Grundfos SEG.40.12.2.50B Pump
Spare Parts for SEG.40.12.2.50B Grinder Pump
Product Summary
The Grundfos SEG.40.12.2.50B is a 1.2 kW three-phase submersible grinder pump designed for pressurized sewage pumping in domestic and municipal applications. Equipped with a patented grinder system, it efficiently reduces solids to allow transport through small-diameter pipes (DN 40). The pump features a clamp connection for easy disassembly and the SmartTrim system for maintaining impeller clearance.
- Patented Grinder System: Effective maceration of organic solids allows the use of smaller, cost-effective discharge piping.
- SmartTrim Adjustment: Enables easy external adjustment of the impeller clearance to restore factory efficiency without dismantling the pump.
- Watertight Cable Plug: Polyurethane-filled stainless steel cable connection prevents water from penetrating the motor windings.
- Clamp Connection: A stainless steel clamp secures the motor to the pump housing, facilitating quick service and rotation of the outlet.
- Cartridge Shaft Seal: The primary and secondary seals are combined into a single, easy-to-replace cartridge unit.
Spare Parts List
| Select | Qty | Part Number | Description | Material / Spec |
|---|---|---|---|---|
| 1 | 96076121 | Grinder System Kit (Head, Ring, Screw) | Standard | |
| 1 | 96076122 | Shaft Seal Complete (0.9-1.5 kW) | NBR | |
| 1 | 96076116 | Impeller Complete (w/ Nut & Key) | Cast Iron | |
| 1 | 96076125 | O-Ring Service Kit (0.9-1.5 kW) | NBR | |
| 1 | 96076124 | Shaft with Rotor Complete | - | |
| 1 | 96690420 | Lifting Bracket Kit | Stainless Steel | |
| 1 | 96586753 | Shell Ondina X420 Oil | Paraffinic Oil | |
| 1 | Pos. 44 | Grinder Ring | Hardened Steel | |
| 1 | Pos. 45 | Grinder Head | Hardened Steel | |
| 1 | Pos. 92 | Clamp | Stainless Steel | |
| 1 | Pos. 50 | Pump Housing | Cast Iron | |
| 1 | Pos. 105 | Shaft Seal Unit | - | |
| 2 | Pos. 193 | Oil Screw | - | |
| 1 | Pos. 68 | Adjusting Nut (Impeller) | - |
Exploded Parts Views
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model / Curve | SEG.40.12.2.50B |
| Rated Power | 1.2 kW (1.6 HP) |
| Voltage / Frequency | 3 x 400-415 V / 50 Hz |
| Rated Current | See Nameplate (Approx. 2.4 - 3.0 A) |
| Discharge Connection | DN 40 (Horizontal Flange) |
| Impeller Type | Semi-open with Grinder |
| Installation Type | Submersible (Auto-coupling or Free-standing) |
Troubleshooting, Common Faults & Solutions
Pump does not start / Fuses blow
Likely Cause: Power supply failure, locked impeller, or cable defect.
Action / Part: Check cable/motor windings and clean the Impeller (Pos. 49)[cite: 1026].
Pump runs but no liquid is delivered
Likely Cause: Outlet valve closed, non-return valve blocked, or air lock.
Action / Part: Clean valves and vent the pump by tilting it[cite: 1042].
Motor protector trips shortly after start
Likely Cause: Impeller clearance incorrect or voltage drop.
Action / Part: Adjust impeller clearance via Adjusting Nut (Pos. 68) or check voltage[cite: 1028].
Below-standard performance
Likely Cause: Wrong direction of rotation or worn grinder.
Action / Part: Swap two phases (if 3-phase) or replace Grinder System (Kit 96076121)[cite: 1040].
Pump is blocked
Likely Cause: The grinder system is worn or jammed.
Action / Part: Replace the Grinder System[cite: 1045].
Online Resources
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