AMT 1640-161-90 Mechanical Seal - Buna-N/Carbon/Ceramic Type 16

The AMT 1640-161-90 is a Mechanical Seal, Buna-N/Carbon/Ceramic, Type 16, size 5/8 Inch for an AMT Pump. MECHANICAL SEAL REPLACEMENT
1. Disassemble the bearing housing and gasket from the pump casing by removing the 4 hex head cap screws . 2. Unscrew the impeller, . 3. Carefully pry up on the seal cartridge using two large screwdrivers. Often, this portion of the seal can be removed by pulling off with your fingers. 4. Remove the shaft bearing assembly by first removing the snap ring and shims. Push the shaft bearing assembly out of the bearing housing by tapping on the threaded end of the shaft with a rawhide mallet or block of wood and hammer. As shaft is being pulled from the housing, the shaft slinger between the seal and the bearing will fall free. 5. Pry the seal seat from the cavity in the bearing housing. 6. Replace shaft bearing assembly by sliding the assembly into the housing, threaded shaft first. As shaft end emerges from bearing cavity before it enters into seal cavity, slip the rubber slinger washer up from the underside, over the end of the shaft. Some manipulation through the seal cavity opening may be required. Push shaft bearing assembly home by gently tapping on keyway end of shaft with a rawhide mallet. Replace snap ring and shims. 7. Carefully wipe the surface of the ceramic seat with a clean cloth. 8. Wet the rubber portion of the ceramic seat with a light coating of soapy water. 9. Press the seal seat squarely into the cavity in the bearing housing. If the seal seat does not press squarely into the cavity, it can be adjusted in place by pushing on it with a piece of pipe. NOTE: Always use a piece of cardboard between the pipe and the seal seat to avoid scratching the seal seat. This is a lapped surface and must be handled very carefully. 10. After the seal is in place, be sure that the face is clean and has not been scratched or cracked. 11. Using a clean cloth, wipe the shaft and make sure that it is perfectly clean. 12. Apply a light coating of soapy water on the inside of the rubber drive ring inside the seal cartridge assembly. Slide the seal assembly onto the shaft , sliding the rubber drive ring just up over the shaft shoulder. Do not touch or wipe the seal head. 13. Replace any shim washers you may have removed in disassembly. 14. Screw the impeller back in place, tightening until it is against the shoulder provided on the shaft. 15. Replace pump casing on the bearing housing, using a new gasket to prevent leakage. Turn shaft by hand to ensure free rotation. If striking of the impeller on the pump casing is noted, disassemble and remove shim washers as required.