Pressure washers are powerful cleaning tools that use pressurized water to remove dirt, mold, mildew, and other debris from surfaces like concrete, siding, decks, driveways, vehicles, and equipment. They contain a motor, pump, hose, and trigger gun that allows the user to spray pressurized water out of the nozzle.
The pump in a pressure washer plays a critical role in developing the high water pressure needed for effective cleaning. This pump pressurizes the flow of water that travels through the hose to the trigger gun. Proper maintenance and care of the pump, including regular oil changes, are essential for the pressure washer to function properly over time.
So do you need to change the oil in a pressure washer pump? The short answer is yes, regular oil changes are recommended for proper operation and to extend the life of the pump. Let’s take a closer look at why changing the oil is necessary.
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Reasons to change pressure washer pump oil
There are a few key reasons why experts recommend changing the oil in pressure washer pumps on a regular basis:
1. Prevent wear and damage
The constant high-pressure operation in a pressure washer pump causes a lot of internal wear and tear over time. Small metal shavings and debris can circulate through the pump housing and contaminate the oil. Changing the oil regularly helps flush out these contaminants before they can damage internal components. Fresh oil will keep parts properly lubricated and prevent premature wear.
2. Remove moisture buildup
When using a pressure washer, moisture tends to mix with the oil over time. Water seeping past seals or condensation building up inside the pump housing can contaminate and degrade the oil. Draining old oil removes this moisture buildup. Adding new oil helps protect parts from rust and corrosion.
3. Extend pump life
Routine oil changes every 50 hours or so can dramatically extend the operating life of a pressure washer pump. The fresh oil and filter changes prevent contaminant buildup that would otherwise wear down components. Well-maintained pumps can last for many years of use.
4. Maintain performance
Over time, contaminated oil will start to break down and lose its lubricating properties. This can reduce pump performance and pressure output. Changing the oil and filter restores optimal viscosity and lubrication for peak internal functioning.
How often to change pressure washer pump oil
Most pressure washer manufacturer manuals recommend changing the pump oil after an initial break-in period of 20-50 hours, then every 50 hours of use after that. Here are some general oil change frequency guidelines to follow:
After first 20-50 hours
An initial oil change after the first 20-50 hours of operation can remove any small shavings or debris from the break-in period. This initial change clears out contamination before it can build up.
Every 50 hours of use
Changing oil every 50 hours is recommended for regular pressure washer maintenance. This interval prevents excessive buildup of contaminants while the oil is still within good operating condition.
Every 3 months
If a pressure washer is only used occasionally, change the oil at least every 3 months. The months between uses allows moisture condensation and varnish buildup that degrades the oil over time.
After long-term storage
If a pressure washer sits unused for more than a few months, old oil and contaminants can settle and gel in the pump. Always drain and fill with fresh oil after long-term storage or seasonal shutdown.
When oil is dirty
Check the oil periodically before it reaches the 50-hour mark. If it appears very dirty or contaminated sooner, go ahead and change it. Don’t wait until the scheduled interval if the oil is already degraded.
How to change pressure washer pump oil
Changing pressure washer pump oil is usually a quick and simple maintenance task. Here are some step-by-step instructions for properly draining old oil and adding new:
Materials needed
- Oil drain pan
- Funnel
- Proper pressure washer oil
- Oil filter (if equipped)
Steps
- Run pressure washer for 5 minutes to warm oil
- Locate oil drain plug underneath pump
- Place drain pan underneath to catch old oil
- Remove drain plug and allow oil to fully drain out
- Replace oil drain plug
- Locate oil fill port on pump housing
- Add new oil through fill port using funnel
- Replace oil filter if your model has one
- Dispose of old oil properly
Always refer to your owner’s manual for the exact oil change steps, oil capacity, and recommended oil viscosity for your particular pressure washer model.
Tips for changing pressure washer pump oil
Follow these tips when servicing your pressure washer pump oil:
– Use properly rated pressure washer oil only. Regular engine oils are too light for this application.
– Check oil levels often between changes. Top off if low to prevent damage.
– Take care not to overfill the pump housing with oil.
– Make sure the drain plug, fill port, and filter are all tightly sealed when done.
– Label the next oil change date on the pressure washer.
– Dispose of used oil properly at approved recycling centers.
– Inspect oil for metal debris that may indicate internal pump wear.
Signs you need an oil change
Watch for these signs that it’s time to drain and fill the oil in your pressure washer pump:
Decreased pressure
Diminished cleaning power is a clue that oil is ready for a change. Contaminants in old oil reduce lubrication, resulting in lower pressure output.
Dirty/cloudy oil
Internal debris makes oil appear dirty. Cloudiness indicates moisture buildup and oxidation. Change cloudy oil right away.
Leaking oil
Look for external oil leaks near gaskets, seals, plugs, hoses, and the fill port. Leaks mean it’s time to replace old seals and O-rings.
Pump noise
Extra noise from the pump often stems from inadequate lubrication. Fresh oil will quiet abnormal rattling or grinding.
Reaching 50 hours
Don’t exceed recommended 50-hour oil change intervals, even if nothing seems wrong. Sticking to schedules prevents premature wear.
DIY or professional service?
For most homeowners, changing their own pressure washer pump oil is usually perfectly feasible. It only requires basic tools and mechanical ability to complete. However, those who are unsure of their DIY skills may prefer hiring a professional service technician for oil changes and other pressure washer maintenance.
Pros of DIY:
- Saves money on labor costs
- Convenient to do at home
- Good option for mechanically inclined
Pros of professional service:
- Experts handle all complex steps
- Technicians can diagnose other issues
- Allows focus on using, not maintaining
Evaluate your own ability and willingness to take on maintenance tasks. Opt for professional service if changing your own oil seems daunting.
Conclusion
Regular oil changes are critical for proper functioning and longevity of pressure washer pumps. Contaminated oil can quickly damage pump components through lack of lubrication, moisture corrosion, and excessive wear debris circulating inside the housing. Follow the manufacturer’s recommendations for oil change frequency, typically every 20-50 hours of use. Changing oil removes built up contaminants and provides vital protection for the pump’s internal mechanisms. Make oil changes a priority to get the best performance and life from your pressure washer investment.