AST1423 Manual Transmission/Transaxle and 4x4 Course Outcome Summary
Course Information Organization South Central College Revision History Spring 2009 Course Number AST1423 Department Automotive Service Total Credits 3
Description This course covers the operation and the proper repair procedures for the types of manual transmissions/transaxles and transfer cases used in late model vehicles. Four wheel drive locking hubs, axle disconnects, AWD, full-time, and part-time four-wheel drive systems will also be covered. Prior knowledge gained by successful completion of AST1112 is required for student success in this class. 3 cr. (2 lec/pres, 1 lab, 0 other)
Types of Instruction Instruction Type Contact Hours Credits Lecture 32 2 Lab 32 1
Prerequisites None
Exit Learning Outcomes Core Abilities A. Critical Thinking B. Math Logic
Program Outcomes A. The student, after completing this course, will have a basic understanding of manual transmissions/transaxles and four wheel drive systems.
Competencies 1. Exhibit Professionalism Learning Objectives a. Demonstrate shop safety practices b. Perform Safety Procedures 2. Identify manual trans/transaxles Learning Objectives a. Identify manual trans/transaxle components b. Diagnose manual trans/transaxle fluid condition, fluid level and leaks c. Identify manual trans/transaxle fluid, drain and refill trans/ transaxle and final drive unit d. Diagnose noise concerns using transmission/transaxle powerflow principles. e. Calculate manual transaxle gear ratio f. Diagnose hard shifting and jumping out of gear, determine necessary action. g. Inspect, adjust, and reinstall shift linkages, brackets, bushings, cables, pivots, and levers. h. Inspect, replace, and align powertrain mounts. i. Diagnose transaxle final drive assembly noise and vibration concerns; determine necessary action. 3. Remove and reinstall transmission/transaxle. Learning Objectives a. Dissassemble manual transaxle, clean and inspect b. Inspect manual transaxle gears / shafts c. Inspect manual transaxle synchros / hubs / blocking rings / sleeves / inserts and springs d. Inspect manual transaxle bearings e. Inspect manual transaxle thrust washers f. Measure end play or preload (shim or spacer selection procedure) on transmission/transaxle shafts; perform necessary action. g. Install countershaft gear assembly h. Inspect /reinstall reverse idler gear,shaft, bearings,thrust washers and retainer :check end play i. Install final drive j. Install mainshaft assembly k. Inspect, adjust, and reinstall shift cover, forks, levers, grommets, shafts, sleeves, detent mechanism, interlocks, and springs. l. Inspect, test, and replace transmission/transaxle sensors and switches. 4. Disassemble manual transmission clean and inspect Learning Objectives a. Inspect manual transmission gears / shafts b. Inspect manual transmission synchros / hubs / blocking rings / sleeves / inserts / springs c. Inspect manual transmission bearings and thrust washers d. Install transmission countershaft gear assembly e. Measure end play or preload (shim or spacer selection procedure) on transmission/transaxle shafts; perform necessary action. f. Install transmission mainshaft assembly g. Install clutch shaft assembly h. Inspect, adjust, and reinstall shift cover, forks, levers, grommets, shafts, sleeves, detent mechanism, interlocks, and springs. i. Inspect lubrication devices (oil pump or slingers) j. Inspect /repair or replace extension housing /case mating surfaces/bores/ bushings and vents k. Inspect /replace trans/transaxle gskts/seals and sealants/inspect sealing surfaces l. Inspect, test, and replace transmission/transaxle sensors and switches. 5. Define four wheel drive driveline components Learning Objectives a. Define part-time, full-time , auto, and AWD four wheel drive systems b. Service front hub and/or axle locking devices, and front wheel bearings. c. Analyze planetary gear transfer case power flow d. Analyze gear drive transfer case power flow e. Explain types of transfer case/ axle differential systems and concerns related to variations in tire circumference and/or final drive ratios. f. Remove and install transfer case g. Dsassemble ,service, and reassemble transfer case components h. Check drive assembly seals and vents; check lube level i. Inspect , adjust, and repair shifting controls, (mechanical, electrical, and vacuum j. Inspect transfer case shift control, bushings, mounts, levers, and brackets k. Diagnose , test, adjust, and replace electrical/ electronic components of 4X4 systems l. Diagnose noise, vibration, and unusual steering concerns; determine necessary action