Grundfos SL1 Pumps
Spare Parts for SL1 Range Pumps
Product Summary
Genuine and compatible spare parts for the Grundfos SL1 closed S-tube sewage pump, used across Australia in council sewage pump stations, stormwater and industrial wastewater duties, built for submerged installation in wet wells. Every SL1 from the 0.9 kW SL1.50.65 to the 26.5 kW SL1.80.100 shares the same service build (closed channel impeller, mechanical shaft seal and sealed, sensor-protected motor), so tick what you need and we’ll match the exact kit to your nameplate (e.g. SL1.80.80.22.4.50B).
Spare Parts List
✓ Tick the parts you need. Grundfos SL1 service kits are matched to the hydraulic size, motor and build, so your nameplate model is all we need to get them right. Not sure which items? Add a photo of the nameplate and we’ll work out the kit for you.
| Select | Wear / Service Item | Function & when to replace |
|---|---|---|
| Common Service Kits | ||
| Shaft Seal Kit | Mechanical shaft seal kit (stationary and rotating parts, retaining ring, O-rings and spring washer) for your pump size; the 9–30 kW pumps use a double seal set. Replace at the first moisture alarm or if water shows in the oil. | |
| Impeller Kit | The closed S-tube impeller with its fixing parts, matched to your model and kW (e.g. SL1.80.80 at 5.5 kW). Replace if worn, cracked or eroded; the small 0.9–1.5 kW SL1.50.65 uses a single-channel impeller. | |
| Wear & Seal Ring Kit | The wear ring and seal ring on the suction side that set the impeller clearance. Replace when flow drops off or the pump starts ragging more than it used to. | |
| O-ring & Gasket Kit | O-rings and gaskets for the pump housing, oil chamber and plugs. Renew whenever the pump is opened. | |
| Cable Kit | Replacement power and sensor cable (10 m standard on 0.9–11 kW, 15 m on 9–30 kW; other lengths and screened cable for VSD use to order) with the cable entry seals. Fit if the cable is cut, crushed or wicking water. | |
| Sensor Kit | Moisture switch, motor thermal switches or thermistors, and the water-in-oil (WIO) sensor on sensor-version (“A”) pumps. Replace a failed sensor so the pump stays protected. | |
| Other Core Parts | ||
| Auto-Coupling & Guide Rail Fittings | Auto-coupling base, guide claw and upper guide rail brackets, matched to your discharge size (DN65–DN200). | |
| Lifting Chain | Lifting chain and shackles sized to the pump weight. Always lift by the chain, never the cable. | |
| Oil Chamber Oil | Fresh oil for the oil chamber at every seal change or inspection. Water or emulsified oil means the shaft seal has failed. | |
| Motor / Stator Service | Motor bearings, stator rewind or a replacement motor unit matched to your kW, poles and voltage code. | |
| Level Controller | Grundfos LC level controller for one or two pumps, with the level switches or transmitter to suit your well. Matched to your motor size and starting method. | |
| Complete Replacement Pump | When a rebuild doesn’t stack up, we quote a like-for-like SL1 from the model on your nameplate. | |
How we confirm the exact part: Grundfos SL1 kits depend on the free passage, discharge size, motor power and poles. The model reads type, free passage (mm), discharge (DN), kW × 10, poles and voltage code, e.g. SL1.80.100.40.4.50B = 80 mm solids, DN100, 4 kW, 4-pole; 9–30 kW pumps add the range and hydraulic code (e.g. SL1.85.100.150.4.52H). Tick the items above and add a nameplate photo, and we’ll confirm the correct part and price for your exact pump.
Models
Spare parts are available for every SL1 size in the current Grundfos Australia range, and for earlier generations from the nameplate. The first number after SL1 is the free passage in mm; the second is the discharge size (e.g. SL1.80.100).
Models & Key Specifications
| Model group | Motor (kW) | Poles | Discharge | Free passage |
|---|---|---|---|---|
| SL1.50.65 (small) | 0.9–1.5 | 2 | DN65 | 50 mm |
| SL1.50.65 | 2.2–4 | 2 | DN65 | 50 mm |
| SL1.50.80 | 2.2–4 | 2 | DN80 | 50 mm |
| SL1.80.80 | 1.5–7.5 | 4 | DN80 | 80 mm |
| SL1.80.100 | 1.5–7.5 | 4 | DN100 | 80 mm |
| SL1.100.100 | 4–7.5 | 4 | DN100 | 100 mm |
| SL1.100.150 | 4–7.5 | 4 | DN150 | 100 mm |
| SL1.75.100 | 13–18.5 | 2 | DN100 | 75 mm |
| SL1.80.100 (52S) | 20–26.5 | 2 | DN100 | 80 mm |
| SL1.85.100 / .150 | 10–18.5 | 4 | DN100 / DN150 | 85 mm |
| SL1.95.100 / .150 | 20–22 | 4 | DN100 / DN150 | 95 mm |
| SL1.110.200 | 10–22 | 4 | DN200 | 110 mm |
All sizes: submerged installation (no cooling jacket), liquid temperature 0 °C to +40 °C, 50 Hz. 0.9–7.5 kW: 3 × 400–415 V DOL, pH 4–10, thermal switches to 3 kW, thermistors from 4 kW and a moisture switch; SL1.50.65 is explosion-proof as standard. 10–26.5 kW: 3 × 380–415/660–690 V, pH 6.5–14, moisture switch, leakage switch and PTC thermistors, explosion-proof on request. Dry-install version: see Grundfos SE1; SuperVortex: see Grundfos SLV.
Troubleshooting
Pump blocked or ragging
Likely cause: rags and wipes caught on the impeller leading edge, or an opened-up clearance between the impeller and the wear ring. Action: isolate the power, lift the pump and clear the inlet and impeller; check and reset the impeller clearance and replace the wear ring if it is worn. Frequent ragging on a worn pump is the usual sign a wear ring kit is due.
Moisture alarm or leaking at the shaft seal
Likely cause: worn seal faces letting water into the oil chamber, often from grit, dry running or age; the moisture switch (or WIO sensor) trips the pump before the motor floods. Action: check the oil in the seal chamber: water or emulsified oil means the seal has failed. Fit the shaft seal kit, renew the O-rings and refill with fresh oil. Don’t reset and run on a moisture alarm.
Thermal trip or overheating
Likely cause: an overload from a blocked or worn impeller, a phase fault, too many starts per hour, or the pump running uncovered and losing its cooling. Action: check the voltage on all phases and the motor current against the nameplate; clear the hydraulic end; check level settings so the pump stays submerged. Repeated trips need a motor inspection.
Low flow or head
Likely cause: wrong rotation, air trapped in the pump, a partly blocked discharge or non-return valve, or wear at the impeller and wear ring. Action: check rotation on three-phase pumps; vent the pump and clear the discharge, valve and auto-coupling; if output still falls short, replace the worn hydraulic parts.
Noise or vibration
Likely cause: solids caught in the impeller, a damaged impeller, worn motor bearings, or the pump not seated properly on the auto-coupling. Action: clear and inspect the impeller; check that the pump sits fully on the auto-coupling base and the guide rails are straight; worn bearings need a motor overhaul.
Pump will not start
Likely cause: no supply, a tripped motor protection, a failed level switch, or a seized pump. Action: check the supply, controller and level switches and reset the protection; with the power isolated, check the impeller turns freely. A seized pump needs inspection of the hydraulic end and bearings.
Damaged cable or water in the cable entry
Likely cause: a cut, crushed or chafed cable from lifting or debris, or a perished cable entry seal. Action: isolate the pump and test the insulation resistance; never splice a submersible cable in the well. Replace the cable kit and cable entry seal, and lift the pump by its chain, never the cable.
Request for Quotation
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Not sure which parts? Just send a photo of the nameplate or part below.