Sealed Cartridge Bottom Bracket Disassembly/Assembly

How to overhaul/service a Shimano sealed cartridge bottom bracket. I take it apart, clean, lube, replace the ball bearings and re-assemble it. This unit is a Shimano BB-TY30. But I think many, if not most Shimano sealed cartridge bottom brackets are built in the same way. The socket I use is a 13/16 inch deep 6pt socket. It is basically a spark plug socket. A 21mm 6pt socket will probably also work. There were twelve 7/32" ball bearings and eighteen 5/32" ball bearings. I used marine grease.
Here is a video rebuilding a bottom bracket with sealed cartridge bearings:
• Overhaul/Rebuild Botto...
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