Heavy Equipment Mechanic (#RC3001)
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$29.08-$35.34 Hourly / $5,040.20-$6,126.39 Monthly / $60,482.43-$73,516.78 Yearly


Under direction, inspects, diagnoses, overhauls and makes repairs to diesel, hydraulic, road construction and other similar equipment; and does related or other work as required in accordance with Rule 3, Section 3 of the Civil Service Rules.


An employee in this class is responsible for the repair of heavy diesel, hydraulic, and other specialized equipment, including Public Works road construction equipment.


  • Inspects diesel, hydraulic, road construction, and other similar equipment in the field or shop. 
  • Disassembles and overhauls engines, differentials, transmissions, clutches, alternators, generators, starters, distributors, carburetors, steering mechanisms, brakes, hydraulic apparatus, and other assemblies. 
  • Inspects, repairs, and overhauls trucks, power shovels, tractors, air compressors, bulldozers, graders, ferries and other equipment. 
  • Rebuilds and tunes engines using testing equipment; sets tappets; replaces main and connecting rod bearings; inspects and repairs automatic and standard transmissions, universal joints, and differentials; relines and adjusts brakes. 
  • Shapes metal parts to precise dimensions within the class tolerance by means of a lathe or other precision equipment. 
  • Repairs hydraulic systems on construction equipment; tests and makes precision adjustments. Performs acetylene and electrical welding, and blacksmithing. 
  • Evaluates the condition of cooling systems, locates faults or defects, and makes necessary repairs. Prepares work reports as required. 
  • May train and inspect the work of Equipment Service Workers, Automotive Mechanic Apprentices, and/or Heavy Equipment Mechanic Apprentices.


Experience: Four years as a Heavy Equipment Mechanic Apprentice in San Joaquin County service. 

Experience: Four years of mechanic experience involving the repair of construction equipment and/or heavy trucks. 

Substitution: Experience as an Automotive Mechanic in San Joaquin County service may substitute on a year-for-year basis for a maximum of two years of the required experience. 

License: Possession of a valid California driver’s license at the time of application; depending on assignment, may be required to obtain a valid California Class B driver's license within six months of appointment, and to maintain such license while employed in this class.


Principles and practices of heavy equipment maintenance and repair, including diesel engines, dray lines, bulldozers, backhoes and similar equipment; methods, tools and standard practices of diesel and hydraulic equipment mechanics; principles of operation of heavy equipment and related systems; the use of test, welding and other shop equipment; the occupational hazards and safety precautions of the heavy equipment mechanics trade.


Diagnose trouble in diesel engines and heavy Public Works equipment; operate various testing and repair equipment and follow automotive and equipment diagrams; perform acetylene and electric welding; use tools, machines and testing instruments of the trade; understand and carry out oral and written instructions.


Mobility – frequent standing and walking; occasional pushing, pulling, balancing, bending, twisting, climbing, kneeling, squatting; Lifting/Carrying – frequently 50 pounds or less; occasionally 51 – 70 pounds; Dexterity – frequent handling, reaching, grasping, and fingering; Hearing/Talking – frequent hearing and speaking normal speech and speaking loudly over equipment noise; occasional hearing/talking on a radio; Visual – frequent use of good overall vision, at normal or corrected to normal acuity; frequent use of depth perception and peripheral vision; occasional reading and close-up work; Environmental – frequent exposure to dirt, dust, smoke, fumes, and odors; occasional exposure to varied weather conditions or working with hazardous materials; Emotional/Psychological – frequent concentration and working independently; Special Requirements – occasional working overtime, weekends, nights, holidays and/or emergency call-back; occasional travel.

San Joaquin County complies with the Americans with Disabilities Act (ADA) and, upon request, will consider reasonable accommodations to enable individuals with disabilities to perform essential job functions.

CLASS: RC3001; EST: 9/1/1960; REV: 2/10/2016;