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GRUNDFOS CR SERVICE MANUAL
CR-H, CRN-H 10•15•20
Dismantling &
Reassembly
CONTENTS
Dismantling Procedures ................................................Page 2
When Should A Part Be Replaced ? .............................................Page 10
Reassembly Procedures ............................................... Page 11
Setting The Coupling Height ........................................................Page 18
Order of Stage Assembly: CR-H, CRN-H .................................... Page 20
Order of Stage Assembly: CR-H, CRN-H Low NPSH 10 ........... Page 21
Order of Stage Assembly: CR-H, CRN-H 15/20 ......................... Page 22
Order of Stage Assembly: CR-H, CRN-H Low NPSH 15/20 .... Page 23
TORQUES
Position
Number
7a
Coupling Guard Screw ............................. 1.5 ft.-lbs./2 Nm
9
Coupling Hex Screw
5 mm M6 Screw .................................... 10 ft.-lbs./13 Nm
6 mm M8 Screw ................................... 23 ft.-lbs./31 Nm
8 mm M10 Screw .................................46 ft.-lbs./62 Nm
26b
Strap Bolt
13 mm M8 x 25 mm ...............................11 ft.-lbs./15 Nm
28
Motor Bolt
9/16" UNC 3/8" Bolt ............................. 10 ft.-lbs./13 Nm
3/4" UNC 1/2" Bolt ................................ 23 ft.-lbs./31 Nm
28g
Allen Screw for Foot/Base ......................15 ft.-lbs./20 Nm
35
Allen Screw for Discharge Flange ........15 ft.-lbs./20 Nm
36
Staybolt Nut
CR-H ........................................................59 ft.-lbs./80 Nm
CRN-H ................................................... 74 ft.-lbs./100 Nm
56 c/e
Allen Screw for Sleeve Flange ............... 55 ft.-lbs./75 Nm
67
Shaft Lock Nut ........................................16.3 ft.-lbs./22 Nm
105 (a,b) Shaft Seal
41 mm Nut ............................................ 26 ft.-lbs./35 Nm
113
2.5 mm Set Screw ..................................2 ft.-lbs./2.5 Nm
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Table of Contents
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Summary of Contents for Grundfos CRN-H 10
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Page 1: Table Of Contents
GRUNDFOS CR SERVICE MANUAL CR-H, CRN-H 10•15•20 Dismantling & Reassembly CONTENTS Dismantling Procedures ..........Page 2 When Should A Part Be Replaced ? ..........Page 10 Reassembly Procedures ..........Page 11 Setting The Coupling Height ............Page 18 Order of Stage Assembly: CR-H, CRN-H ........Page 20 Order of Stage Assembly: CR-H, CRN-H Low NPSH 10 ... -
Page 2: Dismantling Procedures
Dismantling Procedures CR-H, CRN-H 10•15•20 These instructions cover the complete dismantling and repair of the pump after the pump 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. - Page 3 Dismantling Procedures CR-H, CRN-H 10•15•20 Remove the cartridge Shaft Seal (Pos. 105) by: · Loosening the three 2.5 mm Shaft Seal Securing Allen Screws (Pos. 113) approximately 1/2 to 1 turn. · Using the Specialty Tubular Box Spanner (00SV2107), a 41 mm ring spanner (00SV2101), or a deep socket, fully unscrew the Shaft Seal from the Motor Stool (Pos.
- Page 4 Dismantling Procedures CR-H, CRN-H 10•15•20 – Cool-Top® Cool-Top ® Remove the Cool-Top® assembly/Pump Before removing the Disk Plate (Pos. 79a) Head Cover (Pos. 77a). Light blows with from the Pump Head (Pos. 77), inspect a rubber mallet may be required to the Bushing (Pos.
- Page 5 Dismantling Procedures CR-H, CRN-H 10•15•20 Back-to-Back Seal (View from a cutaway pump) Loosen and remove the plug to allow access to Shaft Seal securing screw. Insert a 2.5 mm allen wrench to loosen (approximately 1/2 to 1 turn) the three Set Screws (Pos. 113) of the Inboard Seal (Pos.
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Page 6: Tandem Seal
Dismantling Procedures CR-H, CRN-H 10•15•20 Tandem Seal Loosen (approximately 1/2 to 1 Use specialty Tubular Box Spanner (00SV2107), a 41 mm Deep Socket, or an Open Ring Spanner to loosen. turn) the three 2.5 mm Set Screws (Pos. 113) of the Inboard Seal (Pos. - Page 7 Dismantling Procedures CR-H, CRN-H 10•15•20 Grab the shaft and lift Impeller Stack Place the Holder for Shaft (00SV0040) in a vise. With the shaft pin inserted into the (Pos. 80) out of the pump. If it's stuck, shaft, place the impeller stack into the shaft holder. Tighten vise. Using a 13 mm wrench, a light blow with a rubber mallet may remove the Chamber Stack Strap Bolt (Pos.
- Page 8 Dismantling Procedures CR-H, CRN-H 10•15•20 The dismantling procedures from this point will depend on the type of pump and number of stages it contains. Beginning on page 20, refer to the charts in the Reassembly Procedures to determine what you can expect with the pump you are working on.
- Page 9 Dismantling Procedures CR-H, CRN-H 10•15•20 If the Discharge Adaptor Flange (12a) has leaked, the O-ring may need replacment. To remove, follow the next steps after removing the system discharge piping. Push the Flange Ring (Pos. 201[a]) Remove the Flange Allen Screws Remove the O-ring (Pos.
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Page 10: When Should A Part Be Replaced
The eyelet or contact surface for the Neck Ring should not show any signs of wear. If worn, replace impeller on CR-H, CRN-H 10 or Wear Ring only on CR-H, CRN-H 15 and 20. (1) Cavitation the implosion of vapor "bubbles"... -
Page 11: Reassembly Procedures
Reassembly Procedures CR-H, CRN-H 10•15•20 Place Sleeve O-ring (Pos. 37) into recessed area of the Motor Stool (Pos. 2) for CR-H models, or into the Pump Head (Pos. 77) for CRN-H models. Install Sleeve O-ring (Pos. 37b) into Pump Head Cover (Pos. 77a) for CR-H, CRN-H, Cool-Top®, Back-to-Back Seal, Tandem Seal models. - Page 12 Reassembly Procedures CR-H, CRN-H 10•15•20 Lubricate the threaded end of the shaft The Lock Washers (Pos. 66) come as a set. If they become separated, it is important the with Gardolube (00SV9995). Thread washers are repositioned correctly as noted in the diagram. The tabs should interlock the Lock Nut (Pos.
- Page 13 Reassembly Procedures CR-H, CRN-H 10•15•20 Cool-Top ® Place O-rings (Pos. 109a & 37c) onto If the Bushings (Pos. 79b) are removed the Disk Plate (Pos. 79a). Do not roll Press the plate firmly in place. Before from Disk Plate (Pos. 79a), use a Punch the O-rings;...
- Page 14 Reassembly Procedures CR-H, CRN-H 10•15•20 Back-to-Back Seal Position the vent plug in line with the vent sticker and flat surface of the sleeve flange. Use care while sliding/lowering completed Back-to-Back Pump Head Cover into place. Firmly seat over sleeve. If it does not freely seat onto sleeve...
- Page 15 Reassembly Procedures CR-H, CRN-H 10•15•20 Tandem Seal Position the vent plug in line with the Slide the Inboard Seal (Pos. 105b) down the shaft and thread into the pump head. Use vent sticker and flat surface of the specialty Tubular Box Spanner (00SV2107), a 41 mm Open Ring Spanner (00SV2101) or a sleeve flange.
- Page 16 Reassembly Procedures CR-H, CRN-H 10•15•20 Slide the cartridge Support Foot (Pos. 90c) over the staybolts opposite Spray soapy water onto the Seal Lubricate the O-ring with Dow Corning the vent plug. Place the Washers (Pos. O-ring Seating Surface of the Pump 111 or Rocol or spray soapy water on the 66a) over the Staybolts (Pos.
- Page 17 Reassembly Procedures CR-H, CRN-H 10•15•20 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 27 has moved out of place and is pinched, or the flange is not properly engaged into the machined recess/register in the base (see the diagram above);...
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Page 18: Setting The Coupling Height
Reassembly Procedures CR-H, CRN-H 10•15•20 Standard Units and Cool Top® Install the Coupling Halves (Pos. 10a). Apply Gardolube, Thread-eze, or spray Using a screwdriver, lift the Shaft upward. Insert Shaft Seal Spacer tool between Shaft a light machinery oil onto the Coupling Seal Collar and Hex Nut. - Page 19 Reassembly Procedures CR-H, CRN-H 10•15•20 If the Discharge Adaptor Flange and O-ring have been removed, replace following the next steps: Position the Flange to allow access to the 1/4" Pipe Plug (Pos. 23b). Diagonally torque Allen Screws (Pos. 35) to 15 ft.-lbs./20 Nm.
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Page 20: Order Of Stage Assembly: Cr-H, Crn-H
Reassembly Procedures CR-H, CRN-H 10•15•20 Order of Stage Assembly – Models CR-H, CRN-H 10 Legend (*see note below) Impeller Impeller Impeller Top Chamber Lock Nut without Spacing Pipe Guide Vanes Top Chamber Bearing Ring Star Washer with Guide Chamber - CPL... -
Page 21: Order Of Stage Assembly: Cr-H, Crn-H Low Npsh
Reassembly Procedures CR-H, CRN-H 10•15•20 Order of Stage Assembly – Models CR-H, CRN-H 10 (Low NPSH) Legend Impeller Impeller Impeller Impeller Lock Washer Low NPSH Spacing Pipe Chamber Bearing Ring with Guide Clamp Chamber Chamber Vane Chamber with Spacing Pipe... -
Page 22: Order Of Stage Assembly: Cr-H, Crn-H
Reassembly Procedures CR-H, CRN-H 10•15•20 Order of Stage Assembly – Models CR-H, CRN-H 15 & 20 Legend Impeller Impeller Impeller Lock Nut Spacing Pipe Spacing Pipe Lock Washer Bearing Ring Bearing Ring Star Washer Chamber - CPL Clamp Chamber with... -
Page 23: Order Of Stage Assembly: Cr-H, Crn-H Low Npsh
Reassembly Procedures CR-H, CRN-H 10•15•20 Order of Stage Assembly – Models CR-H, CRN-H 15 & 20 (low NPSH) Legend Impeller Impeller Lock Washer Low NPSH Lock Washer Clamp Lock Washer Spacing Pipe Spacing Pipe Clamp Spacing Pipe Clamp Bearing Ring,... - Page 24 L-SM-DR-102 0509 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 C.V.
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