How to Troubleshoot a John Crane Seal
- 1). Review the mechanical conditions of the shaft if you find that the seal is wearing out the pump. Ensure that the shaft is straight and check the squareness of the stuffing box face to the shaft center line.
- 2). Check that the flush line is clear and the flush port is as close to the face of the seal as possible, if you find that the seal is burned-out.
- 3). Insert an abrasives or filter into the flush line if you find that the seal is worn out. This will prevent dirt, rust or abrasive particles contained in the pumped liquid from accumulating in the seal cavity.
Source...