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Hydroelectric Plant Mechanic I (6456)

Hydroelectric Plant Mechanic I

California State Personnel Board Specification

  • Schematic Code: PL70
  • Class Code: 6456
  • Established: 02/17/1966
  • Revised: 12/07/1972
  • Title Changed: 04/24/1974


Under direction, to perform mechanical maintenance and repair work on large hydroelectric generating and pumping plant equipment; and to do other related work.

Typical Tasks

Maintains, repairs, disassembles, and assembles large and complex equipment such as piping systems, gear boxes, drive mechanisms, pumps, compressors, hydraulic power and pressure units, refrigeration and air conditioning systems, valves, gates, trash racks, turbines, motors, and generators; tests, adjusts, services, and maintains various mechanical meters and gates used in measuring capacity, flow, pressure, temperature, and velocity of liquids and/or gases; performs welding, burning, cutting, and grinding as may be required; operates an overhead crane or assists in rigging as required; may use underwater diving equipment in connection with underwater inspection and repair of structures and facilities of the State Water Project.

Minimum Qualifications

Either I


Completion of a recognized apprenticeship as a hydroelectric plant mechanic or machinist. (Apprentices who are within 6 months of completing their apprenticeship program may be admitted to the examination, but they must present evidence of completion of a recognized apprenticeship before they may be appointed.)



One year of journeyperson experience maintaining and repairing heavy equipment used in hydroelectric generating or pumping plants.

Knowledge and Abilities

Knowledge of: Methods, materials, tools, and equipment used in maintaining, servicing, and repairing large turbines, generators, motors, pumps, valves, and intake structures used in large hydroelectric generating and pumping plants; techniques of arc and gas welding; methods, materials, tools and equipment used in repairing and servicing mechanical gauges and measuring devices; Safety Orders of the Division of Industrial Safety dealing with electrical, welding, rigging and mechanical systems; techniques used in performing rigging and operating a large overhead crane; mathematics normally required in this trade.


Ability to: Read and write English at a level required for successful job performance; estimate job time and required materials; read blueprints and work from plans and specifications; keep simple records and make reports; follow oral and written instructions; instruct and supervise unskilled assistants.

Additional Desirable Qualification

Education equivalent to completion of the twelfth grade.

  Updated: 6/3/2012
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