Why does the pressure washer stutter?
While pulsing in a pressure washer tends to indicate problems in the direction of water pressure, stuttering signals an undersupply of water. This can be due to the supply, the accessories used or a cause within the unit. In many cases it is due to a supply fault, less often to a technical cause.
Stuttering arises from lack
As long as water flows into the high-pressure cleaner in an ideal quantity, is provided with exactly the required volume in the inlet pipe, filter and piston chambers, flows on compressed in a suitable cross-section and is not obstructed by the dispensing gun and nozzle opening, stuttering is impossible.
Stuttering, as distinct from the pulsation of the pressure washer, is rarely a consequence of air in the system. However, there are mixed forms which increasingly indicate a disturbance of the pressure situation, which can also be due to the so-called cavitation.
More on the topic: Pressure Washer Repair
Physical characteristic of cavitation in hot water devices
Cavitation causes the bubbles that form when water boils. At normal atmospheric air pressure, the evaporation point is 100 degrees Celsius. This point increases with water pressure. If the speed of the pressure build-up does not “keep up” with the hot and flowing water, steam bubbles can temporarily form. When the pressure “catches up” with the evaporation point again, the bubbles implode by condensation and water takes their place again. This can lead to a stuttering water flow.
Practical causes that can trigger stuttering
With incoming water
- Water tap fully turned on
- Water pressure in the supply pipe sufficient
Space available for the water
- Cross-section of pipes
- Dirty and clogged nozzle opening
- Dirty or defective valves
For outgoing water
- Gun leaking
- Pressure pipe has too small a cross-section
- Lance has too small a cross-section
- Nozzle cross-section or outlet opening is too small
Also of interest: How to Properly Maintain Your Pressure Washer
Compatibility of the individual parts
The components that are matched to each other also have an influence on the “healthy” flow of water. If all water-carrying appliance parts are from the same manufacturer and designed for the same model, the risk of a lack of space and flow behaviour is minimised. This also applies to supplementary accessories such as foam lances, dirt cutters and other attachments. The material of the inner walls alone can cause stuttering.
| Possible Causes | Solutions |
|---|---|
| Insufficient water supply | Check water source and ensure valve is fully open. |
| Clogged or blocked nozzle | Clean or replace the nozzle. |
| Trapped air in the system | Disconnect water supply, squeeze trigger to release trapped air. |
| Dirty or clogged filters | Clean or replace the filters. |
| Leaks or damage in hoses | Inspect hoses and connections, repair or replace as necessary. |
| Incorrect pressure settings | Adjust pressure to an appropriate level. |
| Lack of regular maintenance | Clean filters, inspect hoses, and perform routine maintenance. |
| Complex internal issues | Seek professional assistance from the manufacturer or technician. |
How to fix a stuttering pressure washer?
If you’re experiencing a stuttering issue with your pressure washer, there are several steps you can take to fix the problem. Here’s a guide on how to address a stuttering pressure washer:
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Check water supply
Ensure that you have a sufficient water supply to the pressure washer. Verify that the water source valve is fully open and that there are no obstructions or kinks in the hose. Insufficient water flow can cause stuttering.
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Inspect and clean the nozzle
A clogged or partially blocked nozzle can disrupt the water flow and lead to stuttering. Remove the nozzle from the lance or wand and clean it thoroughly. If the nozzle is damaged or worn out, consider replacing it with a new one.
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Release trapped air
Trapped air bubbles in the system can cause stuttering. Start by turning off the pressure washer and disconnecting the water supply. Squeeze the trigger on the spray gun to release any trapped air. Reconnect the water supply and restart the pressure washer.
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Check and clean filters
Dirty or clogged filters can restrict water flow and result in stuttering. Check the inlet filter and any other filters in the system. Clean them thoroughly or replace them if necessary.
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Inspect hoses and connections
Examine the hoses and connections for any leaks, blockages, or damage. Tighten loose connections and repair or replace damaged hoses to ensure proper water flow.
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Adjust pressure settings
If the pressure settings are too high, it can cause the pressure washer to stutter. Check the pressure adjustment knob or dial and reduce the pressure to an appropriate level for the task at hand.
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Conduct regular maintenance
Regularly clean and maintain your pressure washer according to the manufacturer’s instructions. This includes cleaning filters, inspecting hoses, and lubricating moving parts.
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Seek professional assistance
If the above steps do not resolve the stuttering issue, it may require professional inspection and repair. Contact the manufacturer’s customer support or a qualified technician for further assistance.
