Skytech

Industry Training

ST42 Heavy Duty Systems Maintenance, Troubleshooting and Repair (3 days)

The student is able to recommend repair of a cranking systems following manufacturers recommendations. Upon successful completion, the student is able to: Define the purpose and fundamentals of cranking systems. Describe the construction features of cranking systems. Perform inspecting, testing, and diagnostic procedures of a cranking system on mobile equipment.

Module Content:

1. Define the purpose and fundamentals of cranking systems.
   • battery
   • cables and connectors
   • switches, relays, condensers, and solenoids
   • thermal protection
   • starter drives
2. Describe the construction features of cranking system components.
   • cranking motors
     • configuration
     • internal circuits
     • thermal protection
   • starter drives
     • overrunning clutch
     • spragg
     • ramp and roller
     • posi-torque
   • control devices
     • relays
     • solenoids
     • series-parallel switch
     • master disconnect
     • pre-lubrication starting circuit
     • neutral safety switch
3. Explain the principles of operation of cranking systems and components
   • electromagnetic principles
   • cranking motors
     • series
     • series-shunt
     • series parallel
     • counter-electromotive force effect on current flow
     • temperature effect on load and torque output
     • configuration adjustment
     • thermal protection
   • drives
     • overrunning clutch
     • spragg
     • ramp and roller
     • posi-torque
   • control devices
     • relays solenoids
     • series-parallel switch
     • master disconnect
     • pre-lubrication starting circuit
     • neutral safety switch
4. Perform inspection, testing, and diagnostic procedures following manufacturers recommendations and perform assigned operations for cranking motors and control devices
   • outline the recommended diagnostic sequence for cranking system malfunctions
   • perform battery condition tests
   • perform cranking circuit current draw and voltage drop tests
   • identify specific cranking system faults from test results
   • perform a demonstration of cranking no-load bench test
   • perform cranking component tests
   • perform a demonstration of relay and solenoid testing
   • perform component failure analysis
   • outline the recommended procedures for boosting multiple batteries
     • 6 volt
     • 12 volt
     • 24 volt
   • perform ring gear inspection
     • drive gear and ring gear
     • starter gear reduction
5. Recommend reconditioning or repairs following manufacturers recommendations and perform assigned operations for cranking motors and control devices
   • perform disassembly and reassembly procedures of cranking motors

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Sudbury, Ontario
Canada P3A 3V8

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