Shimano Attachments EW-WU111 (x2)

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.