> For the complete documentation index, see [llms.txt](https://docs.revrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.revrobotics.com/rev-crossover-products/ultraplanetary/ultra-90/rotation-direction.md).

# Rotation Direction

The exterior of the gearbox is completely symmetrical; however, it is **NOT** symmetrical internally. Depending on the orientation of the gearbox, the bevel gear on the output shaft could be on either side which will affect the rotation direction.

{% hint style="info" %}
Before installing the gearbox, check the rotation direction by hand and orient it in the direction that produces the desired rotation direction.
{% endhint %}

### Orientation A

<div><figure><img src="/files/ZM9EGnU1jTZTMdkOPbNW" alt=""><figcaption><p>Bevel gears on right side of gearbox</p></figcaption></figure> <figure><img src="/files/J2h453JXvzELlmCyciNO" alt=""><figcaption><p>Bevel gears on right side of gearbox - rotation directions</p></figcaption></figure></div>

### Orientation B

<div><figure><img src="/files/Hw9XeQ8ea8f2JmqycLUh" alt=""><figcaption><p>Bevel gears on left side of gearbox</p></figcaption></figure> <figure><img src="/files/FwskQCPcd9iIA20b7ONB" alt=""><figcaption><p>Bevel gears on left side of gearbox - rotation directions</p></figcaption></figure></div>