DIET 2011 Syllabus

Powertrain Theory and Principles
Order           Description
   1               Describe clutches
   2               Describe manual transmissions
   3               Describe power shift transmissions
   4               Describe hydrostatic drives
   5               Describe torque converters
   6               Describe differentials
   7               Describe final drives
   8               Describe power take-offs
   9               Describe special drives
  10              Describe gear ratios
  11              Identify types of gearing - straight cut spur, helical cut spur, herringbone, bevel, spiral bevel,
                    hypoid, and planetary     
  12              Demonstrate the basic operation of sun drive and carrier drive compound gears
  13              Demonstrate basic principles of rack and pinion gears
  14              Describe anti-friction bearings - ball, roller, and needle
  15              Perform preload and endplay design reasoning and setting procedures
  16              Perform backlash
  17              Define F = P x A
  18              Demonstrate what tools to use and their proper storage

Clutches
Order           Description
   1               Describe clutch discs and plates
   2               Describe solid and button clutch disc types
   3               Demonstrate the clutch pressure plate
   4               Identify clutch springs
   5               Describe heat cracks
   6               Perform clutch adjustments for free play, pilot shaft, pilot bearing, and throwout bearing
   7               Demonstrate multiple disc clutches and the relationship of the number of discs and plates to the
                    output torque
   8               Demonstrate the effect of pressure on torque
   9               Describe wet and dry clutch types
  10              Demonstrate clutch disc and clutch plate material
  11              Describe clutch wear patterns
  12              Establish band clutches and their basic operation
  13              Identify forward and reverse band clutches as well as their materials and wear patterns
  14              Demonstrate the basic types (roller, cam, and sprag), principles, and operation of overrunning
                    clutches

 

Manual Transmissions
Order           Description
   1               Understand general principles
   2               Demonstrate sliding gear operation and power flow through all gears
   3               Demonstrate collar shift operation and power flow through all gears
   4               Describe synchromesh operation and types of synchronizer units
   5               Demonstrate shifting controls such as forks, rails, and cams
   6               Demonstrate endplay, preload, fork, and cam adjustments
   7               Understand troubleshooting trees and cause and effect charts

 

Drive Shafts
Order           Description
   1               Understand hook joint and constant velocity joint connections
   2               Demonstrate effects of angles of drive shafts
   3               Perform multiple joint timing
   4               Describe mid-ship supports
   5               Perform drive shaft repair
   6               Describe drive shaft failure analysis

 

Differentials
Order           Description
   1               Understand basic differential operation
   2               Describe pinion gears, ring gears, and spider (bevel) gears
   3               Demonstrate mechanical, hydraulic, and automatic (no spin) differential locking methods
   4               Perform cone point and backlash setting adjustments

 

Final Drives
Order           Description
   1               Identify rigged axle (full-floating and semi-floating), flexible axle, pinion drive (pinion/bull
                    gear), inboard planetary, and outboard planetary final drive units
   2               Describe mechanical, hydrostatic, and speed lock-out front wheel drives
   3               Describe front to rear ratios, tires and rolling radius, and front/rear disconnects of four wheel
                    drive

Special Drives
Order           Description
   1               Demonstrate belt drive tension, wrap, crown, sizing, and types (flat, v-belt)
   2               Demonstrate special drive types, size, and failure analysis

 

Final Drive Failure Analysis
Order           Description
   1               Understand importance of stress
   2               Describe planning for strength
   3               Establish failure modes
   4               Describe bending fractures
   5               Demonstrate torsion failures
   6               Identify adhesive and abrasive wear
   7               Demonstrate pitting and spalling failures
   8               Demonstrate frettage, cavitation, and corrosion

 

Torque Converters
Order           Description
   1               Understand the basic principles and components (impeller, turbine, and stator) of the torque
                    converter
   2               Demonstrate how the torque converter functions including vortex flow, stall, torque
                    multiplication, and lock up
   3               Demonstrate testing and troubleshooting of the torque converter using converter in and out
                    pressures

 

Hydraulically Shifted Transmissions
Order           Description
   1               Understand the basic principles of hydraulic transmissions including multiple discs, planetary
                    gearing, and multiple clutch operation
   2               Describe clutch engagement charts
   3               Demonstrate power flow through the transmission
   4               Demonstrate control of clutch engagement
   5               Demonstrate accumulator operations
   6               Describe rate of shift controls
   7               Understand and demonstrate clutch pressures
   8               Demonstrate on-coming clutch and off-going clutch
   9               Perform pressure gauge testing
  10              Demonstrate hydraulic valving
  11              Demonstrate oil flow to clutches
  12              Describe hydraulic reverses
  13              Demonstrate counter shaft (constant mesh) design
  14              Describe planetary transmissions
  15              Demonstrate transmission troubleshooting methods

 

Electronic Transmissions
Order           Description
   1               Understand the basic principles of electronic transmission operation
   2               Describe electronically controlled hydraulic valves
   3               Understand F = P x A
   4               Demonstrate pressure drop through and orifice
   5               Describe fundamentals of spring operation
   6               Describe fundamentals of solenoid operation
   7               Demonstrate current vs. spring and force vs. orifice relationship
   8               Demonstrate current vs. pressure relationships
   9               Demonstrate electronic over hydraulic systems