Robbins & Myers 320-6976-000 Nitrile Mechanical Seal for Moyno 301 Series
Part number 320-6976-000 is the genuine Moyno mechanical seal in NBR nitrile for the Moyno 500 301 Series models 30100, 30102, 30104 and 30105. 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.
A weeping seal is a warning rather than an emergency, but it should not be ignored. Liquid tracking along the shaft reaches the bearings, washes out their grease and takes them with it, which turns a small part into a large repair. Fit the seal with clean hands and clean faces, because a fingerprint or a speck of grit on a lapped face is enough to make a new seal leak from the first minute. NBR nitrile is rated to roughly 10 to 160 F in service. The 301 Series pumps use a phenolic body that carries the bearing and drive shaft as one assembly, so seal condition is what protects the whole unit.
Key Features
- Genuine Robbins & Myers Moyno replacement mechanical seal
- NBR nitrile 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 160 F
- Direct replacement with no modification required
Applications
- Moyno 500 301 Series models 30100, 30102, 30104 and 30105 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: 320-6976-000
- Part Type: Mechanical seal, shaft
- Material: NBR nitrile
- Elastomer Service Range: approximately 10 to 160 F
- Quantity Used: One per pump
- Fits: Moyno 500 301 Series models 30100, 30102, 30104 and 30105
- Condition: New
Frequently Asked Questions
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.
Q: What else is worth replacing at the same time?
The shaft slinger and any joint boot nearby, since both are reached on the same strip down and both fail quietly. If the leak went unnoticed for a while, check the bearings for roughness as well.
Q: Does the elastomer compound change how the seal is fitted?
No, the fitting procedure is the same. The compound governs which liquids and temperatures the seal tolerates, which is why the same seal is offered in more than one material under separate part numbers.
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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