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A first class mobile + workshop
heavy equipment repair service

If it moves or floats we’ll fix it!
Known for the highest quality heavy equipment repair service in the region and going the extra mile for our diverse range of clients, we have the expertise to fix or service your heavy machinery out in the field, or in our specialised workshop.

Our team is highly experienced and ready to repair, maintain or service your light/heavy plant and equipment. We’ll have you back up and running as soon as possible.

Our Services

We can tend to all of your heavy machinery repair and servicing needs with our team of field service technicians and workshop facilities. We work hard to honour our ‘do it once, do it right’ philosophy to get you moving again swiftly and to ensure you have minimum downtime with your equipment. We are specialists in:

Customer first service

We pride ourselves on providing what you need in the timeframe you require

On site servicing & repair of all heavy equipment

We come to you, nowhere is too remote or too challenging

Breakdown Service

24 hour 7 day a week breakdown service

Scheduled maintenance

Regular servicing of all makes and models of machinery


Diagnostic fault finding and hydraulic component rebuilds


We have Diagnostic equipment for on-board monitoring systems

Air conditioning

Servicing and repairs of all heavy equipment and light vehicle air conditioning systems

Marine propulsion

Regular servicing and repairs of all makes and models of marine engines and transmissions


Full mobile and workshop based engineering services. Heavy and light fabrication, maintenance and repairs

Component rebuild service

Engine, hydraulic and powertrain component rebuilds

Truck servicing

Servicing and repairs of all trucks makes and models

Equipment safety compliance inspections

Inspections can be tailored to your company or site requirements


Diagnostic fault finding and repairs

Mobile crane servicing and repairs

Pre-certification inspections, servicing and repairs of all makes and models

Car / Ute servicing and repairs

Servicing and repairs of all car /ute makes and models

General wizardry

Whatever the problem we will find the solution

   Click here to see our full Ship Repairers Standard Terms and Conditions.

Service area and hours

24/7 Call out service
Workshop hours 7am - 6pm weekdays, on call weekends

Servicing the top of the South Island, Blenheim, Nelson and Marlborough.

As an Authorised Stockist we solely use and recommend Valvoline


About us

On Site Mechanical Repairs Ltd was formed to fill a shortfall of first class professional heavy equipment repair service in the Marlborough region and beyond.

Ben McMaster and Aaron Parish launched the business in 2017 with a combined 36 years of industry experience. Providing a professional service through technical solutions, expert advice and a proven track record of going the extra mile to ensure our customers succeed. The team’s mantra is “Do it once. Do it right!”

We aim to be the heavy plant and machinery repairer of choice in the Marlborough region, whilst ensuring our staff and customer’s safety is at the forefront of everything we do.

Our Team

Do it once, do it right is the mantra for our highly technical, experienced, hardworking and dedicated team.

Aaron Parish
Ben McMaster
Steven Asplet
Field Service Supervisor
Clinton Lochhead
Workshop Supervisor
Shane Bradley
Marine Technician
John Van-Dyk
Diesel Mechanic
Samuel Luckman
Diesel Mechanic
Craig Hampton
Jacob Lawton
Apprentice Mechanic
Vincent Hodgson
Truck Mechanic
Daniel Crossan
Parts Interpreter
Damon Zillwood
Apprentice Mechanic
Jason Weir
Letitia Parish

Client testimonials

We have been using On Site Mechanical Repairs to maintain our gear since Ben & Aaron created the business, they are extremely skilled mechanics and diagnosticians, they are honest, reliable and live by their motto “do it once, do it right”. Highly recommended.

Greg & Carol Robinson, Elite Excavations Marlborough

Contact us

Contact Us

Office: 03 5777309

Parts: 0274555707

After hours call out: 0274555719

Workshop Supervisor: 0273229355

Field Service Supervisor: 0275003177

Enquires to

Workshop located at:
121 Mahers Road
Renwick  7273
Workshop: 03 577 7309

Servicing the top of the South Island, Nelson and Marlborough.

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