Stationary Bearing 6 ft lbs 8 Nm Allen Screw for Discharge Flange 15 ft lbs 20 Nm Staybolt Nut 74 ft lbs 100 Nm Split Cone Nut 52 ft lbs 70 Nm Allen Screw for Sleeve Flange CR H CRN H32 M12 55 ft lbs 75 Nm CR H CRN H 45 64 90 M16 74 ft lbs 100 Nm Allen Screw Seal Carrier 46 ft lbs 62 Nm Allen Screw for Shaft Bearing 23 ft lbs 31 Nm Allen Set Screw for Shaft Seal 6 ft lbs 8 Nm DNA BE gt THINK gt INNOVATE gt GRUNDFOS Dismantling Procedures CR H CRN H 32 45 64 90 In the instructions below the numbers in parenthesis 7 indicate the position number of that part as it is shown on the Parts L
9. al Driver 107 O ring 106 Cup for O ring and spring 108 Spring 112 Seal Driver with Sleeve j 110b O ring WV 22 GRUNDFOS Tandem Seal Select the desired EPDM or FKM O ring Pos 107 and slide it down the seal driver sleeve until it is seated into the cup In the Exploded View the order of assembly for the rotating portion of the seal can be seen To prevent leakage it is critical to position the rotating Seal Face Pos 104 correctly Sow If it was not already done remove the Stationary Seal Pos 103 and O ring Pos 102 Use Punch 0OSV0015 and a rubber mallet Fit the floating driver Pos 111 onto the O ring Make sure the tabs are facing downward and then engage with the tags of lower driver With the tapered face pointing downward install the Rotating Seal Pos 104 Tapered face should pass through the driver 111 and should press against the O ring Pos 107 Place the desired EPDM or FKM O ring Pos 102 onto the new Stationary Seal Pos 103 Reassembly Procedures CR H CRN H 32 4564 90 Spray soapy water onto the o ring and seal the insert Fully seat these items into the Tandem Seal Housing Pos 77a Clean the polished surface with an alcohol wipe swab Tandem Seal continued Place the rotating seal assembly onto Punch O00SV0015 Before lowering the tandem flush seal housing make sure the tabs of the drivers are positioned correct
10. ar 3 Worn groove to Impeller Wear Ring Pos 49c from system sediments Wear rings should be replaced or impeller complete if threaded area for split cone nut is damaged Shaft 51 Should show no signs of gouging or wear throughout its total length If reusing the shaft use a light grit emery cloth to smooth away sharp edges made by the shaft seal set screws Stack Compression Spacer 60 Should always be replaced Shaft Seal Cartridge Cpl 105 a b amp c Should seal without leakage Refer to the Parts List and Kits section for a list of material numbers and spare part kits WV 12 GRUNDFOS Reassembly Procedures CR H CRN H 32 45 64 90 To reinstall the Chamber Bearing Ring Pos 47 or Bearing Sleeve Pos 47c and Bearing Lock Ring Pos 47d or47e place the chamber in a downward position Depending on the type of Chamber used Pos 3 4a or 4 place the appropriate components Pos 47 or 47c and Pos 47d or 47e onto the chamber Position the reduced diameter end of the punch through the components Use arubber mallet to drive in place Before reusing the Shaft Pos 51 use an emery tool to smooth away shaft seal set screw marks and make sure the main shaft area is not worn Ifthe Journal Bearing Pos 47b was removed replace the journal bear ing Add the Clamping Washer Pos 66 and two Locking Washers Pos 66b Loosely thread the 6mm Allen Screw Pos 67 onto the shaft To ensure journal bearing and
11. around one of the seal holder allen screws Check rotation by turning the coupling by hand If the shaft Remove the adjusting fork is tight or will not rotate disassemble Fit Coupling Guard Pos 7 over screws Pos 7a Torque to 6 ft lbs 8Nm and begin the assembly procedure again Tandem Seal Fit the coupling guard and Remove the adjusting forks For storage place the adjusting Install system piping to forks around two of the seal the tandem seal housing screws Torque screws to retaining screws Check rotation 6 ft Ibs 8Nm by turning the coupling by hand If the shaft is tight or will not rotate disassemble and begin the assembly procedure again If the discharge adapter flange was removed follow the steps in the gray boxed area on the next page Mw GRUNDFOS 2 4 25 Reassembly Procedures CR H CRN H 32 45 64 90 If the Discharge Adaptor Flange and O ring have been removed replace following the next steps Apply Dow Corning 111 or Rocol to groove in Flange Pos 12a Align flange position to locate Flange 1 4 Pipe Plug Lamm i Pos 201 Pos 23b o o in on adaptor Diagonally Place Retaining torque Allen Ring Pos 203 Screws Pos 35 PETES in groove to 15 ft lbs 20 D S Attach system Nm Make sure PEPPE gasket flange flange is fully a and piping seated without a any gaps 7 THE PUMP IS NOW COMPLETELY REASSEMBLED Return the pump to the s
12. change coupling components they are a matched set Use two flat slot blade screwdrivers to pry the seal loose Slide the seal Pos 105 completely off the shaft Pos 51 Forseal change on Standard and Cool Top pumps only go to the Reassembly section step 54 For STACK Pos 80 replacement Back to Back Inboard Seal Pos 105b and Cool Top Connecting Pipe Pos 149 removal continue with step 9 Dismantling Procedures CR H CRN H 32 45 64 90 Pos 105 TE II H Ii bill Cartridge Seals Will lift out as a complete assembly All models requiring full dismantling for STACK Pos 80 replacement Loosen but do not remove the 24 mm Staybolt Nuts Pos 36 Then proceed to Dismantling step 40 For Back to Back inboard seal change continue by first placing blocking under the staybolts Then remove the Staybolt Nuts Washers Pos 66a and Support Plate Pos 90c To remove the Inboard Shaft Seal Pos 105b loosen but do not remove the two 3mm Set screws Pos 113a in the Seal Driver Pos 112 Slide the seal driver off of the shaft To remove the motor stool Pos 1a and motor If needed place a block under the Support Bracket Pos 90c Loosen and remove the Allen Screws Pos 28 connecting the motor stool to the pump head Leave the motor stool attached to the motor and or bearing flange to protect the motor shaft and bearing flange shaft Loosen the Slide Rail Pos 90d conne
13. cting the motor to the Base Pos 90 then slide the motor backward on the base If sliding provisions are not available on the base or when working on Cool Top and Back to Back models use a lifting device to lift and remove the motor assembly ORA ess Remove the outermost Pump Head Pos 2b This may require light blows with rubber mallet to the underside of the pump head Remove the Spring Pos 108b and Spring O ring Cup Pos 106b To remove the Outer Sleeve Pos 55a diagonally grip the Staybolts Pos 26 Use your thumbs to press against the sleeve to release the sleeve from the middle pump head If it does not move freely light blows with a rubber mallet may be required Once loose remove the sleeve Remove O ring Pos 107b and Seal Driver Pos 111b DNA GRUNDFOS 24 3 Dismantling Procedures CR H CRN H 32 45 64 90 Back to B Remove the Rotating Seal Face Pos 104b Then use adjustable pliers or a 53 mm 2 1 8 in wrench to remove the Threaded Seal Retainer Pos 148 Slide remove the middle pump head Pos 20 Remove the Connecting Pipe Pos 149 and the innermost Pump Head Pos 2 Mw 4 GRUNDFOS s Slide the threaded seal retainer off the shaft Next slide the Retaining Washer Pos 59e off the shaft Place the connecting pipe into one of the pump heads Use 00SV2128 and a rubber mallet to drive out the Retainer Ring Pos 47h and Bushings
14. e O rings with Rocol or Dow Corning 111 Lower and seat the Retainer Pos 58c for the connecting pipe Lubricate the threads of the 8 mm hex socket Retaining Screws Pos 58d with Gardolube 00SV9995 or Thread Eze 96611372 Install and diagonally torque the screws to 46ft lbs 62Nm If the uppermost Pump Head Pos 2b upper Sleeve Pos 55a and middle Pump Head Pos 2c did not leak and were removed as a complete assembly then lower it back in place as a complete assembly and skip to reassembly step 46 If the assembly leaked and was fully dismantled continue with step 24 DNA 16 GRUNDFOS 2 Slide the completed connecting pipe assembly down over the shaft and firmly seat it into the lowermost Pump Head Pos 2 Place the Spacing Ring Pos 116 onto the pump head O rings of EPDM or FKM should have already been installed into the pump heads as noted in Reassembly step 14 If they were not install them now Then lower the middle pump head and carefully press it over the connecting pipe O ring and seat it on the spacing ring Install the upper sleeve and firmly press it in place Put the uppermost pump head in place making sure it is firmly seated Skip to reassembly step 46 Use 00S8V2128 and a rubber mallet to drive in three new Bushings Pos 47g and the Retainer Ring Pos 47h into the Connecting Pipe Pos 149 Lower the Retainer Pos 58c over the connecting pipe Lubricate the threads of the 8
15. e staging sequence Fit the Base Interface Assembly Pos 44 or 44a onto the assembly disassembly fixture Be sure to use the appropriate spacing plate that fits snugly to the bottom of the base interface Using the incorrect spacing plate can lead to rotation and end play problems End play is shaft travel up and down through the chambers Place Gardolube 00SV9995 or equivalent FDA approved non toxic lubricant on the threaded area of the hub Thread the Split Cone Nut Pos 48 onto the impeller Using the split cone nut tool 00SV0004 Adapter 00SV0403 and Torque Wrench 00SV0269 torque the split cone nut to 52 ft lbs 70 Nm DNA GRUNDFOS 2 13 Reassembly Procedures CR H CRN H 32 45 64 90 Refer to the diagrams on pages 27 30 forthe appropriate staging sequence for your particular model pump Once the last chamber has been installed continue with step 9 To install the Bottom Bearing Pos 6g into the Sleeve Flange Pos 55b place the bearing into the hole provided in the flange Ensure the recessed area of the bearng is located where the hole for the allen screw is machined in the flange Use the appropriate sleeve flange O ring material for the application Standard units EPDM or FKM Pos 37 Exoticand or fluid with temperatures over 250 F use FXM or FFKM Pos 37a Place the sleeve o rings into the recessed groove in the Pump Head Pos 2 2b amp 2c and the sleeve flange In C
16. ews to 46ft lbs 62Nm To install the Coupling Halves Pos 10a position the coupling half relief area flushed with the top of the shaft as shown in the diagram Lubricate the threads on the 8 mm hex socket Coupling Screws Pos 9 with Gardolube or Thread Eze Loosely thread the screws in place Torque the 8 mm hex socket coupling screws to 63 ft lbs 85 Nm This step is the same for all pump types in the photoa tandem seal version is shown WV 24 GRUNDFOS s oo Push the shaft inward for Back to Back units continue inward pressure as the inboard seal spring tension may push the shaft out Evenly tighten then torque the three 3 mm set screws to 6 ft lbs 8Nm Make sure the gaps on both sides of the coupling are even Applies to all pump types ia l gt w 3 5 j F g a f q rinks y 2 3 aa j ern al 4 z y ee in mp ik d ke al A Gee 4 a e R k e 5 n a y une a _ w A a z Pull the shaft outward and insert the adjusting fork under the seal collar Tandem Seal Only R AT a ENTREE Place a second adjusting fork on top of the seal collar Install the Coupling Halves Pos 10a Lubricate the threads on the 8 mm hex socket Coupling Screws Pos 9 with Gardolube or Thread Eze Loosely thread the screws in place Reassembly Procedures CR H CRN H 32 45 64 90 Standard Cool Top amp Back to Back Seal Units For storage place the adjusting fork
17. g Pos 102 O Ring Press the stationary seal assembly into the connecting pipe Clean the polished seal face surface with an alcohol wipe Use special tool 00SV7902 to tighten the nut The underlined text for steps 38 to 45 depends if the unit is still attached horizontally in the system or is standing vertical as a cartridge assembly If vertical lower if horizontal slide WV 18 GRUNDFOS Lubricate the inner surface of the connecting pipe with Rocol Dow Corning 111 or soapy water Lubricate the threads with Gardolube or an equivalent FDA approved non toxic lubricant Place the Retaining Washer Pos 59a onto the seal When reusing an existing shaft first clean any set screw marks off the shaft with a light grit emery cloth Next lift the complete assembly lowermost pump head spacing ring middle pump head and complete stationary seal by the lowermost pump head Position the Priming Vent Plug Pos 18 on the lowermost pump head so it is pointing upward or is in line with the venting label and flat surface of the sleeve flange Carefully lower the assembly down the shaft and staybolts Firmly seat the assembly in place onto the sleeve Lower and press the completed stationary seal assembly into the connecting pipe Loosely thread the Securing Nut Pos 148 onto the connecting pipe The order of assembly for the rotating portion of the seal can be seen on the next page To prevent leakage i
18. gister in the base see diagram at the right Repair before proceeding If properly seated apply Gardolube or Thread eze to the screws then torque diagonally as follows CR H 32 55 ft lbs 75 Nm CR H 45 64 90 74 ft lbs 100Nm WV 20 GRUNDFOS 24 Align the cartridge and slide itintothe suction discharge base making sure that the O ring from step 47 is still in place Also make sure the sleeve flange flat surface venting label and vent plug are facing upward Reassembly Procedures CR H CRN H 32 45 64 90 If the motor was removed during disassembly reattach the motor Lubricate the threads of the Motor Bolts Pos 28a and then tighten the bolts diagonally to 30 ft lbs 41 Nm for 1 2 x 13 UNC 3 40 HP 59 ft lbs 80 Nm for 5 8 x 11 UNC 50 60 HP Slide the motor and Motor Stool Pos 1a assembly down to the Pump Head Pos 2 Slightly liftng the cartridge may be required to allow the motor stool register to fully seat to the pump head Tighten the Slide Rail Screws Pos 90d connecting the motor to the base plate Push the shaft all the way in then evenly tighten and torque the three 3 mm set screws to 6 ft lbs 8 Nm Lubricate the threads on the 8 mm hex socket Retaining Screws Pos 28 with Gardolube or Thread Eze Install and hand tighten all four Allen Screws connecting the motor stool to pump head If the holes do not line up grab and twist the cartridge by the staybolts then
19. gs Pos 37 from the pump head and the sleeve flange To remove outer sleeve Pos 55 grip staybolts diagonally Using your thumbs press against sleeve to release the sleeve from the sleeve flange light blows with a rubber mallet may be required Once the sleeve is loose slide remove it WV 8 GRUNDFOS 2 Dismantling Procedures CR H CRN H 32 45 64 90 Remove the four STACK Compression Spacers Pos 60 Fit assembly disassembly tool 00SV0003 to Stack The tool consists of different size spacing plates Select the plate which fits securely to the Stack Interface Pos 44 Place holding pin into the disassembly hole To remove the Bottom Bearing Pos 6g loosen and remove the 5 mm Hex Socket Allen Screw Pos 31 and Washer Pos 32 from the Sleeve Flange Pos 55b Using the Bearing Puller 00SV0002 and M8 x 50 mm Allen Screw 001D6595 insert the bearing puller along with the allen screw at an angle until it passes through the bearing Once the bearing puller is under the bearing s lower edge turn the 6 mm hex socket allen screw until the bearing has been pryed out of the housing For STACK replacement proceed to Reassembly step 11 For STACK Dismantling continue with step 59 Loosen the chamber straps remove Remove the Upper Chamber Pos 3 6 mm hex socket Allen Screw Pos 26b Washer Pos 26c and Chamber Straps Pos 26a Loosen Split Cone Nut Pos 48 approximately two to three full tu
20. ist and Kits diagram These instructions cover the repair of the pump after it has been isolated from the system Before removing the pump from the system make sure all valves are closed Relieve any built up pressure by opening the vent plug screw The power source should be turned off and locked out before starting any work Removal of field wiring to the motor may be required Color coding or numbering the wires will aid in reinstallation Use an Allen wrench with an 8 mm tip to loosen and remove the Coupling Screws Pos 9 from the Coupling Halves Pos 10a Remove the 8 mm socket Allen Screws Pos 58a from the Seal Retainer Pos 58 Remove the retainer Mw 2 GRUNDFOS 2 Se For shaft seal change only Standard unit or a Cool Top follow steps 1 to 7 Pumps built with Back to Back seals follow steps 1 to 10 Pumps built with Tandem Quench seals follow steps 25 to 39 To remove the coupling halves insert a flat slot blade screwdriver in the coupling gap and twist to free the first coupling half Be 2 Loosen but do not remove the 3 mm Set Screws Pos 113 from the Shaft Seal Pos 105 Loosen but do not remove Coupling Guard Screws Pos 7a Remove Coupling Guards Pos 7 from the Motor Stool Pos 1a Tofree removethe remaining coupling half nearest the motor shaft strike the edge of the coupling half with a rubber mallet Note If you have multiple pumps do not inter
21. leeve Pos 55 into the sleeve flange Line up venting sticker with flat surface of sleeve flange This will ensure the lubrication BIG hole is pointed ee p L o Before starting ownward when assembled Press sleeve ad firmly in place d _ This may require gentle taps with a rubber mallet Reassembly Procedures CR H CRN H 32 45 64 90 Replace the four PTFE Stack Compression Spacers Pos 60 into the Pump Head Pos 2 which will seat against the stack Lubricate the inner bore of the pump head or all pump heads for Cool Top or Back to Back seal equipped pumps with Rocol OORM 2924 or Dow Corning 111 For Standard Cool Top and Tandem equipped pumps position and lower the completed pump head over the Staybolts Pos 26 Make sure the vent plug Pos 18 is located in line with the vent sticker and the flat surface of the sleeve flange Use a rubber mallet to firmly seat the pump head For Standard and Tandem equipped seal pumps skip to reassembly step 46 For Cool Top units continue with Reassembly steps 18 to 24 Mw GRUNDFOS 24 15 Reassembly Procedures CR H CRN H 32 45 64 90 Use 00S8V2128 and a rubber mallet to drive in three new Bushings Pos 47g and the Retainer Ring Pos 47h into the Connecting Pipe Pos 149 Cool Top K Replace the O rings Pos 109a amp 109b Do not roll the O ring into place stretch and release them into the grooves Then lubricate th
22. mm hex socket Retaining Screws Pos 58d with Gardolube 00SV9995 orThread Eze 96611372 Install and diagonally torque to 46ft Ibs 62Nm Back to Back Seal Replace the O rings Pos 109a amp 109b Do not roll the O ring into place stretch and release them into the grooves Then lubricate the O rings with Rocol or Dow Corning 111 Place the Spacing Ring Pos 116 onto the pump head Reassembly Procedures CR H CRN H 32 45 64 90 Place and fully seat the complete connecting pipe assembly into the lowermost Pump Head Pos 2 which has the PTFE stack compression Spacers Lower the middle Pump Head Pos 2c over and past the connecting pipe threads and upper O ring The pump head should rest on top of the spacing ring Assemble the stationary seal by placing the O ring Pos 102 over the Retainer Pos 103a Place the O ring Pos 102a into the retainer recess Lubricate spray a 5 solution of soapy water onto the O ring resting in the retainer recess Align edges of the Stationary Seal Pos 103 with the retainer and firmly press the stationary seal into O ring Stationary seal components can be seen in the diagram on the next page LO GRUNDFOS 4 17 Reassembly Procedures CR H CRN H 32 45 64 90 Back to Back Seal continued COMPONENTS OF STATIONARY SEAL N PUMPS AND MODEL B Pos 103 Upper Seal Side View Ring Pos 102a O Ring Pos 103a Retainer For Upper Side View Seal Rin
23. not remove the24mm Staybolt Nuts Pos 36 and Washers Pos 66a Proceed to Dismantling step 40 Dismantling Procedures CR H CRN H 32 45 64 90 Loosen and remove all the Sleeve Flange Nuts Pos 56e Allen Screws Pos 56c and Washers Pos 56d from the Sleeve Flange Pos 55b Move the cartridge assembly to a workbench Lay horizontal then finish removing the Staybolt Nuts Pos 36 Washers Pos 66a and Support Plate Pos 90c For Standard units skip to step 53 For Cool Top continue with step 44 y z a A lt y w aa Remove the plastic plugs from the threaded jacking holes Next usetwo of the sleeve flange allen screws and place into the threaded holes of the sleeve flange Tightened diagonally this will force the cartridge assembly Pos 80a away from the Suction Discharge Base Pos 6 Warning Do not allow the cartridge assembly to fall Remove the outermost Pump Head Pos 2b Outer Sleeve Pos 55a and middle Pump Head Pos 2c as a complete assembly if it has not leaked then skip to step 48 If the assembly has leaked follow steps 45 to 47 To remove the cartridge assembly from the Suction Discharge Base grab the two top staybolts and slide outward some rocking movement may be required Warning Cartridge assemblies are heavy a lifting device may be required ee i e ae Remove the outermost pump head This may require light blows with rubbe
24. ool Top equipped pumps the lower hot section of the pump pump head Pos 2 and the sleeve flange should have FXM or FFKM o rings For all material types never use oil or grease on the o rings lubricate the o rings with Rocol OORM2924 or Dow Corning 111 Mw 14 GRUNDFOS Hook the Chamber Straps Pos 26a through the Base Interface Pos 44 Position top end of straps into relieved area of the Top Chamber Pos 3 Place the Washer Pos 26c and 6 mm hex socket Allen Screws Pos 26b loosely threaded into the straps Allen screws must be pre lubricated with Gardolube Torque evenly to 11 ft lbs 15 Nm Use the Bearing Punch 00SV0015 and a rubber mallet to gently drive the bearing into place Place the STACK Assembly Pos 80 into the sleeve flange Rotate straps so they are centered between the Staybolts Pos 26 Support blocks like 2x4 material may need to be used under the sleeve flange to prevent toppling 16 EDA CAUTION Remove the holding pin from the assembly dismantling fixture Lift the STACK Pos 80 out of the fixture Lay the stack on a flat surface and check the rotation and end play Movement should be free and without binding End play is shaft travel up and down through the chambers Place the Washer Pos 32 and 5 mm hex socket Allen Screw Pos 31 into the suction discharge base Tighten down against the bearing to hold in place Torque to 6 ft lbs 8 Nm Place S
25. r If the Impeller Wear Ring Pos 49c is worn and the split cone nut impeller hub threads are not damaged the wear ring may be removed using the appropriate support tool e CR H CRN H 32 OOSV0043 e CR H CRN H 45 OOSV0044 e CR H CRN H 64 OOSV0045 e CR H CRN H 90 OOSV0046 along with the wear ring puller 00SV0239 used to pry off the wear ring If the threads of the impeller hub are damaged a new impeller will be required Dismantling Procedures CR H CRN H 32 45 64 90 If the Discharge Adaptor Flange 12a has leaked the O ring may need replacement To remove follow the next steps after removing the system discharge piping P Z S PAN pa trima nee M r 15 t m 3 Pees eee Ss a WEE po oe Push the Flange Ring Pos 201 down Remove the Flange Allen Screws use a screwdriver to remove the Pos 35 Retaining Ring Pos 203 then remove the flange ring THE PUMP IS NOW COMPLETELY DISASSEMBLED Mw GRUNDFOS 4 11 Dismantling Procedures CR H CRN H 32 45 64 90 When Should A Part Be Replaced Part Position s Minimum Operating Condition Pump Head 2 Excessive pitting of these castings could cause leaks Rusted castings should have all seating areas cleaned to ensure proper seating of O rings Suction Discharge 6 Base Chambers 3 4a 4 Same as for impellers O rings 37 38 38a 100 Should be soft and pliable with no visible scars Since they are easily damaged
26. r mallet to the underside of the pump head Cool Top A War p ma 3 i f Mi O Slide remove the middle pump head Pos 2c To remove the outer sleeve diagonally grip the Staybolts Pos 26 Using your thumbs press against the sleeve to releasethesleevefromthemiddle pump head If it does not move freely light blows with a rubber mallet might be required Once loose slidethesleeve off Remove the Spacing Ring Pos 116 DNA GRUNDFOS 24 7 Dismantling Procedures CR H CRN H 32 045 64 90 Oa Loosen and remove the 8 mm hex socket Retainer Screws Pos 58d Remove the Connecting Pipe Retainer Pos 58c Remove the O rings Pos 109a and 109b For reassembly of the connecting pipe go to the Reassembly section step 18 To continue disassembly proceed to step 53 ON A A Remove the Connecting Pipe Pos 149 ALL UNITS Remove Pump Head Pos 2 by pushing away from sleeve this may require light tapping with a rubber mallet to the underside of the pump head to loosen Once pump head is loose slide away from cartridge D a N Place the connecting pipe into one of the pump heads Use 00SV2128 and a rubber mallet to drive out the Retainer Ring Pos 47h and Bushings Pos 47g Remove the Stack Pos 80 from the remainder of the assembly For STACK dismantling go to step 59 assembly End of Cool Top specific instructions Using a small screwdriver remove Sleeve O rin
27. rns with split cone Remove Base Interface Pos 44 nut wrench 00SV0004 Flip tool over and give a sharp blow directly down against the split cone nut This will loosen the Split Cone Pos 49b and allow the Impeller Pos 49a to be lifted off the shaft Lift off Chambers Pos 4 amp 4a Repeat this process until all impellers are removed from Shaft Pos 51 Mw GRUNDFOS 9 Dismantling Procedures CR H CRN H 32 45 64 90 To remove the shaft from the assembly disassembly tool remove the holding pin from the shaft and lift shaft out of tool After inspecting the parts if further disassembly is required proceed to the next steps Depending on wear the Neck Ring Pos 45 Retainer Pos 65 and Holder Pos 45a may need to be removed Using a flat bar pry these components out of the chambers and base interface as a complete assembly To remove the Chamber Bearing Pos 47 Bearing Sleeve Pos 47c and Bearing Lock Ring Pos 47d place chamber upward using the punch 00SV0015 Drive the bearing downward WV 10 GRUNDFOS Remove bearing from shaft Remove 6 mmhexsocket Allen Screw Pos 67 Locking Washer Pos 66b Washer Pos 66 and Journal Bearing Pos 47b Loosening the allen screw may require use of the holding pin as a countering device so the shaft does not spin If wear or damage is minor the neck ring may be replaced using a screwdriver to twist and pry out the retaine
28. s remove the motor to pump Bolts Pos 28a Remove motor off of Motor Stool Pos 1a Use two flat slot blade screwdrivers to pry the seal loose Slide the Seal Pos 105c completely off of the Shaft Pos 51 Once removed fully unscrew the set screws Pos 113 and 105c can be completely disassembled see exploded view on page 6 Mw GRUNDFOS 7 5 Dismantling Procedures CR H CRN H 32 45 64 90 Tandem Seal continued 112a Seal Driver Ring 113 i Set Screw Remove the Tandem Seal Housing O ring Pos 109c 77a Seal Housing 109c O ring for Seal Housing O 102 Upper O ring Stationary Seal Face CO P 104 Use two flat slot blade screwdrivers The tapered face See to pry the seal loose Lift the seal should point completely off the shaft For seal downward 111 change only go to the Reassembly through the l 8 Floating section step 54 To continue WS 2 f driver 111 and Seal Driver i press against the y disassembly proceed to step 38 O ring 107 107 O ring Cup for O ring and spring we 38 Spring 112 Seal Driver with Sleeve 110b O ring Loosen and remove the 8 mm hex socket Allen Screws Pos 28 connecting the motor stool to Pump Head Pos 2 NA 6 GRUNDFOS 2 Loosen but do not remove the 3 mm Set Screws Pos 113 from the Shaft Seal Pos 105 Pos 105 Cartridge Seals Will lift out as a complete assembly Loosen butdo
29. t is critical to position the rotating seal face correctly Reassembly Procedures CR H CRN H 32 45 64 90 Back to Back Seal continued COMPONENTS OF ROTATING SEAL LOWER COMPONENTS OF SEAL ASSEMBLY 00 W A l 7 Pos 112 Seal Driver with set screws Pos 113 Pos 106 Cup for O ring and Spring Pos 111 Floating Seal Driver Pos 104 Rotating Seal Face The tapered face should point outward upward through the driver 111 and press against the O ring aa Slide lower the Driver Pos 112 with set screws Pos 113 Driving tabs should pass and engage each other With the shaft and the seal drivers pushed down inward as far as possible tighten the 3mm Set Screws Pos 113 to 10ft lbs 13Nm With the tapered edge facing upward outward slide lower the Rotating Seal Face Pos 104 down onto the stationary seal face Note Upward if vertical Outward if horizontal Lubricate the inner surface of the O ring Pos 107 with Rocol Dow Corning 111 or soapy water Slide the O ring down the shaft until it contacts both the driver and the protruding surface of rotating seal face Slide lower and seat the upper Sleeve Pos 55a intothe middle pump head Slide lower the Floating Seal Driver Pos 111 until it fully engages the rotating seal face Ensure the taper of the rotating seal protrudes through driver Slide lower the Cup Pos 106 over the O ring Lower the Spring
30. ystem and install it following the Installation and Operation instructions If the unit was not removed from the system open the isolation valves in the system piping to fully vent the pump Confirm proper electrical connections before restoring power supply 26 GRUNDFOS 24 Reassembly Procedures CR H CRN H 32 45 64 90 CR H CRN H 32 Order of Stage Assembly 7 6 5 4 3 2 1 Low NPSH E Combination Replacement o Start for Low NPSH order E A ae a 13 Le 12 11 Ce ae eo 10 9 e 8 7 i 6 e 6 5 4 3 2 Low NPSH 2 Combination Replacement naa PSH units start with 2 1 and continue For Low NPSH For Low NPSH to the 14 stage replace the first replace 44 49e with 49i with 44a NOTE Refer to Parts List for ALL position TA descriptions DNA GRUNDFOS 2 27 Reassembly Procedures CR H CRN H 32 45 64 90 FN OMOOMOrRON STON q H 45 Start for Low NPSH order 9 CR H CRN Order of Stage Assembly Low NPSH Combination Replacement Low NPSH Combination Replacement with 44a gt lt Nn oO Zo 2 0 33 o LL 49e with 49i a t TE kE oo Z eB e oo wu O Low NPSH units start with 2 1 and continue to the 10 stage NOTE Refer to Parts List for ALL position descriptions 28 GRUNDFOS s Reassembly Procedures CR H CRN H 32 45 64 90 CR H CRN H 64

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