Over time we get to understand just how important regular maintenance on our equipment is when it breaks down on the jobs. When your machine is struggling to start and you've got a packed our week of work is usually when the machine starts to cause issues. So in this article I'll go through some of the most common questions when it comes to servicing your Honda GX390 pressure washers so you're equipped with everything you need to know about keeping your machine in top shape so you don't have to loose time and money in the future like we have.

So there are 3 keys parts of pressure washer servicing:

• Firstly a Honda Gx390 engine Service
• Interpump 21Lpm gearbox and pump service
• Interpump 21LPM system check.

How often should you service your Honda Gx390 Engine?

Regular servicing is essential for maintaining the performance and lifespan of your pressure washer. Without regular servicing, small problems can quickly escalate into larger issues, resulting in reduced efficiency and increased downtime.

The first Service needs to be completed after the first 20 hours of use.

Then regularly serviced after every 100 hours or 1 year, whichever comes first

You might be asking, What parts are included with a Honda Gx390 engine service?

The Honda Gx390 has an engine capacity of 1.1L so this is the amount of engine oil that is required. As part of the service the air filter is replace along with the spark plug.

How often should the pressure washer pump and gear box be serviced?

The Gear box and Pump oil should be changed after the first 50 hours

Then the oil should be changed after every 500 hours there after.



The oil is possibly the most important element of servicing most heavy equipment, but this is not to make any other parts of maintenance any less important.

Considering the oil is changed in line with the plan above.

After every 1000 hours, which should be reduced if the machine is under harsh operating conditions such as continuous use the servicing intervals should be more frequent. The Valve assemblies and pump seals should be checked or replaced.

The reactive response to maintenance is more of an amateur response to maintenance which often means you’ll be fixing problems live on a JOB! Just when you should be earning money.

Fixing problem after they’ve occurred is reactive maintenance which can result in increased costs and reduced efficiency… Less profits. 

By investing in preventative maintenance, you can extend the lifespan of your pressure washer, avoid costly repairs, keep your schedule on track and ultimately keep your customers happy.

How Much Does a Pressure Washing Service Cost?

The cost of a pressure washing service can vary based on a number of factors, including the type of pressure washer. 

The main components in a pressure washing service are: 

- Engine Oil

- Gear Box Oil

- Air Filter

- Spark Plug Replacement

- Disposal products.

Different size machines require larger or small quantities of oils. 

Considering their are 2 different types of service a DIY : 

Honda GX390 Engine Service kit £70

Interpump Gearbox and Pump Oil Kit : £40

Seal pump check, free providing there are no parts or seals to be replaced.

For a professional to complete a pressure washing service on your machine, expect to pay between £120 for an engine only service and roughly £160 for a full oil service including the gearbox and pump oil change.

With a high quality machine, with name brands like Honda and pumps buy the Italian manufacturer Interpump with regular servicing its not uncommon for these machines to last OVER 10 years!

How Long Does a Pressure Washing Service Take?

Between 20 - 60 minutes depending on your experience level and equipment you have on hand.

Van mounted systems can take a little bit longer than a trolley mounted machine IF they have been are poorly designed. Our Van mounted systems are made for easy maintenance, with everything easily accessible so you can service your machine yourself - putting the power back in your hands.

On average, a pressure washing service can take anywhere from 20 minutes to a few hours, depending on the factors mentioned above. 

How to Find the right service kit for your pressure washer?

A service kit is a collection of parts that are needed to complete routine maintenance on your pressure washer. The right service kit will depend on the make and model of your pressure washer, as well as the type of maintenance you need to perform. 

To find the right service kit for your pressure washer, start by checking the manufacturer's website for a list of compatible parts. Alternatively, you can contact the supplier where you bought your machine and they should be able to provide you with all the information necessary for servicing your machine

When you buy a Van Mounted Pressure Washing System from us, All our equipment comes with fault finding videos and documentation letting you know the exact parts and how to undertake essential maintenance yourself.

This gives the knowledge back to you and give you more independence inside your business.

If you have machine from us. Please find the correct service kits, oils and parts below to complete your own serving.

For guide on how to fault find and complete the servicing yourself, visit our Troubleshooting page to learn how to complete the service and diagnose any issues you may be facing with your machine

I hope your found this guide useful, and this is my thoughts on pressure washing servicing