Pressure Washer Maintenance Guide | Water Blaster Care NZ
Pressure Washer Maintenance Guide: How to Look After Your Water Blaster
A good commercial pressure washer or water blaster is an investment in cleaning productivity. Like any piece of professional equipment, how you operate and maintain it can make a significant difference to its reliability and working life.
Pressure washer maintenance doesn't need to be complicated.
Regularly checking the water supply, hoses, connections, nozzles and other components — and dealing with problems before they become larger ones — can help keep your machine performing as intended.
Just as importantly, operators should follow the maintenance instructions for their particular machine. Different pressure washers have different servicing requirements, so the manufacturer's manual should always take priority over general advice.
In this guide, Hygiene Direct covers the everyday steps businesses can take to help look after a commercial water blaster or pressure washer.
Looking for professional equipment? Explore our Commercial Water Blasters & Pressure Washers.
Why Is Pressure Washer Maintenance Important?
Commercial cleaning equipment can work in demanding environments.
Water blasters may be exposed to:
- Dirt
- Mud
- Dust
- Detergents
- Water
- Outdoor conditions
- Frequent transportation
- Regular commercial use
Small problems can become larger ones when they're ignored.
For example, a damaged hose, blocked nozzle or restricted water supply isn't something an operator should simply work around indefinitely.
Routine inspection helps identify issues early.
For a business, maintenance is also about reducing avoidable downtime.
A pressure washer that's unavailable when you need it can affect cleaning schedules, employees and potentially customers.
Always Start With the Manufacturer's Instructions
This is the most important maintenance recommendation.
Read the operating manual for your particular pressure washer.
General maintenance advice is useful, but it cannot replace the manufacturer's requirements for a specific machine.
The manual should provide information relating to areas such as:
- Operation
- Routine inspection
- Maintenance
- Storage
- Approved accessories
- Water requirements
- Detergent use
- Troubleshooting
- Servicing
If the manufacturer's instructions differ from general advice, follow the manufacturer.
Pressure Washer Maintenance Before Each Use
A quick pre-use inspection can catch obvious problems before the machine starts operating.
Before using your water blaster, check:
High-Pressure Hose
Look for obvious:
- Cuts
- Abrasion
- Kinks
- Bulges
- Damage
- Leaks
High-pressure hoses shouldn't be treated like ordinary garden hoses.
If a high-pressure hose is damaged, don't attempt an improvised repair. Follow the manufacturer's requirements and replace damaged components appropriately.
Connections
Check that connections are secure and in good condition.
Spray Gun and Lance
Look for obvious damage and make sure components connect correctly.
Nozzle
Check that the nozzle is suitable for the cleaning task and appears clean and undamaged.
Power Cable
For electrically powered machines, inspect the cable and plug for visible damage before use.
Water Supply
Make sure the machine has an adequate clean water supply that meets the manufacturer's requirements.
This entire inspection can take very little time.
Make Sure the Water Supply Is Adequate
A commercial pressure washer requires sufficient incoming water.
Don't assume that because water comes out of a tap, the supply is automatically adequate for every pressure washer.
Professional machines can have substantial flow requirements.
For example, different machines within a commercial range may require hundreds of litres of water per hour.
Always check the manufacturer's water-supply requirements.
An inadequate supply may affect performance and could potentially cause problems for the machine.
Check the Water Inlet Filter
Pressure washers commonly incorporate filtration to help prevent debris from entering sensitive components.
If the applicable filter becomes restricted, water supply to the machine may be affected.
Check and clean filters according to the manufacturer's instructions.
This is particularly important where:
- Water quality is variable
- Equipment operates in dirty environments
- Machines move between sites
- Water comes from different supplies
Don't remove filtration simply because it appears to restrict water.
The filter is there for a reason.
Inspect the High-Pressure Hose Regularly
The high-pressure hose is one of the components operators interact with constantly.
It gets:
- Unrolled
- Dragged
- Repositioned
- Rolled up
- Transported
- Stored
That makes regular inspection important.
Look for signs of wear or damage and don't continue operating with a hose you suspect is unsafe.
Also avoid unnecessarily:
- Driving over hoses
- Crushing them
- Dragging them across sharp edges
- Creating severe kinks
- Allowing them to contact damaging surfaces
Good hose management can help protect both the equipment and the operator.
Don't Try to Repair a High-Pressure Hose With Tape
A high-pressure hose operates under very different conditions from an ordinary low-pressure garden hose.
If it's damaged, electrical tape or another improvised patch isn't an appropriate repair.
High-pressure water can cause serious injury.
Take damaged pressure components out of service and have them assessed or replaced appropriately.
Check the Nozzle
A pressure washer nozzle has an important job.
It influences how pressurised water leaves the lance and reaches the surface.
A nozzle that is:
- Blocked
- Damaged
- Incorrect
- Worn
can affect cleaning performance and machine operation.
If the spray pattern changes unexpectedly or performance deteriorates, the nozzle is one of the areas worth checking.
Clean or replace it according to the manufacturer's instructions.
Don't enlarge a nozzle opening or improvise with unsuitable tools.
Look After the Spray Gun and Lance
The spray gun and lance are working components and should be treated accordingly.
Check:
- Connections
- Trigger operation
- Visible damage
- Leaks
- Accessory attachment
If something isn't operating correctly, don't simply compensate by using more force or continuing until it fails completely.
Have the problem investigated.
Check for Water Leaks
A small leak can indicate:
- A loose connection
- Damaged seal
- Worn component
- Damaged hose
- Other equipment issue
Don't simply accept leaks as normal because the machine still operates.
Investigate where the water is coming from and follow the manufacturer's maintenance procedures.
A commercial machine should be maintained rather than operated indefinitely with known faults.
Keep Connections Clean
Dirt entering connections can create unnecessary problems.
When hoses, lances and accessories are disconnected, avoid placing their open ends directly into:
- Mud
- Sand
- Dirt
- Workshop grime
Keeping connections clean reduces the chance of contamination entering the system when components are reassembled.
This is particularly important for machines transported between commercial sites.
Use the Correct Detergent
Some commercial pressure washers provide systems for applying detergent or foam.
Use products appropriate for:
- The pressure washer
- The surface
- The contamination
Follow both the pressure washer manufacturer's and chemical manufacturer's instructions.
Don't assume that any cleaning chemical can simply be poured through a pressure washer.
Incorrect products or concentrations may damage:
- Components
- Seals
- Surfaces being cleaned
They may also create unnecessary safety or environmental issues.
Rinse Detergent Systems When Required
If your machine uses a detergent application system, follow the manufacturer's procedure for cleaning or rinsing that system after use.
Leaving inappropriate chemical residues within equipment may potentially create problems.
Different machines use different detergent systems, so this is another area where the specific operating manual matters.
Don't Ignore Changes in Performance
Operators become familiar with how equipment normally behaves.
Pay attention if you notice:
- Reduced pressure
- Irregular pressure
- Unusual vibration
- Unexpected noises
- Leaks
- Changed spray pattern
- Loss of water flow
- Electrical problems
- Difficulty starting
- Unexpected stopping
These can be indications that something needs attention.
Continuing to operate malfunctioning equipment can potentially turn a smaller problem into a larger one.
What Causes a Pressure Washer to Lose Pressure?
There are numerous possibilities, so don't immediately assume the pump has failed.
Depending on the machine, causes could potentially involve areas such as:
- Inadequate water supply
- Restricted inlet filter
- Nozzle problems
- Air entering the system
- Hose or connection issues
- Worn components
- Pump-related problems
Start with the straightforward checks permitted by the manufacturer's troubleshooting instructions.
If the problem isn't resolved, have the equipment professionally assessed.
Why Is My Pressure Washer Pulsing?
Pressure that repeatedly rises and falls can have several possible causes.
These may relate to:
- Water supply
- Restrictions
- Air
- Nozzle
- Connections
- Internal components
Again, avoid diagnosing a commercial machine purely from an internet checklist.
Use the manufacturer's troubleshooting procedure for the specific model.
If you're unable to identify the issue safely, arrange professional servicing.
Keep the Machine Clean
It sounds obvious, but cleaning equipment needs cleaning too.
After operating in muddy or dirty environments, remove external contamination appropriately.
Pay particular attention to areas where dirt could:
- Block ventilation
- Interfere with controls
- Accumulate around connections
- Hide damage
Don't attack the pressure washer itself indiscriminately with its own high-pressure jet.
Follow the manufacturer's cleaning instructions.
Coil and Store the Hose Properly
Don't simply throw a high-pressure hose into a pile when the job is finished.
Where the machine has a hose reel, use it appropriately.
Otherwise, store the hose in a way that avoids:
- Severe kinks
- Crushing
- Sharp bends
- Contact with damaging materials
Good hose storage also means the machine is ready to use efficiently on the next job.
Store Accessories Properly
Nozzles, lances, spray guns and other accessories should be stored so they're:
- Clean
- Protected
- Easy to locate
- Less likely to be damaged
Professional machines may include onboard storage for accessories.
Use it.
Losing a nozzle or damaging a lance because it was thrown loose into the back of a van is an avoidable expense.
Pressure Washer Storage
When the machine isn't being used, store it according to the manufacturer's requirements.
A suitable storage area should generally protect equipment from unnecessary:
- Weather exposure
- Dirt
- Physical damage
- Interference
Commercial users should also consider security.
Professional cleaning equipment can represent a significant investment.
Protect Your Pressure Washer From Frost
This is particularly important in colder parts of New Zealand.
Water left inside a pressure washer can freeze.
When water freezes, it expands, potentially damaging components.
If equipment may be exposed to freezing conditions, follow the manufacturer's specific procedure for cold-weather storage and frost protection.
Don't wait until after a freezing night to think about it.
This can be especially relevant for equipment:
- Stored in unheated buildings
- Left in vehicles
- Used in colder regions
- Stored at altitude
Don't Leave a Water Blaster Sitting Outside
Commercial equipment is designed to work, but that doesn't mean it benefits from unnecessary exposure to the weather.
If possible, store pressure washers appropriately between jobs rather than permanently leaving them exposed to:
- Rain
- Sun
- Frost
- Dirt
Correct storage is one of the simplest forms of equipment care.
Electrical Pressure Washer Maintenance
For electric machines, regularly inspect:
- Power lead
- Plug
- Visible electrical components
Don't operate equipment with obvious electrical damage.
Water and electricity require particular care.
Follow the manufacturer's electrical safety instructions and applicable workplace requirements.
Electrical repairs should be performed by appropriately qualified people.
Hot-Water Pressure Washer Maintenance
Hot-water machines add another layer of equipment compared with cold-water pressure washers because they incorporate a heating system.
Depending on the machine, additional maintenance may relate to components associated with:
- Burner
- Fuel
- Heating coil
- Temperature controls
- Scale
- Exhaust
This makes following the manufacturer's servicing schedule particularly important.
A hot-water pressure washer shouldn't simply be treated as a cold-water machine that happens to get hot.
Hard Water and Scale
Water quality can affect cleaning equipment.
In areas with mineral-rich water, scale may potentially build up within applicable systems, particularly where water is heated.
Follow the manufacturer's recommendations regarding water quality, descaling and maintenance.
Don't introduce descaling chemicals into equipment unless they are appropriate for the machine and procedure.
How Often Should a Pressure Washer Be Serviced?
There isn't one universal service interval for every pressure washer.
The appropriate schedule depends on:
- Manufacturer
- Model
- Hours of use
- Operating environment
- Application
- Maintenance requirements
A machine operating every day in a demanding commercial environment may require a very different servicing regime from one used occasionally.
Follow the manufacturer's service schedule for your particular model.
For commercial users, it can also make sense to base maintenance on operating hours rather than simply calendar time where the manufacturer specifies this.
Keep a Maintenance Record
For businesses with multiple pieces of cleaning equipment, a simple maintenance record can be extremely useful.
Record information such as:
- Machine
- Serial number
- Purchase date
- Service dates
- Operating hours where applicable
- Repairs
- Parts replaced
- Reported faults
- Next scheduled service
This helps prevent maintenance from becoming:
“I'm sure somebody serviced that recently.”
It can also help identify recurring equipment problems.
Train Your Operators
One of the best ways to look after a commercial water blaster is to make sure the people using it know how.
Operators should understand:
- Pre-use checks
- Correct startup
- Correct shutdown
- Hose handling
- Nozzle selection
- Detergent use
- Storage
- How to recognise a fault
- When to stop using the machine
A maintenance programme isn't very effective if the equipment is being misused every day.
Don't Ignore Operator Feedback
If an employee says:
“This machine doesn't sound right.”
don't automatically dismiss it because the pressure washer still operates.
The person regularly using the equipment may notice subtle changes before somebody else does.
Encourage operators to report:
- Leaks
- Damage
- Unusual noises
- Pressure changes
- Electrical issues
- Hose wear
- Accessory problems
Then investigate them.
Daily Pressure Washer Maintenance Checklist
Before use:
✓ Inspect high-pressure hose
✓ Check gun and lance
✓ Check nozzle
✓ Inspect connections
✓ Check water supply
✓ Check inlet filter where applicable
✓ Inspect electrical lead and plug on electric machines
✓ Look for obvious leaks or damage
After use:
✓ Follow correct shutdown procedure
✓ Deal with detergent system as instructed
✓ Inspect equipment for damage
✓ Coil/store hose correctly
✓ Store accessories
✓ Clean external contamination where required
✓ Store machine appropriately
This doesn't replace the manufacturer's maintenance schedule, but it provides a useful everyday routine.
Commercial Pressure Washer Preventive Maintenance
For a business, preventive maintenance is generally preferable to waiting for equipment to fail.
Think of maintenance in three levels:
Operator Checks
Simple routine inspection before and after use.
Scheduled Maintenance
Tasks specified by the manufacturer at appropriate intervals.
Professional Servicing
Inspection, maintenance and repair requiring appropriate technical expertise.
The objective is to identify deterioration before it results in:
breakdown + downtime + urgent repair + disrupted cleaning work.
Should I Service or Replace My Pressure Washer?
Eventually, every piece of equipment reaches a point where businesses need to consider whether further repairs make economic sense.
Consider:
- Age
- Condition
- Repair cost
- Frequency of breakdowns
- Parts availability
- Current cleaning requirements
- Productivity
- Replacement cost
A machine shouldn't automatically be replaced because it requires a repair.
Equally, repeatedly spending money on equipment that no longer meets the business's requirements may not be economical.
Look at total operating value, not simply the cost of the latest repair.
Choosing a Commercial Pressure Washer That's Easy to Live With
Maintenance should actually be considered before you buy the machine.
Ask:
- Is it professional equipment?
- Is it suitable for our expected workload?
- Can it be serviced?
- Are replacement parts available?
- Are hoses and accessories readily available?
- Is it straightforward for staff to use?
- Is storage practical?
- Can we get support when something goes wrong?
This is one of the reasons buying commercial equipment should involve more than comparing PSI and price.
Read our:
How to Choose a Commercial Water Blaster: NZ Buying Guide
Maintaining Nilfisk Water Blasters
Hygiene Direct supplies Nilfisk professional water blasters and pressure washers for commercial cleaning applications.
Individual Nilfisk models have their own maintenance and servicing requirements, so always refer to the operating manual for the particular machine.
If you're currently choosing equipment, explore:
Commercial Water Blasters & Pressure Washers
Pressure Washer Maintenance: The Simple Rule
The best maintenance strategy is surprisingly straightforward:
Inspect it.
Operate it correctly.
Keep it clean.
Store it properly.
Follow the manufacturer's maintenance schedule.
Deal with faults rather than ignoring them.
Have appropriate servicing carried out when required.
A commercial water blaster is a working asset. Looking after it helps protect the investment and reduces the chance of preventable downtime.
For help selecting professional pressure-washing equipment, contact your local Hygiene Direct branch.
He Waka Eke Noa – We Are All in This Canoe Together.
Frequently Asked Questions
How often should I service my pressure washer?
Follow the service interval specified by the manufacturer for your particular model. Requirements can vary according to equipment, operating hours and working conditions.
Why has my pressure washer lost pressure?
Possible causes can include water-supply problems, restrictions, nozzle issues, connections or internal components. Follow the manufacturer's troubleshooting instructions before assuming the pump has failed.
Should I clean the pressure washer nozzle?
The nozzle should be inspected and maintained according to the manufacturer's instructions. A blocked or damaged nozzle can affect machine performance.
Can I repair a pressure washer hose with tape?
A damaged high-pressure hose shouldn't be repaired using improvised methods such as tape. Take damaged high-pressure components out of service and have them replaced or repaired appropriately.
Should I leave water in my pressure washer?
Follow the manufacturer's shutdown and storage instructions. This is particularly important where the machine could be exposed to freezing temperatures.
Can frost damage a water blaster?
Potentially, yes. Water can expand when it freezes and may damage equipment. Follow the manufacturer's frost-protection procedure if the machine may experience freezing conditions.
Why does my pressure washer pulse?
Pulsing can potentially be caused by water-supply, restriction, nozzle, connection or internal equipment issues. Check the manufacturer's troubleshooting procedure for your model.
Can I use any detergent in a pressure washer?
No. Use cleaning products appropriate for the machine, surface and application and follow both the pressure washer and chemical manufacturers' instructions.
Where can I buy a commercial pressure washer in NZ?
Hygiene Direct supplies commercial water blasters and Nilfisk pressure washers throughout New Zealand.
Related Water Blaster & Pressure Washer Guides
- How to Choose a Commercial Water Blaster: NZ Buying Guide
- Water Blaster vs Pressure Washer: Is There a Difference?
- Hot vs Cold Water Pressure Washers: Which Do You Need?
- What PSI Water Blaster Do I Need?
- Commercial vs Domestic Water Blasters
- How Much Water Does a Pressure Washer Use?
- Best Water Blaster for Commercial Cleaning
- How to Clean Concrete With a Water Blaster
- Nilfisk Water Blasters: Choosing the Right Model