Robbins & Myers 320-1750-000 Nitrile Mechanical Seal for Moyno 500 Model 367
Part number 320-1750-000 is the genuine Moyno mechanical seal in NBR nitrile for the Moyno 500 Models 36701 and 36751. 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.
Shaft seals fail for reasons that are usually visible once the pump is open. A dry run burns the faces and leaves them crazed or heat checked. Abrasive liquid scores them. An incompatible liquid attacks the elastomer, leaving the boot or O-ring swollen, hardened or cracked, and once the elastomer stops flexing the faces cannot stay in contact. NBR nitrile covers an approximate service range of 10 to 160 F, which is the first thing to check against the liquid before choosing a replacement.
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 Models 36701 and 36751 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: 320-1750-000
- Part Type: Mechanical seal, shaft
- Material: NBR nitrile
- Elastomer Service Range: approximately 10 to 160 F
- Quantity Used: One per pump
- Fits: Moyno 500 Models 36701 and 36751
- Condition: New
Frequently Asked Questions
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.
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.
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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