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GRUNDFOS CR SERVICE MANUAL
CR-H, CRN-H
32•45•64•90
Dismantling &
Reassembly
CONTENTS
Dismantling Procedures ................................................... Page 2
When Should A Part Be Replaced ? ................................Page 12
Reassembly Procedures ..................................................Page 13
Setting The Coupling Height ..........................................Page 24
Order of Stage Assembly - CR-H, CRN-H 32 ................ Page 27
Order of Stage Assembly - CR-H, CRN-H 45 ................Page 28
Order of Stage Assembly - CR-H, CRN-H 64 ................Page 29
Order of Stage Assembly - CR-H, CRN-H 90 ...............Page 30
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
28a
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
28g
Allen Screw for Foot/Base .....................15 ft.-lbs./20 Nm
31
Allen Screw for Bottom
Stationary Bearing .....................................6 ft.-lbs./8 Nm
35
Allen Screw for Discharge Flange ........15 ft.-lbs./20 Nm
36
Staybolt Nut ...........................................74 ft.-lbs./100 Nm
48
Split Cone Nut ......................................... 52 ft.-lbs./70 Nm
56 c/e 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
58a &
58d
Allen Screw Seal Carrier ....................... 46 ft.-lbs./62 Nm
67
Allen Screw for Shaft Bearing ...............23 ft.-lbs./31 Nm
113
Allen Set Screw for Shaft Seal..................6 ft.-lbs./8 Nm
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Summary of Contents for Grundfos CR-H 32
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Page 1: Table Of Contents
GRUNDFOS CR SERVICE MANUAL CR-H, CRN-H 32•45•64•90 Dismantling & Reassembly CONTENTS Dismantling Procedures ........... Page 2 When Should A Part Be Replaced ? ........Page 12 Reassembly Procedures ..........Page 13 Setting The Coupling Height ..........Page 24 Order of Stage Assembly - CR-H, CRN-H 32 ....Page 27 Order of Stage Assembly - CR-H, CRN-H 45 ....Page 28... -
Page 2: Dismantling Procedures
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 List and Kits diagram. For shaft seal change only These instruc tions cover the repair of the pump after it has Standard unit or a Cool Top®, been isolated from the system. - Page 3 Dismantling Procedures CR-H, CRN-H 32•45•64•90 Pos. 105 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 Cartridge Seals stool to the pump head.
- Page 4 Dismantling Procedures CR-H, CRN-H 32•45•64•90 Back-to-Back Seal (continued) Slide the threaded seal retainer off the shaft. Next, slide the Retaining Washer Using a small flat tip screwdriver, pry/ Remove the Rotating Seal Face loosen the stationary seal from the (Pos. 59e) off (Pos.
- Page 5 Dismantling Procedures CR-H, CRN-H 32•45•64•90 Tandem Seal Loosen the top Coupling Guard Screw (Pos. 7a), but do not fully remove. Loosen and fully remove the lower screw. Tilt and slide Remove system flush piping. Use an Allen wrench with an 8 mm t h e Co u p l i n g tip to loosen and remove the Coupling Guards (Pos.
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Page 6: Cartridge Seals
Dismantling Procedures CR-H, CRN-H 32•45•64•90 Tandem Seal (continued) 112a Seal Driver Ring Screw Loosen, but do not remove, the 3 mm Remove the Tandem Seal Housing O-ring (Pos. 109c). Set Screws (Pos. 113) from the Shaft Seal (Pos. 105). Seal Housing 109c Pos. - Page 7 Dismantling Procedures CR-H, CRN-H 32•45•64•90 Remove the plastic plugs from the threaded jacking holes. Next, use two of the sleeve flange allen screws and To remove the cartridge assembly Loosen and remove all the Sleeve place into the threaded holes of the from the Suction/Discharge Base, Flange Nuts (Pos.
- Page 8 Dismantling Procedures CR-H, CRN-H 32•45•64•90 Cool-Top Cool-Top Cool-Top ® ® ® Loosen and remove the 8 mm hex socket Retainer Screws (Pos. 58d). Remove the Connecting Pipe Place the connecting pipe into one of Remove the (Pos. 149). the pump heads. Use 00SV2128 and a Connecting Pipe rubber mallet to drive out the Retainer Retainer...
- Page 9 Dismantling Procedures CR-H, CRN-H 32•45•64•90 To remove the Bottom Bearing (Pos. 6g), loosen and remove the 5 mm Hex Socket Allen Remove the four STACK Compression Screw (Pos. 31) and Washer (Pos. 32) from the Sleeve Flange (Pos. 55b). Using the Bearing Spacers (Pos.
- Page 10 Dismantling Procedures CR-H, CRN-H 32•45•64•90 To remove the shaft from the Remove bearing from shaft. Remove assembly/disassembly tool, remove 6 mm hex socket Allen Screw (Pos. 67), the holding pin from the shaft and Locking Washer (Pos. 66b), Washer lift shaft out of tool. (Pos.
- Page 11 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. Push the Flange Ring (Pos. 201) down, Remove the O-ring (Pos. 39b). Remove the Flange Allen Screws use a screwdriver to remove the (Pos.
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Page 12: When Should A Part Be Replaced
Dismantling Procedures CR-H, CRN-H 32•45•64•90 When Should A Part Be Replaced? Part Position(s) Minimum Operating Condition Pump Head 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 Base Chambers... -
Page 13: Reassembly Procedures
Reassembly Procedures CR-H, CRN-H 32•45•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 into the Chamber (Pos. 4 or 4a) or Base Interface (Pos. 44). Position the appropriate neck Punch ring punch To reinstall the Chamber Bearing Ring... - Page 14 Reassembly Procedures CR-H, CRN-H 32•45•64•90 Remove the holding pin from the assembly/dismantling fixture. Refer to the diagrams on pages Lift the STACK® (Pos. 80) out of 27-30 for the appropriate staging the fixture. Lay the stack on a flat sequence for your particular model surface and check the rotation and pump.
- Page 15 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 (00RM 2924) or Dow ®...
- Page 16 Reassembly Procedures CR-H, CRN-H 32•45•64•90 Cool-Top® Use 00SV2128 and a rubber mallet Replace the O-rings (Pos. 109a & Slide the completed connecting to drive in three new Bushings 109b). Do not roll the O-ring into pipe assembly down over the (Pos.
- Page 17 Reassembly Procedures CR-H, CRN-H 32•45•64•90 Back-to-Back Seal Use 00SV2128 and a rubber mallet Replace the O-rings (Pos. 109a & Place and fully seat the complete to drive in three new Bushings (Pos. 109b). Do not roll the O-ring into connecting pipe assembly into the 47g) and the Retainer Ring (Pos.47h) place;...
- Page 18 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 Ring Side View Pos. 102a O-Ring Pos. 103a Retainer For Upper Side View Seal Ring Lower and press the completed Lubricate the inner surface of the Pos.
- Page 19 Reassembly Procedures CR-H, CRN-H 32•45•64•90 Back-to-Back Seal (continued) COMPONENTS OF ROTATING SEAL LOWER COMPONENTS OF SEAL ASSEMBLY Pos. 112 Seal Driver with set screws, Pos. 113 With the tapered edge facing Slide/lower the Floating Seal Driver (Pos. 111) until it fully engages the u p wa rd /o u t wa rd , s l i d e / l o we r Pos.
- Page 20 (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. / 100 Nm...
- Page 21 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 Lubricate the threads on the 8 mm bolts diagonally to: hex socket Retaining Screws (Pos. 28) with Gardolube or Thread-Eze.
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Page 22: Tandem Seal
Reassembly Procedures CR-H, CRN-H 32•45•64•90 Tandem Seal Fit the cup for O-ring and Spring (Pos. Select the desired EPDM or FKM O-ring Fit the floating driver (Pos. 111) onto 106) onto the spring. (Pos. 107) and slide it down the seal the O-ring. - Page 23 Reassembly Procedures CR-H, CRN-H 32•45•64•90 Tandem Seal (continued) Place the rotating seal assembly Spray soapy water onto the o-ring Hold this housing down. (If the set and seal the insert. Fully seat these onto Punch 00SV0015. Before lowering screw holes are not fully accessible, items into the Tandem Seal Housing the tandem/flush seal housing, remove the housing and reposition...
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Page 24: Setting The Coupling Height
Reassembly Procedures CR-H, CRN-H 32•45•64•90 Standard, Cool Top® & Back-to-Back Seal Units L o w e r a n d s e a t t h e R e t a i n e r Push the shaft inward (for Back-to-Back Pull the shaft outward and insert the (Pos. - Page 25 Reassembly Procedures CR-H, CRN-H 32•45•64•90 Standard, Cool Top® & Back-to-Back Seal Units For storage, place the adjusting fork around one of the seal holder allen screws. Check rotation by turning the coupling by hand. If the shaft Remove the adjusting fork. Fit Coupling Guard (Pos.
- Page 26 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 Place and seat O-ring (Pos. 39b). groove in Flange (Pos. 12a). Place Align flange Flange position to locate (Pos.
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Page 27: Order Of Stage Assembly - Cr-H, Crn-H
Reassembly Procedures CR-H, CRN-H 32•45•64•90 CR-H, CRN-H 32 Order of Stage Assembly Low NPSH Combination Replacement Start for Low NPSH order * Low NPSH Combination Replacement Legend *Low NPSH units start with 2-1 and continue to the 14 stage. NOTE: Refer to Parts List for ALL position descriptions. -
Page 28: Order Of Stage Assembly - Cr-H, Crn-H
Reassembly Procedures CR-H, CRN-H 32•45•64•90 CR-H, CRN-H 45 Order of Stage Assembly Low NPSH Combination Replacement Start for Low NPSH order * Low NPSH Combination Replacement Legend *Low NPSH units start with 2-1 and continue to the 10 stage. NOTE: Refer to Parts List for ALL position descriptions. -
Page 29: Order Of Stage Assembly - Cr-H, Crn-H
Reassembly Procedures CR-H, CRN-H 32•45•64•90 CR-H, CRN-H 64 Order of Stage Assembly Low NPSH Combination Replacement Start for Low NPSH order * Low NPSH Combination Replacement Legend *Low NPSH units start with 2-1 and continue to the 7-1 stage. NOTE: Refer to Parts List for ALL position descriptions. -
Page 30: Order Of Stage Assembly - Cr-H, Crn-H
NOTE: Refer to Parts List for ALL position descriptions. L-SM-DR-101 0110 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.
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