Go to Lippert Components Inc.
; follow the links to the service/adjustment instructions for your make/model slide mechanism to find detailed adjustment instructions. Through the years I have decided there are few RV technicians that fully understand how to properly adjust them. Consequently I first attempt to do the job myself, if I fail then it's time to find a competent RV technician.
OTOH, we have one slide that would never adjust properly. Only a visit to the factory discovered the entire problem was caused by bent tubes in the slide mechanism. The factory replaced the defective parts at no cost, 3 years out of warranty. The factory service center does this every day and know how to properly adjust slides. It took them about 10 minutes to find the cause of the problem and about 2 hours to replace the defective parts, adjust the mechanism.