Heavy Diesel Plant Mechanics - St Mary's NSW
Oversee maintenance operations, ensuring the reliability and efficiency of our specialist plant and equipment.
About Keller Australia
We are Australia's leader in geotechnical solutions and proud to be one of the globally connected companies of Keller, the world's largest geotechnical engineering contractor.
We have delivered industry leading foundations and ground improvement solutions to the building, construction, and mining industries in Australia for over 60 years.
About the role
We are seeking Heavy Diesel Plant Mechanics to oversee maintenance operations, ensuring the reliability and efficiency of our specialist plant and equipment.
Key Responsibilities
Servicing and maintaining heavy plant and mobile equipment
Skilled in diagnosing and repairing diesel engines
Proficient in working with hydraulic systems, including pumps, valves, and cylinders
Experienced in mechanical repairs to drivetrains, transmissions, and braking systems
Competent in basic electrical fault-finding on plant equipment
Able to perform both planned maintenance and breakdown repairs efficiently
Adheres to safe work practices, isolation procedures, and workshop standards
Knowledgeable in plant maintenance schedules and maintaining accurate documentation
Ensure all maintenance work complies with HSEQ policies & safety standards
Maintain strong relationships with internal teams, suppliers & subcontractors
Provide technical support and ensure work meets Keller's quality standards
Able to carry out day-to-day hands‐on fitter duties alongside leading responsibilities
About you




Trade-qualified Mobile Plant, Heavy Diesel Vehicle Mechanic (Certificate III or equivalent)
Strong experience in similar environments
Hands‐on experience across a wide range of heavy machinery equipment
Diagnostic, hydraulic, mechanical, electrical, and diesel engine repair skills
Proven experience in component and full machine rebuilds, overhauls, shutdowns, and preventative maintenance to OEM standards
Confident working independently onsite, managing servicing schedules, breakdowns, parts procurement, and maintenance priorities
Additional skills in fabrication, fitting, machining, welding (MIG, oxy, plastic), and auto‐electrical diagnostics (advantageous)
Strong commitment to safety, reliability, and maintaining fleet uptime full Australian working rights
Why work with us
Job stability with a global leader
Flexible working environment
A strong commitment to learning and development
Cooperative and supportive team culture
Contribute to sustainability improvements in construction
Knowledge‐sharing from global experts
Fair employment practices with a focus on promoting from within
Exposure to innovative projects and career progression opportunities
Equal Opportunity Statement
Keller Australia is an equal opportunity employer, and we support diversity in our workforce.
Applications from people of culturally and linguistically diverse backgrounds; equity target groups including women, people with disabilities, people who identify as LGBTI+; and people of Aboriginal and Torres Strait Islander descent, are encouraged to apply.
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📌 Heavy Diesel Plant Mechanics (New South Wales)
🏢 Keller Ground Engineering
📍 New South Wales