DIET 2020 Syllabus
Subject Code
DIET
Course Number
2020
Course Title
Truck Drivetrains
Prerequisites
Prerequisites/Corequisites: DIET 1000, DIET 1010
Corequisites
Terms Offered
Offered Summer
Credit Hours
(4-5-6)
Course Description
This course introduces power train systems used on medium and heavy duty trucks. Topics include an introduction to power trains, clutches and flywheels, powertrain electronic systems, auto-shift mechanical transmissions, power take-offs, truck drive lines, differentials and final drives, torque converters, and automatic transmissions. Students must pay a $25 lab fee when registering for this course.
Course Outcomes
Introduction to Power Trains
Order Description
1 Demonstrate an understanding of the terms and definitions
2 Describe basic components of a power train and their functions
3 Demonstrate an understanding of the sequence for the transmission of power through a power
train
4 Demonstrate an understanding of the working applications of power trains
5 Describe types of gears found in power trains
6 Demonstrate an understanding of the formula for calculating gear ratios
7 Demonstrate an understanding of how to determine gear rotation
8 Demonstrate an understanding of the formula for calculating gear speed
9 Calculate gear ratio
10 Calculate gear rotation
11 Calculate gear speed
Clutches and Flywheels
Order Description
1 Demonstrate an understanding of the terms and definitions
2 Describe components of a basic clutch assembly
3 Describe parts of a flywheel
4 Demonstrate an understanding of the function of a flywheel
5 Describe parts of a dry type disc clutch
6 Describe types of clutches and their descriptions
7 Describe types of pressure plates
8 Demonstrate an understanding of the difference between a disengaged and an engaged clutch
9 Describe clutch linkage mechanisms and their functions
10 Perform inspection and adjustment of clutch linkages, cables, levers, brackets, bushings, pivot
springs, and safety switches (push and pull-type assemblies)
11 Check clutch pedal free play
12 Define conditions to look for during clutch inspection
13 Describe symptoms that occur when a clutch housing bore has excessive runout
14 Describe clutch malfunctions and probable causes
15 Identify causes of clutch noise, binding, slippage, pulsation, vibration, grabbing, dragging, and
chatter; determine needed action
16 Demonstrate an understanding of the purposes of a dual clutch disc
17 Perform adjustment of clutch linkage free travel
18 Perform adjustment of free travel on a pull type clutch
19 Remove a clutch assembly
20 Inspect a clutch disc
21 Check a clutch housing alignment, flywheel housing face, and bore runout
22 Inspect a pressure plate and cover
23 Inspect, adjust, lubricate, or replace release (throw out) bearings, sleeves, bushings, springs,
housing, levers, release fork, fork pads, rollers, shafts, and seals
24 Inspect, adjust, repair, or replace hydraulic clutch slave and master cylinders, lines, and hoses
25 Perform bleeding procedure for hydraulic clutch systems
26 Inspect a pilot bearing and pilot bushing
27 Perform reinstallation of a clutch assembly
28 Inspect, adjust, and replace a single disc clutch pressure plate and clutch disc
29 Inspect, adjust, and replace two plate clutch pressure plate, clutch discs, intermediate plate, and
drive pins/lugs
30 Inspect and/or replace clutch brake assembly
31 Inspect input shaft and bearing retainer; perform needed action
32 Inspect, adjust, and replace self-adjusting/continuous adjusting clutch mechanisms, clutch
pressure plate, and clutch disc
33 Inspect flywheel mounting area on crankshaft, rear main oil seal, and measure crankshaft end
play; determine needed action
34 Inspect flywheel, starter ring gear, and measure flywheel face and pilot bore runout; determine
needed action
Power Train Electronic Systems
Order Description
1 Demonstrate an understanding of diagnostic procedures
2 Demonstrate an understanding of how to retrieve fault codes
3 Demonstrate an understanding of how to clear fault codes
4 Check for proper clutch operation
5 Confirm proper clutch adjustment
6 Demonstrate an understanding of the clutch brake contact
7 Describe electrical pretests
8 Describe pneumatic pretests
9 Demonstrate an understanding of the power-up sequence test
10 Describe fault codes
11 Describe symptom driven diagnostics
12 Describe front box control test
13 Demonstrate an understanding of the gear display power supply test
14 Describe the electric shifter test
15 Describe the start enable relay test
16 Describe the starting gear engagement test
17 Describe the J-1939 data link test
18 Describe the auxiliary box test
19 Describe the up/down button test
20 Describe the neutral lock input test
21 Describe the splitter test
22 Describe the shift complaint test
23 Describe how to interpret wiring diagrams and schematics
Auto-shift Mechanical Transmissions
Order Description
1 Demonstrate an understanding of the terms and definitions
2 Demonstrate an understanding of the types of mechanical transmissions
3 Describe parts of a sliding gear transmission
4 Describe parts of a sliding clutch transmission top shaft
5 Describe parts of a front section countershaft
6 Describe parts of a transmission front section case with clutch housing
7 Describe parts of an auxiliary section of a transmission
8 Describe parts of a shift lever housing and reverse stop plunger
9 Describe parts of a shift bar housing
10 Describe parts of a remote shift control assembly
11 Demonstrate an understanding of the air flow for range setting
12 Indicate air flow in air lines for range shifting
13 Check transmission fluid level and condition and add proper type of coolant
14 Inspect for leakage and replace transmission cover plates, gaskets, seals, and cap bolts
15 Inspect seal surfaces and vents and repair as needed
16 Remove and disassemble a mechanical transmission
17 Inspect input shaft, gear, spacers, bearings, retainers, and slingers; determine needed action
18 Identify causes of transmission noise, shifting, lock up, jumping out of gear, overheating, and
vibration problems; determine needed action
19 Inspect, test, repair, or replace air shift controls, lines, hoses, valves, regulators, filters, and
cylinder assemblies
20 Inspect, adjust, and replace transmission shift lever, cover, rails, forks, levers, bushings, sleeves,
detents, interlocks, springs, and lock bolts/safety wires
21 Inspect transmission oil filters and coolers; replace as needed
22 Inspect speedometer components; determine needed action
23 Inspect transmission parts
24 Perform reassembly of a mechanical transmission
25 Disassemble a shifting bar housing
26 Inspect a shifting bar housing and parts
27 Reassemble a shifting bar housing and parts
28 Inspect and replace transmission mounts, insulators and mounting bolts
29 Inspect and adjust power take-off (PTO) assemblies, controls, and shafts; determine needed
action
30 Inspect and test the function of reverse lights, neutral start, and warning device circuits;
determine needed action
31 Perform inspection and testing of the transmission temperature gauge and sensor/sending unit;
determine needed action
32 Perform installation of a mechanical transmission
33 Test a mechanical transmission after rebuilding
34 Perform installation of an automated mechanical transmission
35 Test an automated mechanical transmission after rebuilding
36 Inspect and test the operation of automated mechanical transmission and manual electronic shift
controls, range and splitter solenoids, shift motors, indicators, speed and range sensors,
electronic transmission control units (ECU/TCU), neutral, in gear, and reverse switches, and
wiring harnesses; determine needed actions
37 Inspect and test operation of automated mechanical transmission electronic shift selectors, air
and electrical switches, displays and indicators, wiring harnesses, and air lines; determine
needed action
38 Use appropriate diagnostic tools and procedures to diagnose automated mechanical transmission
problems
39 Check and record diagnostic codes, clear codes, and interpret digital multimeter (DMM)readings;
determine needed actions
Power Take-offs
Order Description
1 Demonstrate an understanding of the terms and definitions
2 Define safe operation of PTOs
3 Identify three types of PTO guards and shields
4 Define three types of PTO systems
5 Demonstrate an understanding of the SAE standards for tractor PTO drives
6 Describe complaints and causes for noise, heat, and vibration in transmission-mounted PTOs
7 Describe troubleshooting PTOs for poor work rate
8 Describe complaints and causes for external oil leaks in PTOs
9 Describe troubleshooting PTOs for hard shifting
10 Describe troubleshooting PTOs for jumping out of gear
11 Describe troubleshooting power shift PTOs
12 Identify parts of a two gear, one speed PTO
13 Identify components of hydraulic and electric circuits in a power shift PTO
14 Identify parts of a PTO air shift system
15 Describe shift covers for transmission mounted PTOs
16 Demonstrate an understanding of the procedures for lubricating PTO systems
17 Identify questions that are relevant when selecting the proper PTO
18 Perform installation of a transmission mounted PTO
Truck Drive Lines
Order Description
1 Demonstrate an understanding of the terms and definitions in relation to vehicle suspension
2 Define two characteristics of a Hotchkiss drive
3 Demonstrate an understanding of the types of propeller shafts
4 Identify parts of a propeller shaft with shift yoke
5 Identify parts of a center bearing
6 Demonstrate an understanding of the difference between constant velocity, cross, and roller u-
joints
7 Identify parts of a cross and roller u-joint
8 Identify causes of driveshaft and universal joint noise and vibration problems; determine needed
action
9 Describe points on a drive train to check component angles
10 Measure driveline angles; determine needed action
11 Demonstrate an understanding of the acceleration and deceleration of a propeller shaft with
Cardon u-joints
12 Describe problems causing drive line noise or vibration
13 Inspect, service or replace driveshafts, slip joints, yokes, drive flanges, universal joints,
driveshaft boots and seals, and retaining hardware
14 Check phasing of all drive shafts
15 Inspect driveshaft center support bearings and mounts; determine needed action
16 Perform removal and replacement of a propeller shaft
17 Perform disassembly, inspection, and reassembly of a u-joint with a bolted end
18 Remove and replace a cross and roller u-joint
19 Install, align, and time a telescoping drive line
20 Balance a propeller shaft
Differentials and Final Drives
Order Description
1 Demonstrate an understanding of the terms and definitions
2 Describe types of differentials and final drives
3 Identify parts of a gear tooth
4 Describe methods used to evaluate gear tooth contact patterns
5 Identify parts of a differential
6 Identify parts of a planetary gear set
7 Describe planetary gear set components and their characteristics
8 Describe types of differential locks
9 Demonstrate an understanding of the purposes of a power divider
10 Demonstrate an understanding of the basic parts of a power divider
11 Demonstrate an understanding of the shifting mechanisms and their descriptions
12 Demonstrate an understanding of the difference between flared and compression fittings
13 Remove a differential assembly
14 Perform disassembly of a differential case and gear assembly
15 Clean and inspect a differential case and gear assembly
16 Identify causes of drive axle(s) drive unit noise and overheating problems; determine needed
action
17 Inspect and replace a differential case assembly including spider gears, cross shaft, side gears,
thrust washers, case halves, and bearings
18 Inspect and replace components of a locking differential case assembly
19 Inspect differential carrier housing and caps, side bearing bores, and pilot (spigot, pocket)
bearing bore; determine needed action
20 Measure ring gear run out; determine needed action
21 Inspect and replace ring and drive pinion gears, spacers, sleeves, bearing cages, and bearings
22 Measure and adjust drive pinion bearing preload
23 Measure and adjust drive pinion depth
24 Measure and adjust side bearing preload and ring gear backlash
25 Check and interpret ring gear and pinion tooth contact pattern; determine needed action
26 Inspect, adjust, or replace ring gear thrust block/screw
27 Reassemble a differential case and gear assembly
28 Remove, repair, and reassemble a differential carrier and power divider assembly
29 Inspect power divider (inter-axle differential) assembly; determine needed action
30 Inspect, adjust, repair, or replace an air operated power divider (inter-axle differential) lockout
assembly including diaphragms, seals, springs, yokes, pins, lines, hoses, fittings, and controls
31 Inspect, repair, or replace drive axle lubrication systems including pumps, troughs, collectors,
slingers, tubes, and filters
32 Check and repair fluid leaks
33 Inspect and replace drive axle housing cover plates, gaskets, sealants, vents, magnetic plugs,
and seals
34 Install a differential assembly in a differential housing
35 Disassemble a planetary gear assembly outer ends
36 Clean and inspect parts of a planetary axle
37 Reassemble a planetary gear assembly
38 Perform adjustment on a planetary gear assembly including bearing preload
39 Check drive axle fluid level and condition; determine needed service
40 Add the proper type of lubricant to drive axles as needed
41 Inspect and replace drive axle shafts
42 Perform removal and replacement of wheel assemblies
43 Check rear wheel seal and axle flange gasket; perform needed action for leaks
44 Identify causes of drive axle wheel bearing noise and check for damage; perform needed action
45 Clean, inspect, lubricate, and replace wheel bearings
46 Replace seals and wear rings
47 Inspect and replace retaining hardware
48 Perform adjustment of drive axle wheel bearings
49 Perform preventive maintenance on differential and final drives
50 Assemble an air line with reusable fitting (flared)
51 Assemble an air line with compression fittings
52 Inspect and test drive axle temperature gauge and sending unit/sensor; determine needed action
Torque Converters
Order Description
1 Demonstrate an understanding of the terms and definitions
2 Demonstrate an understanding of how a basic fluid coupling works
3 Identify parts of a torque converter
4 Describe torque converter parts and their functions
5 Define types of fluid flow in torque converters and their characteristics
6 Describe the operation of a twin-turbine torque converter
7 Describe the operation of a lock-up clutch torque converter
8 Perform draining and refilling procedures on a torque converter
9 Check for oil leaks
10 Test a torque converter
Automatic Transmissions
Order Description
1 Demonstrate an understanding of the terms and definitions
2 Identify major parts of an automatic transmission
3 Describe steps in oil pump and regulating valve operation
4 Describe low range, high range, and reverse range functions in an automatic transmission
5 Demonstrate an understanding of the characteristics of automatic transmission fluid
6 Describe the procedure for properly checking automatic transmission fluid
7 Demonstrate an understanding of in-vehicle transmission tests and their functions
8 Identify parts of a planetary gear system
9 Describe planetary gear system operation
10 Describe speed, torque, and directional functions of an automatic transmission and ways they
are accomplished
11 Identify tools and equipment required for automatic transmission overhaul
12 Describe parts normally replaced at each automatic transmission overhaul
13 Demonstrate an understanding of the important elements of cleaning and inspection
14 Describe special considerations for bearing inspection and handling
15 Identify transmission components and their inspection requirements
16 Describe make-ready procedures for removing or installing an automatic transmission
17 Demonstrate an understanding of the general rules for determining whether to reuse or replace
a part
18 Remove an automatic transmission from a vehicle
19 Disassemble an automatic transmission into subassemblies
20 Check end play on a torque converter assembly
21 Disassemble, clean, and inspect a torque converter assembly
22 Rebuild a stator assembly
23 Reassemble a torque converter assembly
24 Disassemble, clean, inspect, and reassemble a modulated lockup valve assembly
25 Disassemble, clean, inspect, and reassemble a low shift assembly
26 Disassemble, clean, inspect, and reassemble a control valve body assembly
27 Disassemble, clean, inspect, and reassemble an oil pump and front support assembly
28 Disassemble, clean, inspect, and reassemble a forward clutch and turbine shaft
29 Disassemble, clean, inspect, and reassemble a fourth clutch
30 Disassemble, clean, inspect, and reassemble a center support assembly
31 Disassemble, clean, inspect, and reassemble gear unit and main shaft assembly
32 Disassemble, clean, inspect, and reassemble an output shaft
33 Disassemble, clean, inspect, and reassemble a rear cover assembly
34 Disassemble, clean, inspect, and reassemble an adaptor housing and first clutch piston
35 Disassemble, clean, inspect, and reassemble a transmission housing
36 Reassemble an automatic transmission
37 Perform installation of an automatic transmission
38 Test an automatic transmission
39 Perform shift speed adjustments on an automatic transmission
40 Inspect and test operation of automatic transmission electronic shift controls, shift solenoids,
shift motors, indicators, speed and range sensors, electronic/transmission control units
(ECU/TCU), neutral, in gear, and reverse switches, and wiring harnesses
41 Inspect and test the operation of automatic transmission electronic shift selectors, switches,
displays, and indicators
42 Use appropriate diagnostic tools and procedures to diagnose automatic transmission problems
43 Check and record diagnostic codes, clear codes, and interpret digital multimeter (DMM) readings;
determine needed action