Roper Pump G4-397 Complete Buna Mechanical Seal for A Series 06 to 40
The Roper G4-397 is a complete Buna mechanical seal for A Series gear pumps in the 06 through 40 displacement sizes. A Series pumps are the compact close coupled and foot mounted machines in the Roper range, built to run at standard motor speeds with cast iron housings, hardened steel shafts, ductile iron gears and bronze journal bearings, and rated up to around 300 pounds per square inch. On that kind of pump the shaft seal is often the only serviceable item between the product and the motor, which makes it the part worth getting right.
Supplied complete, the seal arrives as a matched set rather than as a face looking for a seat, which matters because the two are lapped to work together. The Buna elastomer covers the fuel, lubricating oil and general clean liquid duties these pumps normally see. On a close coupled A Series pump take particular care with the shaft extension during assembly, since the seal has to pass over it without the secondary elastomer being nicked on a keyway edge or a snap ring groove. A wrap of thin tape over the sharp edge during fitting, removed before the pump is closed, prevents a leak that is otherwise almost impossible to diagnose afterwards.
Key Features
- Genuine Roper Pump Company mechanical seal, part number G4-397
- Supplied complete with matched rotating assembly and stationary seat
- Buna elastomer for fuel, lubricating oil and general clean liquid duty
- Fits A Series gear pumps in the 06 through 40 displacement sizes
- Leak free shaft sealing with no running adjustment needed
Applications
- A Series gear pumps in the 06 through 40 sizes
- Pressure lubrication and bearing oil supply
- Fuel supply, day tank and boiler feed systems
- Tank battery recirculation and fuel additive dosing
- Close coupled and foot mounted transfer packages
Specifications
- Brand: Roper Pump Company
- Part Number: G4-397
- Part Type: Mechanical seal, complete
- Elastomer: Buna
- Fits: A Series gear pumps, sizes 06 through 40
- Pump Family: A Series, cast iron housings with ductile iron gears and bronze journal bearings, rated to roughly 300 pounds per square inch
- Condition: New
Frequently Asked Questions
Q: How do I read an A Series figure number?
The leading digits give the mounting and whether a relief valve is fitted, the letter pair gives the shaft sealing method, and the digits after that give displacement in gallons per one hundred revolutions.
Q: My A Series pump is close coupled. Does the motor have to come off?
Usually yes, since the seal sits behind the pump head on the motor shaft extension. Support the motor before you separate them so nothing hangs on the shaft.
Q: Can a lip sealed A Series pump take this seal?
Not without the matching sealing parts. The sealing code in the figure number tells you which arrangement the pump was built with, and each takes its own components.
Q: What is the most common cause of early failure on these small pumps?
Running them dry. A small pump primes quickly and is often started before the suction line has filled, and the seal takes the damage in the first few seconds.
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.
CLRMarine
