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Based in Wellington - servicing from Taupo to Christchurch   |  
For all your generator hire & maintenance | Buy new & used generators | Available 24/7

Wellington based Diesel Agencies offers expert generator maintenance services

  • Our highly-skilled technicians are available 24/7
  • A servicing monitoring system, including fault notifications
  • NZS 6104:1981 and HASWA (HSNO) compliance services
Our generator servicing and maintenance team cover from the Central North Island to the top of the South Island

Equipped with the latest technologies to service your standby generator



Keeping your business running with stable power sources is what we do best. With over 30 years in the diesel generator industry, we have the expertise to handle everything, including diagnostic testing. We use the latest technology and Woodward diesel systems to preserve optimum performance by completing thorough generator servicing, maintenance and repairs. In addition, we keep a full-service history of your equipment and operate a servicing monitoring system that flags any issues.

Whether experiencing a single point of failure caused your standby generator to stop or you just need an annual service, we have you covered. There's no need to worry about meeting NZS 6104:1981 Emergency Electricity Supply regulations, we can help there too. Our team of qualified technicians is available 24/7 and provides professional service. Wellington-based, our work sees us travel around the Central North Island down to the top of the South Island.

Call today for urgent diesel generator repairs, regular maintenance or technical support.


Avoid costly downtime - maintain your generator with professional servicing by Diesel Agencies

Regular servicing of your diesel generator is paramount to minimise the risk of unexpected breakdowns and disruptions to your business. Proper servicing by experienced professionals at Generator Central enhances the durability of your equipment, extends its lifespan, and reduces the likelihood of major repairs. Cheaper than a new diesel generator, maintaining your machines also has other benefits, including improved fuel efficiency, compliance and preventing wet stacking.

Routine maintenance tasks include checking fluid levels, inspecting components, and replacing filters and oils or engine starter batteries as required. These preventative measures save you money in the long run. Ultimately, you get peace of mind, knowing your generator is well-maintained and ready to provide reliable power whenever required.

And remember, if disaster strikes, we offer generators to hire. To book, call our Wellington team today.


Getting to the bottom of your power supply issues with diagnostic testing


At Diesel Agencies , we offer diagnostic testing and in-depth analysis to pinpoint problems and schedule targeted repairs or adjustments to restore the generator's optimal performance. 

Call today if you are having problems with your diesel generator. Our team will quickly get to the root cause and have it back up and running quickly. If it's beyond repair, we have a range of affordable, well-maintained new and second-hand generators for sale or generator rentals.

Our diagnostic testing includes the below:



Performance Testing:
To confirm an acceptable range, we measure parameters such as voltage output, frequency, and load response.
 Fuel System Analysis:
This involves inspecting and testing filters, pumps, and injectors for proper fuel flow, pressure, and combustion efficiency.
Electrical System Testing:
Apart from a mains fail simulation, we test parts, including wiring, relays, control panels, and sensors.
Compression Testing:
We measure the engine cylinders' compression pressure to assess the combustion process's condition and efficiency.
Oil and Coolant Analysis:
Samples are collected and analysed to check for contamination, excessive wear, or signs of internal engine problems.
Load Bank Testing:
Simulating a load using a load bank to assess its performance under realistic operating conditions to verify its capacity and stability.
Diagnostic Software:
 Using specialised diagnostic software, we connect to your generator's control system and retrieve error codes and historical data.
Data Logging:
 Our servicing monitoring system records and analyses the generator's performance to identify intermittent or recurring issues.

Protect your engine and boost efficiency with our diesel fuel polisher


At Diesel Agencies , we recommend a filtration protocol when your fuel is stored for long periods or in remote locations where fuel quality may deteriorate over time. Using a diesel fuel polisher helps optimise the performance and reliability of diesel engines, leading to smoother operation, improved fuel economy, less engine damage and reduced maintenance costs. In addition, by removing contaminants such as water, sludge, sediment, and microbial growth, you’ll boost engine efficiency with cleaner fuel.

Refuelling and certifying diesel generator fuel tanks just got easier with Diesel Agencies


Health and Safety at Work Act (HASWA) - Hazardous Substances and New Organisms Act (HSNO) - SS14/1 for Emergency Power Systems


IQP-certified, we provide refuelling and compliance services for customers with permanent fuel tanks. As you know, in line with regulations, you must have a Stationary Container Certificate for diesel fuel tanks with a volume exceeding 500 litres. So, in addition to topping up your fuel supplies to keep your generator running, we can complete your three-yearly inspections too.

For customers with emergency power systems (standby diesel generators), your SS14/1 compliance is also under control. Call today to get your equipment up to spec and get that tick of approval.

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