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United Rocks Products / Maintenance Mechanic - Irwindale, CA

Date: Apr 9, 2021

Country: Irwindale, California, US, 91706

Company: Colas

***Hourly, Union***



United Rock Products is a part of Sully-Miller Contracting Co., a company with nearly 100 years in the construction industry. Sully-Miller is a subsidary of the Colas Group, a worldwide leader in the infastructure construction and maintenance. If you're motivated, dedicated and looking for a challenging career in the construction industry, it's time to join the United Rock Products team. Great employees made us the industry leader. We strive above all to offer a work environment that interests, challenges and motivates. This includes opportunities to grow, competitive salaries and benefits, and a workplace culture that values the contributions of each individual. These human resource practices explain why many employees have been with United Rock Products for decades.




  • Examines and diagnoses problems, and repairs according to generally accepted methods.  Discusses extensive or difficult in depth repairs with Foreman and/or Site Manager.  
  • Performs routine scheduled maintenance as outlined by the Foreman and/or the Site Manager 
  • Removes components for repair or replacement such as, but not limited to; motors, gearboxes, pulleys, bearings, rollers, conveyor belts, v-belts, pumps, screens, crushers etc. 
  • Disassembles components, inspects parts for wear, and determines cause of failure. 
  • Troubleshoots and repairs hydraulic systems, and components. 
  • Inspects and replaces parts such as crusher liners, screen media, etc. 
  • Overhauls or rebuilds serviceable components 
  • Performs major welding and cutting -- must pass a welding/cutting test (certification strongly preferred). 
  • Replaces and or repairs chute liners/wear plate, able to fabricate steel in or out of the field for proper fit.  
  • Recommends parts for repair 
  • Perform post repair verification/start up  
  • Will perform clean-up as necessary to keep tools, equipment, and working areas clean, orderly, and safe. 
  • Other duties as assigned by the Foreman and/or Site Manager  



  • 5 years minimum experience or similar industry experienced preferred
  • Must have knowledge of welding material, welding properties, and various type of metals 
  • Must have welding experience
  • Must be able to perform bracing, welding, arc-welding and cutting tasks 
  • Must know how to use tools required for the job 
  • Must be able to change crusher liners without guidance of the Foreman and/or Site Manager 
  • Must be able to independently complete major mechanical tasks associated with aggregate business including replacing screen bearings and mechanically repairs to crushers 
  • Must be able to make independent judgments on the care of the equipment and perform the necessary task to solve the issue 
  • Must be able to weld, horizontal, vertical, and overhead
  • Current or previous welder certification strongly preferred  
  • Ability to use necessary tools
  • Must understand all of your controls and have experience with various types of equipment including man lifts, fork lifts, telehandlers, scissor lifts, etc. 
  • Must have a valid driver’s license and be able to drive company vehicle
  • Thoroughly understands MSHA and CALOSHA regulations
  • Must have a strong work ethic and be team oriented with strong focus on safety and environmental compliance
  • Ability to understand and follow Company Handbook and Safety Policies
  • Ability to work well with others
  • Must have a strong mechanical aptitude
  • Must be able to follow oral and written plans and directions


Colas Inc.and its subsidiaries (Sully-Miller) are an Equal Opportunity Employer. For details on the specifics of this commitment, please click here EEO document.  If you need accomodation to access the information provided on this website, please contact Colas Inc. 973-290-9082 or send an email to ColasRecruiter@colasinc.com.  

Nearest Major Market: Los Angeles