CBP-5 Crank and Bearing Adaptor Set for Service of Campagnolo Power Torque Cranks
This article will review the service of the Campagnolo® Power-Torque™ crank system. The Park Tool CBP-5 Crank and Bearing Adaptor Set includes:
- Bearing removal adapter
- Extension plug
- Bearing installation tool
- Fiberboard pads
- Molded pad
Figure 1. The Park Tool CBP-5 bearing adapter set
The Power-Torque™ crank uses a spindle integrated into the drive side crank. The left side crank is removed to get to the bearings or to remove the right crank.
The removal of the Power-Torque™ crank is reviewed in the following video:
The removal of the aluminum Power-Torque™ cranks:
1. Remove the clip from the drive side bearing cup (figure 2). The spindle cannot be removed with this clip in place.
Figure 2. Remove clip from right side bearing cup
2. Remove crank bolt using a 14mm hex wrench (figure 3).
Figure 3. Remove crank bolt with a 14mm hex wrench such as the HR-14
3. Slide the plastic molded pad on to the crank. Install the extension plug into the spindle (figure 4).
Figure 4. Install mold over crank and install extension plug
5. Engage the puller from the CBP-3 set over the molded pad. Align puller and use knob to remove play from the puller fingers (figure 5). Ends of puller fingers should engage the recess behind the mold (figure 6). There should be no play between finger and puller body.
Figure 5. Install puller over extension stud and remove play from fingers
Figure 6. Correctly positioned finger ends in pad recesses
6. Tighten handle of puller to pull arm from spindle.
7. Remove puller, mold, and extension plug from from left arm.
Figure 7. Left arm lifting free of spindle
8. Pull crank to the drive side and remove it from the bike.
The Power Torque carbon and aluminum left side arms are different in shape (figure 8). Only the aluminum arm uses the molded pad. The back of the carbon arm is flat and provides good engagement with the fingers of the puller. Use only the fiberboard pads to prevent any cosmetic marking of the arm. If you run out of pads, use the pad card as a template and cut new pads from any cardstock or thin cardboard.
Figure 8. On the left, the curved radius of the aluminum arm. On the right, the flatter backside of the carbon arm.
The procedure to remove the carbon left arm:
1. Remove crank bolt from left arm.
2. Install one fiberboard pad, extension plug, and puller (figure 9 and 10).
Figure 9. Fiberboard installed behind carbon arm
Figure 10. Install extension plug and puller
3. Adjust puller knobs until play is removed from finger (figure 11). Finger ends should engage crank on flat section.
Figure 11. Adjust knobs on puller to remove excessive play at fingers
4. Turn handle to pull arm from spindle (figure 12).
Figure 12. Carbon lifted off spindle
Bearing Removal and Installation
Bearing removal and installation is reviewed in this video:
The drive side bearing is pressed to the spindle. There is a C-clip that must be removed before pulling this bearing. The aluminum and carbon arms share the same service feature for bearing removal and replacement.
The procedure for crank bearing removal and installation:
1. Use a screwdriver and work the clip up and off the spindle (figure 13).
Figure 13. Carefully work free the C-clip on the drive side crank
2. Install the bearing remover adapter on the crank (figure 14). Install adapter aligned with the arm of crank. Push adapter until fully engaged.
Figure 14. Install adapter below bearing
3. Install puller and engage fingers into arms of adapters. Adjust knobs of puller to remove play in puller (figure 15).
Figure 15. Adjust puller fingers onto bearing adapter
4. Tighten handle of puller to lift adapter and bearing from crank. Inspect the puller and adapter are lifting evenly and not twisting. Readjust as necessary.
5. Install new seal and bearing on crank spindle. Place crank on smooth workbench, and place bearing installer over spindle. Use a hammer to drive bearing fully into place (figure 16).
Figure 16. Drive bearing fully onto spindle with repeated impacts
6. Crank is ready to install.
The left side bearing is pressed into the cup. It is Campagnolo's intention that this entire cup with bearing should be replaced when bearing is worn out.
Both the aluminum and carbon cranks share the same installation procedure.
1. Install crank through right side bearing.
2. Install C-clip into pin holes of right side cup.
3. Install pre-load spring and seal cover over left side bearing.
4. Grease splines of crank. Grease threads of crank bolt.
5. Align crank to point 180-degree opposite of drive side arm and install on spline of crank.
6. Install crank bolt and secure to manufacturer's recommended torque.