AMT 1640-165-90 Mechanical Seal - Viton/Silicon Carbide Type 21

The AMT 1640-165-90 is a Mechanical Seal, Viton/Silicon Carbide, Type 21, size 5/8 Inch for an AMT Pump. MECHANICAL SEAL REPLACEMENT
Should the mechanical seal, which consists of seal seat , seal cartridge , and shaft sleeve require replacement, proceed as follows and refer to Figures 1 and 2. The seal should also be replaced if the adapter is to be replaced. NOTE: Always replace the seal seat, seal cartridge, and shaft sleeve to ensure proper mating of mechanical seal components! 1. Unthread bolts and remove casing from adapter. 2. Unthread screw and remove volute from adapter. 3. 316A-95 and 316B-95 : Remove impeller lock nut . Unscrew impeller from the motor shaft. Use a rubber mallet or soft block of wood to loosen impeller. Turn it counterclockwise. Remove the impeller shim and seal cartridge . 4. 393A-95, 393B-95, 394A-95, 394B-95, 394C-95, 394D-95, and 399A-95 : Using an Allen wrench, remove the impeller lock bolt and o-ring . Slide impeller off motor shaft. Remove the impeller shim , shaft sleeve and seal cartridge . IMPORTANT: Care should be taken to ensure that the same number of impeller shims are replaced behind the impeller as were removed. These impeller shims are located directly behind impeller. These shims as well as the impeller key become loose as the impeller is removed. 5. Unthread cap screws and remove adapter from motor. 6. Push seal seat from the adapter recess with a screwdriver. 7. Clean adapter recess before inserting a new seal seat. The precision lapped faces on the mechanical seal are easily damaged. Handle your replacement seal carefully. 8. Carefully wipe the polished surface of the new seal seat with a clean cloth. 9. Wet rubber portion of the seal seat with a light coating of soapy water. 10. While wearing clean gloves or using a clean rag, press seal seat squarely into adapter recess. Avoid scratching the polished surface. If seal seat will not position properly, place a cardboard washer over the polished surface and use a piece of pipe to press in, firmly but gently. 11. After seal seat is in place, dispose of cardboard washer. Check that seat is clean and has not been marred. 12. Using a clean cloth, wipe the shaft and make certain that it is perfectly clean. 13. Secure the adapter on the motor mounting surface with fasteners. 14. Wet the inside rubber portion of the new seal cartridge with a light coating of soapy water. 316A-95 and 316B-95: Slide cartridge onto motor shaft until cartridge meets seal seat. 393A-95, 393B-95, 394A-95, 394B-95, 394C-95, 394D-95 and 399A-95: Slide cartridge onto shaft sleeve. Slide shaft sleeve with seal cartridge onto motor shaft until cartridge meets seal seat. Reinstall impeller key. IMPORTANT: Before installing new shaft sleeve, apply a bead of nonhardening, pliable sealant to motor shaft shoulder. 15. Reinstall any impeller shims that have been removed. . 16. 316A-95 and 316B-95: Screw impeller back in place, tightening until it is seated against shims and shaft shoulder. 393A-95, 393B-95, 394A-95, 394B-95, 394C-95, 394D-95 and 399A-95: Replace impeller key, impeller, o-ring and impeller lock bolt. Tighten lock bolt until impeller is seated against shims and shaft sleeve. 17. Remount volute with fasteners. 18. Refer to section entitled Shim Adjustment at this time if shaft sleeve or any other parts listed have been replaced. 19. Inspect position of flapper valve to ensure proper movement and sealing. 20. Replace o-ring seal on volute rabbet. NOTE: Always inspect o-ring seals. Replace when cracked or worn. Wet o-ring with soapy water for ease of assembly. 21. Remount casing. 22. Remount any other parts and reconnect power.