7323-Heavy Duty Mechanic/Automotive Machinist (2024)

Job classification

TitleHeavy Duty Mechanic/Automotive Machinist
Overtime eligibility Covered (Non-Z) - Nonexempt
Labor agreement Auto Machinist, Local 1414
Effective dateJune 18, 2024

Current compensation plan

Effective: Jul 01, 2024

See Historic and future compensation information for this class

Step: Step 1
Rate /hr: $59.5500
Rate /biweekly: $4,764.00
Rate /year: $123,864

Job description



Title: Heavy Duty Mechanic/Automotive Machinist

Job Code: 7323


Under general supervision, performs skilled machinist work in the maintenance, repair and overhaul of heavy-duty and off-road vehicles and power-driven equipment, such as diesel trucks and buses, firefighting vehicles, compressors, generators, graders, backhoes, tractors, small engines (lawn mowers, etc.) and electric motors (on carts, etc.) and performs related duties as required.


7323 Heavy Duty Mechanic/Automotive Machinist is a journey level class. The 7323 Heavy Duty Mechanic/Automotive Machinist is distinguished from the 7313 Automotive Machinist in that the latter works on transit vehicle components. The 7323 Heavy Duty Mechanic/Automotive Machinist is distinguished from the 7315 Automotive Machinist Assistant Supervisor in that the latter exercises work direction over a group of subordinate Automotive Machinists.



According to Civil Service Commission Rule 109, the duties specified below are representative of the range of duties assigned to this job code/class and are not intended to be an inclusive list.

1. Maintains, repairs, overhauls, and services heavy-duty and off-road vehicles and power-driven equipment using hand tools, power tools and machine tools such as lathes, drill presses, grinders, boring bars, valves refining tools and other machine tools.

2. Designs, fabricates and welds parts.

3. Maintains records of equipment mileage, service/repair logs, materials and parts logs, and equipment and parts orders.

4. Responds to incoming emergency calls and may go to the site of the breakdown; may tow vehicles.

5. Inspects, tests, and reviews vehicles and equipment as part of the preventive maintenance program.

6. Diagnoses malfunctions using test equipment, manufacturers� specifications and repair manuals, and observation both in the shop and in the field in order to determine needed repairs.

7. Orders supplies, parts and materials necessary for the maintenance, repair and servicing of equipment and vehicles.

8. Drives city vehicles and operates equipment to diagnose malfunctions and to conduct final inspection of work completed.


Knowledge of: Heavy duty mechanics and the functioning of various mechanical, hydraulic and pneumatic assemblies and structures in heavy duty and off-road vehicles and power-driven equipment to be able to disassemble parts, evaluate malfunctions and make major repairs and overhauls; preventive maintenance; the operation and safety requirements of the machining and welding equipment, use of protective gear with all power equipment, and maintenance of a safe working environment and regulations concerning the handling of hazardous materials and toxic waste.

Ability or Skill to: Safely and efficiently use hand, power and machinist tools necessary to repair and overhaul various mechanical, hydraulic and pneumatic assemblies of heavy duty vehicles and equipment including assorted hand tools, measuring instruments, pneumatic tools, alignment rack, machine tools such as lathes, drill presses, valve facers and reseaters, grinders, boring bars and welding and cutting equipment; troubleshoot, diagnose and analyze mechanical, hydraulic and pneumatic malfunctions using test equipment and repair manuals; properly use volunteers, ohmmeter, ammeters, battery load testers, etc., to test electrical systems and computer control systems and to make precise measurements; read and use specifications and repair manuals provided by equipment manufacturers, apply precise measurements, and use appropriate parts and repair procedures as specified; communicate effectively and tactfully with co-workers and supervisors to solve problems and to complete written shop and vehicle operating records.


These minimum qualifications establish the education, training, experience, special skills and/or license(s) which are required for employment in the classification. Please note, additional qualifications (i.e., special conditions) may apply to a particular position and will be stated on the exam/job announcement.


High school diploma or equivalent (GED or High School Proficiency Examination).


A combination of journey-level experience and/or apprenticeship training as an automotive machinist or heavy-duty mechanic totaling six (6) years in which the major duties were disassembling, repairing, overhauling and installing mechanical, electrical and hydraulic assemblies in heavy duty and off-road vehicles and power-driven equipment. To be considered qualifying, this experience must include the use of machine tools such as valve re-facers, hydraulic and drill presses, lathes and grinders.

License and Certification:

Possession of at least a Class C (or III) driver license at the time of application; ability to obtain a Class B (or II) driver license and Medical Certificate at the time of appointment.

Positions at some city departments require that the candidate must be able to obtain a Class A (or I) driver license with Medical Certificate within twelve (12) months of the time of appointment. Failure to maintain the required license may be cause for termination.


Completion of a CA Division of Apprenticeship Standards recognized Automotive Machinist apprenticeship program as evidenced by issuance of a Certificate of Completion of the apprenticeship program under the appropriate authority will substitute for the six (6) years combined work experience.


Nature of work: involves some physical effort and considerable dexterity in the use of the fingers, limbs and body; continuous exposure to physical and working conditions where minor injuries may occur. May be required to work nights, weekends and/or holidays.


To: 7315 Automotive Machinist Assistant Supervisor





To accurately reflect the current tasks, knowledge, skills & abilities, and minimum qualifications.



Standard information

Disaster service work

All City and County of San Francisco employees are designated Disaster Service Workers through state and local law (California Government Code Section 3100-3109). Employment with the City requires the affirmation of a loyalty oath to this effect. Employees are required to complete all Disaster Service Worker-related training as assigned, and to return to work as ordered in the event of an emergency.

Historic and future compensation

7323-Heavy Duty Mechanic/Automotive Machinist (2024)


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