Burks 9920 Cast Iron Adapter for G6 series
This is the adapter Burks lists as part 9920, for 213JM to 215JM motor frames on G6 series pumps. It is the bracket that makes a close coupled pump possible, locating the casing concentric with the motor shaft and housing the stationary half of the mechanical seal.
Adapters are replaced when the seal bore is worn or corroded, when a mounting face has been damaged, or when threads have pulled out. Because the adapter sets concentricity between the motor shaft and the casing, damage here shows up indirectly - as short seal life, as vibration, or as an impeller that has been rubbing on one side.
Check the register and the seal bore on the new casting before assembly, and clean the motor face properly. This adapter covers 213JM to 215JM motor frames motors on G6 series pumps, and the whole point of it is to hold alignment - which it can only do against clean, undamaged faces.
Key Features
- Genuine Burks replacement adapter
- Cast iron construction as originally supplied
- 213JM to 215JM motor frames - matches the motor frame
- Listed for G6 series pumps
- Holds the casing concentric with the motor shaft
- Houses the stationary half of the mechanical seal
Applications
- Burks G6 series pump rebuilds
- Replacing a seal chamber corroded by a long-running leak
- Repairing damaged mounting faces or pulled threads
- Curing repeated premature mechanical seal failure
- Rebuilding a pump onto a replacement motor
- Industrial, marine and dockside installations
Specifications
- Brand: Burks
- Manufacturer: Crane Pumps and Systems
- Manufacturer Part Number: 9920
- Part Type: Motor adapter
- Material: Cast iron
- Size: 213JM to 215JM motor frames
- Fits: Burks G6 series close coupled centrifugal pumps
- Condition: New
Frequently Asked Questions
Q: Can a pitted seal bore be sleeved instead of replaced?
It is done, but it needs accurate machining to keep the bore concentric with the motor register. Unless the adapter is hard to obtain, a new casting is usually quicker and removes the alignment risk entirely.
Q: What should I check before bolting it up?
Clean both register faces back to bare metal, check the motor shaft for a groove where the old seal ran, and make sure no gasket debris is trapped on the mating surfaces. A thousandth of grit on a register is enough to throw the alignment out.
Q: Does the adapter affect impeller clearance?
It does. The adapter sets the axial position of the casing relative to the motor shaft, so the front clearance at the impeller depends partly on it. That is why gasket thickness at this joint is not something to improvise.
Q: Can I fit this pump to a motor from another manufacturer?
Only if the frame designation and shaft extension match exactly. JM and JP frames are standardised for pump duty, but verify the shaft length and diameter before ordering, since a close match is not the same as the right one.
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 adapter before you order.
CLRMarine
