English to Spanish Tech/Engineering Engineering (general) Photography

Hola!
Necesito traducir el término "gear" en un contexto de fotografía, ¿alguna sugerencia?
Gracias!

"- With the system power off, rotate Focus gear by hand in a complimentary direction to its maximum position.

- Loosen the Servo Bracket Knob on the Servo Bracket and position the Focus Gear to match the gear track of the lens.
- Swing the Focus Gear down to engage to the track. Apply light pressure on the gear to ensure good engagement with the gear track; tighten Servo Bracket Knob.
- Slowly rotate the lens, by using the Focus Controls (see instructions on page 53), to ensure proper gear tracking. Repeat step 2-4 for engaging Iris Gear.
Note: Too much pressure may cause the servo motor to bind. Too little pressure and the gear will slip. You will quickly learn the correct pressure that is needed. On some lenses, it is necessary to remove the Servo from the Servo Bracket and mount the Servo in a different position on the Servo Bracket, in order for the wheel and gear to line up."