DSL 604 - Power Equipment Hydraulics

1. Evaluate 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. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8.  Examine different styles of hydrauilc valves
   1. Determine type of valving in the system
   2. Disassemble and inspect a mechanical valve
   3. Disassemble and inspect an electric hydraulic valve
   4. Test the function of a electric and mechanical hydraulic valve
9. Examine the fundamentals of machines.
   1. Time the extension and retraction 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.