This manual on belts and chain drives is one of a series of power mechanics texts and visual aids on theory, of operation, diagnosis, and repair of automotive and off-the-road agricultural and construction equipment. Materials provide basic information and illustrations for use by vocational students and teachers as well as shop servicemen and laymen. Focusing on belts, the first of two parts addresses topics such as advantages and disadvantages of belts, types of belts, comparison of belts, operation of V-belt drives, reading V-belt sizes, V-belt pulleys and sheaves, relative output speed of belt drives, variable-speed belt drives, belt tension mechanisms, mechanical interference, sheave groove wear, replacing sheaves, installing V-belts, maintenance of flat belts, wear on flat belts, and trouble shooting belt drives. Part 2 focuses on chains and addresses topics such as principles of chain drives, advantages and disadvantages of chains, uses of chains, types of chains, drive arrangements, matching chains and sprockets, relative speed of sprockets, aligning shafts and sprockets, chain slack, lubricating chains, chain wear, and trouble shooting chain drives. Each part concludes with test questions. Answers to the test questions are appended. (A supplementary 35mm color slide set is also available--see availability note.) (LRA)