# 3.4 | Electronic Control Unit (ECU) Installation

<p class="callout danger">**IMPORTANT**: Please ensure you have read the safety information in the previous chapter before commencing installation of **COMMAND**.</p>

### Machine Preparation

Complete the following steps before beginning installation of the **COMMAND** ECU:

<table id="bkmrk-move-the-tractor-and"><colgroup><col></col><col></col></colgroup><tbody><tr><td>**Step**

</td><td>**Check**</td></tr><tr><td>Move the tractor and implement to a level, hard surface suitable for maintenance work.

</td><td>  
</td></tr><tr><td>Center the steering wheels. For articulated tractors, engage the articulation locks to prevent movement.

</td><td>  
</td></tr><tr><td>Fully lower any attachments or implements to the ground to ensure stability.

</td><td>  
</td></tr><tr><td>Turn off the engine and remove the ignition key.

</td><td>  
</td></tr><tr><td>Block both the front and rear wheels to prevent accidental movement of the machine during installation.

</td><td>  
</td></tr><tr><td>Allow the engine and hydraulic system to cool completely before working near hot components.

</td><td>  
</td></tr><tr><td>Disconnect the battery cables. Place a **“Do Not Operate”** tag in a visible location in the cab, and install a **lockout box** on the battery terminal to prevent accidental power reconnection.

</td><td>  
</td></tr><tr><td>Before opening any hydraulic, pneumatic, or coolant lines, relieve system pressure. Use caution when removing fill caps or hose fittings—cover the area with a clean rag to contain any residual pressure or fluid spray.

</td><td>  
</td></tr><tr><td>Unbox all kit components and verify the contents against the packing list. Lay out the parts on a clean, organized work surface to streamline installation.

</td><td></td></tr></tbody></table>

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