This video details how I diagnosed and repaired an inoperative main slideout room on our 2011 Keystone Cougar. The slide mechanism had worked perfectly since new, but we arrived at a new campsite the other day, and it would not go out! All I could hear was a whirring noise when I pushed the open button.

So, I crawled under the trailer where I knew that Keystone had left an access panel below the electric slide motor. I was able to use an electric drill to manually open the slide. Next, I removed the motor and took it apart to troubleshoot the issue.

Turns out that a nylon gear had a section of its teeth worn off. The motor would just spin freely. Luckily, I located an all-metal replacement gear on Amazon. With a slight modification using a file, it worked fine. Two days later the slide was once again functional. I was a happy camper since the cost of a new motor was hundreds of dollars, and the gear was only $25.