ONE OF A SERIES DESIGNED TO HELP TEACHERS PREPARE POSTSECONDARY STUDENTS FOR THE AGRICULTURAL MACHINERY SERVICE OCCUPATIONS AS PARTS MEN, MECHANICS, MECHANIC'S HELPERS, AND SERVICE SUPERVISORS, THIS GUIDE AIMS TO DEVELOP STUDENT UNDERSTANDING OF A SYSTEMATIC PROCEDURE AND ABILITY TO PERFORM TUNEUPS AND MAINTENANCE TASKS. IT WAS DEVELOPED BY A NATIONAL TASK FORCE ON THE BASIS OF RESEARCH FROM STATE STUDIES. SUGGESTIONS FOR INTRODUCING THE MODULE ARE GIVEN. SUBJECT-AREA UNITS INCLUDE--(1) ECONOMIC IMPORTANCE OF PROPER TUNING, (2) MAJOR COMPONENTS OF A FARM TRACTOR, (3) VALVE ADJUSTMENT, (4) ELECTRICAL AND IGNITION ADJUSTMENT, (5) AIR, FUEL, AND EXHAUST SYSTEM ADJUSTMENT, (6) COOLING SYSTEM MAINTENANCE AND ADJUSTMENT, AND (7) POWER TRAIN MAINTENANCE AND ADJUSTMENT. EACH UNIT INCLUDES SUGGESTED SUBJECT-MATTER CONTENT, TEACHING-LEARNING ACTIVITIES, SUGGESTED MATERIALS, AND REFERENCES. SUGGESTED TIME ALLOTMENT IS 24 HOURS OF CLASS INSTRUCTION AND 48 HOURS OF LABORATORY EXPERIENCE. TEACHERS SHOULD HAVE EXPERIENCE IN AGRICULTURAL MACHINERY. STUDENTS SHOULD HAVE MECHANICAL APTITUDE AND AN OCCUPATIONAL GOAL IN AGRICULTURAL MACHINERY. SUGGESTIONS FOR EVALUATING EDUCATIONAL OUTCOMES ARE INCLUDED. THIS DOCUMENT IS ALSO AVAILABLE FOR A LIMITED PERIOD AS PART OF A SET (VT 000 488 THROUGH VT 000 504) FROM THE CENTER FOR VOCATIONAL AND TECHNICAL EDUCATION, THE OHIO STATE UNIVERSITY, 980 KINNEAR ROAD, COLUMBUS, OHIO 43212, FOR $7.50 PER SET. (JM)