Roper Pump D11-277 Bearing Retainer Gasket for N41 Gear Reducers
The Roper D11-277 is the bearing retainer gasket used in the N41-1 and N41-3 built-on gear reducers, the units that let a gear pump run straight off a standard speed motor while the pumping gears turn at the slower speed a heavy or viscous liquid needs. The gasket sits under the retainer that holds the reducer shaft bearing in place. It seals the oil in and sets the small axial gap that decides how much end float the shaft is allowed.
Gear reducer housings are graded by how dry they stay. A weeping bearing retainer is easy to dismiss as a nuisance drip, but the oil that escapes is the oil that was carrying heat away from the gear mesh, and a reducer that has run low leaves witness marks on the tooth flanks long before it makes any noise. Renew this gasket any time the retainer comes off, check the retainer face for burrs raised by a puller, and refill to the level mark rather than by feel. A gasket costs a fraction of a set of reducer gears.
Key Features
- Genuine Roper Pump Company bearing retainer gasket, part number D11-277
- Listed for both the N41-1 and the N41-3 gear reducer families
- Seals the bearing retainer joint so reducer oil stays in the housing
- Sets the axial gap that controls shaft end float at the retainer
- Single use item renewed whenever the retainer is disturbed
Applications
- N41-1 built-on gear reducers for the 11, 17 and 22 pump sizes
- N41-3 built-on gear reducers for the 35, 48 and 58 pump sizes
- Gear reduced pump packages driven by standard speed electric motors
- Viscous liquid transfer where the pump must be turned slowly
- Scheduled reducer service and oil leak repair
Specifications
- Brand: Roper Pump Company
- Part Number: D11-277
- Part Type: Bearing retainer gasket
- Fits: N41-1 and N41-3 gear reducers
- Function: Oil seal at the bearing retainer joint and end float shim
- Assembly: Gear reducer mounted directly on the pump head
- Condition: New
Frequently Asked Questions
Q: How do I tell an N41-1 reducer from an N41-3?
They are sized to the pump they were built onto. The N41-1 family serves the smaller 11, 17 and 22 frames and the N41-3 family serves the larger 35, 48 and 58 frames. The pump plate is the quickest way to settle it.
Q: Can I leave the retainer bolts slightly loose to stop the gasket crushing?
No. A retainer that is not pulled down evenly will let the bearing walk under load, and the shaft will find the play as a knock. Torque it properly and let the gasket do the sealing.
Q: What oil level should the reducer be filled to?
Use the level plug or sight glass on your reducer rather than a measured amount, and check it with the unit cold and level. Overfilling drives oil past the seals just as surely as a bad gasket does.
Q: Is it worth changing the shaft seal at the same time?
Usually yes. The retainer has to come off to reach it either way, so replacing the seal while the housing is open avoids a second teardown a few months later.
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 bearing retainer gasket before you order.
CLRMarine
