Description
Left crank Shimano FC-R8000
Left crank Shimano FC-R8000
- This black aluminum left crank is 172.5 mm long, with a Hollowtech II axle interface.
- The left crank is used to position the arm against the frame bearings.
- Clamping the end cap on the left side pulls the crank over the spindle and against these bearings.
- The left arm pinch bolts are then tightened to secure the crank and hold the adjustment.
- There are a few things that can go wrong with a left-hand crank, including stripped or damaged threads on the pedal, causing the pedal to come apart easily.
- The bottom bracket mating hole can be damaged so that it no longer fits properly.
- This can cause a squeaking noise on the power part of the stroke.
- The arm crank may crack, which can be the result of over-tightening and wear on the connection hole.
Repair
- You will need a hex wrench for the pinch bolts, a flathead screwdriver to lift the stop plate, a mallet to install the arm, a torque wrench to tighten the pinch bolts.
- You may also need lubrication for the pins and end cap.
- To remove the crank, you must first remove the pinch bolts on the left crank.
- Next, loosen and remove the cap on the left arm, pull the left arm off the spindle by hand (sometimes you may need to tap lightly with a soft mallet), then remove the arm stop plate and finally, remove the crank. by pulling it to the right and off the bike.
Installation
- Start by greasing the surfaces of the spindle where it engages with the bearings.
- Install the spindle through the right side of the bearings and to the left.
- Sometimes a mallet is needed to gently tap the arm into place.
- Grease the spindle splines.
- Install the left arm 180 degrees from the right arm. Push the stop plate down on the pinch bolt and make sure it is fully engaged in the spindle.
- Grease the threads of the crank cap and screw it into the spindle.
- Tighten the cap gently. If you overtighten the cap, it will push the arms into the bearings, which can cause side loading, resulting in premature bearing wear.
- Tighten the pinch bolts, alternating between them to make sure they are fully and evenly tightened (this is very important).
- Tighten to the manufacturer's recommended torque, which is often specified on the crank.
- Tighten one side until it clicks, then do the same for the opposite side.
- If the adjustment is too loose, you will notice lateral movement of the spindle in the bearings.
