Robbins & Myers 311-9031-000 Nitrile Repair Kit for Moyno 500 Model 344
Part number 311-9031-000 is the genuine Moyno repair kit in NBR nitrile for the Moyno 500 344 Models built with a threaded rotor, containing the stator, flexible joint and shaft seal. These are the components that decide whether the pump holds pressure, and they are the ones reached once the wet end is open.
A conversion kit is also the usual way to move a pump onto a different liquid. Elastomer compatibility rather than mechanical wear is what limits many installations, and changing the soft parts is far cheaper than changing the pump. NBR nitrile covers an approximate range of 10 to 160 F in service. Check the rotor condition while the pump is open, because a rotor with worn plating will abrade the new stator quickly and is not included in a kit of this type. The joint supplied in this kit is the carbon steel type; the 316 stainless equivalent for the same pumps is ordered separately.
Key Features
- Genuine Robbins & Myers Moyno repair kit
- Contains the stator, flexible joint and shaft seal
- NBR nitrile elastomer throughout
- Matched to the Moyno 500 344 Models built with a threaded rotor
- Approximate elastomer service range of 10 to 160 F
- Suits both a wear overhaul and an elastomer conversion
- Direct replacement parts, no modification required
Applications
- Moyno 500 344 Models built with a threaded rotor progressing cavity pumps
- Full wet end overhaul of a pump that has lost pressure and flow
- Converting a pump to a different elastomer for a new liquid
- Rebuilding after a dry running incident
- Planned maintenance on metering and transfer duties
- Industrial, marine, dockside and washdown installations
Specifications
- Brand: Robbins & Myers
- Manufacturer: Robbins & Myers (Moyno)
- Manufacturer Part Number: 311-9031-000
- Part Type: Pump repair and conversion kit
- Kit Contents: stator, flexible joint and shaft seal
- Material: NBR nitrile
- Elastomer Service Range: approximately 10 to 160 F
- Fits: Moyno 500 344 Models built with a threaded rotor
- Condition: New
- Kit Components: Stator 340-3504-120, carbon steel flexible joint 320-1511-000, mechanical seal 320-2424-000
Frequently Asked Questions
Q: Does the kit include the rotor?
No. Kits of this type cover the soft parts and the drive components listed, not the rotor. The rotor is ordered separately when inspection shows worn plating, scoring or flatted crests on the helix.
Q: How long does a wet end overhaul usually take?
On the smaller Moyno 500 pumps it is a bench job of an hour or two once the pump is isolated and drained. Most of the time goes on drawing the stator off and easing the new one back on rather than on the rest of the kit.
Q: Do I need special tools to fit it?
Ordinary hand tools cover most of the work. A means of supporting the rotor while the stator is drawn off helps, and a compatible lubricant on the rotor makes the new stator far easier to assemble.
Q: Can this kit be used to change the elastomer on a pump that is not worn out?
Yes, that is one of its intended uses. If the liquid has changed and the existing compound is not suited to it, converting the soft parts is far cheaper than replacing the pump.
Not sure this is the right part? Send us a Picture of the pump plate on your pump and the CLR Marine team will confirm the correct repair kit before you order.
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