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Grundfos CR 32 Service Manual
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Grundfos CR 32 Service Manual

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CR SERVICE MANUAL
CR, CRN 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 21
Order of Stage Assembly - CR, CRN 32 ........................Page 23
Order of Stage Assembly - CR, CRN 45 ........................Page 24
Order of Stage Assembly - CR, CRN 64 ........................Page 25
Order of Stage Assembly - CR, CRN 90 ........................Page 26
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
31
Allen Screw for Bottom
Stationary Bearing ...................................... 6 ft.-lbs./8 Nm
36
Staybolt Nut ..........................................74 ft.-lbs./100 Nm
48
Split Cone Nut ......................................... 52 ft.-lbs./70 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
GRUNDFOS

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Summary of Contents for Grundfos CR 32

  • Page 1: Table Of Contents

    GRUNDFOS CR SERVICE MANUAL CR, CRN 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 21 Order of Stage Assembly - CR, CRN 32 ......Page 23 Order of Stage Assembly - CR, CRN 45 ......Page 24...

  • Page 2: Dismantling Procedures

    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 instruc tions cover the For shaft seal change only repair of the pump after it has on a Standard unit or a Cool Top®, been isolated from the system.
  • Page 3 Dismantling Procedures CR, CRN 32•45•64•90 Pos. 105 Use two flat/slot blade screwdrivers to pry the seal 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 Cartridge Seals the Reassembly section step 47.
  • Page 4 Dismantling Procedures CR, CRN 32•45•64•90 Cool-Top® To remove the upper sleeve, diagonally Remove the upper most Pump Head Remove the upper most pump head. grip the Staybolts (Pos. 26). Using (Pos. 2b), Upper Sleeve (Pos. 55a) This may require light upward blows your thumbs, press against the and middle Pump Head (Pos.
  • Page 5 Dismantling Procedures CR, CRN 32•45•64•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. the Seal Driver Remove the upper most Pump Head 55a), diagonally grip the Staybolts ( Pos.
  • Page 6 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 an 8 mm Allen wrench to loosen and remove the Retainer Screw (Pos. 58d). Then, Use 00SV2128 and a rubber mallet to remove the Connecting Pipe Retainer (Pos.
  • Page 7 Dismantling Procedures CR, CRN 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 U s e a n A l l e n w r e n c h w i t h Remove system fl ush piping.
  • Page 8 Dismantling Procedures CR, CRN 32•45•64•90 Tandem Seal (continued) Use two flat/slot blade screwdrivers to pry the seal loose. Lift the seal completely off the shaft. For seal Loosen, but do not remove, the Remove the Tandem Seal Housing change only, go to the Reassembly 3 mm Set Screws (Pos.
  • Page 9 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 the sleeve Lift the impeller STACK® (Pos. 80) off Remove Pump Head (Pos. 2) (this may the suction/discharge base (Pos. 6). require light tapping with a rubber from the pump For Stack Replacement instructions,...
  • Page 10 Dismantling Procedures CR, CRN 32•45•64•90 Remove bearing from shaft. Remove To remove the shaft from the assembly/disassembly tool, remove 6 mm hex socket Allen Screw (Pos. 67), the holding pin from the shaft and locking washers (Pos. 66b), washer lift shaft out of tool. (Pos.
  • Page 11 Dismantling Procedures CR, CRN 32•45•64•90 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) from the pump (Pos.

  • Page 12: When Should A Part Be Replaced

    Dismantling Procedures CR, CRN 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, CRN 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 Punch appropriate neck ring punch To reinstall the Chamber Bearing Ring...
  • Page 14 Reassembly Procedures CR, CRN 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 22-26 for the appropriate staging the fixture. Lay the stack on a flat sequence for your particular surface and check the rotation and model pump.
  • Page 15 Reassembly Procedures CR, CRN 32•45•64•90 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. For all models except Back-to-Back units: Lower the pump head over the Staybolts (Pos.
  • Page 16 Reassembly Procedures CR, CRN 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 place; pipe assembly down over the (Pos.
  • Page 17 Reassembly Procedures CR, CRN 32•45•64•90 Back-to-Back Seal Use 00SV2128 and a rubber mallet Replace the O-rings (Pos. 109a & Place the complete connecting pipe to drive in three new Bushings (Pos. 109b). Do not roll the O-ring into assembly into the lowermost Pump 47g) and the Retainer Ring (Pos.47h) place;...
  • Page 18 Reassembly Procedures CR, CRN 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 Pos.
  • Page 19 Reassembly Procedures CR, CRN 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 upward, Lower the Floating Seal Driver lower the Rotating Seal Face (Pos. 104) (Pos.
  • Page 20 Reassembly Procedures CR, CRN 32•45•64•90 Lubricate the inner surface of the lower O-ring of the Shaft Seal (Pos. 105) Slide the Washers (Pos.66a) over with Rocol, Dow Corning 111, or soapy the Staybolts (Pos. 26). Lubricate When reusing an existing shaft, water.

  • Page 21: Setting The Coupling Height

    Reassembly Procedures CR, CRN 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 downward (for Back-to- L i f t t h e s h a f t a n d i n s e r t t h e adjusting fork under the seal collar.
  • Page 22 Reassembly Procedures CR, CRN 32•45•64•90 Standard, Cool Top®, & Back-to-Back Seal Units Fit Coupling Guard (Pos. 7) over screws Remove the adjusting fork. For storage, place the adjusting fork around one of the seal holder allen screws. Check (Pos. 7a). Torque to 6 ft.-lbs./8Nm. rotation by turning the coupling by hand.

  • Page 23: Order Of Stage Assembly - Cr, Crn

    Reassembly Procedures CR, CRN 32•45•64•90 CR, CRN 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 24: Order Of Stage Assembly - Cr, Crn

    Reassembly Procedures CR, CRN 32•45•64•90 CR, CRN 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 25: Order Of Stage Assembly - Cr, Crn

    Reassembly Procedures CR, CRN 32•45•64•90 CR, CRN 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 26: Order Of Stage Assembly - Cr, Crn

    NOTE: Refer to Parts List for ALL position descriptions. L-CR-SM-010 Rev. 04/10 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...

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