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Across 4. Device that removes dust from the air entering the engine. 12. Compartment from which the operator controls the bulldozer. 14. Machine that can move along rough ground by means of two tracks; it is equipped with a blade and a ripper. 15. Sprocket on the final drive that meshes with the track to provide traction. 16. Conduit through which the combustion gases are expelled into the ambient air. 17. Chain made up of articulated shoes that rolls between the wheels and the ground; it allows the bulldozer to move over rough terrain. 18. Equipment for breaking up hard earth; it is made up of a frame fitted with one to three teeth and is mounted on the back of a bulldozer. 19. Lengthwise part forming the track’s chassis; the final drive and the track idler are attached to it.

Down 1. Combustion engine in which the compressed air becomes sufficiently hot to ignite the injected fuel. 2. Hydraulic device with a telescopic arm for raising and lowering the blade. 3. Concave metal equipment for moving earth by pushing it along the ground; it is held up by two articulated arms and caused to swivel by hydraulic cylinders. 5. Lengthwise part articulating with the roller frame and the blade. 6. Hydraulic device with a telescopic arm that manipulates the ripper. 7. Part attached to the end of the tooth that breaks into hard ground; it is replaced when worn out. 8. Part of the ripper that digs into the ground to break it up. 9. Part attached on the inner side of a tooth to brace the tooth; it is replaced when worn out. 10. Motor wheel with teeth that drives the track. 11. Wheel connected to the final drive by the roller frame; it keeps the track taut and aligned. 13. Bottom sharp part of the blade that scrapes the ground; it is replaced when worn out.