Maricopa Community Colleges  DIE110   19946-20086 
Official Course Description: MCCCD Approval: 07/22/08
DIE110 19946-20086 L+L 3 Credit(s) 5 Period(s)
Heavy Equipment Chassis and Brakes
Front end geometry, alignment, tire balancing, lubricants, power steering, drum and disc brakes, preventive maintenance, troubleshooting, and repair.
Prerequisites: None.
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MCCCD Official Course Competencies:
 
DIE110   19946-20086 Heavy Equipment Chassis and Brakes
1. Identify components and describe their functions in a basic brake system. (I)
2. Explain the principles of brake operation and factors that affect braking. (I)
3. Identify types of brake systems, and describe the operation of each basic component. (II, III, IV)
4. Perform routine maintenance and testing on common types of heavy equipment brake systems. (V)
5. Identify types and describe the fundamental operation of steering components and front-end geometry on heavy equipment. (VI)
6. Select and perform basic preventive maintenance and adjustments on steering and front-end components. (VI)
7. Diagnose and repair failures of power steering components. (VI)
8. Diagnose and repair failures of front-end components. (VI)
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MCCCD Official Course Outline:
 
DIE110   19946-20086 Heavy Equipment Chassis and Brakes
    I. Fundamentals of Brakes
        A. Coefficient of friction
          1. Factors affecting coefficient
            a. Material
            b. Condition of material
        B. Conversion of energy of motion to heat energy
          1. Methods of heat dissipation
          2. Effects of heat build-up
        C. Effect of speed and wright
        D. Use of leverage
          1. Transmit force and motion
          2. Increase mechanical advantage
        E. Examples of levers
          1. Slack adjuster
          2. Brake cam
          3. Brake shoe
          4. Wedge cam
        F. Compressed air as energy source
      II. Components of Basic Brake Systems
          A. Air compressor
            1. Gear or belt driven
            2. Pumps compressed air to reservior
          B. Reservoir
            1. Stores energy in form of compressed air
          C. Brake valve
            1. Driver operated
            2. Regulates air flow to brake chamber
          D. Brake Chamber
            1. Point at which energy of compressed air is transformed into mechanical force and motion
          E. Brake assembly
            1. Point at which mechanical force and motion is transformed into actual braking force
        III. Basic Brake Types
            A. Service brakes
              1. Air
              2. Air over hydraulic
              3. Drum and expanding shoe
                a. S cam
                b. Wedge cam
              4. Caliper type disc
            B. Parking/emergency brakes
              1. Automatic
              2. Manual
              3. Air
              4. Spring
              5. Drum and expanding shoe
              6. Disk and shoe
              7. External contracting band
              8. Caliper type disc
          IV. Brake Equipment
              A. Air compressor
              B. Governors
              C. Valves
                1. Treadle
                2. Single check
                3. Double check
                4. Relay
                5. Quick release
                6. Control
                7. Relief (safety)
                8. Two way
                9. Disconnect
              D. Indicator switches
                1. Low pressure
                2. Stoplight
                3. Warning
              E. Brake chambers
              F. Slack adjusters
              G. Reserviors
              H. Power clusters
                1. Air cylinder operation
                2. Hydraulic cylinder operation
              I. Wheel cylinders
              J. Tubing, hose and fittings
              K. Optional equipment
                1. Alcohol injector
                2. Air drier
            V. General maintenance and testing
                A. Balanced braking
                  1. Pneumatic
                  2. Mechanical
                B. Adjustments
                C. Leak detection
                D. Operational checks
                E. Safety checks
                F. Safety rules
                G. Troubleshooting
              VI. Steering Axles
                  A. Steering
                    1. Principles of steering geometry
                      a. Caster
                      b. Chamber
                      c. Toe-in
                    2. Effect of design and operating characteristics on basic steering geometry
                      a. King pin inclination angle
                      b. Turning radius (cross tube arms)
                      c. Frame angle
                      d. Weight transfer
                    3. Steering tire wear associated with improper geometry adjustments
                    4. Steering axles types
                      a. Rigid non-driving
                    1. I-beam
                    2. Tubular
                      b. Rigid driving
                    5. Manual steering gear types
                      a. Recirculating ball
                      b. Worm and roller
                      c. Cam and lever
                    1. Single lever
                    2. Double lever
                    6. Overhaul and adjustment of manual steering gear
                      a. Basic overhaul procedure including disassembly, inspection, and reassembly
                      b. Adjustments prior to and after installation of unit
                    7. Power steering gear types
                      a. Integral
                      b. Linkage
                      c. Individual power cylinder
                    8. Power cylinders
                      a. Mounted at tie-rod
                      b. Mounted at frame side rail
                    9. Control valves
                      a. Mounted between pitman arm and steering gear
                      c. Mounted in linkage
                    10. Inline boosters
                      a. Combined power cylinder and control valve
                      b. Air boost
                    11. Power steering pump types
                      a. Rotor
                      b. Roller
                      c. Slipper
                      d. Vane
                      e. Sleeve
                      f. Gear
                    12. Overhaul and adjustment of power steering components
                      a. Basic overhaul procedure including disassembly, inspection, and reassembly
                      b. Adjustments prior to and after installation of unit
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