# Pinion Pressing Guide

### HD Hex Pinion Pressing Guide

#### Needed Materials:

* HD Hex Motor (REV-41-1291)
* A Small Phillips Head Screwdriver
* Press Fit Pinion
* Arbor Press

<figure><img src="https://756878072-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FH9K1InCLC1ZxIkdPJt31%2Fuploads%2FIkX7r1sEy8Ofza627NSJ%2FNeeded%20Matrial.jpg?alt=media&#x26;token=17235019-8b40-4c8e-a57b-bf04955a3ca1" alt=""><figcaption></figcaption></figure>

| 1) Using a small Philips head screwdriver, remove the two small screws holding on the HD Hex Motor's Encoder Cover.                                                                                                                                                                                                                           | ![](https://756878072-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FH9K1InCLC1ZxIkdPJt31%2Fuploads%2FMYlpImuJh8DYOx9IiOjB%2FUnscrew%20Cover.jpg?alt=media\&token=ccfa34ae-f1e9-4f7e-ae58-f83031e6b756)               |
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| 2) Remove the cover. Set it and the two screws aside for reassembly after pressing on the pinion.                                                                                                                                                                                                                                             | ![](https://756878072-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FH9K1InCLC1ZxIkdPJt31%2Fuploads%2FTTL79y5HxPyrtmHlICHq%2FCover%20Removed.jpg?alt=media\&token=b291b89d-b411-4b4f-95ad-1abb71470eb2)               |
| <p>3) Using a flat arbor press plate, balance the motor with the end of the shaft supported by the plate. Keep the motor shaft perpendicular to the plate and the press. </p><p></p><p><strong>Make sure the JST VH 2-pin connector is not load-bearing in your setup</strong>, sometimes it may sit further out than the motor's shaft. </p> | ![](https://756878072-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FH9K1InCLC1ZxIkdPJt31%2Fuploads%2Falu6dQ0A6mugqUTIJDCo%2FJST%20VH%202%20Pin%20Overhang.jpg?alt=media\&token=f944f99a-6a1b-4cd4-94a7-9c7b45bee341) |
| 4) Press on the pinion using the arbor press. After pinion is pressed on reattach the HD Hex Motor's Encoder Cover.                                                                                                                                                                                                                           | ![](https://756878072-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FH9K1InCLC1ZxIkdPJt31%2Fuploads%2FDhkFjgSm1pAyNnpXA6a4%2FPress%20Pinion.jpg?alt=media\&token=98739ccc-ae8c-46ba-a127-16d108abb1b2)                |
| 5) Take care to not over-press, there should be a gap between the pinion and motor. The pinion should not be touching the body of the motor.                                                                                                                                                                                                  | ![](https://756878072-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FH9K1InCLC1ZxIkdPJt31%2Fuploads%2Fu9Bidttnr8aBsgYzFB6M%2FPinion%20Gap.jpg?alt=media\&token=1e6a5843-6bf4-4768-b53f-9aaab39bcb36)                  |