STANDARD COMPETENCIES:

 

 1. Identify system fluid type.

 2. Identify causes of pump failure, unusual pump noises, temperature, flow, and leakage problems; determine needed action.

 3. Determine pump type, rotation, and drive system.

 4. Remove and install pump; prime and/or bleed system.

 5. Inspect pump inlet for restrictions and leaks; determine needed action.

 6. Inspect pump outlet for restrictions and leaks; determine needed action.

 7. Pressure test system safety relief valve; determine needed action.

 8. Perform control valve operating pressure and flow tests; determine needed action.

 9. Inspect, test, and adjust valve controls (electrical/electronic, mechanical, and pneumatic).

 10. Identify causes of control valve leakage problems (internal/external); determine needed action.

 11. Inspect pilot control valve linkages, cables, and PTO controls; adjust, repair, or replace as needed.

 12. Identify actuator type (single/double acting, multi-stage/telescopic, and motors).

 13. Identify the cause of seal failure; determine needed repairs.

 14. Identify the cause of incorrect actuator movement and leakage (internal and external); determine needed repairs.

 15. Inspect actuator mounting, frame components, and hardware for looseness, cracks, and damage; determine needed action.

 16. Remove, repair, and/or replace actuators in accordance with manufacturers¿ recommended procedures.

 17. Inspect actuators for dents, cracks, damage, and leakage; determine needed action.

 18. Purge and/or bleed system in accordance with manufacturers, recommended procedures.

 

 

 TOPICAL OUTLINE:

 

  I.      Hydraulic Pumps

          A.      Displacement of Pumps

          B.      Types of Pumps

          C.      Gear Pumps

          D.      Vane Pumps

          E.      Piston Pumps

          F.      Pump Efficiency

          G.      Pump Failures and Remedies

  II.     Hydraulic Valves

          A.      Relief Valves

          B.      Pressure Reducing Valves

          C.      Pressure Sequence Valves

          D.      Unloading Valves

          E.      Check Valves

          F.      Rotary Valves

          G.      Spool Valves

          H.      Electro-Hydraulic Valves

          I.      Flow Control Valves

          J.      Flow Divider Valves

          K.      Miscellaneous Valves

          L.      Valve Failures and Remedies

          M.      Hydraulic Cylinders

          N.      Piston Cylinders

          O.      Vane Cylinders

          P.      Maintenance of Cylinders

  III.    Hydraulic Motors

          A.      Gear Motors

          B.      Vane Motors

          C.      Piston Motors

          D.      Motor Efficiency

          E.      Motor Failures and Remedies

  IV.     Hydraulic Accumulators

          A.      Uses of Accumulators

          B.      Pneumatic Accumulators

          C.      Weight-Loaded Accumulators

          D.      Spring-Loaded Accumulators

  V.      Reservoirs, Oil Coolers, Hoses, Pipes, Tubes and Coupler

          A.      Quick Disconnect Couplers

          B.      Hydraulic Seals

          C.      Uses of Seals

          D.      Types of Seals

          E.      Seal Failures and Remedies