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Grundfos LS Service Instructions Manual
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Grundfos LS Service Instructions Manual

Grundfos LS Service Instructions Manual

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GRUNDFOS INSTRUCTIONS
LS
Service instructions

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Summary of Contents for Grundfos LS

  • Page 1 GRUNDFOS INSTRUCTIONS Service instructions...
  • Page 3 English (GB) Service instructions ............... . 4...

  • Page 4: Table Of Contents

    10.1 Coupling ....... 36 10.2 LS with sleeve ......37 Tips and advice that make the work easier.

  • Page 5: Identification

    2.1.2 Looking up service parts in Service Kit Catalogue Extra service information can be found in the Service Kit Catalogue Nameplate of LS/LSV pump compared to the service information in Grundfos Product Center - such as: • Full overview of service architecture including material variants.

  • Page 6: Type Key

    ACS or WARS certified pump Pump variant 1: Grease-lubrication For LS, pump with motor, common base frame and non-spacer coupling For LSV, pump with motor, base frame, motor stool and non-spacer coupling 2: Grease-lubrication For LS, bare shaft pump with common base frame, non-spacer coupling...

  • Page 7: Code Explanation

    Metal-impregnated (antimony, not approved for potable water). Resin-impregnated (approved for potable water). The example shown is an LS 125-100-305F, standard type with standard coupling, DIN PN 10 flange, cast iron pump casing with SS304 impeller, BBQE mechanical shaft seal and clockwise...
  • Page 8 Pos. Code Material EPDM Nitrile rubber (NBR) ® FKM (Viton For other mechanical shaft seal variants, please contact Grundfos. 2.2.2 Codes for stuffing box Pos. Code Short description of stuffing box Stuffing box with packing rings Uncooled stuffing box With internal barrier fluid Synthetic polymer packing rings, graphite impregnated.

  • Page 9: Service Tool

    3. Service tool 3.1 Standard tools Ring/open-end spanner Hexagon T-key Cross-recess screwdriver Reversible-bit screwdriver Bits kit Torx Screwdriver 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 Sprayer...

  • Page 10: Personal Protective Equipment

    The product will be classified as contaminated if it has been used for a liquid which is injurious to health or toxic. If you request Grundfos to service the product, contact Grundfos with details about the liquid before returning the product for service.

  • Page 11: Maintaining The Product

    Polytac • Check the wear ring clearances. Texaco Polystar RB CAUTION Grundfos recommends Shell Gadus S2 V2202 or SKF LGHP 2 grease for Sharp element relubrication. Minor or moderate personal injury ‐ Wear protective gloves to protect yourself against Grid coupling sharp edges on the impeller and wear rings.

  • Page 12: Dismantling And Assembling The Product

    3. Pump grease into one of the lubricating holes to push the old 5.2 Dismantling the pump without sleeve grease out of the opposite hole. 5.2.1 Preparation 4. Keep pumping until the fresh grease comes out. 1. Find the service tools listed in section Service tools. 5.
  • Page 13 5.2.2 Removing the bearings 5. Remove the screws securing the seal housing. 1. Remove the shaft key. 2. Remove the four screws holding the bearing cover. Install a protecting screw to the shaft before using a puller. 3. Remove the shaft guards. 7.
  • Page 14 9. Measure and record the distance from the end of shaft to the 12. Check the old grease to determine the pump condition. shaft seal. 13. Adjust the lock washer to allow the round nut to be loosened. 10. Loosen the seal retaining ring and pull out the shaft seal. 14.
  • Page 15 17. Pull the bearing out of the seal housing (depends on variants) 21. Use locally approved lubricants (example: Rocol sapphire aqua and make sure to catch the spacer washer behind. SIL). 22. Lubricate the seal with new grease, see service instruction for grease type.
  • Page 16 3. Clean and inspect the seal housing before assembling the other 7. When the end of the bearing tool is wider than the lip seal, it will components. be positioned correct. 8. Use locally approved lubricants (example: Rocol sapphire aqua SIL) or soapy water.
  • Page 17 3. Loosen the upper pump housing using jacking screws (inch 5.2.5 Removing the shaft, impeller and gasket thread). 1. Mark the direction of impeller rotation. 2. Use a solid punch (soft material such as brass) to loosen the round nuts for securing the impeller. 4.
  • Page 18 5. Remove the inner round nut from the shaft. 9. Polish rusted surfaces and burrs with an emery cloth or steel brush. Related information 6. Push the shaft out of the impeller and inspect for wear and marks. 11.2 Gap between impeller and wear ring of pump housing 7.

  • Page 19: Dismantling The Pump With Sleeve

    3. Install the shaft to impeller and make sure it fits to the impeller rotation. LS can be offered with sleeve and the service sequences of the pump with sleeve is the same as without sleeve. The sleeve is a wear part and can be ordered as a service part.
  • Page 20 12. Tighten the round nuts for securing the impeller with a soft punch (brass). Vacuums clean the lower pump housing and make sure that no water is trapped in the thread holes. 13. Make sure that the shaft and impeller are in position. 9.
  • Page 21 3. Clean and install the shaft seal on the non-drive. 7. Use the right size of bearing tool to push in the rotating seal part. 4. Lubricate the shaft with locally approved lubricants or soapy 8. Set the rotating shaft seal to the right position (measured when water.
  • Page 22 2. After installing the lip seal, install the stationary shaft seal. Make 8. Make sure that the shaft can move freely in both directions and sure not to touch the stationary shaft seal surface. with tension from the shaft seal springs. 3.
  • Page 23 12. Take a final measurement of the drive-end shaft and compare it to the measurement taken before dismantling. 17. Lubricate and install the round nut for bearing. 13. Before assembling the bearing on non-drive end, install the spacer washer if fitted - depends on variants. 18.
  • Page 24 20. Grease the gasket for the bearing cover, use locally approved lubricants (example: Rocol sapphire aqua SIL). The sound of hammering changes when the bearing is in place. 21. Half fill the bearing cover with new grease, see section Ball bearing grease.

  • Page 25: Assembling The Pump With Sleeve

    5.5 Assembling the pump with sleeve Pos. Description See section Dismantling the pump with sleeve. Vertical Related information Horizontal 5.3 Dismantling the pump with sleeve 4. Check angular alignment. Insert a pair of inside callipers or a taper gauge at four points 6.

  • Page 26: Taking The Product Out Of Operation

    Angular alignment - vertically Pos. Description Dial gauge (2) for parallel alignment Index line Dial gauge (1) for angular alignment The coupling alignment procedure has four steps: Parallel alignment - vertically 1. Turn the motor and pump shaft until the dial gauge (1) is in position 0 °...
  • Page 27 CAUTION Hot or cold surface Minor or moderate personal injury ‐ Make sure that the escaping water does not cause injury to persons or damage to the motor or other components. ‐ In hot-water installations, pay special attention to the risk of injury caused by scalding hot water.

  • Page 28: Standard Components And Material Specifications

    8. Standard components and material specifications Pos. Description Material Material standard Cast iron ASTM A48 Class35 Pump housing, upper Ductile iron ASTM A536, 65-45-12 Cast iron ASTM A48 Class35 Pump housing, lower Ductile iron ASTM A536, 65-45-12 coupling Steel Key, impeller Steel ASTM A216 WCB Key, coupling...
  • Page 29 Pos. Description Material Material standard 113g Lip seal, drive end Screw for seal housing Steel 114a Screw for bearing cover Steel 114b Screw for bearing housing Steel Shaft sleeve Stainless steel AISI 304 116a Locking sleeve, drive end Stainless steel AISI 304 116b Locking sleeve, non-drive end...

  • Page 30: Sectional Drawings

    9. Sectional drawings 9.1 LS with sleeve, construction type 1 195 54 20d 20e 124 113e 113c 114a 113d 67b 11 49 24 67a 105 79 53...

  • Page 31: Ls With Sleeve, Construction Type 2

    9.2 LS with sleeve, construction type 2 116b 113c 113e 113d 116a 114a...

  • Page 32: Ls With Sleeve, Construction Type 3

    9.3 LS with sleeve, construction type 3 116e 113d 113e 113c 114a...

  • Page 33: Ls With Sleeve, Construction Type 4

    9.4 LS with sleeve, construction type 4 113g 58a 116e 109a 109 124 114a 113f 113g 113d 113c 114b 116d 116c 113e...

  • Page 34: Ls Without Sleeve, Construction Type 1

    9.5 LS without sleeve, construction type 1 113d 105 105a 67b 11 49 113e 113c 113g 11a 113f 105b 113f 114a 9.6 LS without sleeve, construction type 2 113d 195 54 113f 58a 105 105b 20d 20e 17 11 109a 109...

  • Page 35: Ls, Typical End View, Non-Drive End

    9.7 LS, typical end view, non-drive end...

  • Page 36: Exploded Views

    10. Exploded views 10.1 Coupling Joining with coupling...

  • Page 37: Ls With Sleeve

    10.2 LS with sleeve optional 20d 20e17 116b 116e 116a 116a 116b 116e 54e 54f 116b 113d 195 116c 113e 114a 113d 113e 114a 124d 124c LS with sleeve...

  • Page 38: Ls Without Sleeve

    10.3 LS without sleeve 20d 20e 113c 113g 105a 105c 109b 124d 124c 105a 105c 124d 124c 105a 105c 124c 105a 105c 124d 124d 124c 105a 124c 113d 195 105c 124d 113e 114a 105a 105c 124d 124c 113f 114b 109a...

  • Page 39: Ls Double Stage

    10.4 LS double stage 116d 116e 116a 116c 116b 116a 116e 116c 113e 116b LS with double stage...

  • Page 40: Reference Information

    11. Reference information Recommended torque for inch bolts Specification (Grade Recommended 11.1 Tightening torques Tolerance Torque (Nm) 1/4" ±10% Recommended torque for metric bolts 5/16" ±10% Specification (Grade Recommended Tolerance 3/8" ±10% 5.6) Torque (Nm) 1/2" ±10% ±10% 5/8" ±10% Specification (Grade Recommended Tolerance...

  • Page 41: Gap Between Impeller And Wear Ring Of Pump Housing

    11.2 Gap between impeller and wear ring of pump Recommended torques for round nut housing Recommended Specification Tolerance Torque (Nm) A leak flow (1) will occur in gap (2) between the rotating impeller and the stationary pump housing when the pump is operating. Leak GB/T812 M25X1.5 F ±10% flow (1) returns to impeller inlet (3) through gap (2).
  • Page 42 Tolerance table If the difference exceeds the maximum seal gab according to the above limit curve, the below table informs whether the wear ring or the impeller is worn out. GG pump housing + bronze wear ring + SS impeller Wear ring inside Impeller outside Nominal...

  • Page 43: Fault Finding The Product

    12. Fault finding the product DANGER Electric shock Death or serious personal injury ‐ Before you remove the terminal box cover and before you remove or dismantle the pump, make sure that the power supply has been switched off and that it cannot be accidentally switched on. Faults Causes A: The pump delivers no liquid.
  • Page 44 15 The inlet pipe is not immersed deeply enough. Extend the inlet pipe so that the risk of sucking air is eliminated. Check with Grundfos if you can use a larger impeller. If not, reduce the outlet pipe 16 The impeller diameter is too small.

  • Page 45: Disposing Of The Product

    This product or parts of it must be disposed of in an environmentally sound way. 1. Use the public or private waste collection service. 2. If this is not possible, contact the nearest Grundfos company or service workshop. The crossed-out wheelie bin symbol on...
  • Page 46 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 47 99613935 02.2025 ECM: 1417477 www.grundfos.com...

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