Changing the seal on an SEW-EURODRIVE gear unit

Introduction

This tutorial will guide you through the process of safely replacing both single and double lip seals on SEW-EURODRIVE gear units. Properly changing the seals is crucial for maintaining the efficiency and longevity of your reducers. This guide will provide you with the necessary tools, safety precautions, and step-by-step instructions to complete the task effectively.

Step 1: Gather Required Tools

Before starting the seal replacement, ensure you have the following tools ready:

• Socket set
• Screwdrivers (flathead and Phillips)
• Pliers
• Seal puller or a similar tool
• Clean cloths or rags
• New seals (single and double lip as needed)
• Lubricant (appropriate for your application)

Step 2: Ensure Safety Precautions

Safety is paramount when working with machinery. Follow these precautions:

• Disconnect power to the gear unit before starting any work.
• Use personal protective equipment (PPE), including safety goggles and gloves.
• Work in a well-ventilated area to avoid inhaling any fumes or dust.

Step 3: Remove the Gear Unit from Service

To access the seals, remove the gear unit from its operational setup:

1. Disconnect any attached components, such as motors or drives.
2. Use the socket set to unbolt the gear unit from its mounting.
3. Carefully lift and place the unit on a clean work surface.

Step 4: Identify and Remove Old Seals

Locate the seals that need replacement:

• Inspect the gear unit to identify whether it has single or double lip seals.
• Use a seal puller or pliers to gently remove the old seals. Take care not to damage the housing during this process.

Step 5: Clean the Seal Housing

After removing the old seals, clean the housing:

• Use a clean cloth to wipe down the area where the seals were located.
• Ensure no debris or old seal material remains, as this can affect the installation of new seals.

Step 6: Install New Seals

Follow these steps to install the new seals properly:

1. Apply a thin layer of lubricant to the outer edge of the new seals. This helps with installation and ensures a better seal.
2. Carefully align the new seal in the housing and press it into place. Make sure it sits flush with the housing.
3. If installing double lip seals, ensure the inner lip is also correctly positioned.

Step 7: Reassemble the Gear Unit

Once the new seals are installed:

1. Reattach any components that were removed earlier.
2. Secure the gear unit back onto its mounting using the bolts.
3. Reconnect any electrical connections, ensuring all wires are properly insulated.

Conclusion

Replacing seals on an SEW-EURODRIVE gear unit is a manageable task with the right tools and precautions. Ensure that you follow each step carefully to avoid damage and maintain the efficiency of your gear unit. For specific settings related to your AC motor, consider downloading the Operating Instructions PDF provided in the video description. Regular maintenance, including seal replacement, will help extend the life of your equipment and improve performance.