Introduction: If you are experiencing difficulty removing the key when the door is locked or unlocked, there may be a problem with the lock positioning. In this article, we will provide a more detailed explanation of how to diagnose and fix this issue, focusing on two likely causes: the stop (4) is installed incorrectly, or the cam (6) is obstructed.
Steps to Diagnose and Fix Key Removal Issues:
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Disassemble the lock mechanism: To diagnose the issue, first remove the small nut (8) at the back of the lock. Next, take off the lock tab (7), cam (6), and stop (4).
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Test the lock: With the lock mechanism disassembled, turn the key. The lock should rotate 360 degrees, and the key should be removable at three positions, corresponding to the three indents (or grooves) inside the shell. If this occurs, it confirms that the lock itself is functioning correctly and the installation is causing the problem.
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Reassemble the lock with correct indents: Find the two indents where the key can be removed and the cam points in the desired directions. Position the stop (4) on the back so that the key still turns the cam in the two directions you want, and the key can be removed in both positions.
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Reattach the cam, lock tab, and nut: Put the cam (6) back on, followed by the lock tab (7) and the small nut (8). Tighten the nut securely.
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Test the reassembled lock: If, after reassembling, the key still cannot be removed in either position, the cam (6) is likely hitting something, preventing it from rotating the full 90 degrees.
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Adjust the cam: Identify where the cam is obstructed and either bend or grind it slightly to allow for full rotation.
Important Note for Aircraft Locks: For some aircraft, the lock is specifically designed not to release the key when the baggage/panel is unlocked, particularly when it is located in the nose of the aircraft. This is a safety feature to prevent accidental opening during flight. Ensure that you are aware of the specific lock design on your aircraft before attempting any adjustments.
By following these steps, you should be able to diagnose and fix any issues related to key removal in door locks. Always exercise caution when working with locks and consult a professional locksmith if you are unsure about any part of the process.