SEEPEX MD Metering Pumps
Spare Parts for SEEPEX MD Progressive Cavity Metering Pumps
Product Summary
Genuine and compatible spare parts for the SEEPEX MD metering pump, the progressive cavity dosing pump used across Australian water and wastewater plants for polymer, coagulant and chemical dosing, from the MD 0005-24 up to the MD 025-6L. Every MD shares the same build (rotor, stator, coupling rod with pin joints, plug-in shaft and packed or sealed shaft), so tick what you need and we’ll match the parts to your nameplate, such as MD 012-12.
Spare Parts List
✓ Tick the parts you need. SEEPEX parts are matched to the pump range, size, rotor/stator geometry, stator elastomer and shaft seal, so the type code and the commission number on your nameplate are 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 | ||
| Minor Set of Wearing Parts | SEEPEX’s minor wear set for the MD: the stator (601). The usual fix when dosing rate has drifted or the pump struggles against line pressure. | |
| Major Set of Wearing Parts | Plug-in shaft, coupling rod, coupling rod pins, guide bushings, universal joint sleeves, holding bands, rotor and stator, from the SEEPEX MD parts list. | |
| Set of Gaskets | Set of packing rings (301), casing gasket (501), sealing rings (571, 726) and O-ring (572). Renew whenever the pump is opened. | |
| Complete Set of Joint Parts (items 401–406) | Coupling rod pins, universal joint sleeves and holding bands for both pin joints. Fit at every rotor/stator change. | |
| Wear & Consumable Parts | ||
| Stator (item 601) | 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, hardened or torn. | |
| Rotor (item 600) | The helical rotor that turns inside the stator. Replace if it is scored, pitted or worn through its coating; a worn rotor will chew out a new stator quickly. | |
| Set of Packing Rings (item 301) | The gland packing set for pumps built with a packed shaft seal. Renew when the gland can no longer be adjusted to a controlled drip, or at every major overhaul. | |
| Pin Joint Grease (item 098) | SEEPEX special joint grease. The manual calls for fresh grease every 10,000 operating hours and at every joint rebuild; SEEPEX specifies its own grease only. | |
| Casing Gasket (item 501) | Seals the stator to the suction casing. Fit a new one every time the stator is changed. | |
| Other Core Parts | ||
| Coupling Rod (item 400) | Carries the drive from the plug-in shaft to the eccentric rotor through a pin joint at each end. Replace if the bores are worn oval, the rod is bent, or corrosion has attacked it. | |
| Plug-in Shaft & Pin (items 307, 309) | The plug-in shaft that connects the drive to the coupling rod and carries the shaft seal. Replace if it is worn or grooved under the seal or damaged at the joint end. | |
| Splash Ring (item 310) | Throws any shaft leakage clear of the drive. Replace if worn or split. | |
| Suction Casing (item 500) | The inlet casing that houses the joints and shaft seal. Replace if eroded, corroded or cracked, matched to your connection standard. | |
| Pressure Branch (item 700) | The discharge end casing that clamps the stator. Replace if worn or cracked, or when changing connection size. | |
| Drive Unit (gearmotor) | The flanged gearmotor (block design) or the separate drive train on bare-shaft builds. Matched to your kW, output speed and mounting so the replacement bolts straight on. | |
| Complete Replacement Pump | When a rebuild doesn’t stack up, we quote a like-for-like SEEPEX MD metering pump from the type code and commission number on your nameplate. | |
How we confirm the exact part: SEEPEX MD parts depend on the size, rotor/stator geometry, stator elastomer, rotor material, joint type and shaft seal fitted to your pump. The item numbers shown are the positions in the SEEPEX parts list; your nameplate carries the type code (e.g. MD 012-12) and the commission number, which together pin down the build. Tick the items above and add a nameplate photo, and we’ll confirm the correct parts for your exact pump.
Models
The MD range comes in six sizes in stainless steel, tie-bolt or synthetic (plastic) designs; the size code after MD on your nameplate (e.g. MD 012-12) identifies the pump.
Models & Key Specifications
| Size | Operating instructions | Joint parts set | Set of gaskets |
|---|---|---|---|
| MD 0005-24 | MD 0015-24 to 012-24 (stainless, tie-bolt or synthetic design) | 401–406 | 301, 501, 571, 572, 726 |
| MD 0015-24 | MD 0015-24 to 012-24 (stainless, tie-bolt or synthetic design) | 401–406 | 301, 501, 571, 572, 726 |
| MD 003-12 | MD 0015-24 to 012-24 (stainless, tie-bolt or synthetic design) | 401–406 | 301, 501, 571, 572, 726 |
| MD 006-12 | MD 0015-24 to 012-24 (stainless, tie-bolt or synthetic design) | 401–406 | 301, 501, 571, 572, 726 |
| MD 012-12 | MD 0015-24 to 012-24 (stainless, tie-bolt or synthetic design) | 401–406 | 301, 501, 571, 572, 726 |
| MD 012-24 | MD 0015-24 to 012-24 (stainless, tie-bolt or synthetic design) | 401–406 | 301, 501, 571, 572, 726 |
| MD 025-6L | MD 0015-24 to 012-24 (stainless, tie-bolt or synthetic design) | 401–406 | 301, 501, 571, 572, 726 |
Range data from seepex.com: 0.06–1,000 l/h, up to 24 bar, dosing accuracy ±1%. MD 0005-24 to 025-6L are on SEEPEX Australia’s fast-delivery list; an MD 012-12 doses polymer at Sydney Water’s West Camden plant.
Troubleshooting
Dosing rate has drifted low
Likely cause: worn stator and rotor letting product slip back, especially against high line pressure, or air drawn in on the suction side. Action: check the suction connection and line for air leaks, recalibrate against a measuring cylinder, and replace the stator (601) and rotor (600) if output is still down.
Stator wears quickly or burns out
Likely cause: dry running, solids or grain size too large for the pump speed, or product temperature too high for the elastomer. Action: fit a new stator, reduce speed or screen the feed, keep the pump full at start-up and fit dry-run protection; SEEPEX also suggests an undersize rotor for hot duties.
Pump hard to turn or will not start after a stator change
Likely cause: stator swollen by an incompatible product, or product that has settled, gummed up or set inside the pump while it stood. Action: check the stator elastomer against the product and select a suitable material; rinse and clean the pump immediately after stopping, and heat it if the product hardens when cold.
Polymer or chemical leaking at the shaft
Likely cause: worn or wrongly adjusted gland packing, or a seal not suited to the chemical. Action: adjust or renew the packing rings (301) and check the packing and O-ring materials suit the chemical being dosed.
Knocking or noise from the suction casing
Likely cause: worn joint parts or too much joint play, often with grease lost through a split joint sleeve. Action: renew the complete set of joint parts with SEEPEX pin joint grease and check the coupling rod bushings are correctly fitted.
Motor runs hot or trips
Likely cause: over-pressure against a closed or blocked discharge, a swollen stator, or worn bearings in the drive. Action: check discharge pressure and motor current, inspect the stator for swelling, and renew the drive bearings if they are rough; fit pressure protection on the discharge.
Request for Quotation
Selected Parts:
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Not sure which parts? Just send a photo of the nameplate or part below.