# Assembly Instructions

## Hardware Kit Information

| Assembly Type                    | Hardware Size | Head Type |
| -------------------------------- | ------------- | --------- |
| Ultra 90 Degree Gearbox          | M3 x 40mm     | Socket    |
| Hex Shaft                        | 5mm x 20mm    | -         |
| UltraPlanetary Face Mount Spacer | M3 x 40mm     | Socket    |

## Assembly Instructions

For adding a Ultra 90 Degree Gearbox you will need all of the parts in the Hardware Kit, a 1.5mm Allen Wrench, and a 2mm Allen Wrench.

{% hint style="info" %}
This assembly guide assumes you have a fully assembled UltraPlanetary Gearbox mounted to your motor of choice. Please see the [UltraPlanetary Gearbox assembly instructions](https://docs.revrobotics.com/rev-crossover-products/ultraplanetary/assembly-instructions) if you do not have a fully assembled UltraPlanetary Gearbox. 
{% endhint %}

| 1) Insert the 20mm long hex shaft into the output of the gearbox.                                                                                                                                                                                        | <img src="https://1166281274-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-ME3KPEhFI6-MDoP9nZD%2Fuploads%2F8WK8Y6MzqjqPOwhZCSlf%2Fimage.png?alt=media&#x26;token=6bfeac77-2c76-4a55-8f63-cebfb585fcbc" alt="" data-size="original"> |
| -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
| <p>2) Place the Face Mount Spacer on the output of the the gearbox as shown. </p><p></p><p><strong>Note: Line up the short edge of the spacer with a flat side of the UltraPlanetary gearbox body.</strong></p>                                          | <img src="https://1166281274-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-ME3KPEhFI6-MDoP9nZD%2Fuploads%2FrSZpvLBUkWdXRfxgVfMa%2Fimage.png?alt=media&#x26;token=051b2919-01d3-45c1-a20e-cde10413bac5" alt="" data-size="original"> |
| 3) Rotate the hex shaft output so that it lines up with the hex input on the Ultra 90 Degree Gearbox.                                                                                                                                                    | <img src="https://1166281274-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-ME3KPEhFI6-MDoP9nZD%2Fuploads%2FM0x8Gscra9sHoCqk6b22%2Fimage.png?alt=media&#x26;token=f2ab0513-9818-4d73-9a86-28308d4cb994" alt="" data-size="original"> |
| 4) Slide the two gearboxes together. Rotate the Ultra 90 Degree Gearbox until the spacer and gearbox body line up.                                                                                                                                       | <img src="https://1166281274-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-ME3KPEhFI6-MDoP9nZD%2Fuploads%2FJ53TzEvsDAtwRY9CCGZy%2Fimage.png?alt=media&#x26;token=f4eeb656-a160-4f9d-b5d1-9b13de9c0074" alt="" data-size="original"> |
| 5) Insert the 4 mounting screws in the holes on the end of the Ultra 90 Degree Gearbox. Ensure that they line up with the holes in the spacer and the gearbox.                                                                                           | <img src="https://1166281274-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-ME3KPEhFI6-MDoP9nZD%2Fuploads%2F7Zg8mrEG9Aem9Cy5s7Sr%2Fimage.png?alt=media&#x26;token=e33319c0-2318-46b0-9b32-8329c348c548" alt="" data-size="original"> |
| <p>6) Tighten the 4 mounting screws hand-tight. Then alternate between slightly tightening screws diagonally across from each other in an X shaped pattern. </p><p></p><p><strong>Note: Take care not to over tighten the mounting screws.</strong> </p> | <img src="https://1166281274-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-ME3KPEhFI6-MDoP9nZD%2Fuploads%2FTzh92ojaHKO7eGhmMfyl%2Fimage.png?alt=media&#x26;token=12fef224-469d-4c35-8d35-826c0813bd46" alt="" data-size="original"> |

#### Mounting Thread Engagement

{% hint style="info" %}
With standard REV channel or brackets, the recommended screw length for mounting the Ultra 90 Degree Gearbox to REV motor brackets or channels is M3 x 6mm (REV-41-1713). REV recommends that no more than 4mm of thread engagement is used to mount the gearbox on the motion pattern faces.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.revrobotics.com/rev-crossover-products/ultraplanetary/ultra-90/assembly-instructions.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.