[MOC REVIEW] Grove GMK6400 Mobile Crane

[efferman]

Actually i see no option. 

[Seideno]

Has anyone managed to replace the Efferman actuator with lego? I'm stuck in the build and lack imagination :(

[Kladovec]

Hi there, I have/had Efferman actuator, but few months ago I rebuild it to this custom Lego one - operated via small winch and XL motor. Superstructure must be rebuilded. 

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[Seideno]

Thank you for your advice Kladovec . I've attached the design that I recreated from your photos, but I don't know if it's correct :)
I'm going to continue the model in free time.

https://www.dropbox.com/scl/fi/nznxbtzotblxjiap9i2hi/actuator.io?rlkey=t9ivjns1fvtuiyez18035pniw&st=k2k01y0u&dl=0

Edited May 28, 2025 by Seideno
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[Kladovec]

It looks correct, one small correction in the actuator head I´m using shorter tip from technic brick (https://www.bricklink.com/v2/catalog/catalogitem.page?P=2743#T=C). My reason for rebuilding and use brick build actuator was, that Effe´s 3D printed actuator was not capable to lift boom from plane position. But even this actuator can't handle it, you have to help yourself raise your hand, at least from the beginning.