Roper Pump G40-41 Ball Bearing
The Roper G40-41 is a ball bearing of the kind used at the outboard position on a gear pump drive shaft. That bearing does a job the internal sleeve bearings cannot: it takes the external radial load from a belt drive, chain drive or coupling, and it absorbs the axial thrust that a helical gear set generates as it works. Without it, every one of those loads would be carried by the journal bearings that are supposed to be supporting the pumping gears alone.
An outboard bearing gives plenty of warning before it fails. It gets warm, it gets noisy, and end float appears at the shaft that was not there before. The trouble is that by the time the noise is obvious, the shaft has usually already started to move enough to load the shaft seal unevenly, which is why a bearing change so often turns into a seal change as well. Check shaft end float at every service, renew the bearing on condition rather than waiting for the noise, and fit it with a driver that bears on the correct race so the balls never carry the pressing load.
Key Features
- Genuine Roper Pump Company ball bearing, part number G40-41
- Carries external radial load from belt, chain or coupling drives
- Absorbs the axial thrust generated by helical pumping gears
- Keeps the drive shaft located so the shaft seal is loaded evenly
- Renewable on condition as part of a planned pump service
Applications
- Outboard drive shaft bearing service on gear pumps
- Belt and chain driven pump packages
- Coupled pump and motor installations
- Rebuild work where shaft end float has appeared
- General industrial and transfer pump maintenance
Specifications
- Brand: Roper Pump Company
- Part Number: G40-41
- Part Type: Ball bearing
- Function: Supports external radial load and absorbs axial thrust at the drive shaft
- Installation: Press on the correct race so load never passes through the balls
- Service Note: Manufacturer fitment is not published for this bearing, so confirm it against your own pump parts list
- Condition: New
Frequently Asked Questions
Q: How do I check shaft end float?
Mount a dial indicator against the shaft end and lever the shaft gently back and forth. Compare what you measure against the figure in your service instructions rather than judging it by feel.
Q: Can I heat the bearing to fit it?
Induction or oil bath heating to a moderate temperature is a standard method and is far kinder than pressing. Keep it well below the point that would affect the hardness of the races.
Q: Why did a new bearing run hot straight away?
Usually over-packing with grease, or a housing fit that is too tight and has pinched the outer race. Both show up within minutes of the first run.
Q: Does belt tension affect bearing life?
Substantially. An over tensioned belt drive puts a constant side load on the shaft, and the outboard bearing absorbs all of it. Setting the tension to specification is the cheapest bearing life extension there is.
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 ball bearing before you order.
CLRMarine
