Job Description

Bothar Boring and Tunnelling – Williamstown VIC

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Location: Tennyson Street, Williamstown, VIC, 3016

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Employment Type: Full-time

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Applications Open: 19 August 2026

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Applications Close: 18 September 2026

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About Us

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Bothar is a specialist contractor delivering complex tunnelling, pipeline and civil infrastructure projects across Australia, with particular expertise in microtunnelling.

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About the Role

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We are seeking an experienced TBM Mechanical Engineering Technician with specialist experience in Herrenknecht AVN microtunnelling machinery to join our Equipment and Maintenance team.

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Working alongside project teams, TBM Operators and mechanical personnel, you will provide technical and mechanical support across workshop and project environments to support the reliability and availability of tunnelling equipment.

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Due to the specialised and technically complex nature of the equipment, extensive hands‐on experience maintaining and repairing Herrenknecht AVN microtunnelling machines is essential.

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Key Responsibilities

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- Provide specialist mechanical and technical support for Herrenknecht AVN microtunnelling machines and associated equipment.
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- Perform servicing, inspections and preventative maintenance in accordance with OEM requirements and maintenance schedules.
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- Diagnose and troubleshoot faults across TBM mechanical, hydraulic, lubrication, cooling and slurry systems.
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- Repair, replace and adjust mechanical and hydraulic components, including pumps, motors, cylinders, valves and gearboxes.
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- Inspect and maintain cutterhead components and undertake cutter tool and roller replacement as required.
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- Undertake component rebuilds, major maintenance and equipment refurbishment.
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- Assist with the assembly, installation,



testing and commissioning of AVN machines and associated systems.
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- Read and interpret mechanical drawings, hydraulic schematics, technical specifications and OEM documentation.
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- Use mechanical testing, measuring and diagnostic equipment to assess component and system condition.
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- Assist with technical investigations into recurring equipment failures, reliability issues and mechanical performance.
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- Provide technical input into equipment repairs, modifications and improvements.
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- Provide specialist mechanical support during TBM launch, tunnelling, breakthrough, recovery and demobilisation where equipment issues arise or technical assistance is required.
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- Coordinate maintenance and repair activities with project personnel to minimise equipment downtime.
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- Maintain accurate maintenance, inspection, testing and commissioning records.
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About You

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- A relevant technical or engineering qualification, or equivalent demonstrated technical expertise in specialist microtunnelling machinery.
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- Extensive hands‐on experience in the maintenance, repair and technical support of Herrenknecht AVN microtunnelling machines.
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- Demonstrated experience with Herrenknecht AVN mechanical and hydraulic systems, cutterhead components, slurry systems, pumps, jacking systems and associated tunnelling equipment.
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- Demonstrated experience diagnosing and rectifying complex mechanical and hydraulic faults on microtunnelling equipment.
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- Experience with the assembly,



installation, testing and commissioning of TBMs and associated equipment.
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- Experience undertaking preventative, pre-drive and post-drive maintenance on microtunnelling machinery.
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- Robust understanding of pipe‐jacking and slurry microtunnelling systems and associated equipment.
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- Ability to read and interpret mechanical drawings, hydraulic schematics, technical specifications and OEM documentation.
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- Ability to use mechanical testing, measuring and diagnostic equipment.
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- Ability and willingness to work in confined spaces, shafts and tunnels where appropriately trained and authorised.
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- Flexibility to travel interstate and work on project sites for extended periods as required.
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- Ability to pass a pre‐employment medical and meet the physical and safety requirements associated with working on tunnelling equipment and project sites.
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Highly Regarded

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- Experience across multiple sizes and configurations of Herrenknecht AVN microtunnelling machines.
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- Experience undertaking cutterhead maintenance, cutter tool and roller replacement, and modifications to cutterhead or cutter wheel configurations.
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- Experience maintaining and repairing separation plants, slurry pumps, feed pumps, bentonite and grouting systems.
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- Experience undertaking major maintenance, refurbishment or rebuilds of AVN machines and associated equipment.
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- Experience supporting complete TBM project cycles, including mobilisation, launch, breakthrough, recovery and demobilisation.
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- Experience working with AVN machines across varying ground conditions, including hard ground applications.
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- Previous experience supporting major trenchless and microtunnelling infrastructure projects.
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📌 TBM Mechanical Engineering Technician (Victoria)
🏢 Bothar Boring and Tunnelling
📍 Victoria