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Some minor changes for a smooth operation of 42055 Bucket Wheel Excavator:

- replaced friction-less pins by axles for all gear and belt bearings to reduce friction
- avoid blocking of belt and bucket wheel by adding a axle and pin connector #3 to guide the chain elements into the arm
- adding some pins to enhance rigidity of the tower

Use Rebrickable's compare feature to see the additional parts you need, if you have the original set 42055-1.

The PDF instructions only contain the different building steps. So you also will need the original instructions from Lego.

42055-1 - Smooth Bucket Wheel Excavator-42055 - diggerarm2.png
42055-1 - Smooth Bucket Wheel Excavator-42055 - diggerarm.png
42055-1 - Smooth Bucket Wheel Excavator-42055 - motorassy.png
42055-1 - Smooth Bucket Wheel Excavator-42055 - outputconveyor.png
42055-1 - Smooth Bucket Wheel Excavator-42055 - towerbase.png
42055-1 - Smooth Bucket Wheel Excavator.mpd
42055-1 - Smooth Bucket Wheel Excavator.pdf
42055-1 - Smooth Bucket Wheel Excavator.png