# How to operate the Vieira MCO hammer mill

URL: https://moinhosvieira.com.br/en/how-to-operate-the-hammer-mill-vieira-mco/  
Updated on: 2026-11-04  
Other languages: Español: https://moinhosvieira.com.br/es/como-operar-el-molino-vieira-mco/ · Português: https://moinhosvieira.com.br/como-operar-o-moinho-vieira-mco/

> To operate the Vieira MCO mill: carry out the checks, start it with the grinding box empty, feed the funnel gradually and collect the product from the bagging hopper. Never switch it off with the box full.

## Step by step

1. **Carry out the checks.** Check the motor electrical connection, the fit of the feed elbow, the fit of the screen and that the grinding box door is closed. Remove loose objects from near the funnel.
2. **Start it with the box empty.** Start the mill only with the grinding box empty.
3. **Feed it gradually.** Put the product into the feed funnel gradually until you reach normal output for your product. Never feed the mill all at once.
4. **Collect the ground product.** The ground product comes out of the bagging hopper.
5. **Finish with the box empty.** Stop feeding and let the mill finish grinding what is in the box before switching it off. Never switch it off with the grinding box full.
6. **Wait for it to stop before opening.** After switching off, wait for the rotor to stop completely before opening the grinding box door.

## How much the mill produces

Output depends on the product (moisture, oil content, hardness) and on the screen hole size. To find out the output range for your product, contact technical assistance.

## Take care of the motor

Feeding more than the motor can handle overloads the electric motor and can damage it. If you need to check the motor current, use an ammeter and ask technical assistance for the limit for your model.

Before the first grinding run, read the [safety precautions](https://moinhosvieira.com.br/en/safety-precautions-hammer-mill-vieira-mco/).