Grundfos NB Series Service Instructions Manual
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Grundfos NB Series Service Instructions Manual

Grundfos NB Series Service Instructions Manual

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1.
Identification .................................................................................................................................... 2
1.1
Nameplate ........................................................................................................................................................... 2
1.2
Type key .............................................................................................................................................................. 3
1.3
Handling............................................................................................................................................................... 4
2.
Dismantling and assembly ............................................................................................................. 5
2.1
General information ............................................................................................................................................. 5
2.2
Dismantling .......................................................................................................................................................... 5
2.3
Replacing the wear rings ..................................................................................................................................... 6
2.4
Assembling the pump .......................................................................................................................................... 6
3.
Fault finding ..................................................................................................................................... 7
4.
Service tools .................................................................................................................................... 9
4.1
Special tools ........................................................................................................................................................ 9
4.2
Standard tools.................................................................................................................................................... 10
4.3
Torque tools....................................................................................................................................................... 10
5.
Tightening torques and lubricants............................................................................................... 11
5.1
Lubrication ......................................................................................................................................................... 11
6.
Exploded view................................................................................................................................ 12
GB
96778604 1111
Service instructions
NB/NBG
1 / 12

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Summary of Contents for Grundfos NB Series

  • Page 1: Table Of Contents

    Service instructions NB/NBG Identification ............................ 2 Nameplate ................................2 Type key ................................3 Handling................................4 Dismantling and assembly ......................5 General information ............................. 5 Dismantling ................................5 Replacing the wear rings ............................. 6 Assembling the pump ............................6 Fault finding ............................. 7 Service tools ............................

  • Page 2: Identification

    1. Identification 1.1 Nameplate Type NB 80-200/196 A-F-A-BAQE B 96125133 P2 0612 0001 Model m /h 10.8 1445 91.2 bar/°C 16/120 Made in Hungary Fig. 1 Example of nameplate for NB The example shows an NB 80-200 with 196 mm impeller, made of cast iron, with BAQE shaft seal and a 4-pole motor. Type NBG 125-80-200/196 A-F-A-BAQE A 96125133 P2 0612 0001...

  • Page 3: Type Key

    1.2 Type key NB 32 -125 .1 /142 A -F -A -BAQE NBG 50 -32 -125 .1 /142 A -F -A -BAQE Type range Type range NBGE Nominal diameter of suction port (DN) Nominal diameter of discharge port (DN) Nominal diameter of discharge port (DN) Nominal impeller diameter [mm] Nominal impeller diameter [mm]...

  • Page 4: Handling

    Mechanical shaft seal Shaft seal diameter [mm] 28, 38 Code Temperature range Max. pressure [bar] Rubber bellows seal, metal-impregnated carbon/silicon carbide, BAQE 0 °C to +120 °C EPDM Rubber bellows seal, metal-impregnated carbon/silicon carbide, BAQV 0 °C to +90 °C Rubber bellows seal, silicon carbide/silicon carbide, EPDM BQQE 0 °C to +90 °C...

  • Page 5: Dismantling And Assembly

    2. Dismantling and assembly 2.1 General information Follow these instructions if it is necessary to dismantle the pump, either because it is clogged or damaged. Position numbers of parts (digits) refer to section 6. Exploded view; position numbers of service tools (letters) refer to section 4.

  • Page 6: Replacing The Wear Rings

    2.3 Replacing the wear rings Pump with bronze wear rings 1. Insert the hook of the puller (pos. C) under the wear ring (pos. 45 or 45b). 2. Knock the impact block against the puller end stop. Move the puller to another position under the wear ring. 3.

  • Page 7: Fault Finding

    3. Fault finding Warning Before removing the terminal box cover and before any dismantling of the pump, make sure that the electricity supply has been switched off. It must be ensured that it cannot be accidentally switched on. Fault Cause Remedy 1.
  • Page 8 Fault Cause Remedy 5. Too high temperature a) Air in suction pipe or pump. Vent the suction pipe or the pump, and replenish. in pump or motor. b) Inlet pressure too low. Increase the liquid level on the suction side. Open the isolating valve in the suction pipe.

  • Page 9: Service Tools

    4. Service tools 4.1 Special tools Pos. Description For pos. Further information Part number V7216304 V7216305 Protective sleeve 70007165 70007166 70007167 V7216306 V7216307 Punch for shaft seal 70007172 70007173 70007174 Puller for wear ring 45, 45b 96824962 9 / 12...

  • Page 10: Standard Tools

    4.2 Standard tools Pos. Description For pos. Further information Part number Strap wrench 00SV0853 Puller Pinch bar SV5201 17 mm SV0056 19 mm SV0063 22 mm 00SV0186 Ring/open-end spanner 36, 36a, 67 24 mm SV0122 30 mm SV0073 36 mm Polygrip pliers SV0150 Plastic hammer...

  • Page 11: Tightening Torques And Lubricants

    5. Tightening torques and lubricants Pos. Description Quantity Dimensions Torque [Nm] Lubricant Screw 6 ± 2 2, 3 6 ± 1 Set screw 2, 3 8 ± 2 Loctite 243 2, 3 15 ± 3 30 ± 3 Hexagon socket head screw 100 ±...

  • Page 12: Exploded View

    6. Exploded view Fig. 5 Exploded view Subject to alterations. 12 / 12...

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