Robbins & Myers 320-6380-000 EPDM Mechanical Seal for Moyno 500 Model 356
Part number 320-6380-000 is the genuine Moyno mechanical seal in EPDM for the Moyno 500 Model 356. It is the barrier between the wet end and everything behind it, and it is the component that decides whether a pump drips or stays dry.
The seal is normally renewed whenever the wet end is opened, because it is inexpensive next to the labor of reaching it and because a used seal rarely beds down properly a second time. Check the shaft itself while the seal is out: a groove worn where the old seal ran will cause the new one to leak however carefully it is fitted. EPDM gives an approximate service range of 10 to 210 F.
Key Features
- Genuine Robbins & Myers Moyno replacement mechanical seal
- EPDM elastomer
- Lapped face design lubricated by the pumped liquid
- Keeps pumped liquid away from the bearings and drive end
- Approximate elastomer service range of 10 to 210 F
- Direct replacement with no modification required
Applications
- Moyno 500 Model 356 progressing cavity pumps
- Curing a leak or weep at the shaft where it leaves the pump body
- Routine renewal whenever the wet end is opened
- Rebuilding a pump after a dry running incident
- Changing elastomer compound to suit a different liquid
- Industrial, marine, dockside and washdown installations
Specifications
- Brand: Robbins & Myers
- Manufacturer: Robbins & Myers (Moyno)
- Manufacturer Part Number: 320-6380-000
- Part Type: Mechanical seal, shaft
- Material: EPDM
- Elastomer Service Range: approximately 10 to 210 F
- Quantity Used: One per pump
- Fits: Moyno 500 Model 356
- Condition: New
Frequently Asked Questions
Q: The shaft has a visible groove. Can the seal still be used?
Not reliably. A new seal running in an old groove will leak, because the faces cannot follow the step. The shaft needs replacing, or in some builds a shaft sleeve or a repositioned seal is the accepted fix.
Q: A new seal leaked straight away. What usually causes that?
Three things account for most cases: a fingerprint or particle on one of the lapped faces, a groove worn into the shaft where the old seal ran, or the seal being pushed on dry so the elastomer rolled instead of sliding. Clean faces, a checked shaft and a little water on the elastomer solve nearly all of them.
Q: How much weeping is acceptable on this type of seal?
A trace of dampness while a new seal beds in over the first few hours of running is normal. A steady drip is not, and a seal that is still dripping after bedding in should be investigated rather than tightened.
Q: Can the pump be run briefly without liquid to check rotation?
A few seconds to confirm direction does little harm, but anything longer runs the faces dry and heat checks them. If a longer test is needed, flood the wet end with a compatible liquid first.
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 mechanical seal before you order.
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