Grundfos SL1.50.65.15.4.50B Pump
Spare Parts for SL1.50.65.15.4.50B Wastewater Pump
Product Summary
The Grundfos SL1.50.65.15.4.50B is a 1.5 kW submersible sewage pump featuring an S-tube® impeller with a 50mm free passage. Designed for the transfer of domestic and municipal wastewater, this 4-pole (low speed) unit ensures reliable handling of solids with minimal clogging. Its robust cast iron construction and clamp-connected motor housing allow for easy maintenance and long service life.
- S-tube® Impeller: Tube impeller design offers high hydraulic efficiency and large 50mm free passage to prevent clogging.
- SmartTrim System: Patented axial adjustment mechanism allows easy restoration of factory clearance to maintain peak efficiency.
- Cartridge Shaft Seal: Double mechanical seal unit (Position 105) allows for fast replacement in the field without special tools.
- Watertight Cable Plug: Polyurethane-filled stainless steel cable plug (Position 1) prevents water ingress into the motor windings.
- Clamp Connection: A stainless steel clamp (Position 92) secures the motor to the pump housing, enabling 360° rotation and tool-free disassembly.
Spare Parts List
| Select | Qty | Part Number | Description | Material / Spec |
|---|---|---|---|---|
| 1 | 96102360 | Shaft Seal Complete (BQQP) | NBR / SiC-SiC | |
| 1 | 96102361 | Shaft Seal Complete (BQQV) | FKM / SiC-SiC | |
| 1 | 96102365 | O-Ring Service Kit (SL1.50) | NBR | |
| 1 | 96833633 | Impeller Complete (SL1.50.65) | Cast Iron | |
| 1 | 96102362 | Shaft with Rotor (1.1-1.5 kW) | Steel / Copper | |
| 1 | 96102363 | Lifting Bracket & Screw | Stainless Steel | |
| 1 | 96586753 | Oil (1 Litre) | Paraffinic Oil | |
| 1 | Pos. 92 | Clamp (Motor/Pump) | Stainless Steel | |
| 1 | Pos. 50 | Pump Housing (Volute) | Cast Iron (EN-GJL-250) | |
| 1 | Pos. 105 | Shaft Seal Unit | Cartridge | |
| 1 | Pos. 1 | Cable Plug Assembly | Polyurethane | |
| 2 | Pos. 193 | Oil Screw | Steel | |
| 1 | Pos. 68 | Adjusting Nut (SmartTrim) | Steel |
Exploded Parts Views
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model / Curve | SL1.50.65.15.4.50B |
| Rated Power | 1.5 kW (2.0 HP) |
| Voltage / Frequency | 3 x 400-415 V / 50 Hz |
| Rated Current | See Motor Nameplate |
| Discharge Connection | DN 65 (Flange) |
| Impeller Type | S-tube® (50mm Free Passage) |
| Installation Type | Submersible (Auto-Coupling or Free-Standing) |
Troubleshooting, Common Faults & Solutions
Pump does not start
Likely Cause: Power supply failure, motor cutout, or locked impeller.
Action / Part: Check fuses/cable and inspect Impeller (Pos. 49) for clogging.
Motor trips shortly after start
Likely Cause: Low voltage, phase failure, or incorrect impeller clearance.
Action / Part: Adjust impeller via SmartTrim (Pos. 68) or check electrical phases.
Pump runs but flow is low
Likely Cause: Impeller clogged, outlet valve closed, or wrong rotation.
Action / Part: Clean Pump Housing (Pos. 50) or swap power phases.
Pump vibrates or is noisy
Likely Cause: Impeller imbalance, worn bearings, or wrong installation.
Action / Part: Check Impeller (Pos. 49) or reinstall using Clamp (Pos. 92).
Water in the oil chamber
Likely Cause: Shaft seal failure.
Action / Part: Replace Shaft Seal Kit (96102360).
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