Excavator

3. Another variation of the boom; hinges in the middle for better balance or reach.
5. A machine with a hydraulic arm that digs soil and other materials; can be as small as 0.7 tons, and as large as over 100 tons.
6. The large, hollow metal piece on the end of the arm, used to dig into soil; can have teeth or a smooth edge
10. An attachment, used to break up rock, cement, concrete, asphalt, or other materials.
12. The rear toothed gears, that drive the track around.
13. An attachment, similar to a tooth or fang; used to rip and tear apart hard materials, such as soil or asphalt.
15. The lower half of the machine, where the tracks and occasionally dozer-blade are mounted.
16. A very useful implement that allows an operator to quickly switch attachments; can be hydraulic or manual
17. The box-like structure mounted next to the boom on the superstructure; this is where the operator sits to operate the machine; One person only, usually.

1. The first and largest piece of the digging structure; mounts onto the superstructure, next to the cab of the excavator. This version is one single piece.
2. The front wheel that the track rolls around; tensions the track via a large spring.
4. A wide implement that is usually attached to the excavator between the tracks; used for stabilizing the machine as well as backfilling.
7. The top part of the excavator, where the engine, hydraulic systems, cab, and digging structure are mounted.
8. The large ring that the superstructure rotates on.
9. The second section of the digging structure; can sometimes have auxiliary hydraulics plumbed on it.
11. A metal piece that usually connects to the same pin as the bucket; used to clamp or grab objects.
14. The large, continuous chain-like treads that most excavators use to move about; Have track pads on them that can be of different widths and materials.