Crank arm installation

Cranks must be removed from the spindle to service the bottom bracket bearings or to replace the chainrings. Crank pullers are used for the removal of basic three-piece crank types: square-type spindle arms, and splined-type spindle arms.

Square tapered spindles are made with a slight slope or taper. This shape creates a wedge as it is driven into the square hole of the crank. Adequate torque from the crank bolt is typically enough to keep arms from creaking. If a crank creaks even at full torque, remove and grease the pressed surfaces. Cranks used with a loose bolt will result in movement and wear between steel spindle and the sqaure hole the crank.

When the spindle end is no longer recessed inside the hole, the crank bolt can not apply pressure to hold the arm tight on the spindle. A worn crank will need to be replaced. 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. You can improve the accuracy of search results by including phrases that your customers use to describe this issue or topic. Details Scope. Use a small phillips screwdriver to remove the screw securing the battery cover, remove the battery cover, then install the batteries.

Once the batteries are installed, replace the cover and screw. Finally, using a torque wrench with an 8mm allen socket attached, torque the crank bolt to ft-lb Nm. Ensure that the 4iiii Powermeter is up to date. To do this, check that Bluetooth is enabled on the phone then follow the proceeding directions. Android iOS 6. On the next screen, a firmware update prompt should appear if newer firmware is available.

The update procedure will now run.