"service manual"
Contents
1. the Tandem Shaft Seal Pos 105c Dismantling Procedures CR CRN 32 45 64 90 Tandem Seal Remove system flush piping 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 58b 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 Regardless of the motor HP size on Tandem Seal equipped pumps the motor must be removed to change the seals Remove the motor to pump bolts Pos 28a Lift motor off of motor stool Pos 1a Use two flat slot blade screwdrivers to pry the seal loose Lift the seal Pos 105c completely off of the shaft Pos 51 GRUNDFOS X 7 Dismantling Procedures CR CRN 32 45e64 90 Remove the Tandem Seal Housing O ring Pos 109c Pos 105 Cartridge Seals Will lift out as a complete assembly 8 GRUNDFOS X Tandem Seal continued Loosen but do not remove the 3 mm Set Screws Pos 113 from the Shaft Seal Pos 105 Loosen and remove the 8 mm hex socket Allen Screws Pos 28 connecting the motor stool to Pump Head Pos 2 Use two flat slot blade screwdrivers to pry the seal loose Lift the seal completely off the shaft For seal change only go2. 148 a the Retaining Washer Pos Remove the lower most Pump Head Pos 2 Spacing Ring Pos 116 and middle Pump Head Pos 2c with Connecting Pipe Pos 149 as an assembly Light upward blows with rubber mallet to the underside of the lower most pump head might be required GRUNDFOS Dismantling Procedures CR CRN 32 45 64 90 Back to Back Seal continued Use your finger to reach through Remove the middle pump head and spacing ring the center of the seal then pull the Stationary Seal from the connecting pipe Use 00SV2128 and a rubber mallet to drive out the Retainer Ring Pos 47h and Bushings Pos 47g Use an 8 mm Allen wrench to loosen and remove the Retainer Screw Pos 58d Then remove the Connecting Pipe Retainer Pos 58c Remove the connecting pipe Remove the O rings Pos 109a and 109b Flipthepumpheadoverandremovethe four Stack Compression Spacers Pos 60 For reassembly of the inboard seal skip to the Reassembly Section step 25 To continue disassembly proceed to dismantling step 51 6 GRUNDFOS X 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 a flat slot blade screwdriver in the coupling gap andtwisttofreethe first coupling half S Be Loosen but do not remove the 3 mm Set Screws Pos 113 from
3. For all models except Back to Back units Lower the pump head over the Staybolts Pos 26 Use a rubber mallet to firmly seat the pump head in place Make sure the Priming Vent Plug Pos 18 is inline over the discharge port of the suction discharge base For Standard and Tandem equipped seal pumps skip to reassembly step 46 For Cool Top units continue with Reassembly steps 18 to 25 For Back to Back units skip to Reassembly steps 26 to 46 GRUNDFOS Reassembly Procedures CR CRN 32 45 6490 Use 00SV2128 and a rubber mallet to drive in three new Bushings Pos 47g and the Retainer Ring Pos 47h intothe Connecting Pipe Pos 149 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 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 16 GRUNDFOS X Slide the completed connecting pipe assembly dow
4. GRUNDFOS CR SERVICE MANUAL CR CRN 32 45 64 90 Dismantling amp Reassembly CONTENTS Dismantling Procedures When Should A Part Be Replaced 2 00 0 eeesseceeeseees Page 12 Reassembly Procedures Setting The Coupling Height Order of Stage Assembly CR CRN 32 Order of Stage Assembly CR CRN 45 Order of Stage Assembly CR CRN 64 Order of Stage Assembly CR CRN 90 TORQUES Position Number Ta Screw for Guard 6 ft lbs 8 Nm 9 Coupling Screws 63 ft lbs 85 Nm 26b Allen Screw for Strap 11 ft Ibs 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 Bottom Stationary Bearing 6 ft lbs 8 Nm Staybolt Nut 74 ft lbs 100 Nm Split Cone Nut 52 ft lbs 70 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 innovate GRUNDFOS X Dismantling Procedures CR CRN 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 List 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 an
5. 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 NOTE Refer to Parts List for ALL position ae descriptions with 44a gt lt GRUNDFOS 25 be think innovate CR CRN 90 Order of Stage Assembly Combination Replacement Start for Low NPSH order ee Se NUAN Combination Replacement Low NPSH units start with 2 1 and continue For Low NPSH to the 6 stage ja replace 44 with 44a gt lt For Low NPSH replace the first si dik 4 ith 49i NOTE Refer to Parts List for ALL position descriptions 2eWIEn 49 L CR SM 010 0410 The name Grundfos the Grundfos logo and be think innovate are registered trademarks owned by Grundfos Holding A S Denmark All rights reserved worldwide Copyright Grundfos Holding A S GRUNDFOS Pumps Corporation GRUNDFOS Canada Inc Bombas GRUNDFOS de Mexico S A de CV 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 V www grundfos us fae SA BLAA ANO G n U N D FOS 4A
6. ar 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 interfaceassembly Slidethe Split Cone Pos 49b down the shaft and into the recessed area of the impeller hub Use the split cone nut tool OOSVO004 in the inverted direction andfirmly drive split coneintothe impeller While performing this function care must be taken to avoid damaging the threaded hub area of the impeller Reassembly Procedures CR CRN 32 045 64 90 To reinstall the Neck Ring Pos 45 the Neck Ring Retainer Pos 65 or complete Neck Ring Assembly Pos 45a place these components intothe Chamber Pos 4 or 4a or Base Interface Pos 44 Position the appropriate neck ring punch eCR CRN 32 OOSVOO025 eCR CRN 45 OOSVOO027 CR CRN 64 OOSV0028 eCR CRN 90 OOSVO029 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 22 26 for the appropriate staging sequence Fitthe Base Interface Assembly Pos 44 or44a ontotheassembly disassembly fixture Besure 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 tr
7. avel 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 OOSV0004 Adapter 00SV0403 and Torque Wrench OOSV0269 torque the split cone nut to 52 ft Ilbs 70 Nm GRUNDFOS X 13 Reassembly Procedures CR CRN 32 45e64e90 Refer to the diagrams on pages 22 26 for the 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 Suction Discharge Base Pos 6 place the bearing into the hole provided in the base Ensure the recessed area of the bearing is located where the hole for the allen screw is machined in the base Place the Sleeve O ring of EPDM or FKM Pos 37 into the recessed groove in the Pump Head Pos 2 2b amp 2c and the suction discharge base for standard units Specialty O rings in FXM or FFKM Pos 37a are used in the lower hot section of the pump in Cool Top equipped pumps Lubricate the O rings with Rocol OORM2924 or Dow Corning 111 Never use oil or grease as this will attack the O rings 4 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 Allen Screws Pos 26
8. b 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 OOSVOO15 or 0OSVO212 and a rubber mallet to drive the bearing into place Place the STACK into the suction discharge base Rotate thestrapssothey center between the Staybolts Pos 26 or line up with the suction and discharge ports of the base Recheck the shaft end play shaft travel up anddown andtheshaft rotation Movement should be free without binding If binding occurs stop remove the stack and check clearance between the bottom shaft bearing bearing clamping washer andthe bearing in the base 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 the 5 mm Allen Screw Pos 31 into the suction discharge base Torque the screw to 6ft lbs 8Nm Place Sleeve Pos 55 into the suction discharge base Press sleeve firmly into the base Reassembly Procedures CR CRN 32 45 64e90 Replace the four PTFE Stack Compression Spacers Pos 60 in the pump head 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
9. bricate the threads of the Motor Bolts Pos 28a and tighten the bolts diagonally to 30 ft lbs 41Nm Standard Cool Top amp Back to Back Seal Units ei ae Se Ey ae ES bi 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 ALL PUMP TYPES Placement of the i Motor Stool Pos 1a differs depending on model size paren wt b LA Vy iiin pN Push the shaft downward for Back to Back units continue downward pressure as the inboard seal spring tension may lift the shaft Evenly tighten then torque the three 3 mm set screws to 6 ft lbs 8Nm eS 3 ACAN ste The motor motor stool and or bearing flange will be assembled as a complete unit Place the entire assembly onto the pump head Lubricate the threads onthe 8 mm hexsocket Retaining Screws Pos 28 with Gardolube or Thread Eze Install and diagonally torque to 46ft lbs 62Nm If the motor was removed during disassembly reattach the motor Lubricate the threads of the Motor Bolts Pos 28a andthentighten the bolts diagonally to 30 ft Ibs 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 screws to 63 ft lbs 85Nm This step is the same for all
10. d 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 Motor to Pump Bolts Pos 28a Lift the motor off the pump 15 HP and UP Motor removal is not necessary Skip to step 6 2 GRUNDFOS For shaft seal change only on a Standard unit or a Cool Top follow steps 1 to 8 Pumps built with Back to Back seals follow steps 1 to 11 Pumps built with Tandem Quench seals follow steps 35 to 49 To remove the coupling halves insert a flat slot blade screwdriver in the coupling gap and twist to free the first coupling half kai Remove the 8 mm socket Allen Screws Pos 58a from the Seal Retainer Pos 58 Remove the retainer Loosen but do not remove Coupling Guard Screws Pos 7a Remove Coupling Guards Pos 7 from the Motor Stool Pos 1a To free remove the remaining cou pling 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 but do not remove the 3 mm Set Screws Pos 113 from the Shaft Seal Pos 105 Dismantling Procedures CR CRN 32 45 64 90 Pos 105 il MDU Use two flat slot blade screwdrivers to pry the sea
11. er 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 GRUNDFOS X 17 Reassembly Procedures CR CRN 32 45 64e90 COMPONENTS OF STATIONARY SEAL N PUMPS AND MODEL B Pos 103 Upper Seal Ring Pos 102a O Ring Pos 103a Retainer For Upper Side View Seal Ring Side View 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 OOSV7902 to tighten the nut 18 GRUNDFOs Back to Back Seal continued Lubricate the inner surface of the connecting pipe with Rocol Dow Corning111 orsoapywater Lubricatethe threadswithGardolubeoranequivalent 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 before proceeding with the next step Then lift the complete assembly lowermost pump head spaci
12. er and the protruding surfaceofrotatingsealface Pos 104 Rotating Seal Face The tapered face should point upward through the driver 111 and press against the O ring 107 g it fits over the 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 as far as possible tighten the mm Set Screws Pos 113 to 10ft lbs 13Nm Lower and firmly seat the uppermost Pump Head Pos 2b onto the upper sleeve Proceed to step 46 Lower and seat the upper Sleeve Pos 55a into the middle pump head gt 3 GRUNDFOS 19 Reassembly Procedures CR Slide the Washers Pos 66a over the Staybolts Pos 26 Lubricate the threads of the staybolts with Gardolube 00SV9995 or Thread Eze 96611372 Thread the Staybolt Nuts Pos 36 onto the staybolts Diagonallytorque the staybolt nuts to TAft lbs 1OONm Evenly tighten and then torque the three 3 mm set screws to 6 ft lbs 8Nm Lubricate the threads of the 8 mm hex socket Retaining Screws Pos 58d with Gardolube or Thread Eze Install and diagonally torque to 46ft lbs 62Nm 2 GRUNDFos CRN 32 45 64 90 When reusing an existing shaft and 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 before proceeding with the next step Apply Rocol or Dow Corning 111 to the g
13. f the pump heads Use 00SV2128 and a rubber mallet to drive out the Retainer Ring Pos 47h and Bushings Pos 47g Toremove the upper sleeve diagonally grip the Staybolts Pos 26 Using your thumbs 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 might be required Once loose liftthe sleeve off 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 goto the Reassembly section step 18 To continue disassembly proceed to step 50 Dismantling Procedures CR CRN 32 45e64 90 Back to Back Seal To remove the Inboard Shaft Seal Pos 105b loosen but do not remove the two 3mm Set screws Pos 113a in To remove the Upper Sleeve Pos SN Remove the upper most Pump Head 55a diagonally grip the Staybolts the Seal Driver Pos 2b This may require light Pos 26 Use your thumbs to press Pos 112 Lift the upward blows with rubber mallet to againstthesleeve to release the sleeve the underside of the pump head from the middle pump head If it does the shaft not move freely light blows with a _o rubber mallet might be required A Once loose lift the sleeve off seal driver off of Use specialty tool OOSV7902 to loosen and remove the threaded Seal Retainer Pos
14. ft off Chambers Pos 4 amp 4a Repeat this process until all impellers are removed from Shaft Pos 51 GRUNDFOS X 9 Dismantling Procedures CR CRN 32 45 64 90 Toremovetheshaftfromtheassembly 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 Remove bearing from shaft Remove 6 mm hex socket Allen Screw Pos 67 locking washers Pos 66b washer Pos 66 andjournalbearing Pos 47b Loosening theallen screw may require use of the holding pin as acountering device so the shaft does not spin bi A Lift out the Neck Ring Pos 45 If wear or damage is minor the neck ring may be replaced using a screw driver to twist and pry out the retainer 45 Retainer Pos 65 and Holder Pos 45a may need to be removed Using aflat bar prythesecomponentsoutofthechambers and base interface as a complete assembly 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 CRN32 e CR CRN45 e CR CRN64 e CR CRN9O OOSV0043 OOSV0044 OOSV0045 OOSV0046 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 downwa
15. l loose Lift the seal Pos 105 completely off of the shaft Pos 51 For seal change only on Standard and Cool Top pumps go to the Reassembly section step 47 For Cartridge Seals STACK Pos 80 replacement Back Will lift out as a complete assembly to Back Inboard Seal Pos 105b and Cool Top Connecting Pipe Pos 149 removal continue with step 10 15 HP and UP Loosen and remove the 8 mm hex socket To remove the Motor Stool Pos 1a Loosen and remove the 24 mm Allen Screws Pos 28 connecting the Loosen the allen screws connecting the Staybolt Nuts Pos 36 and Washers motor stool to Pump Head Pos 2 motor stool to the pump head Leave the Pos 66a For Standard pumps skip motor stool attached to the motor and or to dismantling step 50 For Cool Top bearing flange to protect the motor shaft units continue with steps 12 to 20 and bearing flange shaft For Back to Back units continue with steps 21 to 34 GRUNDFOS X 33 Dismantling Procedures CR CRN 32 45 64 90 Remove the upper most Pump Head Pos 2b Upper Sleeve Pos 55a and middle Pump Head Pos 2c as a complete assembly if it has not leaked thenskiptostep 16 Ifthe assembly has leaked follow steps 13 to 15 Remove the Connecting Pipe Pos 149 4 GRUNDFos Cool Top Remove the upper most pump head This may require light upward blows with rubber mallet to the underside of the pump head Place the connecting pipe into one o
16. n 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 00SV2128 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 ofthe8mmhexsocketRetainingScrews Pos 58d with Gardolube 00SV9995 or Thread Eze 96611372 Install and diagonally torque to 46ft lbs 62Nm Reassembly Procedures CR CRN 32 45e64e90 Back to Back Seal STREET E A SN pl 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 Once loose lift the sleeve off Place the Spacing Ring Pos 116 onto the pump head Place the complete connecting pipe assembly into the lowermost Pump Head Pos 2 making sure it is fully seated Lower the middle Pump Head Pos 2c ov
17. ng ring middle pump head and complete stationary seal by the lowermost pump head Make sure the Priming Vent Plug Pos 18 on the lowermost pump head is inline over the discharge port of the suction discharge base Carefully lowerthe 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 it is critical to position the rotating seal face correctly COMPONENTS OF ROTATING SEAL LOWER COMPONENTS OF SEAL ASSEMBLY Pos 112 Seal Driver with set screws Pos 113 Reassembly Procedures CR CRN 32 45 64 90 Back to Back Seal continued With the tapered edge facing upward lower the Rotating Seal Face Pos 104 down onto the stationary seal face 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 Pos 106 Cup for O ring and Spring Lower the Pos 107 O Ring Cup Pos 106 over the O ring Pos 111 Lower the Floating Seal Driver Spring Lubricate the inner surface of the i une O ring Pos 107 with Rocol Dow Corning 111 or soapy water Slide the O ring down the shaft until it contacts both the driv
18. of gouging or wear throughout its total length Use emery tool to remove shaft seal set screw marks Stack Compression Spacer 60 Should always be replaced Shaft Seal F Cartridge Complete 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 2 GRUNDFOS X To reinstall the Chamber Bearing Ring Pos 47 or Bearing Sleeve Pos 47c and Bearing Lock Ring Pos 47d or 47e 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 a rubber 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 areaisnotworn 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 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 lbs 31Nm Remove the hold pin and the bottom bearing 6g after torque value is achieved After pressing on a new We
19. pump types in the photoatandem seal version is shown Lift the shaft and insert the adjusting fork under the seal collar 59 Tandem Seal Only q hi _ nS 5 i 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 Make sure the gaps on both sides of the coupling are even Applies to all pump types GRUNDFOS n Reassembly Procedures CR CRN 32 45 64e90 Standard Cool Top amp Back to Back Seal Units Remove the adjusting fork For storage place the adjusting fork around Fit Coupling Guard Pos 7 over screws one of the seal holder allen screws Check Pos 7a Torque to 6 ft lbs 8Nm rotation by turning the coupling by hand If the shaftis tight orwillnot rotate disassemble and begin the assembly procedure again Tandem Seal Remove the adjusting forks For storage place the adjusting Install system piping to Fit the coupling guard and forks around two of the seal the tandem seal housing screws Torque screws to retaining screws Check rotation 6 ft lbs 8Nm by turning the coupling by hand If the shaft is tight or will not rotate disassemble and begin the assembly procedure again THE PUMP IS NOW COMPLETELY REASSEMBLED Return the pump to the system and ins
20. rd along with the wear ring puller 00SV0239 used to pry off the wear ring Ifthethreads of the impellerhubare damaged a new impeller willbe required 10 GRUNDFOS Dismantling Procedures CR CRN 32 45 64 90 A To remove the Bottom Bearing Pos 6g loosen and remove the securing 5 mm Allen Using a small screwdriver remove Screw Pos 31 and Washer Pos 32 from the Suction Discharge Base Sleeve O rings Pos 37 fromthe pump Pos 6 Using the bearing puller OOSVOOO2 and allen screw 00ID6595 insert head andthe suction discharge base 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 begin turning the allen screw until the bearing has been pryed out of the housing THE PUMP IS NOW COMPLETELY DISASSEMBLED Remove the four Stack Compression Spacers Pos 60 GRUNDFOsS n Dismantling Procedures CR CRN 32 45 64e90 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 and fairly inexpensive it is recommended they be replaced whenever
21. roove in the housing of the Tandem Seal Pos 105c Place the O ring Pos 109 into the groove of the tandem seal housing a Evenly tighten and then torque the three 3 mmsetscrews to 6ft lbs 8Nm Lubricate the inner surface of the lower O ring of the Shaft Seal Pos 105 with Rocol Dow Corning 111 or soapy water Slidethe seal down the shaft by pushing against the the drive collar of the seal Seat the seal firmly in place For Tandem Seal equipped pumpsonly continue with step 49 All other pump types Standard Cool Top and Back to Back units skip to step 55 Pushing against the drive collar Slide the tandem seal assembly down the shaft until it stops against the lower shaft seal Lift the shaft upward and place the Adjust Fork Spacing Tool 985924 between the housing and seal driver ring Tandem Seal continues with step 58 Reassembly Procedures CR CRN 32 45 64 90 Standard Cool Top amp Back to Back Seal Units 3 i 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 screws to 46ft lbs 62Nm Attach the motor and motor stool separately to the pump head Lubricate the threads on the 8 mm hex socket Retaining Screws Pos 28 with Gardolube or Thread Eze Install and diagonally torque to 46ft lbs 62Nm Place the motor onto the motor stool lu
22. tall 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 2 GRUNDFOos Reassembly Procedures CR CRN 32 45 64e90 CR CRN 32 Order of Stage Assembly NO WAOADN Low NPSH Combination Replacement ae Start for Low NPSH order 14 13 12 O 11 fz a ie e e ee o Low NPSH 2 Combination Replacement NDO WAAONDW O ni 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 descriptions O A a GRUNDFOS X 23 Reassembly Procedures CR CRN 32 45 6490 U FON OMOOrRON STON with 44a x Nn at Zw UW a 3 o bta For Low NPSH replace the first 49e with 49i CRN 45 Order of Stage Assembly Legend CR Low NPSH Combination Replacement c TOS N awe Zou se 8 O a Ow Uw Low NPSH units start with 2 1 and continue to the 10 stage NOTE Refer to Parts List for ALL position descriptions 4 GRUNDFOS Reassembly Procedures CR CRN 32 45 64e90 CR CRN 64 Order of Stage Assembly 2 p lt Low NPSH Combination Replacement T Start for Low NPSH order T 6 5 4 3 2 1
23. the pump is disassembled C gt Neck Ring 45 Should be free of visible wear on the inside edges Inside diameter for CR CRN 32 66 2 mm CR CRN 45 73 9 mm O CR CRN 64 86 3 mm CR CRN 90 93 8 mm Bearing Ring 47a The diameter size difference between the Bearing Ring Pos 47a and the Bearing 47 47c fixed inside the intermediate chambers should be no greater than 0 4 mm Bushing and Bearings 6g 47 47b 47c The diameter size difference between the Bearing Ring Pos 47a and the Bearing Pos 47 47c fixed inside the intermediate chambers should be no greater than 0 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 step 54 amp 57 of the Reassembly procedures the impellers are not suspended as they should be but instead they rub against the chambers either above or below causing contact wear 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
24. to the Reassembly section step 47 To continue disassembly proceed to step 48 Loosen and remove the 24 mm Staybolt Nuts Pos 36 and Washers Pos 66a Dismantling Procedures CR CRN 32 45 64 90 To remove Outer Sleeve Pos 55 grip staybolts diagonally Using your thumbs press against sleeve to release Remove Pump Head Pos 2 this may the sleeve Lift the impeller STACK Pos 80 off require light tapping with a rubber the suction discharge base Pos 6 mallet to the underside of the pump For Stack Replacement instructions head to loosen Once pump head is housing Lift off go to Reassembly Section step loose lift off of pump 15 To continue disassembly sleeve proceed with steps 54 to 66 from the pump Fit assembly disass mbly tonl Loosen the chamber straps Remove the Upper Chamber Pos 3 0OOSV0003 to Stack Thetool consists remove 6 mm hex socket Allen of different size spacing plates Select Screw Pos 26b Washer Pos 26c the plate which fits securely to the and Chamber Straps Pos 26a Stack Interface Pos 44 Place holding pin into the disassembly hole Loosen Split Cone Nut Pos 48 approximately two to three full turns with split cone Remove Base Interface Pos 44 nut wrench OOSVOO0A4 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 Li
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