--- title: How to Change the Drive Roller for the Leister BITUMAT B2 description: If bitumen builds up your BITUMAT B2 drive roller, it can lead to inconsistent welds. Here’s how to swap it out for a clean drive roller. --- Search our inventory of drains, drain parts, safety and roofing equipment, and accessories. [Shop Now](https://hy-techroof.com/products/). - [ About ](https://www.hy-techroof.com/about-hy-tech/) - [ Contact ](https://www.hy-techroof.com/contact-hy-tech/) - - [![Hy-Tech Roof Products](https://resources.hy-techroof.com/hubfs/Logos/Hy-Tech%20Logo_rgb_maroon_480.png) ](https://www.hy-techroof.com) [**](https://www.hy-techroof.com/login.php) [**](https://www.hy-techroof.com/cart.php) ** ** [![Hy-Tech Roof Products](https://resources.hy-techroof.com/hubfs/Logos/Hy-Tech%20Logo_rgb_maroon_480.png) ](https://www.hy-techroof.com) [**](https://www.hy-techroof.com/cart.php) - - # How to Change the Drive Roller for the Leister BITUMAT B2 As the[ Leister BITUMAT B2](http://www.hy-techroof.com/leister-bitumat-b2) welds a bitumen seam, there is a good chance that the drive roller will be exposed to melted bitumen. If this builds up, it can cause the wheel to lie unevenly against the material surface leading to a poor weld. The BITUMAT B2 comes with a spare drive roller, which is stored under the circular weight at the front of the machine (opposite the guide bar). To attach this new drive roller, follow these instructions:  1. Unscrew the weight from the front of the machine. ![BITUMAT_Changing_Drive_Roller](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_Roller.png?width=218&name=BITUMAT_Changing_Drive_Roller.png) 2. Pull the new guide roller out of its holder. ![BITUMAT_Changing_Drive_Roller_2](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_Roller_2.png?width=217&name=BITUMAT_Changing_Drive_Roller_2.png) 3. Place the welder on its side so that the hot-air blower faces up. ![BITUMAT_Changing_Drive_Roller_3](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_Roller_3.png?width=307&name=BITUMAT_Changing_Drive_Roller_3.png) 4. Unscrew the brass fastening screw by turning counter-clockwise, and remove. ![BITUMAT_Changing_Drive_Roller_4](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_Roller_4.png?width=228&name=BITUMAT_Changing_Drive_Roller_4.png) 5. Pull the air dam off of the deflector roller. ![BITUMAT_Changing_Drive_Roller_5](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_Roller_5.png?width=231&name=BITUMAT_Changing_Drive_Roller_5.png) 6. Pull the drive roller up and off of the machine, and then pull the air dam off of the roller. ![BITUMAT_Changing_Drive_Roller_6](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_Roller_6.png?width=229&name=BITUMAT_Changing_Drive_Roller_6.png) 7. Lay the air dam into the groove of the new drive roller. ![BITUMAT_Changing_Drive_Roller_7](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_Roller_7.png?width=230&name=BITUMAT_Changing_Drive_Roller_7.png) 8. Align the new drive roller with the post on the machine, and slide it into position. ![BITUMAT_Changing_Drive_Roller_8](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_Roller_8.png?width=225&name=BITUMAT_Changing_Drive_Roller_8.png) 9. Pull the air dam back over the deflector roller and make sure it lies completely in the groove. ![BITUMAT_Changing_Drive_Roller_9](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_Roller_9.png?width=227&name=BITUMAT_Changing_Drive_Roller_9.png) 10. Insert the brass fastening screw through the middle of the drive roller and tighten until snug. ![BITUMAT_Changing_Drive_Roller_10](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_Roller_10.png?width=230&name=BITUMAT_Changing_Drive_Roller_10.png) 11. Make sure the air dam aligns with the two guide rollers, and then flip the machine back into the proper position. ![BITUMAT_Changing_Drive_ROller_11](https://resources.hy-techroof.com/hs-fs/hubfs/BITUMAT_Changing_Drive_ROller_11.png?width=229&name=BITUMAT_Changing_Drive_ROller_11.png) *If you have any questions or are having any trouble with your welder, please contact your [Leister authorized service center](https://resources.hy-techroof.com/hy-tech-products-service-centers).* - [Drains](https://www.hy-techroof.com/products/drains/) - [Zurn](https://www.hy-techroof.com/manufacturers/zurn/) - [Smith](https://www.hy-techroof.com/manufacturers/j-r-smith/) - [Josam](https://www.hy-techroof.com/manufacturers/josam/) - [Wade](https://www.hy-techroof.com/manufacturers/wade/) - [Marathon](https://www.hy-techroof.com/manufacturers/marathon/) - [Olympic](https://www.hy-techroof.com/manufacturers/olympic/) - [Equipment](https://www.hy-techroof.com/products/equipment) - [Garlock](https://www.hy-techroof.com/manufacturers/garlock/) - [Leister](https://www.hy-techroof.com/manufacturers/leister/) - [All Seasons / Grizzly](https://www.hy-techroof.com/manufacturers/all-seasons-equipment/) - [Hennes-Johnson](https://www.hy-techroof.com/manufacturers/hennes-johnson/) - [Gator](https://www.hy-techroof.com/manufacturers/gator-roofing-equipment/) - [Roofmaster](https://www.hy-techroof.com/manufacturers/roofmaster-products-company/) - [Safety](https://www.hy-techroof.com/products/safety) - [Leading Edge](https://www.hy-techroof.com/manufacturers/leading-edge-safety/) - [Tie Down Manufacturing Ingenuity](https://www.hy-techroof.com/manufacturers/tie-down-manufacturing-ingenuity/) - [Malta Dynamics](https://www.hy-techroof.com/manufacturers/malta-dynamics/) - [Resources](https://resources.hy-techroof.com) - [Account](https://www.hy-techroof.com/login.php) - [The Drain Wizard](https://resources.hy-techroof.com/ask-the-drain-wizard) - [FAQ](https://resources.hy-techroof.com/faq) - [Blog](https://resources.hy-techroof.com/blog) - [Roof Drain Specs](https://resources.hy-techroof.com/roof-drain-specs-and-diagrams) - [Video Library](https://resources.hy-techroof.com/video-library) - [About](https://www.hy-techroof.com/about-hy-tech/) - [Contact Us](https://www.hy-techroof.com/contact-hy-tech/) - [About Hy-Tech](https://www.hy-techroof.com/about-hy-tech/) - [Service and Repairs](https://www.hy-techroof.com/service-and-repairs/) [800-635-0384](tel:8006350384) **Hy-Tech Products **10035 Broadview Road, Broadview Heights, OH 44147 [info@hy-techroof.com](mailto:info@hy-techroof.com) [800-635-0384](tel:8006350384) **Hy-Tech Products **10035 Broadview Road, Broadview Heights, OH 44147 [info@hy-techroof.com](mailto:info@hy-techroof.com) © 2026 Hy-Tech Products, Inc. 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