I'm not really sure if the new updates changed something, but after 3 times rebuilding the excavator, i think that this is a bug or something.
Every time I right-click the excavator, only the engine part forms but the wheel doesn't and the excavator won't start.
I already updated to the latest version of IE and Forge

I don't know if it's relevant but still, i'm playing in a macbook

It currently only works with IE steel blocks. I'll look into fixing that.

Hi, this issue is currently also a problem in version 1.12.2, except here it does NOT work with IE steel blocks but it does work with Thermal Foundation steel blocks.

1.12 is no longer supported and you are commenting on an issue closed months ago.