This video covers the disassembly and servicing of the older BCS SingleAction "Dry" (greasebased) type drive unit (also called "gearbox", but this is a misnomer on a sickle bar, since there are no "gears" in the drive assembly).
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TIMESTAMPS
00:00 Disassembly & Gearbox Anatomy
05:50 Removing Yolk Assembly
07:30 Greasing
10:00 Disassembling Yolk
12:30 Reassembly
13:30 Swivel Assembly