To know the service options you will need to know the type of crank and type of bottom bracket bearing system installed in the bicycle. On self-extracting crank systems, the crank puller is effectively built into the crank.
Self-extracting systems use threaded rings that look similar to a crank dust cap. However, these crank retaining rings are threaded over the crank bolt, so that when the crank bolt is loosened the shoulder of the bolt presses back against the ring, which in turn slowly pushes the arm from the spindle. No additional crank removal tools are required. Self-extracting systems exist in both two-piece and three-piece form.
These have a left crank arm with a compression slot that is secured by two pinch bolts and a right crank arm with an integrated spindle. These systems use external bearing cups and do not need a conventional crank puller. The left side crank is removed to get to the bearings or to remove the right crank. With this system, both the left and right crank arms are fitted with one-half of the spindle system, with teeth machined into each spindle end.
Instead, the bearings are mounted onto the cranks. This washer is used to account for variations in frame shell widths and effectively acts as the bearing adjustment. The parts of the three-piece crankset are the left arm, right arm, and axle spindle. The spindle is held in position by bearings in the frame. The right side has C-clip that must be removed before the bearing can be pulled.
A small, flat tipped screwdriver can be worked under the edge on the clip to pry it free from the groove in the spindle. Work the C-clip up and off the spindle. The CBP-8 uses a bearing puller consisting of two fingers to engage the bearing and a driver to pull it upward. Arrange the bearing puller assembly over the spindle. Use the side knobs to snug the fingers under the bearing. Use a wrench to turn the driver clockwise.
This pushes the tool plunger against spindle end and pulls the fingers and bearing away from the crank. Install any crank seals that were removed. Grease the pressed surfaces and place a new bearing on the spindle.
Engage C-clip over the right spindle end. Use bearing driver to push by hand until clip engages groove in spindle. The cranks with bearings are now pushed back into the cups. Align cranks straight. Trade Resources. What Tools do I need? Remove retaining clip from cup Remove the crank bolt.
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