NETZSCH NEMO MY Pumps
Spare Parts for NEMO MY Magnetically Coupled Pumps
Product Summary
Genuine and compatible spare parts for the NETZSCH NEMO MY, the hermetically sealed progressive cavity pump with a magnetic coupling in place of a shaft seal, used across Australia for toxic, aggressive and hazardous chemicals, paints, battery materials and mining reagents where nothing may leak. Every MY from the NM005 to the NM053 shares the same build (rotor, stator, coupling rod or joints, and the magnetic drive), so tick what you need and we’ll match the exact parts to your nameplate, such as NM031MY.
Spare Parts List
✓ Tick the parts you need. NEMO MY wear parts are matched to pump size, stator elastomer and the coupling rod or joint fitted, so the full model code on your nameplate is all we need to get them right. Not sure which items? Add a photo of the nameplate and we’ll work it out for you.
| Select | Wear / Service Item | Function & when to replace |
|---|---|---|
| Common Service Kits | ||
| Stator | The elastomer-lined pumping element and the part that wears most. Replace when flow or pressure drops away, after any dry run, or if the elastomer has swollen or hardened. | |
| Rotor | The helical rotor that turns inside the stator. Replace if the surface is worn, scored or pitted; a worn rotor will chew out a new stator quickly. | |
| Flexible Coupling Rod | The wear-free flexible rod fitted to MY pumps for duties up to 80 °C without chemical resistance demands. Replace if cracked, kinked or attacked by the product. | |
| Joint Service Parts | The set of joint wear parts for MY pumps built with a B or K joint (for higher temperatures and aggressive media): pins, bushes, sleeves and clamps. Fit at every rotor/stator change. | |
| Gasket & O-ring Set | Stator gaskets and housing O-rings, including the seals on the magnetic coupling housing. Renew whenever the pump is opened to keep it hermetically sealed. | |
| Other Core Parts | ||
| Magnetic Coupling | The NETZSCH magnetic coupling that transmits torque through a sealed wall with no shaft penetration. Replace a magnet rotor if it is damaged, corroded or has lost torque (slipping). | |
| Containment Shell | The sealed shell between the inner and outer magnets that keeps the product in. Replace if scored, worn or damaged; never run the pump with a damaged shell. | |
| Bearings | The bearings that carry the drive and magnet rotors. Replace if noisy, running hot or showing play, before they let a magnet rotor rub the shell. | |
| Suction Housing | The inlet casing that holds the coupling rod or joints. Replace if eroded, corroded or cracked. | |
| Pressure Branch | The discharge end casing that clamps the stator. Replace if worn or cracked, or when changing connection size. | |
| Gearmotor | The geared drive that runs the MY at its low operating speed. Matched to your kW, output speed and flange. | |
| Complete Replacement Pump | When a rebuild doesn’t stack up, we quote a like-for-like NEMO MY from the model code on your nameplate. | |
How we confirm the exact part: NEMO MY parts depend on pump size, stator elastomer, rotor material, whether a flexible coupling rod or a B/K joint is fitted (the 2024 version offers both) and the magnetic coupling size. Your nameplate carries the model code (e.g. NM031MY followed by the geometry and joint code) and the serial number. Tick the items above and add a nameplate photo, and we’ll confirm the correct parts for your exact pump.
Models
Spare parts are available for each NEMO MY size NETZSCH publishes; the three digits after NM on your nameplate (e.g. NM031MY) are the pump size.
Models & Key Specifications
| Size | Max. pressure | Capacity (m³/h) | Speed (rpm) |
|---|---|---|---|
| NM005 | 36 bar | 0.004 – 0.007 | 500 |
| NM008 | 18 bar | 0.01 – 0.026 | 500 |
| NM011 | 12 bar | 0.03 – 0.07 | 500 |
| NM015 | 12 bar | 0.1 – 0.2 | 400 |
| NM021 | 12 bar | 0.15 – 0.4 | 300 |
| NM031 | 12 bar | 0.4 – 1.2 | 300 |
| NM038 | 12 bar | 1.0 – 3.8 | 300 |
| NM045 | 12 bar | 2.0 – 7.0 | 300 |
| NM053 | 12 bar | 4.0 – 10.0 | 300 |
All sizes: hermetically sealed magnetic coupling (no mechanical seal, no sealing fluid or external services), viscosities up to 20,000 cP, ATEX compliant; flexible PA12 coupling rod up to 80 °C or B/K joint for hotter or aggressive media. Further sizes on request.
Troubleshooting
Stator wears quickly or burns out
Likely cause: dry running (even for a few seconds), too high a liquid temperature for the elastomer, or abrasive solids at too high a speed. Action: fit a new stator (and rotor if scored); never start the pump empty, fit dry-run protection such as a stator temperature sensor, and confirm the elastomer and speed suit the duty.
Pump stops delivering but the motor keeps running
Likely cause: the magnetic coupling has decoupled (slipped) because the torque needed exceeded its rating: over-pressure, a blocked discharge, a swollen or new tight stator, or very high viscosity at start. Action: stop the drive, clear the cause and check the discharge pressure, then restart. Repeated decoupling can overheat and weaken the magnets, so inspect the coupling and stator.
Low flow or loss of pressure
Likely cause: worn rotor and stator, air drawn in on the suction side, a blocked suction line, or speed too low. Action: check the suction line and seals for air leaks and blockages and confirm the speed; if output is still down, replace the stator (and the rotor if its coating is worn).
Pump hard to turn or trips on start after a stator change
Likely cause: stator swelling from an elastomer that is not compatible with the product or cleaning chemicals, or high break-away friction in a new tight stator. Action: check the elastomer against the product and its temperature; fill the pump before start-up (a little glycerine on a new stator helps); if the stator has swollen, replace it in a compatible elastomer.
Noise or heat at the magnetic coupling
Likely cause: worn bearings letting a magnet rotor rub the containment shell, or solids built up in the coupling area. Action: stop the pump at once, replace the bearings and inspect the containment shell; a scored shell must be replaced before the pump goes back into hazardous service.
Coupling rod failure
Likely cause: the flexible PA12 rod run above 80 °C or attacked by an aggressive product, or worn joints on B/K joint builds. Action: replace the rod or joint parts, and if the duty is hot or chemically aggressive, change to the B or K joint version.
Damage after a blocked or closed discharge
Likely cause: over-pressure: a positive displacement pump keeps building pressure against a closed valve or blockage until something fails. Action: measure the actual discharge pressure against the nameplate rating, clear the blockage, inspect the stator, joints and seal, and fit a pressure relief or pressure switch on the discharge.
Request for Quotation
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Not sure which parts? Just send a photo of the nameplate or part below.