Burks 9928-4.63 Bronze Impeller 4.63 in for 20G6-1-1/2 and 320G6-1-1/2
The Burks 9928-4.63 is a bronze replacement impeller measuring 4.63 in diameter, built for 20G6-1-1/2 and 320G6-1-1/2 pumps. It is the rotating heart of the wet end, and its condition sets the ceiling on what the whole pump can deliver.
Two things end an impeller. Abrasive wear rounds off the vane tips and opens the clearance to the casing, so more and more liquid recirculates instead of leaving through the discharge. Cavitation does something different and uglier, collapsing vapour bubbles against the vane surface until the metal looks pitted and eaten away. Both show up as falling flow and a pump that has to run longer for the same result.
Because Burks trims this casting to several diameters to suit different duty points, the size in the part number is not optional detail - it is what separates this impeller from its siblings. Measure the old one across the outside of the vanes if there is any doubt, and check that the pump is a 20G6-1-1/2 and 320G6-1-1/2 model.
Key Features
- Genuine Burks replacement impeller in bronze
- 4.63 in diameter - the dimension that sets the duty point
- Direct fit for 20G6-1-1/2 and 320G6-1-1/2 pumps
- Restores the running clearance that erosion opens up
- Returns flow and discharge pressure toward the original curve
- No modification, machining or rebalancing needed
Applications
- Burks 20G6-1-1/2 and 320G6-1-1/2 pump rebuilds
- Recovering flow and head that have fallen away slowly
- Replacing an impeller with eroded or chipped vanes
- Repairing cavitation pitting on the vane faces
- Restoring balance after a foreign object strike
- Industrial, agricultural, marine and dockside installations
Specifications
- Brand: Burks
- Manufacturer: Crane Pumps and Systems
- Manufacturer Part Number: 9928-4.63
- Part Type: Impeller
- Material: Bronze
- Size: 4.63 in diameter
- Fits: Burks 20G6-1-1/2 and 320G6-1-1/2
- Pump Speed: 3450 RPM
- Condition: New
Frequently Asked Questions
Q: Is a worn impeller worth repairing rather than replacing?
On very large pumps with long lead times, weld build-up and re-machining is sometimes done. At this size it rarely pays. Vane profile and balance both have to be restored properly, and the labour costs more than a new part.
Q: The pump is noisy and vibrates. Could this be the cause?
It can be, especially if a vane has broken or worn unevenly. Before condemning it, rule out a partly blocked suction line, a starved inlet causing cavitation, and worn motor bearings, because all three sound similar from outside the pump.
Q: Does the material matter if I have the right size?
Yes. Bronze is what Burks specified here, and the material sets the corrosion resistance, the stiffness of the vanes and the thermal expansion of the part. Substituting a different material in the same diameter can change both pump life and liquid compatibility.
Q: How do I confirm the diameter on the impeller I have now?
Measure across the outside of the vanes at the widest point with the impeller off the shaft. Burks quotes a nominal size, so a reading a few hundredths under is normal on a part that has seen service and does not by itself mean you have the wrong number.
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 impeller before you order.
CLRMarine
