This excavator is build in scale 21,5:1 and features 7 pneumatic functions:
- front blade
- rear stabilizers
- liftable cabin
- 2 stage boom
- arm movement
- bucket movement
Beside that there is pendular front axle with Ackermann geometry and HOG steering wheel at the back. Superstructure rotation is by knob near pneumatic switches. There is also ball hitch for trailer. The goal was to make the model as accurate as possible according to blueprints. The boom movement is a little bit worse due to length of pneumatic cylinder that moves the second half of boom. Also cabin lift is little bit limited by same cylinder. The biggest drawback is bucket, unfortunatelly LEGO is not making suitable one.
Beside the parts shown in PL you will need tubbing is total length 400cm in approx. sizes:
Something heavy as counterweight, I have used empty shell from small BB filled with 250g of steel washers.
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