When the same water is cycled through the pump, it gets warmer as the crankcase generates heat. Overheating happens when the pump is in bypass mode for too long. However, you should not test its limits for too long. The unloader valve protects the pump with its bypass mechanism. This cycle continues until the water is released. The pressurized water is depressurized in the bypass inlet and is again fed to the pump. The unloader valve diverts the water flow in a loop to the inlet. This is because when you do not squeeze the trigger for some time, the unloader valve, also known as the thermal release valve, activates. Unrelieved pressure does not damage the pump. When you stop squeezing the trigger, the pressure built by the pump does not relieve, and pressure continuously builds inside the pump. The pressure washer pump builds pressure even when you are not spraying. However, its consequences are less severe than vaporization. Air ingestion can also cause damage to the pump of the washer. Another cause of cavitation is air ingestion. It occurs due to the high temperature of the water inside the pump. Vaporization is another cause of cavitation in the pressure washer pump. The water supply flow should always match the Gallons Per Minute (GPM) rating of the pressure washer. The most common reason for cavity formation is insufficient water supply. Cavitation can even cause a small explosion that damage the pump.Ĭavities are formed for different reasons. The cavities leave low-pressure areas and pass into a high-pressure area. The pressure washer becomes noisier and vibrates more when the water inside the water supply becomes saturated with air cavities. Air cavities, or air bubbles, form inside the water supply and can cause a loss in capacity and water pressure and a drop in efficiency. One of the more common problems that occur because of low water supply pressure is cavitation. A faulty unloader valve, cavitation, and water overheating can be some other big reasons behind pressure washer pump failure. The reason for pressure washer pump failure is not always natural wear and tear. The life expectancy of all pressure washer pumps is pre-defined. Once you have tested and found the root of the problem, use the table to fix the problem.Ĭhange the nozzle and make sure that you use the correct one. The table below will help to diagnose and analyze which part of the pump is causing the problem. Different types of problems arise because of the failure of different parts in the pump. Use the pump problem indicators to diagnose the issue. To troubleshoot or test a pressure washer pump, turn on the pressure washer. To restore the machine’s pressure, clean the filters and remove the dirt and debris that prevent the adequate supply of water to the pump. If the seal is fine, low pressure can be due to dirt blockage. To fix the issue, replace the worn O-ring. Or a rubber gasket that seals the inside of the pistons and valve. Low pressure is due to a worn-out O-ring. Faulty Pump indicator: Low output pressureĪ pressure washer not producing enough pressure also indicates a fault in the pump. If this is not the cause, there can be a blockage in the pump, or a leak from the cylinder head can also cause the pressure to pulse. Remove the inlet filter and clean any blockages. In the case of an electric pressure washer, this results in the motor restarts. The main reason for the output pressure to pulse is an insufficient inlet water supply. Faulty Pump indicator: Pulsating output pressure Water coming from the hose will run through the pump and indicate the area from which the leak is originating. Do not turn on the motor or engine with its case removed. To identify leaks, remove the case of the pressure washer and turn the water on. Else it will expand and damage the plastic parts. Before the winter hits, you need to drain all water in the pump. A leaking cylinder head or inlet/outlet elbow is often caused by frozen water inside the pump. Replace the old gasket with a new one to fix the leak. A leaking indicates a worn O-ring or gasket. Leaks are often caused by a damaged or worn seal. Leaks are probably the most common problems associated with pressure washer pumps. Here are the most common pressure washer pump failure indicators: 1. 4 Is a pressure washer pump protector necessary?.3 Why does the pressure washer pump fail?.2 How do you test a pressure washer pump?.Faulty Pump indicator: Low output pressure
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