Robbins & Myers 311-9057-000 Fluoroelastomer Repair Kit for Moyno 500 Model 344
This repair kit contains the stator, flexible joint and shaft seal in FPM fluoroelastomer, supplied for the Moyno 500 344 Models built with a threaded rotor. The same kit serves two purposes. It is the standard overhaul package for a worn pump, and it is the route to converting a pump from one elastomer to another when the liquid being handled has changed.
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. FPM fluoroelastomer covers an approximate range of 10 to 240 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. This is the fluoroelastomer build of the same kit, supplied with a 316 stainless joint rather than the carbon steel one used in the nitrile version.
Key Features
- Genuine Robbins & Myers Moyno repair kit
- Contains the stator, flexible joint and shaft seal
- FPM fluoroelastomer elastomer throughout
- Matched to the Moyno 500 344 Models built with a threaded rotor
- Approximate elastomer service range of 10 to 240 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: 311-9057-000
- Part Type: Pump repair and conversion kit
- Kit Contents: stator, flexible joint and shaft seal
- Material: FPM fluoroelastomer
- Elastomer Service Range: approximately 10 to 240 F
- Fits: Moyno 500 344 Models built with a threaded rotor
- Condition: New
- Kit Components: Stator 340-3504-520, 316 stainless flexible joint 320-4670-000, mechanical seal 320-6501-000
Frequently Asked Questions
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.
Q: What should be inspected while the pump is apart?
The rotor surface, the bearings for roughness, the shaft for a groove where the seal ran, and the housing bore for scoring. All four are quick to check and all four affect how long the new parts last.
Q: Is there anything to do differently on first start up after a rebuild?
Flood the wet end before starting so the new stator and seal are never run dry, confirm the direction of rotation, and run against an open discharge for the first minute before loading 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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