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# DSL 606 - Hydraulics and Brakes

Credits: 6
Lecture Hours: 1
Lab Hours: 10
Practicum Hours: 0
Work Experience: 0
Course Type: Voc/Tech
The study of basic mobile hydraulics and vehicle brake systems. Introduces principles, components, fluid systems and circuits of hydraulic systems. Vehicle braking studies hydraulic and air brake systems.
Competencies
1. Examine the fundamentals of hydraulic ISO symbols.
1. Identify hydraulic component symbols.
2. Interpret the meaning of hydraulic symbols.
3. Draw schematics of each test stand using ISO symbols.
2. Calculate the force of a given cylinder under given pressures.
1. Compute the area of a piston.
2. Determine the force of the cylinder using the force-area pressure formula.
3. Compute the effective area on the rod side of the piston.
4. Identify the force of a cylinder retracting using the force-area pressure formula.
3. Inspect a hydraulic jack.
1. Analyze the seals on the pump and piston.
2. Examine the valves.
3. Trace the hydraulic oil passage ways.
4. Evaluate a gear pump for possible repairs.
1. Disassemble the gear pump.
2. Inspect the pump for wear patterns.
3. Explain the operation of the gear pump.
4. Determine necessary gear pump repairs.
5. Reassemble the gear pump.
5. Analyze a vane pump for possible repairs.
1. Disassemble the vane pump.
2. Identify this pump as a balanced or unbalanced pump.
3. Inspect the pump for wear patterns.
4. Identify necessary repairs.
5. Reassemble the vane pump.
6. Evaluate a piston pump for possible repairs.
1. Disassemble the piston pump.
2. Identify this pump as a radial or an axial piston pump.
3. Inspect wear patterns.
4. Identify necessary repairs.
5. Reassemble the piston pump.
7. Examine a hydraulic cylinder.
1. Disassemble the hydraulic cylinder.
2. Analyze the piston seals.
3. Inspect cylinder condition.
4. Determine necessary cylinder repairs.
5. Reassemble the hydraulic cylinder.
8. Assess pump GPM on test stands and machines.
1. Use the flow meter to obtain the GPM readings.
2. Compare flow rate GPM with specifications.
3. Evaluate the condition of the pump.
9. Evaluate the principles of circuits on test stands.
1. Observe the cushion action on a cylinder.
2. Compute extend and retract times of a regeneration circuit.
3. Explain the use of a pressure compensated flow control valve.
4. Demonstrate the use of a counterbalance valve.
5. Evaluate the action of pressure reducing valves.
6. Describe resistances in series.
10. Examine the fundamentals of machines.
1. Time the extension and retrction of the cylinders.
2. Compare the actual times to the specifications.
3. Analyze the times for the correct repair.
4. Check the cylinder drift of the cylinders.
11. Evaluate the principles of brakes.
1. Explain the factors the effect braking.
2. Describe friction.
3. Determine the effects of speed and weight.
4. Define the differences between trucks and tractors.
5. Identify hydraulic brake functions.
12. Analyze the fundamentals of a brake system.
1. Identify major components of a brake system.
2. Explain the operation of a dual circuit brake system.
3. Compare operations of disc and drum brakes.
4. Describe the operation of the parking brake.
5. Interpret the operation of ABS.
6. Define brake balance.
13. Assess the drum brake rebuild procedure.
1. Remove drum brakes.
2. Inspect lining and components.
3. Assemble drum brakes.
4. Adjust the drum brakes.
14. Assess the disc brake rebuild procedure.
1. Remove brake pads.
2. Inspect brake pads and components.
3. Assemble the disc brakes.
4. Adjust the disc brakes.

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