> For the complete documentation index, see [llms.txt](https://docs.wcproducts.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wcproducts.com/welcome/gearboxes/planetaryx/assembly-instructions/px-180-degree-gearbox/steps-1-4.md).
# Steps 1-4
{% hint style="info" %}
The following steps will use the 1/2" Hex Male Coupler for the Planetary Assembly.
{% endhint %}
## Step 1
Install the 17mm ID x 26mm OD Radial Bearing into the Input Block. It is a snug fit and can be installed by hand or with an arbor press, if necessary. The bearing should be fully seated in the Input Block.
Next, position the Male Input Hex Shaft into the Input Block in preparation for assembly
## Step 2
Place the Output Shaft into the Output Block and use the #10-32 x 1/2"L Bolt to secure the shaft.
{% hint style="info" %}
The Output Shaft in the picture is only for reference, the shaft will vary based on user application.
{% endhint %}
## Step 3
Combine the assemblies from Step 1 and Step 2 with your selected gear set stack-up to achieve the desired gear ratio. Each gear set should sit flush against the next. Secure the full stack-up to the Output Block using the four #10-32 SHCS bolts specified below.
{% hint style="info" %}
Refer back to the [Load Ratings](/welcome/gearboxes/planetaryx/general-info/load-ratings.md) Section for your desired overall gear ratio and the corresponding gear sets.
{% endhint %}
| Stages | Bolt Length |
| ------- | ----------- |
| 1 Stage | 1.5"L SHCS |
| 2 Stage | 2"L SHCS |
| 3 Stage | 3"L SHCS |
## Step 4
Install the 1/2" Rounded Hex ID x 1-1/8" OD Flanged Bearing into the Gearbox Plate.
---
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