> 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/ion-build/build-guides/maxplanetary-gearbox-assembly/spacer-installation.md).

# Spacer Installation

MAXPlanetary Base Kits purchased before 11/14/2022 included a MAXPlanetary CIM/Falcon Spacer (REV-21-2119) to ensure that the input stage for CIM, MiniCIM, and Falcon 500 motors sits correctly in the MAXPlanetary Gearbox. Please be sure to install the spacer before assembling your MAXPlanetary Gearbox and attaching the Input Stage to your motor. 

## Spacer Assembly Guide

{% hint style="info" %}
The following steps are only required if you are using a CIM, MiniCIM, or Falcon Motor
{% endhint %}

|                                                                               |                                  |
| ----------------------------------------------------------------------------- | -------------------------------- |
| 1) Place the MAXPlanetary CIM/Falcon Spacer onto your motor.                  | ![](/files/PSGXOwSUxKUg1oyqi1Qg) |
| 2) Align two of the mounting holes on the motor with the holes in the spacer. | ![](/files/aTb7yBLZDUXhy4W1KbvB) |

{% hint style="success" %}
[You are now ready to continue assembling your MAXPlanetary Gearbox!](/ion-build/build-guides/maxplanetary-gearbox-assembly.md)
{% endhint %}

## When to use the CIM/Falcon Spacer

### Keyed Input Coupler V1

MAXPlanetary Gearboxes purchased **before** 11/14/2022 use Version 1 of the MAXPlanetary Keyed Input Coupler and will need to install the included spacer to use a CIM, miniCIM, or Falcon 500. If your Keyed Input Coupler is a V1, the dimension highlighted in the drawing below will be 14.9mm or 0.59in.

<figure><img src="/files/W1bwWDDe7iafnCQD7zB3" alt=""><figcaption></figcaption></figure>

### Keyed Input Coupler V1.1

MAXPlanetary Gearboxes purchased **after** 11/14/2022 use Version 1.1 the MAXPlanetary Keyed Input Coupler and do not need the spacer. If your Keyed Input Coupler is a V1.1, the dimension highlighted in the drawing below will be 14.4mm or 0.57in.

<figure><img src="/files/DiFZ6F4HyKYD9hSODZFi" alt=""><figcaption></figcaption></figure>

### Falcon Spline Input Coupler

When using a Falcon Spline Input Coupler with your MAXPlanetary Gearbox you do not need to install the spacer.