AMT 1640-161-92 Mechanical Seal - Buna-N Type 6A

The AMT 1640-161-92 is a Mechanical Seal, Buna-N, Type 6A, size 5/8 Inch for an AMT Cast Iron Centrifugal Pedestal Pump. IMPORTANT: Always replace both seal seat and seal head to insure proper mating of components! Also, impeller seal should be replaced anytime impeller fastener has been removed. 1. Remove fasteners connecting casing to pedestal . 2. _Remove casing and casing seal .A CAUTION Care should be taken not to "pinch" or "shave" casing seal between pedestal and casing. 3. Use a box and/or socket wrench to remove impeller fastener. Remove impeller seal and impeller . Seal seat can now be pried from impeller. IMPORTANT: Care should be taken to insure that same number and thickness of shim washers are replaced behind impeller as was removed. Shim washers are located directly behind impeller and become loose as impeller is removed. 4. To free shaft assembly , see Bearing Housing Service. 5. After shaft assembly is removed, press seal head from _pedestal.A CAUTION The precision lapped faces on mechanical seal are easily damaged. Handle your replacement seal carefully. Do not touch polished seal faces. IMPORTANT: Be sure that shaft shoulder does not damage polished seal face. 6. Thoroughly clean all surfaces of seal seat cavity in pedestal and impeller. 7. While wearing clean gloves or using a clean light rag, press seal head squarely into pedestal recess, use cardboard washer , place over polished surface and use a piece of pipe or dowel rod to press in firmly, but gently. Avoid scratching polished face. 8. Dispose of cardboard washer. Check again to see that polished surface is free of dirt and all other foreign particles and that it has not been scratched or damaged. 9. Wet rubber portion of new seal seat with a light coating of soapy water. While wearing clean gloves or using a clean light rag, press seal seat squarely into impeller recess, use cardboard washer , place over polished surface and use a piece of pipe or dowel rod to press in firmly, but gently. Avoid scratching polished face. NOTE: A short "run-in" period may be necessary to provide completely leak free seal operation. 10. Replace any shim washers which may have been removed in disassembly. 11. Screw impeller back in place, tightening until it is against shaft shoulder. Install impeller seal and impeller fastener. 12. Remount casing seal and casing on pedestal. IMPORTANT: Always inspect casing seal whenever unit is disassembled. Replace when cracked or worn. IMPORTANT: After pump is completely assembled it is necessary to rotate pump shaft by hand to check for striking of impeller. If striking or rubbing occurs, adjust impeller shims as required .