Square Spindles Bracket and Bottom Bracket Maintenance

Cranks and bottom brackets can be tricky to handle.  Maintaining those key components might require a bit of extra help and/or a bit of encouragements.  Here are two step by step procedures to make this a bit more simple.

A. Crank Arms Removal

1. Optionally, remove the pedals while the crank arms are on the bike if you're replacing them.
2. Remove the center bolt caps on both left and right crank arms.
3. Unscrew the crank arm 8 mm nuts ( counterclockwise ) on both sides
4. Remove left crank arm with the puller (CCP-22 for square type spindles, see link below for other types)
5. Remove right arm with puller but note that the RIGHT side thread in the crank is INVERTED so the puller's washer goes in counterclockwise.

B. Bottom Bracket Removal
1. With the bike out of any stand and wheels on the ground. For English thread cups (68 or 73 mm), with a 20-tooth splined bottom bracket cups tool ( eg BBT-22 or X-Tools BB Tool for UN26, UN54, UN55, BB7420, or see link below for other types ) : untighthen COUNTERCLOCKWISE the LEFT side first. If it's locked too tight (not everybody's got a torque wrench) you might need a clamp or adjustable wrench .
2. With the BB tool, loosen the right side. The RIGHT side thread holding the BB is INVERTED therefore turn CLOCKWISE to loosen it.
3. Once both side are loosened, remove completely, clean up, inspect for damages and lubricate generously both the BB and the frame with grease.

Usefull Parktool Links :
Crank Puller For Square Taper 
Crank Installation and Removal Square Spindle Type
Crank Installation and Removal ISIS or Octalink
Bottom Bracket Tool Selection