Treadmill Doctor Walking Belt for the Star Trac 4000 Treadmill Model Number 4000 Review HelpfulOwl Treadmill Belts June 10, 2018September 2, 2018Exercise & Fitness, Exercise Machine Parts & Accessories, Sports & Fitness, Sports & Outdoors, Treadmill Doctor 0 Comment This fits your . Make sure this fits by entering your model number. 1 Year Warranty