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How to fix a u-lock that is stuck or jammed

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How to fix a u-lock that is stuck or jammed

Old 01-02-16, 08:43 PM
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CompleteStreets
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How to fix a u-lock that is stuck or jammed

1. Squirt a few drops of machine oil, Tri-flow, or bicycle lube in the hole where the bolt of the u-lock is (opposite the key hole).

2. Turn the key back and forth, locking and unlocking about a dozen times.

3. Enjoy a like-new u-lock.

Video: https://www.youtube.com/watch?v=lswE5ubw9G4

Blog post: Troubleshooting U-Lock Key Failures: https://bikeumd.wordpress.com/2012/1...-key-failures/
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Old 01-02-16, 08:59 PM
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Gresp15C
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Just a side note. If the lock is stuck because of water freezing inside it, oil won't get in there, but alcohol will. On my winter bike, I'm carrying a tiny jar of alcohol, at least until I experience enough rides in varying weather to know that I don't need it.
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Old 01-02-16, 09:03 PM
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Good tip. The oil method is mainly for semi-stuck u-locks that are annoying to unlock, not those that are seized and impossible to open. Alcohol sounds good for a frozen u-lock. WD40 may be an option for a seized lock, just to loosen things up. After that, a thicker oil is good for maintenance.
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Old 01-03-16, 03:36 PM
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For sub-freezing conditions you spray and work the lock with graphite spray before the freezing starts.

Silicone lubricant is your second best choice, not WD40. Actually silicone lubricant is a good trick to prevent the rubber seals from sticking to the door in your German-engineered car!
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