Mono W Range Pumps
Spare Parts for "Widethroad" W Range Pumps
Spare Parts List
Genuine and compatible spare parts for the Mono Widethroat (W Range) progressing cavity pump — built for the media conventional pumps choke on: dewatered sludge cake, thick pastes and slurries up to 1,000,000 cP. An enlarged rectangular throat with a screw conveyor (plus optional large-diameter auger and bridge breaker) drives low-flowability product into the pumping element. Whatever your frame size or stage, the wear parts are the same by function — tick what you need and we’ll match your exact W-series model from the nameplate.
Common Wear & Service Parts
✓ Tick the parts you need — the same wear parts fit the whole W range by function. Not sure which, or need the exact spec? Add a photo of your pump nameplate and we’ll identify it for your frame size and stage.
| Select | Wear / Service Item | Function & when to replace |
|---|---|---|
| Primary Wear — Pumping Element | ||
| Stator | The primary wear item — choose the elastomer (nitrile / EPDM / natural rubber) to suit your product. Replace with the rotor as a matched set when output drops. | |
| Rotor | Cast iron or stainless, hard-faced options; replace as a matched set with the stator. | |
| Wide Throat — Feed | ||
| Feed Screw / Auger | The screw conveyor that drives cake/paste from the wide throat into the element — replace when worn or bent (poor feed, cavitation). | |
| Bridge Breaker | Optional inlet paddle that stops thick product bridging over the throat; inspect / replace if fitted. | |
| Drive & Coupling | ||
| Coupling / Connecting Rod | Transmits drive to the rotor; replace if worn at the joints. | |
| Coupling Rod Joints | Pin joints with sealing boots at each end of the rod — a common wear point; replace with boots/seals. | |
| Drive Shaft | The plug-in drive shaft; replace if scored or worn at the seal / bearing journals. | |
| Sealing | ||
| Mechanical Seal | For mechanical-seal builds — replace on leakage. (Tell us if your pump runs a packed gland instead.) | |
| Gland Packing Set | For packed-gland builds — repack set with lantern ring. | |
| Shaft Sleeve | Runs under the seal or gland; replace when grooved. | |
| Body & Consumables | ||
| Gaskets / O-Ring Set | Renew whenever the pump is opened for service. | |
| Bearings | Bearing-housing set on bareshaft units; replace on noise or play. | |
| Full Service Kit | Stator + rotor + seal/gland + joints + gaskets as a matched set for a complete rebuild. | |
How we confirm the exact part: the current Mono manuals identify parts by exploded diagram only, so we quote genuine parts against your unit’s model & serial number. Tick the items above and add a nameplate photo — we’ll confirm the correct genuine Mono part, in the right size, material and stage, for your exact pump.
Models
Spare parts are available for every Mono Widethroat W-range frame, in both standard- and large-auger builds. Find your frame code on the pump nameplate.
Standard Auger
Large Auger
Range & Specifications
The W range spans several frame sizes and both single and two-stage builds. Rather than list every code, here is the envelope — your exact W-series model is on the nameplate, and the parts above fit across the range.
| Model coding | W-series (frame size + stage) — your exact code is on the pump nameplate |
| Capacity | Up to 215 m³/h (nominal classes around 1.2, 5.1, 10.2, 17.5 and 28.5 m³/h, scaling up for the larger frames) |
| Maximum pressure | Up to 48 bar (two-stage builds for higher head) |
| Stages | Single or two-stage |
| Build | Monobloc (close-coupled) or bareshaft |
| Inlet / feed | Enlarged rectangular throat + screw conveyor; optional large-diameter auger and/or integral bridge breaker |
| Solids handling | Dewatered cake and pastes up to ~40% dry solids; viscosity to 1,000,000 cP |
| Stator options | Nitrile, EPDM or natural rubber (selected for the pumped product) |
| Rotor / sealing | Cast-iron or stainless rotor; mechanical seal or packed gland |
Troubleshooting
Pump will not run
Likely cause: overload tripped, no power, a seized pumping element, or product jammed in the throat. Action: reset the overload and check the supply; turn the pump by hand to free it; clear the inlet and confirm the feed screw is free.
Reduced or no output
Likely cause: worn stator and rotor, or thick product bridging over the wide throat. Action: replace the stator and rotor as a matched set; make sure the auger / bridge breaker is fitted and undamaged; check for a blocked suction or delivery line.
Product will not feed into the pump
Likely cause (Widethroat-specific): non-flowing cake or paste bridging above the inlet, or a worn feed screw. Action: confirm the screw conveyor / auger and bridge breaker are fitted and in good order; replace a worn or bent feed screw.
Pump runs but will not prime or pump
Likely cause: worn stator / rotor, an air leak on the suction side, or incorrect direction of rotation. Action: confirm rotation (see below), check the suction joints, and inspect the stator, rotor and coupling rod.
Noisy or vibrating
Likely cause: starved suction (viscous product not filling the cavities) or worn coupling-rod joints. Action: slow the pump and improve the inlet feed; inspect and replace the coupling-rod joints and boots.
Leakage at the seal or gland
Likely cause: worn mechanical seal or gland packing, or a grooved shaft sleeve. Action: re-pack or adjust the gland, or replace the mechanical seal and the shaft sleeve.
Rapid stator / rotor wear
Likely cause: dry running, over-pressure, or abrasive solids. Action: never run the pump dry; keep the duty within 48 bar and clear any blocked delivery line.
Direction of rotation (important)
Likely cause: supply phased for the wrong rotation. Action: confirm correct rotation before start-up — running a progressing-cavity pump in reverse can unscrew the rotor and coupling rod and cause damage.
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