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Standards |
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R State Standard £ Institutionally Developed College: n/a |
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DET 234 - Heavy Equipment Power Train
Systems II |
Course Description
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A continuation of DET 233, introducing powertrains
used on heavy equipment such as bulldozers, excavators, wheel loaders, and
back-hoe loaders. Classroom and lab instruction on components and
systems with use and interpreting testing and diagnosing equipment are highly
emphasized. Topics include: torque converters,
hydraulically shifted transmissions, electronic transmissions, hydrostatic
transmissions, failure analysis, and terminology. |
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Competency Areas |
Hours
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Torque Converters |
Class |
3 |
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Hydraulically Shifted Transmissions |
D. Lab |
2 |
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Electronic Transmissions |
P. Lab/O.B.I. |
3 |
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Electronic Transmissions |
Credit |
5 |
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Failure Analysis |
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Terminology |
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Prerequisite: |
DET 233 |
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Corequisite: |
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Competency |
After
completing this section, the student will: |
Hours |
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Class |
D.Lab
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P.Lab/ O.B.I. |
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TORQUE CONVERTERS
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6 |
5
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7 |
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Understand basic principles and components: impeller, turbine,
and stator (simple and two stage). |
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Describe how it works: vortex flow, stall, torque
multiplication, and lock-up clutches |
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Understand testing and troubleshooting: converter in pressures,
converter out pressures |
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HYDRAULICALLY SHIFTED TRANSMISSIONS
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6 |
5
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7 |
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Describe clutch engagement chart |
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Describe power flow through transmission |
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Describe control of clutch engagement |
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Describe accumulator operations |
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Describe rate of shift controls |
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Understand clutch pressures (trace) |
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Describe on-coming clutch and off-going clutch |
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Describe pressure gauge testing |
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Describe hydraulic valving |
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Understand oil flow to clutches |
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Describe hydraulic reverses |
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Understand counter shaft (constant mesh) |
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Describe planetary transmissions |
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Describe troubleshooting methods |
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ELECTRONIC TRANSMISSIONS
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6 |
5
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7 |
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Understand basic principles |
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Describe electronically controlled hydraulic valves |
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Understand F=PxA |
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Understand pressure drop through an orifice |
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Describe fundamentals of spring operation |
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Describe fundamentals of solenoid operation |
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Describe current vs. spring and force vs. orifice relationship |
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Describe current vs. pressure relationships |
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Describe electronic over hydraulic systems |
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Describe electronic over air over hydraulic systems |
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Describe sensing and operational control |
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Identify load sensing |
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Understand engine fuel control interface |
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Describe speed sensing |
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Describe torque sensing |
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Identify manual and automatic control |
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Describe troubleshooting: with diagnostic unit, without
diagnostic unit, and component isolation procedures |
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HYDROSTATIC TRANSMISSIONS
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6 |
3
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6 |
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Understand basic principles |
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Understand displacement/flow relationships |
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Identify types of gear, axial piston swash plate, and cam lobe |
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Describe open loop hydrostatics |
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Describe closed loop hydrostatics: fixed-fixed combinations;
variable-fixed combinations; fixed-variable combinations, and
variable-variable combinations |
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Identify charge circuit |
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Understand lubrication circuit: pump, motor, forward, neutral, and
reverse |
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Define manual feedback control |
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Define electronically controlled |
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Describe braking system: fail safe and manual systems |
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Describe testing and troubleshooting: proper use of gauges;
accuracy of gauges; and failure analysis |
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Describe repair cautions: cleanliness; filling oil lines, and
oil types |
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FAILURE ANALYSIS
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3 |
2
|
3 |
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Understand importance of stress |
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Understand planning for strength |
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Describe failure modes |
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Describe bending fractures |
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Describe torsional failures |
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Understand adhesive and abrasive wear |
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Describe pitting and spalling failures |
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Understand frettage, cavitation,
and corrosion |
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TERMINOLOGY
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3 |
0
|
0 |
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axles, axles (hydrostatic drive), backlash, band-type clutches, barrel
cylinder, bearing loads, bearing, bearings (ball), bearings (needle),
bearings (roller), belt alignment, belt drives, belt friction, belt tension,
belts, bevel gears (plain), bevel gears (spiral), cam drives, chain drives,
flywheel, gear, gear train, gear pump, hydraulic, hydrostatic, hydrostatic
drive, idler gear, impeller, input shaft, jump clutches, cam lobe motor,
clutch, clutch pac, collar shift transmission,
countershaft, crank arm, crank wheel, dampeners, differentials, direct drive
transmission, disk clutch, electrical clutch controls, endplay, final drive,
fluids, fluid coupling, sun gear, synchromesh transmissions, servo cylinder,
lubrication, mechanical manual transmissions, output shaft, overdrives, perma-clutch, pinion drives, planetary drives, planetary
gears, pneumatic clutches, power shift transmissions, power take-off, power
train, pump, rack and pinion gears, ratio, repair indicators, reverser unit,
rim, ring gear, roller chains, speed (increasing/decreasing), swash plate,
tension, torque, torque converter, universal joints, v-belts, variable-speed
belt drives, wear, wear plate, worm gears, shear pins, slip clutches, and
spur |
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Suggested Resources |
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Media |
Note: Please adhere to the APA Formatting
and Style Guidelines. |
|
Web
Manuals |
Mitchell
Information Systems. (2008). “Tractor Trailer.net”. |
|
Print |
Multistate
Academic and Vocational Curriculum Consortium. (2007). “Diesel
Technology Series”. |
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Norman, Andrew
& others. (2006). Diesel Technology. |
|
|
Norman, A. / Corinchock, J. / Bennett,S. ( 2005 ) Heavy Duty Truck
Systems 4th Ed, Delmar Pub. |
|
|
Huzij/ Bennett. (2009). Heavy Equipment
Systems. |
Posted: 10/15/08