I have a fully completed Cat D11. Great build. (I have previously built the Bucket Wheel Excavator, the Rough Terrain Crane, Liebherr 9800, Airbus 175, etc.) Couldn't get through calibration. Did not understand I should have tested the build per step 198. (You'd think I could follow picture instructions at age 74...)
After much evaluation and checking everything I could think of, I can see in the build step 104 I put the small bevel gear ON THE WRONG SIDE of the drive gear. Obviously it is trying to drive that shaft in the wrong direction!
Does anyone have an idea how I can switch out the gear WITHOUT tearing the build down completely? I'd like to see my 75th birthday...