Robbins & Myers 311-9111-000 EPDM Repair Kit for Moyno 500 Pinned 344 Models
This repair kit contains the stator, flexible joint, two shaft pins and shaft seal in EPDM, supplied for the Moyno 500 344 Models built with a pinned rotor, including 34460. 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.
The parts in this kit are the ones that wear, and they wear at roughly the same rate, which is why they are packaged together. Working through them in one strip down costs very little more labor than changing the stator alone and leaves the pump with a full service interval ahead of it rather than a partial one. EPDM is rated for roughly 10 to 210 F, and the elastomer choice should follow the chemistry of the liquid rather than simply repeating whatever was in the pump before. Pinned builds use two shaft pins where the threaded builds use none, so this kit is not interchangeable with the threaded 344 kits.
Key Features
- Genuine Robbins & Myers Moyno repair kit
- Contains the stator, flexible joint, two shaft pins and shaft seal
- EPDM elastomer throughout
- Matched to the Moyno 500 344 Models built with a pinned rotor, including 34460
- Approximate elastomer service range of 10 to 210 F
- Suits both a wear overhaul and an elastomer conversion
- Direct replacement parts, no modification required
Applications
- Moyno 500 344 Models built with a pinned rotor, including 34460 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: 311-9111-000
- Part Type: Pump repair and conversion kit
- Kit Contents: stator, flexible joint, two shaft pins and shaft seal
- Material: EPDM
- Elastomer Service Range: approximately 10 to 210 F
- Fits: Moyno 500 344 Models built with a pinned rotor, including 34460
- Condition: New
- Kit Components: Stator 340-3504-320, flexible joint 320-6973-000, mechanical seal 320-6379-000, two shaft pins 320-4069-002
Frequently Asked Questions
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.
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.
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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