Burks 21363-5.66 Noryl Impeller 5.66 in for GA5N and GA6N series
This is the genuine Burks noryl impeller at 5.66 in diameter, supplied for GA5N and GA6N series pumps. Everything the pump does at the discharge port starts here. The vanes accelerate liquid outward under centrifugal force, and the volute collects it and converts that speed into head.
Impellers wear from the outside in. Grit and suspended solids scour the vane tips and the shroud faces, the running clearance to the casing opens up, and liquid begins slipping backwards across the vanes instead of being carried round to the discharge. The loss is gradual, which is why it usually goes unnoticed until a tank takes noticeably longer to fill or a pressure gauge stops reaching its old reading.
The diameter is part of the identity of this part. Burks machines the same casting down to several diameters so one pump family can cover a range of duty points and both supply frequencies, so two impellers can drop into the same casing and still give quite different head and flow. Check the diameter against your parts list before ordering, and confirm that your pump is one of the GA5N and GA6N series models.
Key Features
- Genuine Burks replacement impeller in noryl
- 5.66 in diameter - the dimension that sets the duty point
- Direct fit for GA5N and GA6N series 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 GA5N and GA6N series 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: 21363-5.66
- Part Type: Impeller
- Material: Noryl
- Size: 5.66 in diameter
- Fits: Burks GA5N and GA6N series pumps
- Condition: New
Frequently Asked Questions
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.
Q: Can I fit a larger diameter to get more pressure?
Only within what the pump and motor were designed for. A bigger impeller draws more power and can overload the motor, raise the axial thrust on the bearings and push the casing past its rating. Stay with the diameter the pump was built around unless Burks lists the larger one for your exact model.
Q: What else is worth changing while the wet end is open?
The casing gasket or O-ring, because it is already disturbed, and the mechanical seal if the pump has any hours on it. The impeller lock screw and washer are cheap and awkward to reach a second time, so most rebuilders replace those at the same time.
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.
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
