Grundfos CRN Pumps
Spare Parts for CRN Range Pumps
Product Summary
Genuine and compatible spare parts for the Grundfos CRN vertical multistage pump, the all-316 stainless steel CR used across Australia for seawater and brackish water, RO, chemical dosing and process duties. Every CRN from the CRN 1s to the 200 kW CRN 255 shares the CR build (impeller stack, cartridge shaft seal and standard motor), so tick what you need and we’ll match the exact kit to your nameplate (e.g. CRN 10-6).
Spare Parts List
✓ Tick the parts you need. Grundfos service kits are matched to pump size and stage count, 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 | ||
| Wear Parts Kit | Neck rings, bearing rings, spacing pipes and the small hardware that wears in every CRN. Matched to your stage count. Fit it when flow or pressure drops away or at any rebuild. | |
| Chamber Stack Kit | The complete stage stack (chambers and impellers) for your exact model, e.g. CRN 10-6. The quickest fix for a heavily worn or damaged hydraulic end. | |
| Shaft Seal Kit | Balanced cartridge mechanical seal with its fitting parts (standard HQQV: SiC/SiC/FKM; other faces and elastomers to order). Replace at the first sign of leakage at the pump head. | |
| Gasket Kit | Sleeve O-rings, flange gaskets and plug seals in FKM (standard on CRN) or EPDM. Renew whenever the pump is opened. | |
| Ball Bearing Kit | Bearing kit for the pump end where fitted (larger CRN sizes), including the thrust handling parts fitted to the big CRN models. We confirm the fit from your nameplate. | |
| Other Core Parts | ||
| Impellers | Individual impellers, with hub nut and split cone on the larger sizes. Replace if eroded, cracked or loose on the shaft. | |
| Coupling Kit | Connects the motor to the pump shaft. Replace if worn, cracked or slipping (noise, vibration). | |
| Replacement Motor | Standard Grundfos motor matched to your kW and frame size, from 0.37 to 200 kW across the range. | |
| Pump Head / Base | Top cover, motor stool or base with inlet and outlet, matched to your connection type (Flexi-clamp or flanged). | |
| Outer Sleeve & Staybolts | The pressure sleeve and tie bolts that clamp the stack, sized to your stage count. | |
| Plug & Air Vent Kit | Priming, vent and drain plugs with O-rings. | |
| Complete Replacement Pump | When a rebuild doesn’t stack up, we quote a like-for-like CRN from the model on your nameplate. | |
How we confirm the exact part: Grundfos CRN kits depend on pump size, stage count, shaft seal code and connection. Your nameplate carries all of it, in the model (e.g. CRN 10-6 A-FGJ-G-V-HQQV) and the product number. 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 CRN size in the current Grundfos Australia range. The number after the dash on your nameplate (e.g. CRN 10-6) is the stage count.
Models & Key Specifications
| Size | Stages | Motor (kW) | Connections | Max. pressure |
|---|---|---|---|---|
| CRN 1s | 2–36 | 0.37–1.1 | Flexi-clamp (Rp 1) / DN25–32 flanged | 16 bar clamp · 25 bar flanged |
| CRN 1 | 2–36 | 0.37–2.2 | Flexi-clamp (Rp 1) / DN25–32 flanged | 16 bar clamp · 25 bar flanged |
| CRN 3 | 2–36 | 0.37–3 | Flexi-clamp (Rp 1) / DN25–32 flanged | 16 bar clamp · 25 bar flanged |
| CRN 5 | 2–36 | 0.37–5.5 | Flexi-clamp (Rp 1 1/4) / DN25–32 flanged | 16 bar clamp · 25 bar flanged |
| CRN 10 | 1–22 | 0.37–7.5 | DN40 flanged | 25 bar |
| CRN 15 | 1–17 | 1.1–15 | DN50 flanged | 25 bar |
| CRN 20 | 1–17 | 1.1–18.5 | DN50 flanged | 25 bar |
| CRN 32 | 1–14 | 1.5–30 | DN65 flanged | 16–30 bar (by stage count) |
| CRN 45 | 1–13 | 3–45 | DN80 flanged | 16–33 bar (by stage count) |
| CRN 64 | 1–8 | 4–45 | DN100 flanged | 16–30 bar (by stage count) |
| CRN 95 | 1–12 | 5.5–90 | DN100 flanged | 16–25 bar (by stage count) |
| CRN 125 | 1–12 | 11–132 | DN150 flanged | 16–25 bar (by stage count) |
| CRN 155 | 1–11 | 11–160 | DN150 flanged | 16 bar and up (by stage count) |
| CRN 185 | 1–8 | 18.5–200 | DN200 flanged | 16–40 bar (by stage count) |
| CRN 215 | 1–7 | 22–200 | DN200 flanged | 16–40 bar (by stage count) |
| CRN 255 | 1–6 | 30–200 | DN200 flanged | 16–40 bar (by stage count) |
All sizes: liquid temperature −20 °C to +90 °C (−30 °C on CRN 95 and CRN 125, −40 °C on CRN 155), standard shaft seal HQQV cartridge (SiC/SiC/FKM), IP55 motors, 50 Hz. Thrust handling device factory fitted on larger motors (75 kW and up on CRN 155). Cast iron version: see Grundfos CR; 304 stainless: see Grundfos CRI.
Troubleshooting
Pump will not start
Likely cause: no supply, a tripped motor protection or fuse, or a seized pump. Action: check the supply and reset the protection; with the power isolated, turn the shaft by hand at the coupling. A pump that won’t turn needs inspection of the impeller stack and seal.
Motor protection trips repeatedly
Likely cause: overload from a worn or rubbing stack, a failing motor bearing, a phase fault, or running well off the duty curve. Action: check the voltage on all phases and the motor current; inspect the stack and bearings; confirm the duty point suits the model.
Low flow or pressure
Likely cause: worn wear parts (neck rings and bearing rings), air in the pump, a blocked strainer, or wrong rotation. Action: vent the pump through the priming plug; clean the suction strainer; confirm rotation; if output still falls short, replace the wear parts kit or the chamber stack kit.
Noise or vibration
Likely cause: cavitation (insufficient inlet pressure), air in the pump, a worn coupling, or worn motor bearings. Action: check NPSH and inlet pressure; vent the pump; inspect the coupling and replace if worn; check the motor bearings.
Leaking at the shaft seal
Likely cause: worn or damaged seal faces, often from dry running or abrasive particles. Action: replace the cartridge shaft seal kit and renew the O-rings. Never run a CRN dry: the seal relies on the pumped liquid for cooling.
Pump runs backwards after stopping
Likely cause: a leaking or missing non-return valve on the discharge. Action: repair or replace the non-return valve. Reverse spin can damage the seal and coupling.
Leaking at the pump body
Likely cause: perished sleeve O-rings or flange gaskets, or loose staybolts. Action: fit the gasket kit and torque the staybolts evenly to Grundfos specification.
Request for Quotation
Selected Parts:
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Not sure which parts? Just send a photo of the nameplate or part below.