Question about Skymaster landing gear system

[Skymaster337B]

There is an internal locking mechanism inside the nose gear actuator. It can only be released by hydraulic pressure. That’s assuming it was set correctly. The small jam-nut at the end of the actuator rod is all that keeps the internal rigging set correctly. It’s a good design but also intolerant of faulty settings and lack of understanding of its operating principles.

I always check that internal lock when it’s on jacks. Manually push the nose gear down (into locked position) and listen to “click” of it locking. Then check the external down lock hooks ensuring the pins are fully seated.