This particular crank is a Ultegra 6800 34x50
Be sure that the pressfit and bearing surfaces are clean and lubricated.
Use proper lubrication, I prefer Motorex grease made for this purpose.
Be sure to clean the inside of the crankarm mount. Any grit inside will wear and tear the surface and can cause premature failure. Notice the protruing plastic tabs, indicates that the safetypin is not actuated.
Observere the safety pin inside the mount
The pin lock onto the hole in the crankshaft when the plastic lever is depressed.
Push the crankshaft through the pressfitt bearing until it stops. There is a o-ring on the crankarms that must touch the pressfitt bearing sides that will create a seal to block out grit and water.
Install the left crankarm and the preload cap.
Depress the plastic tab to activate the safetypin.
Use preload cap tool to tighten, handtighten only. To tight and the pressfit bearing will wear out early and will bind during use. To check, rotate the crank by hand to feel any binding, and if, loosen until it feels fine.
Observe the recommended amount of torque to by use on the pinch bolts. Getting this correct is critical for getting a long lifetime out of the crank. The sticker says 12-14Nm.
Use a proper torque spammer that allows for setting the correct amount. I set it to 13Nm and tighten each screw evenly until I hit the correct amount. Do not tighten one screw fully and then the other, that would create excessice wear on one side of the mount and to little on the other side.
Done. Go biking.
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