Burks 9917 Mechanical Seal 1.250 in Shaft
The Burks 9917 is the genuine Burks mechanical shaft seal for a 1.250 in shaft, built in Carbon, ceramic and Buna-N, for G6 and G9 series pumps on 182JM to 215JM motor frames pumps. It is the part that stops pumped liquid escaping where the rotating shaft passes out of the wet end, and it does that with two flat faces held together - one turning with the shaft, one fixed in the housing.
Seals fail from heat, from abrasion and from chemical attack on the elastomer. The faces themselves are tough, but they depend on a liquid film that a dry run destroys instantly. Once the faces are heat-checked or scored, lapping them is not practical at this size, and the seal is replaced as an assembly.
Handle the faces as though they were optical parts, because that is effectively what they are. Keep them clean, do not touch the lapped surfaces, and never lever the seal into place. The Carbon, ceramic and Buna-N build here fixes the chemical and temperature limits, so match the material as carefully as the size.
Key Features
- Genuine Burks mechanical shaft seal assembly
- 1.250 in shaft - matches the original shaft dimension
- Carbon, ceramic and Buna-N construction
- Listed for G6 and G9 series pumps on 182JM to 215JM motor frames pumps
- Spring loaded and self-adjusting as the faces wear
- Supplied complete - rotating face, seat and elastomers
Applications
- Burks G6 and G9 series pumps on 182JM to 215JM motor frames pump rebuilds
- Curing a persistent drip from behind the pump casing
- Recovery after a dry run or a lost prime
- Replacing seal faces scored by grit or abrasives
- Planned maintenance on duty and standby pumps
- Industrial, marine and dockside pump installations
Specifications
- Brand: Burks
- Manufacturer: Crane Pumps and Systems
- Manufacturer Part Number: 9917
- Part Type: Mechanical shaft seal
- Material: Carbon, ceramic and Buna-N
- Size: 1.250 in shaft
- Fits: Burks G6 and G9 series pumps on 182JM to 215JM motor frames
- Condition: New
Frequently Asked Questions
Q: Should anything else be changed at the same time?
Check the shaft or sleeve where the elastomer grips it. A groove worn at the old seal position will chew the new boot in short order. The casing joint seal is also worth renewing, since it has to come off to reach the seal anyway.
Q: How long should a mechanical seal last?
Years on clean liquid with a flooded suction. Life falls sharply with abrasives, with frequent starts on a starved inlet, and with temperatures near the top of the elastomer rating. Most premature failures trace back to operating conditions rather than the seal itself.
Q: A few drops appear when the pump first starts. Is that normal?
A very light initial weep while the faces bed in can settle within an hour or so of running. A steady drip, or anything that continues beyond that, means the faces are not seating and the seal needs to come back out.
Q: How do I know the seal is what is leaking?
A shaft seal leak shows up as liquid finding its way out around the shaft behind the casing, often worst just after shutdown. A joint gasket leaks along the split line between castings and does not change with shaft rotation.
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.
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