AMT 1640-161-91 Mechanical Seal - Viton/Carbon/Ceramic Type 16

The AMT 1640-161-91 is a Mechanical Seal, Viton/Carbon/Ceramic, Type 16, size 5/8 Inch for an AMT Pump. MECHANICAL SEAL REPLACEMENT
Always replace both seal seat and seal head to ensure proper mating of mechanical seal components! NOTE: It is not necessary to remove piping from pump casing. The motor and impeller assembly are removed from back of casing. 1. Drain pump before disassembling. Unscrew pipe plug to drain most of liquid; some will be left in bottom. 2. Unthread hex nuts and remove pump casing and o-ring from casing cover . 3. To unscrew impeller , turn counterclockwise facing impeller. Unscrew acorn nut and o-ring gasket before unscrewing impeller. NOTE: A screwdriver slot or two flats for use with an open end 7/16 wrench are provided at rear of motor shaft . To hold motor shaft from turning, either insert a large screwdriver blade into the slot, or use a 7/16 wrench across the flats. 4. Unthread cap screws and remove motor adapter . Seal head and impeller shims will come loose at this time. NOTE: Casing cover will still be attached to motor adapter. IMPORTANT: Retain impeller shims for use when reassembling unit. 5. Push seal seat from casing cover with screwdriver. 6. Clean adapter recess before inserting a new seal seat. 7. Carefully wipe polished surface of new seal seat with a clean cloth. 8. Wet outside of rubber portion of seal seat with a light coating of soapy water. 9. Press new seal seat squarely into cavity in casing cover. If seal seat does not press squarely into cavity, it can be adjusted into place by pushing on it carefully with a piece of pipe or dowel. Always use a piece of cardboard between pipe and seal seat to avoid scratching seal seat. . 10. After seal seat is in place, be sure that it is clean and has not been marred. 11. Using a clean cloth, wipe shaft and make certain that it is perfectly clean. 12. Carefully guide motor shaft through seal seat. Secure motor adapter on motor mounting face. 13. Apply a light coating of soapy water to inside rubber portion of seal head and slide onto shaft so that rubber portion is just up over shaft shoulder. Do not touch or wipe face of polished part of the seal head. 14. Replace any impeller shims which may have been removed in disassembly . 15. Screw impeller back in place, tightening until it is against shaft shoulder. Replace o-ring gasket and acorn nut. 16. Remount o-ring and pump casing on casing cover. IMPORTANT: Always inspect o-ring gasket for cracks or cuts when unit is disassembled. Replace if damaged.