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Pin removal

550b can't remove crank pin to properly lube, only one nut comes, off the other just spins the shaft

The crank has holes so you can use a needle fitting on a grease gun to squirt lube into the pin. The pin has a spiral groove machined onto it to hold grease. Generally no need to tear it apart to grease it.
Otherwise, you must drop the ram, and remove the upper pivot pins in order to disassemble the crank.

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