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).
Online Resources
Request for Quotation
Thank you!
Your Request for Quote has been successfully sent.
Our team is reviewing your requirements and will be in touch shortly.
Selected Parts:
- No parts selected