Grundfos NK Service Instructions Manual
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Grundfos NK Service Instructions Manual

Grundfos NK Service Instructions Manual

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GRUNDFOS INSTRUCTIONS
NK, NKE, NKG, NKGE
Service instructions

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Summary of Contents for Grundfos NK

  • Page 1 GRUNDFOS INSTRUCTIONS NK, NKE, NKG, NKGE Service instructions...
  • Page 3 NK, NKE, NKG, NKGE English (GB) Service instructions ............... . 4...

  • Page 4: Table Of Contents

    Nameplate ....... 5 installation and operating instructions, safety instructions and Type key - NK, NKE, NKG, NKGE ....7 service instructions.

  • Page 5: Identification

    QR code NK(E) NKG(E) The motors fitted with the pumps are according to the IEC Example of NK nameplate standard (International Electrotechnical Commission) for frame size, dimensions and connecting interfaces (flange and shaft). Pos. Description The motors fitted with the pumps are according to the NEMA...
  • Page 6 Find your Grundfos Product Center here: 2.2.2 Looking up service parts in Service Kit Catalogue Extra service information can be found in the Service Kit Catalogue compared to the service information in Grundfos Product Center - such as: • Full overview of service architecture including material variants.

  • Page 7: Type Key - Nk, Nke, Nkg, Nkge

    2.3 Type key - NK, NKE, NKG, NKGE Example 1: NK 32-180/166AAEF2S3ESBQQEGX4 Example 2: NK 150-350/328-324AAEF2TBESBQQEWX4 Example 3: NKE 65-225/242ASA2F2SKESBQQENWA Example 4: NKGE 125-100-250/275VACXEF1AESBQQELY1 Example 5: NKGE 125-100-160/160-140BSA1F2AESBAQERW1 Pos. Example 1 -180 /166 BQQE Example 2 -350 /328-324 BQQE Example 3...
  • Page 8 Pos. Explanation Flange pressure rating (PN - rated pressure) 1: 10 bar 2: 16 bar 3: 25 bar 4: 40 bar 5: Other pressure rating...
  • Page 9 Pos. Explanation Code for materials Code Pump housing Impeller Wear ring Shaft EN-GJL-250 EN-GJL-200 Bronze/brass 1.4021/1.4034 EN-GJL-250 Bronze CuSn10 Bronze/brass 1.4021/1.4034 EN-GJL-250 EN-GJL-200 Bronze/brass 1.4401 EN-GJL-250 Bronze CuSn10 Bronze/brass 1.4401 EN-GJL-250 EN-GJL-200 EN-GJL-250 1.4021/1.4034 EN-GJL-250 Bronze CuSn10 EN-GJL-250 1.4021/1.4034 EN-GJL-250 EN-GJL-200 EN-GJL-250 1.4401...
  • Page 10 Pos. Explanation Rubber parts in pump E: EE F: FF G: FE H: KE I: KM J: KV K: KK M: MN N: ME O: OO V: VV • The first letter indicates material of elastomer between pump housing and cover, and elastomer between cover and split cover. •...
  • Page 11 Example 1: NK 32-180/166AAEF2S3ESBQQEGX4 shows an NK Example 4: NKGE 32-180 pump with these characteristics: 125-100-250/275VACXEF1AESBQQELY1shows an NKGE 125-100-250 pump with these characteristics: • 166 mm closed impeller, cylindrical trim • 275 mm Super Vortex impeller • hydraulic version A •...
  • Page 12 Single mechanical shaft seal HBQV Cartridge seal For a thorough description of shaft seal types and materials, see the data booklet "NB, NBG, NK, NKG, NBE, NBGE, NKE, NKGE - HQQU Cartridge seal Custom-built pumps according to EN 733 and ISO 2858".
  • Page 13 2.3.3 Codes for rated motor power 2.3.4 Codes for phase and voltage or other information Pos. 15 in NK NKE NKG NKGE type key example. Pos. 16 in NK, NKE, NKG, NKGE type key example. Description Code Description Code [hp]...

  • Page 14: Standard Tools

    3. Standard tools Ring/open-end spanner Hexagon T-key Cross-recess screwdriver Reversible-bit screwdriver Bits kit Hexagon key Plastic hammer Pry bar Gauge for inner diameter Torque wrench Soft jaws Pinch bar measurement of wear ring Sliding gauge Ratchet spanner with socket Hexagon key set Steel brush Safety shoes Safety helmet...

  • Page 15: Special Tools

    4. Special tools You can manufacture your own special tools. See descriptions in Appendix A or follow the links with the illustrations. Punch for shaft seal Protective tool Positioning tool 5. Disassembly and assembly 3. Remove the coupling guard to gain access. WARNING Overhead load Death or serious personal injury...
  • Page 16 6. Refer to the table below to make sure that the air gap is correct. 9. Loosen the set screw and remove the pump hub. Air-gap width S2 [mm] Outside coupling Standard coupling Spacer coupling diameter [mm] Nominal Tolerance Nominal Tolerance 0/-1 0/-1 7.
  • Page 17 12. Loosen the cover from pump housing. 15. Use pinch bars to loosen the impeller. 16. Remove the shaft key and the spacer. 13. Use pinch bars to loosen the bearing bracket and the cover from the pump housing. 17. Use pinch bars to remove the rotating part of the shaft seal. Make support for the bearing bracket with a suitable lifting device.
  • Page 18 18. Check conditions of the spring, and seal face. 20. Loosen and remove the coupling guard retainer. Make sure that you do not touch the seal surface. 21. Loosen the bearing cover and remove the V-ring and lock ring. 19. Push out the stationary part of the shaft seal. 22.
  • Page 19 23. Remove the O-rings. 26. Fit the preheated bearings to the shaft. 27. Check condition and cleanliness of the recess for the cover and Bend a soft cable strip to catch the O-ring inside the O-rings bearing bracket. 24. Use a puller to extract the bearings from the shaft. Use locally approved lubricants (example: Rocol sapphire aqua SIL).

  • Page 20: Checking The Gap Between The Impeller And The Pump Housing/Cover (Wear Rings)

    29. Assemble the lock ring, cover and V-ring. 5.2 Checking the gap between the impeller and the pump housing/cover (wear rings) 1. Measure and note the diameter of the impeller and cover interfaces. Use locally approved lubricants (example: Rocol Two measurements must be made (positions 12-6 and sapphire aqua SIL).

  • Page 21: Assembling The Pump

    3. Measure and note the impeller interface to the pump housing. 5.3 Assembling the pump 1. Check condition and cleanliness of the shaft and the cover. For maximum gap values, check the illustrated service instruction. 2. Assemble the stationary seal part. Related information 6.3 Gap between impeller and pump housing/cover (wear rings) Use locally approved thread lubricants (example:...
  • Page 22 4. Lubricate the seal face with soapy water. 7. Check condition and cleanliness of the shaft and impeller interfaces. Polish rusted surfaces using an emery cloth or steel brush. Shaft seal face combination xQQx (siliconcarbide- siliconcarbide) must never run dry. Use locally approved lubricants (example: Never Seez).
  • Page 23 8. Assemble the shaft key and the impeller without using excess 10. Polish rusted surfaces using an emery cloth or steel brush. force. 11. Check condition and cleanliness of the O-ring before assembly. Assembly sequence - washer, spring washer and nut. Use locally approved lubricants (example: Rocol sapphire aqua SIL).
  • Page 24 13. Assemble the screws for the bearing bracket foot and make a 16. Rotate the shaft to make sure that the shaft runs freely with no loose tightening. rub. 17. Check condition of the coupling rubber. If it is hard and cracks when bended - replace it.
  • Page 25 19. Prepare assembly of the spacer coupling. Lubricate screws. 22. Assemble the spacer ring and the spacer. Use locally approved thread lubricants (example Prevent shaft rotation by securing the shaft with a Never Seez). screwdriver in the spacer ring. 20. Make sure that the set screw does not interfere with the shaft If it is not possible to use a torque tool, tighten until key.
  • Page 26 6.1 Torque table. If it is not possible to use a torque tool, tighten until NOTE! Laser alignment – see video on Grundfos YouTube channel resistance + 15 degrees. or find instructions/video on Grundfos Product Center. 25. Assemble coupling guards.

  • Page 27: Reference Information

    6. Reference information 6.3 Gap between impeller and pump housing/cover (wear rings) 6.1 Torque table A leak flow (1) will occur in gap (2) between the rotating impeller and the stationary pump housing when the pump is operating. Leak Impeller nuts flow (1) returns to impeller inlet (3) through gap (2).
  • Page 28 Tolerance table SS pump housing + SS wear ring + SS impeller If the difference exceeds the maximum seal gab according to the Wear ring inside Impeller outside above limit curve, the below table informs whether the wear ring or the impeller is worn out.

  • Page 29: Related Documents

    You can find further product information on grundfos.com about: • NK, NKE, NKG, NKGE • 6.5 Service videos You can find video instructions for the service of NK, NKE, NKG, NKGE pumps by exploring the following QR codes/links: Video QR code How to dismantle and assemble Grundfos NK,...

  • Page 30: Fault Finding The Product

    7. Fault finding the product CAUTION Hot or cold surface DANGER Minor or moderate personal injury Electric shock ‐ When pumping hot or cold liquids, make sure that Death or serious personal injury persons cannot accidentally come into contact with hot ‐...
  • Page 31 Fault Cause Remedy • Increase the liquid level on the inlet side. a) The inlet pressure is too low, resulting in • Open the isolating valve in the inlet pipe. cavitation in the pump. • Make sure that all the conditions in section Pipes are complied with.

  • Page 32: Exploded Drawings

    8. Exploded drawings Center-line outlet, single seal, closed impeller 116 109 POS 20b 109 72a 110a 107 106 66 49 105b 65 24 105c 105c 105b Center-line outlet, single seal, open impeller POS 20b 22 21 105b 105c 105c 105b...
  • Page 33 Tangential outlet, single seal, closed impeller 116 109 POS 20b 116 109 110a 105c Bearing bracket 156a 159a 159f 124e 124c 156b 156f 124d 156d 159f 159k 159a 159h 124e 159f 51 156a 159g 156b 159b 124c 124d 156f 159f 156c 156d 156e...
  • Page 34 Coupling and base frame, Service range - R1 Coupling and base frame, Service range - R2...
  • Page 35 Coupling and base frame, Service range - R6...
  • Page 36 A.1. Drawings for special tools dmot NB dss, dmot dimensions dmot NK dss, d5, dmot dimensions Protective tool This dimensional drawing can be used to manufacture needed Shaft seal diameter - protective tool. The tools can be manufactured in steel or nylon.
  • Page 37 Unit 1, Ground floor, Siu Wai industrial Turkey www.ba.grundfos.com Centre GRUNDFOS Pumps NZ Ltd. GRUNDFOS POMPA San. ve Tic. Ltd. Sti. E-mail: grundfos@bih.net.ba 29-33 Wing Hong Street & 68 King Lam 17 Beatrice Tinsley Crescent Gebze Organize Sanayi Bölgesi Street, Cheung Sha Wan...
  • Page 38 92888948 05.2023 ECM: 1368344 www.grundfos.com...

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