SRAM X7 Crank coming loose...
After downloading the tech manual from the SRAM www I see that there is a lock screw on the left side crank.
After adjusting to SRAMīs specs and a 30 mile ride the crank has come loose for the third time on a new bike (less than a hundred miles)
Anyone have same issues? Is this a warranty claim? If not, is it an excessive grease problem on the 10mm bolt?
Help would be greatly appreciated!
Have you installed it using proper torque and Loctite threadlock?
2015 Kona JTS
2014 Scott Scale 710
2014 Giant Anthem 27.5
2013 DeVinci Leo SL
I haven't taken it apart, the Tech guide does not mention loctite. It has been tightened to 50NM and then adjusted the left side to "hand tight".
If it is not a warranty issue I will take it apart to see if it was greased by accident during the original build.
Following the manual and assuming you're on PF/BB30 cranks:
Thread the bearing preload adjuster all the way on (the plastic collar on the left side)
Install he left arm/spindle
Tap it over lightly with a rubber mallet toward the driveside.
install the driveside spacer
install the right side crankarm, adequate grease on threads and spline surfaces.
Torque right side crankarm bolt with a reliable torque wrench to spec.
now tap the right side crank lightly with a rubber mallet to get the remaining gap consolidated on the non driveside.
Adjust the collar to take up the gap, about another 1/8 turn to add proper preload.
Tighten the collar clamp screw until the split in the collar is closed.
Should hold up fine.
Might be worth re-torquing the driveside after a 10 minute ride around the neighborhood.
Yep thatīs pretty much it!
Originally Posted by rammer
In the last couple of days I have gotten in a really good trail ride, mostly DH but to go down ya gotta go up...
Main point: After about 110 miles no further problems. Will keep thread updated with any further maintenance required.
Best regards and Happy Holidays to all.
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